6.Sum of Electrical Power Physics Class 10

Three sum of electrical power have been discussed. Here. These sum will give a basic idea of finding electrical power and electrical energy consumed by a load or electrical energy supplied by a source like battery.
The sums are:

1. Two resisters of value 6 ohm and 12 ohms are connected in series across a battery of 12 volt. Draw the circuit diagram and calculate.
a) Current flowing through each resistor.
b) The electrical energy consumed by each resistor.

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+ Sollution - Close the Sollution

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2. These two resistors again connected in parallel and the above data are again calculated.

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+ Sollution - Close the Sollution

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3. Two bulb L1 and L2 of rating 100 W 200 V and 10 W 200 Volt respectively are connected across a supply of 200 V in series. Find
a) Current flowing through each bulb
b) which bulb will consume more power.

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5. Law of Refraction Of Light Physics Class 10

There are two laws of refraction of light. these are :
a) Incident say , refracted ray and normal lie on same plane .
The concept of plane is shown in the image. In terms of x,y and z co-ordinate system , the y-z plane is shown in light sky blue colour.

We write on our copy which is considered x-y plane. The image is given just for understanding of plane concept. It is not needed while writing the law. Try to image other planes in the image.
b) Ratio of sin of angle of incidence and sine of angle of refraction remains constant for a pair of media. i.e.

sin i / sin r = constant (n)
this constant is called refractive index of medium 2 with respect to medium 1.
or we can write
n₂ / n ₁ = sin i / sin r
Where n ₁ is the refractive index of first medium here air. And n₂ is the refractive index of second medium here glass.
∴ n₂ = n₁ x ( sin i / sin r )

If you have any query regarding the laws of refraction then comment below.

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4. Effects of Refraction of Light Physics Class 10

There are many effects of the refraction of life in our day to day life. For example I am citing few of them.
a) The partly immersed stick appear to be bend at the surface of the water.
b) The coin kept in water appears raised upward.
c)The water of a pool appear less depth.
d)Stars appear to twinkle in the sky when the sky remains clear.
e)A lemon immersed in water appears to be bigger in size.
All these are discussed in the above video. If you have any confusion then comment below.

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3 Three Cases of Refraction of Light Physics Class 10

Case1: When ray of light travels from rarer medium like air to a denser medium like glass then it bends towards normal.

Case 2: When ray of light travels from denser medium like glass to a rarer medium like air then it bends away from the normal.

Case 3: When ray of light travels from rarer medium like air to a denser medium like glass and again emerges to the previous rarer medium then it suffers a lateral displacement as shown in the figure.

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Keeping Pressure On children for Achieving high Ambition is Right or Wrong उच्चे लक्ष्य को पाने के लिए माता पिता द्वारा बच्चों पर डाला जाने वाला दबाव उचित है या अनुचित है।

लक्ष्य की उंचाई सफलता को गति और उर्जा प्रदान करती है। परन्तु ऐसा लक्ष्य जो किसी बच्चे की क्षमता से अत्यधिक है । वह बच्चे को मानसिक रोगी या पागल बनाता है । और कभी कभी बच्चे आत्महत्या का शिकार हो जाते हैं। इसलिए मेरा मानना है कि इस तरह का दबाव अनुचित है। जब जीवन ही नहीं रहेगा तो जीवन में लक्ष्य का कोई मतलब नहीं है।

जब लक्ष्य बच्चे की क्षमता की परिधि के बाहर होता है , तो वह लक्ष्य उसके लिए बोझ बन जाता है । चुंकि बच्चे अपने माता पिता को खुश देखना चाहते हैं, इसलिए वे झूठ बोलने लगते हैं। जैसे मैने याद कर लिया, होमवर्क कर लिया , मै नकल नहीं करता हूं , मै 90% से जादा अंक प्राप्त करूंगा इत्यादि। इस दबाव में वे अपने अन्दर छुपी मेधा को पररव नहीं पाते । और माता पिता के सोंच के ढांचे में फंस जाते हैं। और नौकरी की खोज में दर दर भटकते रहते हैं। आज के इस प्रतिस्पर्धा के कारण दूसरेआम बच्चे थोड़ा तकनीकी सीखकर रोजी रोटी की दौड़ में इस बच्चे से आगे निकल जाते हैं। और सबसे बड़ी बात यह है कि वे निम्न और कमजोर मानसिकता के शिकार नहीं बनते। मेरे अनुसार ऊंचे लक्ष्य को अपने बच्चे की क्षमता के अनुसार निश्चित करना चाहिए और दबाव न डालकर बच्चों की सहायता करनी चाहिए। उनसे कनेक्ट होना चाहिए। यही मन्त्र उनके जीवन को सफल बना सकता है।

माता पिता को मानसिक दबाव न देकर बच्चे से उसके समस्याओं के बारे में बात करने का प्रयास करना चाहिए । ताकि वह समझ सके कि आखिर उनका बच्चा क्यों नहीं अच्छे अंक प्राप्त नहीं कर पा है। ऐसा करने से बच्चे की कमजोरी का पता चल जाता है। जिसपर प्रयास कर के ठीक किया जा सकता है। पढ़ाई की क्रिया के समीप ऐसी बहुत सी बातें होती है, जो बच्चों को सिखाना पड़ता है। जैसे अनुशासन, खुश रहना , स्वस्थ रहने की कला, सामाजिकता पढ़ना -सुनना -लिखने के वृत्त की महत्ता इत्यादि | परीक्षा देने के तरीके सिखाना भी जरूरी है। कुल मिलाकर कहने का तात्पर्य यह है, कि बच्चे के स्थान पर अपने आप को रखकर हमें उसकी परेशानियों को समझना चाहिए। और उसे दूर करने का प्रयास करना चाहिए। अपने बच्चों को अनुशासन उत्साहित करना बहुत महत्वपूर्ण है। इससे वे अपने माता-पिता को सबसे अच्छा मित्र समझने लगते हैं। और अपनी जिम्मेदारी निभाने में अधिक सक्षम बन जाते हैं।

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2. Causes Of Refraction of Light Physics Class 10

Cause of Refraction : The speed of the light in different transparent substances is different. For example speed of light in air is 3×10⁸ m/s and that of in glass is 2×10⁸ m/s. It is clear that the two speeds of the light are different. When light enters from air to glass the speed of the light gets decreased at the junction of the two media. This change in speed of the light affects the speed the of the various segments of the beam of the light. This can be concluded by the image. This change in speed of the light causes refraction.

Therefore the refraction of light is due to the change in the speed of light on going from one medium to another.

Now it is good question why change in speed causes refraction. Here is the answer. If we look the image carefully. The left part of the beam of light enters first into another medium while its right part remains still in first medium here air. Therefore the speed of the left part of the beam experiences speed reduction before that of the right part of the beam. This causes less distance covered by left side beam and more distance traveled by right side beam.

Dear friend if you have any doubt , then comment please. Or you can give your suggestion about this part of the refraction of light.

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1 Refraction of Light Definition and Introduction Physics Class 10

Refract means bending. The bending of ray of light when it pass from one medium to another medium is known by a term called refraction.

Refraction of Light happens due to different speed of light in different medium. Speed of light in air is 3x10⁸m/s and that of in glass is 2x10⁸m/s.

Refraction of Light: It can be defined as the change in the direction of light when it passes from one medium to another medium obliquely.

A transparent substance in which light can travel is called a medium. For example Air, water, glass, kerosene etc are the transparent substances in which light can travel.

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Important Mathematical Relations of Measurement

Important mathematical relations of measurement.

These are very important mathematical relations. It must be on the tongue of a student . These common relations are seen very frequently in the sum .

| Mass
1 Ton = 10 Quintals	1 Quintal = 100 Kg
1 Kg = 1000 g	1 pound = 453 g
Distance
1 Km = 1000 m	1m = 100 cm
1 feet = 12 inches	1 inch = 2.54 cm
1 yard = 3 feet
Time
1 year = 365 days	1 month = 30 days
1 week = 7 days	1 hour = 60 min
1 min = 60 seconds	1 day = 24 hours
Countable
1 gross = 144	1 dozan = 12
Re 1 = 100 Paise

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Important Squares And Square Root Lower Grade Students Mathematics

Important Squares and their square root.
THE STUDENT MUST MEMORISE THIS BY TONGUE.

42 = 16	112 = 121
52 = 25	√(25)=5
62 = 36	√(36)= 6
72 = 49	√(49 ) = 7
82 = 64	√(64)= 8
92 = 81	√(81)= 9
102 = 100	√(100) = 10
112 = 121	√(121) = 11
122 = 144	√(144 ) = 12
132 = 169	√(169 ) = 13
142 = 196	√(196 ) = 14
152 = 225	√(225 ) = 15
162 = 256	√(256 ) = 16
172 = 289	√(289 ) = 17
202 = 400	√(400 ) = 20
252 = 625	√(625 ) = 25

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In Time of Adversity Question Answer Class 8

This chapter is about a letter written by a young lady; whose father was victim of this terror attack.

Q(01) Where was the writer's father when the terrorist attack took place? Who was with him?

Ans: The writer's father was at the Indian restaurant on the first floor of the Oberoi hotel when the terrorist attack took place. His two best friends were with him .They were having dinner together.

Q(02) How did the writer's father save himself? What were the qualities that helped him to protect?

Ans: The terrorist rounded up the hostages and made them to climb the service staircase, the eighteenth floor. On reaching the eighteenth floor landing ,they made the people line up against the wall then they opened fire on the people simultaneously . Her father was at the center of the line and body as soon as the firing began . He protected himself out of reflex or his presence of mind .    

Q(03)What did the writer's father and other survivors do to keep themselves alive till help arrived?

Ans:  When the terrorist left the landing after setting up explosive , the lady's father along with the three other survivors, climbed up the rest of the stairwell and discovered a large HVAC Plant room in which they decided to take shelter . They spent the rest of seige hiding in that room trying to get the attention of the world outside by waving a makeshift flag out of the window .They drank sips of dirty water from the Air conditioning unit to survive.

Q(04) The terrorists attacked people at every level .Explain this line in the context of the eventful day.?

Ans:  When terrorist attacked people they do not discriminate among them.They killed young kids and even the pregnant woman .They killed middle class workers at the railway station , elite in the hotels, tourist and kids in a cafe and sick and dying in the hospitals.They killed Indians, Americans, Britans and several other nationalities .Men, women, children, policeman,fireman and doctors etc were also killed.

Q(05) Q(05) What are the ideas behind every terror attack that the writer can recognise ? Do you agree with the writer's views? Justify your answer. .........

Ans:  The ideas behind every terror attack is the hatred anger and desperation of the terrorists and the cold-blooded targeted ruthlessness of these who sent them .They respect nothing but their own twisted beliefs to achieve them .They have declared war on every other way of life. Yes , I agree with the writer's views.     

Q(06) Why does the writer want to thank the readers? How have the readers helped the writer ? .

Ans:  Writer wants to thank the reader for the incredible concern and support that the readers have shown for the Mumbai victims when the whole of Mumbai was under terrorist attack. The reader helped the writer through their concern sympathy and prayers for the people of Mumbai who were under attack.     

Reference to the context -
(1) They communicated to each other by tough as they were too afraid to make a sound.

Q(a) Who does 'they' refer to??

Ans: Here 'they' referred to the survivors who survived from the mass murder of the terrorist at the eighteenth floor of the Oberoi hotel.

Q(b) Why were they afraid to make a ?

Ans: They were afraid to make a sound because a small sound in the room might bring back the terrorist would find that there were survivors , they would show no mercy and killed them.    

Q(c).What had happened to them ?

Ans:  The terrorist rounded up all the people of the Oberoi hotel and took them to the eighteenth floor landing. They made the people line up against the wall and opened fire on the people simultaneously.

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(2) This was systematic, cold-blooded,slaughter.

Q(a) What is being described here?

Ans:  Here the writer describes a series of synchronized terror attack at various places in Mumbai.

Q(b) Why does the writer say so?

Ans:  The writer said so because terrorist attack people at every level. They did not show mercy to the children and the old.They killed middle-class workers , elite ,tourists and kids .They stormed three hospitals and killed the sick and dying .They did not discriminate among the different nationalities.They killed men, wonen , children, policeman, firemen , doctors.

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(3) Over the next week....I hope the rest of the world does too.

Q(a) What is the writer talking about in these lines?

Ans: The writer is talking about the terrorist attack in Mumbai and the victims those who are killed .Writer wants everyone to pray for the souls of the ******.She also request everyone to help the victims who survived .She wants us to help them to come back to their normal life.

Q(b) Why does the writer want the world to do the same ?

Ans: Writers want world to do the same because terrorism is not a problem in any particular country . It is now a global war and people of every country are fighting to combat terrorism . So, it should be a joint fight and we should help one another to solve this global problem.   

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Lochinvar English Literature Question Answer Class 8

Q(01) Where was the Lochinvar going ?Why was he in such a hurry?

Ans: Lochinvar was going to the Netherby hall in marriage ceremony of fair Ellen. Lochinvar loves Ellen but Ellen’s father has forced Ellen to marry somebody else .Ellen ,that day is getting married at the Netherby Hall .So ,Lochinvar is in a hurry to reach there.

Q(02) Describe the exchange that took place between the bride’s father and Lochinvar , when the latter entered Netherby Hall.

Ans: When Lochinvar entered the Netherby Hall , the bride’s father stopped him and asked him whether Lochinvar had come there to have a war with them or he had come there ina peaceful and jovial mood to dance at the marriage party .Lochinvar’s replied was that he had loved Ellen at one time but then the love had decreased like a low tide .Many young beautiful women in Scotland are eager to marry him .So, Lochinvar had come there to dance and have a cup of wine at the party.    

Q(03)Did Lochinvar mean what he said?

Ans:  No, Lochinvar did no mean what he said because he still loved Ellen and he had come to take her away along with him.

Q(04) What did young Lochinvar tell the bride?

Ans:  The young Lochinvar drank the wine which the bride had offered him .He then took her safe hand and asked her to dance with him.

Q(05) How did the bride’s parents react to Lochinvar’s action?

Ans:  Ellen’s mother wanted to stop Ellen from dancing with Lochinvar ,but she could not so both the parents fumed in anger.     

Q(06)When Lochinvar and bride began to dance ,what did the bridesmaid said?

Ans:  When Lochinvar and the bride began to dance ,the bridesmaid whispered that it could have been better if their fair cousin was married with the young Lochinvar .     

Q(07) How did Lochinvar manage to ride off with his lady love?

Ans:  While dancing with Ellen ,young Lochinvar whispered something to Ellen’s ear and they both reached the hall’s door .The horse of Lochinvar was standing near the door. Lochinvar very easily put Ellen on horse back and he himself sat in front of her .Then They both rode away from there.     

Q(08) What happened after Lochinvar rode away with the bride ?

Ans:  When Lochinvar rode away with the bride , soldiers from Netherby Hall chased them on the order of Ellen’s father .The soldiers persued Lochinvar through many villages. There was racing and chasing on Connobie Lee but they were not able to catch the couple.     

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Essay on Importance of Game in Our Life | हमारे जीवन में खेल का महत्व पर निबंध

खेल मनोरंजन के स्रोत हैं। वे राहत और दुख, कठिनाइयों और बाधाओं से हमको बचाते हैं।

वे विनोदी भावना मन में न बैठाने और एक हल्के-फुल्के अंदाज में जीवन के भारी बोझ को लेने के लिए प्रेरित करते हैं। जीने को साधारण व्यवसाय के रूप में लेने की प्रेरना भी प्रदान करते हैं। यह स्वास्थ्य और शारीरिक फिटनेस बनाए रखने के लिए आवश्यक है। यह टीम भावना के विकास को प्रोत्साहित करती है।

आउटडोर गेम्स: आउटडोर खेल जैसे फुटबॉल, वॉली, क्रिकेट, बास्केट बॉल और टेनिस आदि दुनिया भर में बहुत लोकप्रिय हैं। हाल ही में, विश्व कप फुटबॉल सभी खेल प्रेमियों के लिए ध्यान का केन्द्र बिन्दु था। टेबल टेनिस दुनिया के कई हिस्सों में खेला जाता है।

ओलिंपिक खेलों को 4 साल के अंतराल के साथ आयोजित किया जाता है। यह एकता की भावना और राष्ट्रों के बीच सच्चे विनोद की भावना को बढ़ावा देता है।

खेल को प्राथमिक कक्षाओं से शैक्षिक पाठ्यक्रम के एक भाग के रूप में अनिवार्य किया जाना चाहिए। शुरू से ही बच्चों को खेल और खेल की उपयोगिता का एहसास होना चाहिए। खेल-कूद से अनुशासन, साथी-भावना और एकजुटता की भावना प्रदान होती है। वे समय के मूल्य को पढ़ाने और यह नोट करने के लिए कि कैसे एक मिनट, एक मिनट का एक अंश और यहां तक की दूसरे की प्रतियोगिता के क्षेत्र में एक युवा खिलाड़ी के भाग्य का फैसला करने में महत्वपूर्ण है। खेल और खेल में उचित प्रशिक्षण के साथ, छात्र सक्रिय, विनोदी, तेज़, साहसी और साहसिक भविष्य के जीवन में चुनौतियों को पूरा करने में सक्षम हो जाते हैं।

इसे ध्यान में रखते हुए, यह उच्च समय है कि हम अपने खेल प्रतिभाओं को बाहर हाज़िर करें और उन्हें संशय की भावनाओं के साथ विश्व चैंपियन के साथ प्रतिस्पर्धा करने के लिए सक्षम करने के लिए सभी आवश्यक सुविधाएं प्रदान करें।

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Essay on If I had Wings In Hindi

जब छोटे थे हम मन में एक सवाल आता था आसमान को देख कर, यदि मेरे पंख होते तो क्या होता? अगर होते तो वो बड़े अनोखे होते। वो कभी न थमते, न कभी मुझे किसी के हाथ आते। बस उड़ा ले जाते मुझे जहाँ मेरा मन होता। जब स्कूल जाना होता, तो किसी से बिन बताये ले जाते मुझे ये उस पार्क में जहाँ सबसे ज्यादा झूलें होते और झूलने के लिए अपनी बारी का इंतज़ार भी न करना पड़ता क्योंकि तब सब बच्चे स्कूल में पढ़ रहे होते।

ये पंख मिल जाते तो हवाई जहाज़ का सफर मुफ्त में होता। मैगज़ीन में जिस देश की फोटो थी, वो देश देख लिया होता। हवा मेरा ठिकाना होती, बस पैर कभी ज़मीन पे न टिकते। माँ को रोज़ कहीं न कहीं घुमा आते मैं और मेरे ये पंख। अपने बेस्ट फ्रेंड को उसके जन्म दिन पर एक दिन के लिए तोहफ़े में इन पंखों की उड़ान दे दी होती। ठंडी हवाओं में बस मैं और मेरी उड़ान होती। रोड क्रॉस करने में डर नहीं लगता क्योकि क्रॉस ही नहीं करनी पड़ती। बस हवा में हर जगह पहुँच होती मेरी। रुई जैसे बादल को अपने हाथों से छुने को मिलता। किसी बादल को आइस-क्रीम तो किसी को साइकिल बना लेते हाथों से।

मन करता की जल्दी-जल्दी हर जगह घूमना हो जाता। मेरी उड़ानों के दौरान हर सुन्दर नज़ारा मेरी आँखों के सामने से गुज़रता। पकड़म-पकड़ाई में कोई मुझे नहीं पकड़ पाता। छुपन-छुपाई खेलते हुए पेड़ों पर बड़े आराम से छिपना हो जाता। बारिश होती तो ऊपर उड़ान भरने पर समझ आ जाता कि आखिर ये बारिश होती कैसे है। किताबों से जानना नहीं पड़ता। सब सामने आसमानों में ही देखने को मिल जाता।

आज ऐसे लगता है, है तो पंख मेरे पास। मेरा ज्ञान, मेरी सोच। मैं सिर्फ शरीर तो नहीं, आत्मा हूँ। मेरे पंख मेरा ज्ञान और मेरी सोच ही तो हैं जो नजाने कहाँ-कहाँ ले जाते हैं मुझे। कितना कुछ मुझे दिखाते हैं। ज्ञान है तो, समझ होती है, हमारे कदम बस बढ़ते ही रहते हैं। पँखों की शक्ल में लगे हैं हर वक़्त, जो कोई काट नहीं सकता, अलग नहीं कर सकता। न तो ये तोड़े जा सकतें हैं, ना ही मरोड़े जा सकतें हैं क्योंकि कभी किसी के हाथ ही नहीं आ सकते। हर देश विदेश ले जा सकते हैं। सोच ही तो है, जितनी बड़ी उतना ऊँचा ले जाती है। मेरे पंख मेरे पास ही हैं । दिखते तो नहीं पर मेरे साथ ही हैं । बस ये और बड़े हो जाएँ और मुझे हर जगह ले जाए ।

.........यदि मेरे पंख होते निबन्ध हिंदी में............

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मेरी यादगार यात्रा पर निबंध | Essay on My Memorable Tour in Hindi

यात्रा का अपना एक सुखद अनुभव होता है। हर यात्रा अपने में कई यादें समेटे होती है पर कुछ बहोत यादगार होती हैं । गर्मी की छुट्टियों में अधिकतर लोग घूमने जाते हैं और इस मौसम में पर्वतों की यात्रा अत्यधिक सुखद होती है।

हमारी पहली पर्वतीय यात्रा पिछले वर्ष गर्मी की छुट्टियों में हुई जब पिताजी के पुराने मित्र ने नैनीताल में अपने आवास पे एक समारोह रखा और पिताजी को आमंत्रित करने के साथ साथ ज़रूर आने का आग्रह भी किया।

पिताजी ने इस आग्रह का सम्मान करते हुए समारोह में जाने के लिए और साथ साथ नैनीताल घूमने के लिए पांच दिन की योजना बनायी। हमने 20 मई को नैनीताल के लिए रेल पकड़ी और अगले दिन सुबह 10 बजे वहां पहुँच गए। स्टेशन पे पिताजी के मित्र हमें लेने आये हुए थे।

हम उनके साथ उनके घर गए। उन्होंने पिताजी की योजना की सराहना करते हुए उन्हें आने के लिए धन्यवाद कहा और हमें नैनीताल घुमाने की जिम्मेदारी अपने ड्राइवर को सौंप दी। क्योंकि समारोह तीन दिन बाद था तो हम नैनीताल घूमने निकल गए। नैनीताल के रास्ते बहुत टेड़े मेढ़े थे और रास्ते के दोनों ओर घाटियों का मनमोहक दृश्य था। कहीं ये घाटियां अत्यंत सुन्दर थीं और कहीं इनकी गहरायी डरा देने वाली थी। पर्वतों पर पेड़ों की सुंदरता देखते ही बनती थी। गर्मी के मौसम में भी शीतल हवायें मन को अत्यंत सुख दे रही थीं। नगर की सड़कें स्वछ थीं और घर साफ़ सुथरे थे नैनीताल का नाम एक ताल के कारण पड़ा जो वहां पर है जिसका नाम भी नैनीताल है। इसी ताल के एक किनारे पे नयना देवी का मंदिर है। मंदिर के बहन अत्यंत खूबसूरत पर्वत हैं जो सबका मन मोह लेते हैं। उसके अलावा भी नैनीताल मैं कई स्थल हैं जो बेहद मनमोहक हैं। तीन दिन हम काफी घूमे। उसके बाद पिताजी के मित्र के यहाँ समारोह मैं सम्मिलित होकर हमने अगले दिन घर के लिए रेल पकड़ी।

नैनीताल की यह यात्रा मेरे लिए बहुत सुखद और यादगार रही। वहां की प्राकृतिक सुंदरता ने मन मोह लिया और वहां के दृस्यों को मैं कैमरे में कैद कर लिया। अवसर मिलने पर मैं एक बार फिर ऐसी सुखद यात्रा पे वहां अवश्य जाना चाहूंगा।

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Newton's Third Laws of Motion For Class 9 Physics

Newton's third law : 'To every action there is an equal and opposite reaction.'
This law can be realised while dropping a ball, hammering a nail , holding a hose pipe of high pressurised water pump , during bicycling etc.

Suppose a man pushes an object with a force F, then the object react to this force with an equal and opposite of that force. That means if the man pushes the object with a force F₁₂ then the object pushes him back with the same force F₁₂ but as it is opposite to the direction of the man's force therefore it can be represented as -F₁₂ . See the image.

Now we will explain the three case as shown int the video. You can also watch the video.

Case 1 [Hose Pipe]: When a man holds a hose pipe of high speed water rushing out from the pipe. The stream of water jet put an action on the hand of the man. Due to this action the man's hand pushes backward. Due a contact between pipe and the man's hand a reaction is produced that helps in holding the pipe.

Case 3 [A man jumping from a Boat]:     When a man jumps out from a boat , the boat get pushed back. It is because the the man put an action while jumping out of the boat. The boat in return produce a reaction on the man. As the boat is not fixed this force causes boat to go back. In this proces the man get support while jumping due to the reaction force.

Case 2 [Bicycling]:     While bicycling , the wheel of the bicycle exerts a pressure on the ground . This is an action against the ground. At the same time the ground also react with reverse force. This is called reaction. Due to this the man get support while bicycling.

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Summary of 'The Beginnings of a Miracle' | English Literature Class 8

By Helen Keller

This tale recounts Helen Keller’s discovery of language, through the teaching of Annie Sullivan, after losing her sight and hearing in early childhood. When the Helen family comes to know about the illness, they are flabbergasted. Helen is sent to a blind school where she meets with a teacher Annie Sullivian. Helen is lost and often throws tantrums but Annie reaches out to her through language. She teaches Helen to hand-spell many words. Helen follows pursuit like a memorising game. Next annie tries to teach her discipline. But having brought up as a lone child in her house, Helen throws tantrums and out of force of habit she throws the pitch of water at Annie. Annie forces Helen to refill the jar, when Helen realises that each and every item has a name. In the end, Annie and Helen travel to the Perkinsons institute and Helen realises that she is not alone anymore.

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4. Rating of Electrical Appliance and Calculation of Electrical parameters

Rating of Electrical Appliance:These are normal rating of electrical appliances available in the market. Electric bulb-100W, 60W, 15W
Fluorescent tube- 40W, 20 W, 80W
CFL lamp- 5W, 15W, 20 W, 40W, 90W
Refrigirator- 220 W
Micro Oven- 3000 W
Electric Iron- 700W
Induction Heater - 1500 W

From the rating of the electrical appliance , we can calculate the resistance of the filament, current flowing through the filament.

Also electrical energy consumed (WHr) can be calculated by multiplying the watt and duration of time in hour.

By converting the energy into bigger unit i.e. KWHr , the practical unit consumption of our houses can be find out. This is called KWhr or unit of electrical energy.

Today's average rate of electricity is around Rs 7.50 / unit.
It means if 200 unit reading is on the electric meter. It means we need to pay 200*7.5+ constant charge for maximum demand.
Rs 1500+ 100 = Rs 1600 approx.
The constant charge varies for maximum demand allowed during new connection.

Calculation of unit consumed: For example let 500 watt load is running in our house for 8 hours. Then unit (KWHr) consumed will be
500 W x 8 hr
=4000 Whr
=4000/1000 KWhr = 4 KWhr

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Questions Answers of 'The Beginnings of a Miracle' | English Literature

THE BEGINNING OF A MIRACLE by Helen KellerI.

Q(01). What was the unusual activity that Helen could sense? What were her reasons for sensing it?

Ans: Helen sensed the arrival of her teacher Anne Sullivan. She could also sense it from her mother’s hurried movements.

Q(02). How does Helen describe her life before the arrival of her teacher?

Ans: She compares herself to a groping ship in a dense fog before the arrival of her teacher. In the utter confusion of her life, she craved for light.

Q(03). Which incident ignited the desire in Helen to learn more about the things around her?

Ans: Helen kept confusing the two terms ‘mug’ and ‘waters’. She would be in a frenzy when she could not make them out exactly. Being panicked Helen was led to the well-house by her teacher and made her feel the gush of water on her hand. This incident ignited a desire in Helen to learn more.

Q(04). Mention an incident in the text which proves that Helen’s parents were over-indulgent towards her.

Ans: Helen’s parents always accepted her ways and desires on the grounds of sympathy. This attitude of her parents affected Sullivan’s way of teaching to their child. Once Helen’s father asked Sullivan to spare the child when she went on insisting Helen to learn a certain thing.

Q(05). What was the first lesson that Helen’s teacher wanted to teach her?

Ans: Anne wanted to teach her obedience first by all means.

II.REACHING OUT

Q(01). The narrator says that after sometimes he became distrustful of every glance or gesture and stopped extending essential manners to women and elderly people on buses and trains. Why does he feel this hostility?

Ans: He had faced discrimination because of his coloured skin, so he took a dislike of all the fair –skinned people.

Q(02). When the old gentleman suggests to the narrator that he should apply for a teaching position in the East End of London, the narrator reacts bitterly. Why does he feel angry?

Ans: The residents did not there because it was a rather tough area and most teachers preferred to seek job elsewhere. The narrator felt that the old man was suggesting that he take up a job that has been rejected by the whites. III.OPERATION INDIAN OCEAN

Q(01). What are the challenges, dangers and difficulties that a swimmer would face while swimming across the Palk Strait?

Ans: The seas teem with all kinds of marine life including tiger sharks, barracuda and poisonous snakes.

Q(02). Why was Sen. forced to postpone the swim?

Ans: The unexpected equatorial storm and the chillness in the sea forced Sen to postpone his swim by forty eight hours.

Q(03) What was the most heart breaking moment for Mihir Sen during the swim?

Ans: Sen had gone towards Rameswaram instead of swimming towards Dhanushkodi, which was twenty miles to the north. It was the most heartbreaking moment for him during the entire swim.

Q(04) The goal was in sight, but not the end of the ordeal. Why does the narrator say this?

Ans: He caught sight of the silvery strip of land on the shores of Dhanushkodi, but still he had to swim two and half hours to reach the end.

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Garmiyon Ki Chhuttiyon Ka Maja Essay For class 3 In Hindi | गर्मियों की छुट्टियों का मजा पर निबंध

• १. गर्मियों की छुट्टियाँ मुझे बहुतपसंद है|
• २. ये हमारी वार्षिक परीक्षा के बाद आती है|
• ३. हम इसमे नानी के घर जाते है| नानी हमे कहानी सुनाती है|
• ४. गर्मियों की छुट्टियों मे आइस क्रीम खाते है|

• ५. इसमे हम अपने दोस्तो के साथ केरम , विडिया गेम,साँप सीढ़ी और अन्य कई सारे खेल खेलते है|
• ६. हम परिवार के साथ हर साल हील स्टेशन जाते है| जहा हम नयी नयी जगह घूमते है , शॉपिंग करते है| फॅमिली फोटो लेते है|
• ७. गर्मी की छुट्टियों मे हम हॉबी क्लास भी ज्वाइन करते है| जेसे :- तैराकी(स्वीमिंग), कला शिक्षा (आर्ट क्लास), इत्यादि|
• ८. गर्मी की छुट्टियों मैं देर तक सोने का मज़ा भी बहुत अलग होता है| रोज़ प्रातः जल्दी उठकर स्कूल नही जाना होता है|
• ९.माँ भी बहुत सारे पकवान बना कर खिलती है|
• १०. शाम को हम दादा-दादी के साथ टहलने बगीचे मे जाते है और झूलो का आनंद लेते है|
• ११. हम इस बार गर्मी की छुट्टियो मैं घर के बगीचे मैं पौधे भी लगाएगे|
• १२. छुट्टियों मैं बिद्द्यालय से मिला होम वर्क हम सभी दोस्त साथ मिलकर करते है|
• १३. इस बार की छुट्टियो मैं मेरे घर पर चिड़िया ने बच्चे दिए थे, हम उनको रोज़ दाना डालते थे|
• १४. मेरी बहन का जन्मदिन भी गर्मी की छुट्टियो मे आता है, हम उसका हर जन्मदिन नानी के घर मानते है|
• १५. पापा छुट्टियो मे ही अगली क्लास की पुस्तके और नोटबुक दिला देते है और उन पर कवर लगा देते है|इस तरह छुट्टिया ख़तम होते होते हमको अगली क्लास के लिए भी तैयार कर देते है
• १६. हर साल हम नयी यूनिफार्म भी छुट्टियो मे ही खरीद लेते है और स्कूल के प्रथम दिन उसे ही पहन कर जाते है|

धन्यवाद|

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Ghar Me Mehman Aye Hain Unme Se Aap Kiske Saath Jyada Samay Bitaye Usko Samwad ke Roop me likhiye | घर में मेहमान आए है उनमें से आप किसके साथ ज्यादा समय बिताये उसको , संवाद रूप में लिखिए

दृश्य सिमरन के घर का है। सिमरन के घर उसकी पुरानी सहेली शहनाज़ आई है। दोनों ने एक ही कॉलेज से पढाई पूरी की है। सिमरन की शादी ग्रेजुएशन पूरी होने के बाद ही हो गई, और शहनाज़ ने आगे काम करने की ठान रखी थी; सो उसने ऐसा ही किया। ३ साल बाद आज शहनाज़ की भी शादी हो चुकी है। शहनाज़ शादी के बाद पहली बार अपनी सहेली सिमरन से मिलने उसके घर आई है , अपने देवर की बेटी रुनझुन के साथ। शहनाज़ की शादी उसके पड़ोस के मोहल्ले में ही हुई है , तो वह लगभग हर दूसरे दिन अपने मायके आ जाया करती है। आज रुनझुन को लेकर वो अपनी सहेली के साथ पुरानी यादें ताज़ा करने आई है।

सिमरन : नमस्ते !
शहनाज़ : नमस्ते अज़रा!
सिमरन : कैसी हो? कितने दिनों बाद दर्शन हुए तुम्हारे। कहाँ हो आजकल ? तुम ना , शादी के बाद एकदम ईद का चाँद ही हो गई हो।
शहनाज़ : अरे नहीं अज़रा। दरअसल, शादी के बाद मैं तीसरे दिन ही ऑफिस के काम से बैंगलोर चली गई थी।
हालाँकि ये लम्बा प्रोजेक्ट था , पर मैंने काफी धीरज रखा। तीन महीने बाद आई हूँ वापस।

सिमरन : अच्छा , तो ये बात है ! मोहतरमा को शादी के बाद भी इतनी जल्दी काम पे लगना था। चलो अच्छा है , इसी बहाने कहीं घूम के तो आई। भाईसाहब भी साथ ही गए थे ?

शहनाज़ : नहीं अज़रा। हम दोनों ही काम में व्यस्त हो गए। उनको भी मुंबई में कुछ इम्पोर्टेन्ट मीटिंग्स अटेंड करनी थीं , और काम का बोझ भी कम नहीं था, तो उन्होंने कहा कि जैसे ही मेरा प्रोजेक्ट पूरा होता है, हम साथ में कहीं घूमने जायेंगे। अब जाके तो फ़ुर्सत मिली है। देखते हैं , कुछ दिन अपने नए परिवार के साथ समय बिता लेती हु, फिर तो घूमने जाना ही है।

अज़रा: वाह शहनाज़। मियां -बीवी दोनों को काम से फुर्सत मिली है , ज़रूर जाओ, घूम-फिर के आओ। फिर पता नहीं कब मौका मिले। तुमको अपने प्रोजेक्ट्स से और भाईसाहब को मीटिंग्स से और पता नहीं कब फुर्सत मिलेगी फिर। हम भी शादी के बाद शिमला घूमने गए थे। दो हफ़्तों बाद आये। वो जगह इतना सुकून देती है , कि वापस आने की इच्छा ही नहीं होती है। तुम भी किसी जगह जाओ , जहाँ भीड़-भाड़ से राहत मिले, काम से सुकून, और फिर सबसे अच्छी यादें जुड़ जाये तुम्हारी ज़िन्दगी की डायरी के पन्नो में। सबकुछ यादगार होना चाहिए , ज़िन्दगी तभी और बेहतर लगने लगेगी।

शहनाज़ : हाँ अज़रा। बहुत अच्छी सलाह है। गर्मी का समय चल रहा है,तो हम भी किसी ठंडी जगह घूमना चाहते थे। देखते हैं क्या सलाह होता है , और कहाँ जा पाते हैं। तुम बताओ , तुम्हारे बच्चे कैसे हैं?
शरा स्कूल जाने लगी अब ?
सिमरन : हाँ , शरा ३ महीने से स्कूल जा रही है। मेरी देवरानी की बेटी फातिमा ने भी साथ में ही पढाई शुरू कर दी है। इनकी गर्मी की छुट्टियों का इंतज़ार करना होगा अब तो मायके जाने के लिए भी।
शहनाज़ : हाहा ! सही बात है अज़रा। बच्चों की पढाई शुरू हो गई , बस फिर पूरा समय उन्ही में गुज़रता है। खुद के लिए भी वक़्त नहीं मिल पाता।
सिमरन : हाँ वो तो बिलकुल ठीक बात है। और बच्चों की हंसी -ख़ुशी में ही माँ -बाप की ख़ुशी जुड़ जाती है। ये सबसे ख़ूबसूरत पहलु है। हम कितने निःस्वार्थ हो जाते हैं , और बच्चों से भी कितना ही कुछ सीखते हैं। v शहनाज़ : हाँ सिमरन ! तुमने सच में बहुत महत्वपूर्ण बात कही है। शादी,और बच्चे , हमारे जीवन में कई म्हहत्वपूर्ण बदलाव लाते हैं। हम कई ज़्यादा ज़िम्मेदार होने लगते हैं , और नया सीखते हैं। मेरा इस सफर में अभी पहला पड़ाव है , पर तुम्हारी बातें सुन कर ये यकीन हो गया है , कि आगे का सफर भी उतना ही खूबसूरत और साथ -साथ चुनौती भरा होगा।
सिमरन : हाँ। और आज के दौर में महिलाओं को दोनों मोर्चे सँभालने होते हैं। घर - काम , दोनों ज़िम्मेदारियाँ जो बखूबी निभा ले, आज के युग में ऐसी महिलाए आकाश चूम रही हैं। मेरी शुभकामनाएं हैं , तुम्हें अपने काम में भी खूब तर्रकी मिले , और तुम्हारा ये नया सफर भी उतना ही रोमांचक और ख़ूबसूरत हो।

शहनाज़ : हाँ अज़रा। मैं तुम्हारे लिए भी ऐसी ही दुआ करती हूँ। ये देखो , हमारे देवर की बेटी रुनझुन , आपके घर में कैसे उधम मचा रही। बहुत शरारती है। मैं पास वाले पार्क में इसे सहेलियों से मिलाने ले जा रही थी। सोंचा तुमसे मिले काफी दिन हो गये हैं , सो मिल आती हूँ। वो तो ससुराल और मायके एकदम नज़दीक है , सो काफी सुकून है। जब चाहे मायके वालों से मिलने आ जाती हूँ। तुम भी आओ एक दिन दावत पर हमारे यहाँ। हम इस हफ्ते यहीं हैं। बुधवार को आ जाओ। अपने ससुराल वालों से मुलाकात करवाएंगे। और हमें बोहोत ख़ुशी होगी हमारी सहेली आएगी तो।
सिमरन : बिलकुल शहनाज़ ! हम आते है फिर बुधवार को तुमसे और तुम्हारे परिवार से मिलने। जाने कब मुलाकात होगी फिर।
शहनाज़ : बिलकुल,और शरा , भाईसाहब और फातिमा को साथ ज़रूर लाना। अभी मैं इस शरारती रुनझुन को थोड़ा घुमा के लाती हूँ , वर्ना ये ऐसे ही उछल -कूद करेगी आपके घर में। चलती हूँ।
सिमरन : अरे नहीं। उधम कैसी ? प्यारी बच्ची है रुनझुन। फिर ज़रूर आना। मिलके अच्छा लगा !
शहनाज़ : जी ज़रूर ! तुमसे भी बुधवार को मुलाकात होगी , आशा करती हूँ। नमस्ते !
सिमरन : बिलकुल मिलेंगे। नमस्ते !

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A Summary of The Corner Shop

Please find below the summary of The corner Shop. Do let me know for change, improvement anything you think.

It is often said ‘The best ghost stories don’t have ghosts in them; rather, you see the result of its actions.’

For centuries readers have been attracted to the mysterious air surrounding ghosts and other supernatural beings. It is probably this sense of wonder and fear that makes ghost stories so addictive and hard to put down. An example of such a story is Cynthia Asquith’s The Corner Shop. The Corner Shop starts out as a happy story of a man, Peter Wood who discovers an antique shop filled with vintage trinkets run by two charming, young women. Upon browsing through its offerings, the man purchases a jade frog figurine at a throwaway price. Content with his purchase, Peter decides to make frequent visits to this lovely little shop. However, there is something sinister lurking behind the scenes.

On the second visit to the store, Peter is in for an eerie surprise. Gone are the two wonderful ladies, gone is the joyful vibe of the shop. Instead, he is welcomed by a blanket of gloom and an old man with a serious demeanor. The young man soon learns that his purchase is worth much more than the price he paid for it. Driven by a strong conscience and sense of fairness, Peter offers to give back the money to the owners of the shop. To his astonishment, he is told an incredible story by the two women. The story tells a poignant tale of past mistakes and the old man’s desire to make amends. The last few pages of The Corner Shop really puts the story into perspective and makes the reader feel like the pieces are finally falling into place. A story encompassing out worldly elements whilst combining real human emotions, The Corner Shop will definitely warm your heart.

Being a short story, there is not much scope for character development and so you are left wanting to know a little more about the characters. Details about their personalities or families are a bit unclear. Aptly named, The Corner Shop is free from gruesome descriptions and malevolence. However, the text is littered with references and descriptions of haunted elements. The weather plays a key role in the depiction of moods and a stark contrast can be inferred through its descriptions.

Cynthia Asquith succeeds in painting a ghostly picture with her words and manages to send chills down your spine. Read this story if you’re a fan of horror stories with underlying dramatic themes.

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3 Commercial Unit Of Electrical Energy Physics Class 10

Th S.I. unit of energy is joul(J).
Let the power (p) of an electrical appliance = P watt
Let it is used for t seconds.
Then Electrical energy consumed (W) = P x t watt-second
i.e. W = Pt Watt-second
or W = Pt Joul (Joul is Mechanical unit equivalent of Watt-second)

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In practice bigger unit like Watt-Hour (Wh) or Kilo Watt Hour (KWh) is used for Electrical energy consumption. Watt-Hour : It is the electrical unit consumed by an electrical appliance of P watt that was used for 1 hour. 1 w-hr = 1 watt x 1 hr
= 1 w x (60x60)second
=3600 watt-second
=3600 Joul
1 Whr =3600 J

Kilowatt-Hour: One kilowatt-hour is the electrical energy consumed by an electrical appliance of power rating 1 kw when it used for 1 hour.
1 KWhr = 1 kilowatt x 1 hr
= 1000 w x (60x60)second
=3.6x10⁶ watt-second
=3.6x10⁶ Joul
1 KWhr = 3.6x10⁶ J

The electrical energy consumed in our houses or in industries are measured in KWhr . This is also called ! unit electrical unit consumed. The rate delared by governmet is Rs 8 per unit. It means Rs. 8 per KWhr

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2.Electrical Power and its Expression For Class 10

Electrical Power: Rate of electrical energy supplied by a source e.g. a power station or an alternator or a dc battery etc is called electrical power.

∴ Power = Electrical Energy supplied / Time
if Power = P
Energy supplied = W
and Time = T
Then P = W / T
if W is in Joul
T in second
then unit of power will be Joul/Second (J/S); which is called watt.
∴ watt = j/s
∴Electrical Power, P=W/t=V.I=V²/R=I².R
You are requested to suggest to make this chapter explanation better. So comment please.

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Love Concern Humanity And Trust are the Eccentric Features of Mankind

Love Concern Humanity And Trust are the Eccentric Features of Mankind . Quoting examples from chapters : "The Last Leaf", Journey by Night", and "God Lives in Panch", Justify the statement .

The main element which makes us differ from the rest are the qualities we possess.” Human nature is something which cannot be taught but which is self-existent. We, having an upper hand in the eco system, have something which other creatures lack. It is that object of our conscience which makes us good. Saying simply good is not enough because we are much more than being good. It is this positive quality in us, which makes us good.

“The last leaf” by O Henry tells us the tale about unconditional concern which is not bounded by relationship but out of sheer care for one another. It is not only those people who are bounded by relationship care for one another but also those people who understand are not bounded but yet understand the pain of another. This chapter has taught us that even a stranger can try with his/her whole heart to reduce the pain of another. It is that love which has no conditions to be kept. This story has shown us how we receive unexpected gratitude by even keeping lives at stake.

‘Journey by night’ by Norah Burke is something which each and every person should read because it will restore your will to do each and everything until it is done. Bravery is bestowed in this story and it is something to learn because, when a little boy can do it for his sibling then why can’t we? The determination and perseverance seen is very astounding and shows everyone what bravery looks like. It also tells us unimaginable love which he has for his brother.

‘God lives in Panch’ by none other than Munshi Prem Chand is one of the most exalting stories we have ever read because it has taught us to turn down our ego and it has lived by the saying “An eye for an eye will make the whole world blind” because revenge never taught us to be good but it made us more sinful. The tale of two best friend who are caught up in situations and deciding what is just for one another makes them archenemies but the protagonist does something which is barely seen in today’s time. He does not let the spirit of revenge come his way and does good to his best friend. Don’t you think this is what life is all about? To forget the un just things done to you, to shower love upon others and breaking the link which makes friends frown and become enemies. In this fast pace of life, we forget to do little things to our loved ones because we are too caught up in ourselves. Man should know that money is not the true treasure to seek, it is nothing but man made paper which doesn’t last a life time, love is the bounty which will never go empty. Each and every person should be known by his/her qualities which are already built in him, irrespective of the fact whether he know it or not. These qualities are those instincts which makes him a good person, even though he’s been an alternate person in the past. The worlds disparities, bad experiences and bad influences shun those good qualities which we possess. I think it is high time that we should try to be those persons who we used to be.

Mankind wouldn’t have survived if he would not have those eccentric features. Even tongue less creatures have those powerful elements in them which makes them naïve and beautiful. Harmony will be attained only when we learn to be humble.

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Ohm's Law of Current Electricity Physics Class 10

Ohm's Law: It can be defined as "The potential difference (P.D.) across a conductor is proportional to the current flowing through it provided that physical conditions remain constant." If V = Potential Difference (P.D.)
I= current
Then we can write V ∝ I
Or V= I. R
R= Constant and it is known as resistance of the conductor.
It also means that
V/I = Constant(R) , If all surrounding conditions are constant.

The resistance of a conductor depends on:
1. Length of the conductor.

2. Area of cross section of the conductor.

3. Type of material of the conductor.

It is because of the type of the material different conductors have different conductance. Copper is more good conductor than iron. Similarly silver is more good conductor than copper. Conductance of silver is slightly more than copper. As silver is costlier than the copper therefore we use copper instead of silver to ignore slight advantage of conductance.

4. Temperature of the conductor.
If the temperature rise is from t₁⁰C to t₂⁰c and co-efficient of temperature is α.
Let Resistance at t₁⁰c = R₀
and let Resistance at t₂⁰C = R_t
Then we can write
R_t = R₀ (1+ α . ∆t)
Where ∆t = (t₂ -t₁ )⁰c

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Father's Help English Literature Question and Answer

By:R.K. Narayan
1. At nine-thirty, when he ought to have been shouting............

Q ( A):    What would Swami usually do during prayer time at school?

Q ( B ):    What,According to father,is the cause of Swami's headache?

Q ( C ):    Is Swami honest in his words? When he give the excuse.

Q ( D ):    What was usual activity of Swami mentioned in the first para.

Q ( E ):    Why did Swami change his tactics while giving excuse in front of his father?

Ans. A:    Swami used to shout during prayer time at school.

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Ans.B :    According to father playing too much on weekends is the cause of Swami's headache.

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Ans.C :    No Swamy is not honest in his word. Swamy changed his tactics as per the situation.

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Ans. D :    Swami used to shout out in the School Prayer Hall during prayer time. This was the usual activity of Swami in the school. Perhaps he doesn't like the system of continuous teaching period after period. And also it may be that he used to feel uneasy in the system of the school.

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Ans. E:    Swami knew his father cannot be made fool easily. Also he knew his father was stubborn and strict. Therefore he changed his tactics while giving excuse in front of his father.

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2. As he approached the yellow building he realized............he grieved for him the dark face,.

Q ( A ):    Why was Swami in fears for the consequences of delivering letter to the headmaster?

Q ( B ):    Why was Swami was thinking more about Samuel>?

Q ( C ):    Why Swami realized that he was purjuing himself?

Ans. A:    Swami was in fear for the consequences of delivering the letter, because he new that if he deliver the letter , the Samuel would be dismissed by the headmaster and he would be chained by police and would be finally put in jail.

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Ans. B:    Swami was thinking more about his teacher because his inner soul was good and he didn't wanted the punishment of his teacher. He was much angry on his father for raising the issue unnecessarily that put an unnecessary mental pressure on Swami for unwanted consequences. It was just a matter of excuse for not going to school as small part of his dislike about the school.

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Ans. C:    Swami was feeling guilty for telling lie to his father about his teacher Samuel. This was big concern for his mental puzzle.

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ABCD is a Rhombus. DPR and CBR are straight lines. Prove that: DP.CR=DC.PR

ABCD is a rhombus. DPR and CBR are straight lines.
Prove that:
DP.CR=DC.PR

Solution:

DP.CR=DC.PR
Given ABCD is rhombus .
DPR and CBR are straight lines.
∴ AD||CR
we need to Prove : DP.CR=DC.PR
In ∆ ADP and ∆ PCR
We have :
∠ APD = ∠ CPR
∠ ADP = ∠ PRC
∠ DAP = ∠ PCR
∴ ∆ ADP and ∆ PCR are similar triangle .
∴ we can write
AD/DP=CR/PR
Or AD.PR = DP.CR
∴ DC .PR = DP.CR Proved

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1.Electrical Energy Equation Class 10 Physics

Suppose a Current I flows through a circuit as shown in the figure. The voltage across the resistance is V . The P.D. is the work done to move a charge Q from one point to another point, between which the p.d. is applied.
W = QV
But, Q= I.t

∴ W = VIt

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Another energy equation By Ohm's Law:
V= I. R
Now, W = VIt
W = IR. It
∴ W = I²Rt

We can also write the energy equation in terms of voltage , resistance and time.
W = (V / R )². Rt
∴ W = (V²t) / R

∴ W = Qv = VIt = I²Rt= (V²t) / R

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Summary of the Poem "The Professor" | English Literature ICSE

- writer's name

The man who is the speaker in this poem is a retired professor. He is known as Professor Seth. He addresses his student by telling him "Remember me? I am Professor Seth". The Professor has made a language error while talking to his student but he has used this awkward type of language throughout the poem . He continues by reminding his student that once he used to teach him geography.

While talking to him about schooldays he straight goes into the story of his own life. He is retired now but he is healthy and his wife died some years ago. His children are doing well and they are well settled in their life. So the Professor boasts about his children's status. One is a Sales manager and the other is a Bank manager. They both have cars. He also criticised his other children like his third son who are not doing well. He criticises him by telling this clause that "family must have a black sheep". He then boasts about his two daughters' married lives . Their names are Sarala and Tarala. The daughters have rhyming type of name like the typical Indian family used to name. Then he spoke of his son in laws by appreciating them as nice boys. He thinks that the girls should be married and must be restricted to the four walls of the room. He do not believe that girls need education and work outside like men. We can say that he is an archaic thinker. He then ask his student about how many issues he have? The reply is three by the student. He talks about the changing world on the basis of family planning. He says he is not against it. We must change with times. He talks about India's progress with the modern world. Old values are going and new values are coming. Everything is changing with leaps and bounds. Talking about the modern times and others, the Professor again goes into the matter of his own life. He again says he goes out rarely but his health is good . Only he has usual aches and pains. He has no serious disease like diabetes,blood pressure, heart attack and thinks this is because of his good habits in his youth. He again asks his student "how is his(student) health? ".The student get opportunity to answer but the Professor immediately replies to keep his voice above all. He replies"nice,he is happy for him." Professor Seth has this talkative manner This time he boasts about himself that he is sixty nine this year and hopes to score a century.. The Professor then speaks about the student that he was thin like a stick but now he is a man of weight and consequence. He then invites his student to his residence. The Professor has a boasting habit. Throughout the poem he talks about himself and his family. He gives his student little chance to speak. The student has patience to listen to his retired and old master. Boasting seems embarrassing still Professor Seth does not bother about it .He boasted and boasted.

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Summary Of the Poem 'Be The Best' | By Douglas Malloch

By - Douglas Malloch

The poem " Be the best" teaches us a very important lesson of our life. The title is sufficient for anyone to understand the concept of the poem. The poet Douglas Malloch wants to tell us that whatever you want to be or whatever you can be ,just be the best one in that field.

The poet starts the poem by giving examples of nature. He says if you are not able to be pine on the top of the hill then just try to be the scrub which are little elevated grasses but you must be the best scrub by the side of the stream. For example if you can't be the boss of an office then just you try to be a worker but be the best worker of that office. The poet again teaches us to be the bush if we can't be strong like a tree. If also we can't be a bush then a bit of little grass.

Douglas Malloch says us to be the happiest . He gives example of music. He says that if we can't be the good music then be the cheerful bass in the lake. All of us cannot be the captain because the crew field is also waiting for someone. If all are captain by themselves then every thing just would become a mess.

There is some work for everyone to do in this world. There is no one who has no work. There is a big work to do but the people to execute on it is less The job which is to be completed is not very far away. If we cannot be the highway but we can be the trail. If we are not be able to be a burning sun then we can be the star. The size doesn't matter of winning and losing , what matter is the best whatever you are.

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Emf Current Electricity Physics Class 10

Emf: Emf is defined as work done per unit charge in taking a positive charge through the complete circuit ( the circuit outside the source (cell) and inside of the source. emf is represented by greek letter ε

If W is the work done when a test charge of q₀ is taken through the complete circuit of a cell with a external resistance or lamp etc. Then emf of the cell is : ε=W/q₀
For detail watch the video.
If you have any confusion then ask below in the comment box.

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If I were a Cloud Essay In Hindi | यदि मै बादल होता निबंध

मैने कल रात एक सपना देखा, कि मैं एक बादल था। मैं वाष्प से बना था और मुझ में पानी था। मैं पानी से बोझिल था, और बौछार करने के लिए इंतजार कर रहा था ।

मै अपने आपको किसी भी आकार भें ढाल सकता था । थोड़ी ही देर में मै कुत्ता बन गया जो मुंह मैं एक हड्डी लिया हुआ था । बच्चे मेरी तरफ उंगली उठाकर कह रहे थे कि देखो बादल कुत्ता जैसा दिखता है।

दूसरे दिन मैं अपने आपको उपयोगी बना दिया। मैं ऐसी जगह गया जहां पर लोग सूखे से फैली भुखमरी से मर रहे थे । मैने वहां के लोगों में क्रोध और दुःख दोनों देखा। लोग मेरे इंतजार में प्रार्थना कर रहे थे। थोड़ी ही देर में मैं वहां छा गया और अपने आपको पूरी तरह खोल दिया | वहां की जमीन को मैने बारिश से सराबोर कर दिया । लोग बहुत खुश हो गए। वो ऊपरवाले की प्रार्थना करने लगे और खुशी से नृत्य करने लगे ।

दूसरे दिन मैं ऐसी जगह था , जहां चारो तरफ पानी ही पानी था । लोगों को मैं डूबते हुए देख रहा था । मै सोचा शायद मेरे मां बाप ने ऐसा किया था । क्योंकि के इन मनुष्यों के प्रकृति के विरुद्ध कार्यो से बहुत नाराज थे। मै चुपचाप उन्हें डूबते हुए और उन्हें उनके पापों के कारण भुगतते हुए देख रहा था । मैं देखता रहा कि मनुष्य किस तरह भिन्न है कहीं पर दुखी है और कहीं पर खुश है। जो भी हो मैं उन्हें खुश देखना चाहता था थोड़ी ही देर में मैंने एक सुन्दर इंद्रधनुष बना दिया जिसे देखकर वे सब बहुत खुश हो गए और में भी उन्हें खुश करके आनन्द लेता रहा ।

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Resistance Current Electricity Physics Class 10

Resistance: Resistance of a conductor is the opposition offered by the conductor to the flow of current through it.

Resistances are of two type fixed resistance and variable resistance.

Reason of resistance: The resistance is due to collision of moving electrons while moving from negative terminal to positive terminal. In this process when electrons collide with positive ions , few electrons drift away and do not reach to the positive terminal. Because of this drifted electrons the conductance of the conductor decreases and therefore resistance results in this process.

Conductance = 1 / resistance

R_t=R₀ ( 1+ α t) ohm.
where t = T_t - T ₀
Where R_t = Resistance at temperature t ⁰C
R₀ = Resistance at temperature 0⁰C
α = temperature Co-efficient of resistance of a particular conductor.

Temperature Co-efficients (α)
Conductor Material	Temp. Co-efficent	Unit
Copper	4.041 x 10-3	Ohm-m
Aluminium	4.308 x 10-3	Ohm-m

Resistance formula from the relation of potential difference and current is given below.
Resistance = Potential difference / Current
R = V / I VA^-1
This unit VA^-1 is named as Ohm.

From the power equation we can write the resistance formula as
R = W / I²

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Potential Difference Current Electricity Physics Class 10

Potential Difference: Potential difference between two terminal of a conductor is the work done while carrying unit positive charge from one terminal to the other terminal.

Unit of the potential difference is volt.
V = W / Q
or 1 V = 1JC^-1
1 Volt is equal to 1 Jouls/coulomb.
and W = QV
Above equations should be memorized
Potential difference is measured by voltmeter.

If the V_A and V_B be the potential of the two end of a conductor then we can write
V_A - V_B = W /Q

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Essay On Natural Disaster in Hindi | प्राकृतिक आपदा पर निबंध

प्राकृतिक आपदा पर निबंध

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प्रकृति द्वारा जो आपदा आती है वह बहुत ही भाया वह होती है । इसका आकार बहुत बड़ा होता है। अनेक आपदाओं में से बाढ़ और भूकंप बहुत बार होता रहता है। हाल ही में चेन्नई में बाढ़ आया जो दक्षिण भारत को अस्तव्यस्त करके रख दिया ।

इसका प्रभाव मानव जीवन पर इस तरह हुआ कि मानो जीवन रुक गया है। घरों का पहला तल्ला पूरा पानी में डूब गया । ट्रेन बस वायुसेवा टेलीफोन ए टी एम बैकिंग आदि एकदम बन्द हो गया था । सबसे भयानक है टेलीफोन सेवा का बन्द होना। क्योंकि सूचनाए मिलना बन्य हो जाती है। किसी तरह सरकार की सहायता से बहुत लोगों की जान बचाई जा सकी । फिर भी अधिक लोगों की मृत्यु हो गई । इन सभी प्राकृतिक आपदाओं से हमें सीखना होगा कि किस प्रकार प्रकृति पर बिना कारण के बोझना डालें। नहीं तो प्रकृति का असंतुलन मनुष्य पर बहुत भारी पड़ेगा । हमें प्रकृति का संतुलन बनाए रखने के उपाय सोचने चाहिए । ऐसे कार्यो को नहीं करना चाहिए जिससे प्रकृति गुस्से में आए और बड़ा सर्वनाश कर जाए ।

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Concept of Current of Current Electricity Physics For Class 10

Current (I) : Current can be defined as rate of flowing of charge (Q).
i.e
I= Q/t
where Q= Charge in coulumb
I = current in Ampere
t= Time in second.

1 Ampere is the charge flowing through a conductor in 1 second.
Q= I x T Amp-Sec

In an ionised electrolyte charged ions flow from one plate to another. For example negative ions flow from cathode to anode and positive ions flow from anode to cathode.

charge of 1 e = 1.6x10^-19 Coulomb
or 6.25x10¹⁸ electrons= 1 coulomb

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Measurement of Length Concept of List Count Limitation Description Precaution Physics Class 9

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