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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following reasons the "Golghar" of Patna city was built?1. For the storage of grains2. For the stay of soldiers3. As a fort4. None of these |
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Answer» Correct Answer - Option 1 : For the storage of grains The correct answer is For the storage of grain.
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| 2. |
Identify the state with which Telangana does NOT share its boundary.1. Chhattisgarh2. Odisha3. Karnataka4. Maharashtra |
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Answer» Correct Answer - Option 2 : Odisha The correct answer is Odisha Telangana does not share its boundary with the state of Odisha.
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| 3. |
(a) disposal of unburnt corpses into water(b) discharge of effluents from electroplating industries(c) washing of clothes(d) immersion of ashes |
| Answer» (a) disposal of unburnt corpses into waterThe right answer is (a) disposal of unburnt corpses into water. | |
| 4. |
Static Equilibrium |
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Answer» Static equilibrium refers to the physical state of a system, in which the components of the system are at rest and the net force acting on the system should be zero. |
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| 5. |
Consider the following statements about the Physiographic location of Rajasthan:a) There are 4 districts in Rajasthan which touches the international line.b) Sri Ganganagar has the smallest international boundary in the Rajasthan.c) Rajasthan touches 5 states of India which are Punjab, Haryana, U.P., M.P., Maharashtra.d) 10.41% area of India is approximately equal to the area of Rajasthan.Which of the statement/statements given above is/are correct?1. a and b only2. c and d only3. a, b and c only4. a and d only |
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Answer» Correct Answer - Option 4 : a and d only The correct answer is a and d only.
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| 6. |
In which of the following districts has the largest production of Gram (Chana)?1. Hoshangabad2. Vidisha3. Rewa4. Shahdol |
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Answer» Correct Answer - Option 2 : Vidisha The correct answer is Vidisha.
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| 7. |
A scenario is given to you below. Read it and answer the questions that follow: Late one night, a car ran over a pedestrian in a narrow by street and drove away without stopping. A policeman who saw the vehicle leave the scene of the accident reported it moving at very high speed. The accident itself was witnessed by six bystanders. They provided the following conflicting accounts of what had happened: - It was a Toyota and its headlights were turned off; - It was a grey Audi.- It was a red car driven by a woman; - The car was moving at high speed and its headlights were turned off; - The car did have license plates; it wasn’t going very fast; - The car didn’t have license plates; the driver was a man; When the car and its driver were finally apprehended, it turned out that only one of the six eyewitnesses gave a fully correct description. Each of the other five provided one true and one false piece of information. Keeping that in mind, can you determine the following: i) What was the car’s brand? ii) What was the colour of the car? iii) Was the car going fast or slow? iv) Did it have license plates? v) Were its headlights turned on? vi) Was the driver a man or a woman? a) i) -> TOYOTA ; ii) -> GREY ; iii) -> FAST ; iv) -> NO ; v) -> NO ; vi) -> WOMAN b) i) -> AUDI ; ii) -> RED ; iii) -> SLOW ; iv) -> NO ; v) -> YES ; vi) -> WOMAN c) i) -> AUDI ; ii) -> RED ; iii) -> FAST ; iv) -> YES ; v) -> NO ; vi) -> MAN d) i) -> TOYOTA ; ii) -> RED ; iii) -> SLOW ; iv) -> NO ; v) -> NO ; vi) -> MAN |
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Answer» c) i) -> AUDI ; ii) -> RED ; iii) -> FAST ; iv) -> YES ; v) -> NO ; vi) -> MAN |
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| 8. |
What role does the diary play in Anne Frank’s life? |
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Answer» hatred and hopes. The diary was very important to her. She was a teenage girl with latent feelings and aspirations which she could not express to anyone except to her diary. It provided an avenue for her to vent her feelings. To her the diary was her friend and confidant. Anne was always in confinement of the Secret Annexe. She was friendless. Moreover she was not on cordial terms with her mother and sister Margot. She needed to befriend someone who was compassionate to her. The diary provided this need of a friend. She faithfully recorded her feelings in her diary and it helped her to stay composed thoughout her ordeal. She treated her diary as her close – friend and also named it ‘Kitty’ in memory of her estranged dear cat, whom they could not bring it along with them to the Secret Annexe. Anne coped with the problem of isolation and lonliness by writing her feelings in her diary. The diary gave her a much needed sense of security, because she considered it as her greatest friend. She expressed her inner turmoil and thoughts in her diary and pondered for answers, which gave her a certain maturity to her thoughts as she grew up. |
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| 9. |
How did the blacksmith face the ball? What was happening in the terrestrial sphere when the ball was high in the air? |
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Answer» The last man to bat for the village side was the Blacksmith. The Blacksmith had sprained his ankle and limped in great pain. The Baker was his stand – in runner. The Blacksmith took position to bat. He looked around, savagely. He was clearly still in rage, having sprained his ankle. He lashed at the first ball he received and hit it straight up into the air to an enormous height, It seemed that the ball was trying to break Newton’s law of gravitation and hovered for a long time in the air and then began to decend slowly. The Blacksmith forgot his sprained ankle and speedily set out for the other end of the wicket. As he started to run he roared at the Baker, his stand – in runner, to run with him. The baker, who was to run an behalf of the injured Blacksmith, enthusatically began to run along with the Black smith. The two of them collided with Joe, the man batting at the other end in the middle of the pitch and fell down. With their fall, the hopes of the village fell with the resounding fall of their three champions. |
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| 10. |
Why doesn’t Gandhiji term Alexander’s conquests as moral even if others call him great? |
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Answer» According the Gandhiji a moral act depends upon the intention of the doer. The intent of moral action should be good and should be done with good intention. Alexander’s conquests were done only for renown, hence he considers his conquests as an act without any moral. |
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| 11. |
According to Gandhiji when does simple living become moral? |
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Answer» Gandhiji says that an action is moral if it is done voluntarily and without compulsion or fear.Simple living becomes moral when the person, although wealthy, thinks of all the want and misery in the world about him and feels that he ought to live a plain, simple life and not one of ease and luxury. |
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| 12. |
What illustrations does Gandhiji give to justify that all good actions need not be moral acts? |
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Answer» Conventional Behaviour: An example for conventional behaviour is the way we greet each other, which depends on the way people greet each other socially. In that part of the world in western countries, shaking hands is a conventional behaviour, where as greeting with folded hands is followed in our country. A moral act: A moral act must be our own act; must spring from our own will. If we act mechanically, there is no moral content in our act. Such action would be immoral, if we think it proper to act like a machine and do so. For, in doing so, we use our discrimination. We should bear in mind the distinction between acting mechanically and acting intentionally. It may be moral of a king to pardon a culprit. But the messenger bearing the order of pardon plays only a mechanical part in the king’s moral act. But if the messenger were to bear the king’s order, considering it to be /his duty, his action would be a moral one. It is not enough that an act done by us is in itself good; it should have been done with the intention to do good. That is to say, whether an act is moral or otherwise depends upon the intention of the doer. Two men may have done exactly the same thing; but the act of one may be moral, and that of the other the contrary. Take, for instance, a man who out of great pity feeds the poor and another who does the same, but with the motive of winning prestige or with some such selfish end. Though the action is the same, the act of the one is moral and that of the other nonmoral. There is no morality in living a simple and unpretentious life if I have not the means to live otherwise. But plain, simple living would be moral if, though wealthy, I think of all the wants and miseries in the world about me- and feel that I ought to live a plain, simple life and not one of ease and luxury. Likewise it is only selfish, and not moral, of an employer to sympathize with his employees or to pay them higher wages lest they leave him. It would be moral if the employer wished well of them and treated them kindly realizing how he owed his prosperity to them. This means that for an act to be moral it has to be free from fear and compulsion. |
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| 13. |
When, according to Gandhiji, can we regard ourselves to have stepped on the moral road? |
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Answer» When we all care only for what our conscience says. |
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| 14. |
The temperature of a body rises by 2°C.What is the corresponding rise on the Fahrenheit and Kelvin scales? |
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Answer» (a) Since 100 divisions on Celsius scale =180 divisions on the Fahrenheit scale 2 division on Celsius scale ∴ 2 division on Celsius scale = 1.80 / 1.00 × 2 = 3.6 divisions in the Fahrenheit scale. For 2°C rise corresponding rise in Fahrenheit = 3.6 F (b) Since 100 divisions in the Celsius scale = 100 divisions in the Kelvin scale 2 division on Celsius scale = 100 / 100 × 2 = 2 division on Kelvin scale For 2°C rise corresponding rise in Kelvin is 2 K. Given : TC = 2° c TF = ? Tk = ? Using formula In farhrenhiet TF = \(\cfrac95\) TC + 32 TF = \(\cfrac95\) x 2 + 32 TF = 3.6 + 32 TF = 35.6° F In kelvin value TK = TC + 273 TK = 2° + 273 TK = 275° K |
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| 15. |
Match the following:. Ryot. Mahal. Nij. Ryoti |
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Answer» Ryot- Peasant Mahal- Village Nij- Cultivation on planters own land Ryoti- Cultivation on ryots lands |
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| 16. |
Some scrap metal ___ and ___ in the school yard by the evening last Sunday. A) was gathered/heaped B) has been gathered/heaped C) will be gathered/heaped D) had been gathered/heaped E) would be gathered/heaped |
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Answer» Correct option is A) was gathered/heaped |
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| 17. |
WO HUNDRED YEARS ago the square yard was very clean. A) many years B) two week C) two centuries D) a fortnight E) two months |
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Answer» Correct option is C) two centuries |
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| 18. |
The girl ___ in the yard asked me the time. A) play B) to play C) played D) playing E) was playing |
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Answer» Correct option is D) playing |
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| 19. |
Which of the boys ___ in the yard is Ted? A) play B) played C) plays D) is playing E) playing |
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Answer» Correct option is E) playing |
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| 20. |
Two hours ago when the children ___ in the yard a terrible storm ___ . A) were playing / began B) played / began C) were playing / were beginning D) played / were beginning E) play / begins |
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Answer» Correct option is A) were playing / began |
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| 21. |
There was a terrible storm at sea last night and one of the sailors ________. A) floated B) drowned C) dived D) sank E) swam |
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Answer» Correct option is B) drowned |
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| 22. |
67.2 L of Carbon dioxide gas is filled in a cylinder at STP. a. Calculate the mass of CO2 present in it. (Atomic mass- C = 12, O = 16) b. Calculate the number of molecules present in the cylinder. |
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Answer» a. Molecular mass of CO2 =12 × 1+16 × 2 = 12 + 32 = 44 No. of moles in 67.2L CO2 at STP = \(\frac{67.2L}{22.4L}\) = 3 b. 3 × 6.022 × 1023 |
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| 23. |
A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by 20°C is :[Given that R = 8.31 J mol–1 K–1 ](1) 748 J (2) 350 J (3) 374 J (4) 700 J |
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Answer» Correct option (1) 748 J Explanation: Q = nCvdT = 748 Joule |
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| 24. |
8gm `H_(2)32gm O_(2)` is allowed to recant to form water then which of the following statement is correct ?A. `O_(2)` is limiting in reagentB. `O_(2) ` is reagent in excessC. `H_(2)` limiting reagentD. 40g water is formed |
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Answer» Correct Answer - A `{:(,2H_(2)+,O_(2),to,2H_(2)O),(,4gm,32gm,,36gm),(given,8gm,32gm, ,):}` Hence, `O_(2)` is limiting reagent |
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| 25. |
Three vectors `veca,vecb` and `vecc` satisfy the relation `veca.vecb=0` and `veca.vecc=0`. The vector `veca` is parallel toA. `vecC`B. `vecB`C. `vecBxx vecC`D. `vecB*vecC` |
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Answer» Correct Answer - 3 `vecr= 1cosalpha hati+ 1cos beta hatj+ 1cos gammahatk = (sqrt3)/(2) hati+ (1)/(2) hatj+0hatk ` |
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| 26. |
बंसत फूलदेई का त्योहार लेकर आता हैं। देर शाम तक बच्चे फूल चुनते हैं। इन फूलों को रिंगाल से बनी खास तरह की टोकरियों में रखा जाता हैं। टोकरियों को रात भर पानी से भरी गागरों के ऊपर रख जाता है ताकि वो सुबह तक मुरझा न पाएँ।फूलदेई को बच्चों का त्योहार क्यों कहा गया है? |
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Answer» इस त्योहार में सारे काम बच्चे करते हैं। बडों की भूमिका केवल सलाह देना है। इसलिए फूलदेई बच्चों का त्योहार कहा गया है। |
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| 27. |
फूलदेई त्योहार के दिन सुबह से बच्चे क्या करते हैं? |
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Answer» बच्चे टोलियाँ बनकर गाँव-भर घूमते हैं। पिछली शाम चुने फूलों को घरों की देहरियों पर सजाते हैं। |
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| 28. |
फूलदेई के त्योहार के सिलसिले में बच्चे पहले क्या किया करते हैं? |
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Answer» बच्चे देर शाम तक फूल चुनते हैं और इन फूलों को रिंगाल से बनी खास तरह की टोकरियों में रखते हैं। |
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| 29. |
उत्तराखंड के हिमालयी अंचल में फूलदेई को बच्चों का सबसे बड़ा त्योहार मानते हैं। क्यों? |
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Answer» फूलदेई के त्योहार में बच्चों की अहम भूमिका रहती है। इसमें बड़ों की भूमिका केवल सलाह देने तक सीमित रहती है। फूलदेई का त्योहार मनाने के लिए पहले बच्चे फूल चुनते हैं। टोकरियों में रखते हैं। सुबह बच्चे गाँव भर घूमकर घरों की देहरियों को फूलों से सजाते हैं। घरवाले बच्चों को चावल, गुड़, आदि दक्षिणा में देते हैं। इक्कीस दिन तक इसी प्रकार सामग्रियाँ इकट्ठी की जाती हैं। इन्हीं चीज़ों से अंतिम दिन सामूहिक भोज बनाते हैं। ये सारे काम बच्चे ही करते हैं। इसलिए इसे बच्चों का सबसे बड़ा त्योहार मानते हैं। |
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| 30. |
बसंत मेरे गाँव का बदलते त्योहार बदलते मौसम |
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Answer» हमारे त्योहार और मौसम के बीच घना संबंध है। वेदों में प्रकृति को ईश्वर का साक्षात् रूप मानकर उसके हर रूप की वंदना की गई है। इसके अलावा आसमान के तारों और आकाश मंडल की स्तुति कर उनसे रोग और शोक को मिटाने की प्रार्थना की गई है। ऋतुएँ छह बताई गई हैं – वसंत, ग्रीष्म, वर्षा, शरद्, हेमंत एवं शिशिर । ऋषियों ने ऐसे प्रत्येक ऋतु में प्रत्येक त्योहार और नियम बनाए जिनका पालन करने से व्यक्ति सुखमय जीवन प्यतीत कर सके। वसंत ऋतु में होली, रंग-पंचमी, बसंत पंचमी, नवरात्रि, रामनवमि, हनुमान जयंती और गुरुपूर्णिमा उत्सव मनाए जाते हैं। ग्रीष्म ऋतु में निर्जला एकादशी वट सावित्री व्रत, शीतलाष्टमी, देवशयनी, एकादशी, और गुरुपूर्णिमा त्योहार आते हैं। श्रावण और भाद्रपद वर्षा ऋतु के मास हैं। वर्षा नया जीवन लेकर आती है। यह माह जुलाई-सितंबर में पडता है। इस ऋतु के तीज, रक्षाबंधन और कृष्णजन्माष्टमी सबसे बड़े त्योहार हैं। शरद् ऋतु वातावरण में स्वाच्छता का प्रसार दिखाई पड़ता है। यह ऋतु अकतूबर से नवंबर के बीच रहती है। इस ऋतु के त्योहार हैं – श्राध्द पक्ष, नवरात्रि, दशहरा करवा चौथ । हेमंत ऋतु हिंदु माह के मार्गशीर्ष और पौष मास के बीच रहती है। इस ऋतु में शरीर प्रायः स्वस्थ रहता है। करवा चौथ, धनतेरस, रूप चतुर्दशी दीपावली, गोवर्धन पूजा, भाई दूज आदि त्योहार पडेंगे। शिशिर ऋतु माघ और फाल्गुन के महीने अर्थात् पतझड़ माह में आती है। इस ऋतु में प्रकृति पर बुढ़ापा छा जाता है। इस ऋतु से ऋतुचक्र के पूर्ण होने का संकेत मिलता है। यह 15 जनवरी से पूरे फरवरी माह तक रहती है। इस ऋतु में मकर संक्रांति का त्योहार आता है। इसी ऋतु में फाल्गुन मास कृष्ण चतुर्दशी को महाशिवरात्रि का महापर्व मनाया जाता है। |
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| 31. |
ये वाक्य पढ़ें।( इन फूलों को रिंगाल से बनी खास तरह की टोकरियों में रखा जाता है।)यहाँ फूलों को रिंगाल से बनी खास तरह की टोकरियों में किसके द्वारा रखा जाता है?अब यह वाक्य पढ़ें,(बच्चे इन फूलों को रिंगाल से बनी खास तरह की टोकरियों में रखते हैं।)इन दोनों वाक्यों पर चर्चा करें। |
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Answer» पहले वाक्य में कर्म की प्रमुखता है। इस प्रकार के वाक्य को ‘कर्म वाच्य’ कहते हैं। इसमें कर्म ‘फूल’ है। कर्म वाच्य के वाक्यों की क्रियाएँ कर्म के लिंग-वचन के अनुसार बदलती हैं। लेकिन यहाँ कर्म के साथ ‘को’ परर्सा का प्रयोग हुआ है। इसलिए क्रिया का रूप पुल्लिंग एकवचन में है। दूसरे वाक्य में कर्ता की प्रमुखता है। इसमें कर्ता ‘बच्चे’ है। इस प्रकार के वाक्य को कर्तृवाच्य कहते हैं। कर्तृवाच्य के वाक्यों की क्रियाएँ कर्ता के लिंग-वचन के अनुसार बदलती हैं। |
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| 32. |
i. बसंत फूलदेई का त्योहार लेकर आता है। ii. देर शाम तक बच्चे फूल चुनते हैं। iii. सुबह पौ फटते ही बच्चों की टोलियाँ गाँव भर में घूमती हैं। रेखांकित शब्द क्रिया के किस समय को सूचित करता है? चर्चा करें। |
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Answer» यहाँ आता है, चुनते हैं और घूमती हैं क्रियाएँ क्रिया के वर्तमान काल में होने की सूचना देती हैं। वर्तामान काल में क्रिया के आठ रूप बनते हैं। नीचे की तालिका से उन्हें समझें। |
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| 33. |
The thermochemical equation for solid and liquid rocket fuel are given below : 2Al (s) +1 1/2 O2 (g) →Al2 O3 s ;ΔH= -1667.8 kJ mol-1H2(g) +1/2 O2(g) →H2O(l);ΔH= -285.9 kJ mol-1(a) If equal masses of aluminium and hydrogen are used, which is a better rocket fuel ? (b) Determine ΔH for the reaction :Al2O3(s) 2Al (s) +1 1/2 O2 (g). |
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Answer» (a) From the first given equation, 2 moles of Al (i.e., 2 × 27 g = 54 g) on combustion give heat = 1667.8 kJ ∴1 g of Al on combustion gives heat = (1667.8/54) = 30.9 kJ From the second given equation, 1 mole of H2 (= 2g) on combsution gives heat = 285.9 kJ ∴1 g of H2 on combustion gives heat = (285.9/2) = 142.95 kJ Thus, H2 is a better rocket fuel. (b) Writing the reverse of the first reaction, we have Al2O3 (s)→ 2Al (s)+ 1 1/2 O2 ΔH= +1667.8 kJ mol-1 Thus, for the reaction given in part (b) of the problem, ΔH = + 1667.8 kJ mol–1 |
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| 34. |
An apparatus used to demonstrate phototropism is(1) Luxmeter (2) Solarometer (3) Clinostate (4) Heliotrophic chamber |
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Answer» (4) Heliotrophic chamber |
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| 35. |
The following flow diagram represents the industrial preparation of nitric acid from ammonia. Which of the following options describes the reagents, products and reaction condition ?A. `{:("(p)","(q)","(r)","(s)"),("Catalyst and high pressure","Cool",NO_2,H_2O and O_2):}`B. `{:("(p)","(q)","(r)","(s)"),("Catalyst","Cool",N_2O,HNO_3 and O_2):}`C. `{:("(p)","(q)","(r)","(s)"),("Catalyst and high pressure","High pressure",NO_2,H_2O and O_2):}`D. `{:("(p)","(q)","(r)","(s)"),("High pressure","Catalyst",N_2O_3, HNO_3):}` |
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Answer» Correct Answer - A `4NH_3(g)+5 O_2 (g) underset(850^@C,5 "atmoshphere")overset("platiunum/Rhodium catalyst")to3NO(g)` `4ano(g)+O_2("from air")underset(-25^@C)overset("cool to")hArr 2NO_2(g)` `H_2O + NO_2 +O_2 toHNO_3 +NO` |
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| 36. |
(i) `P+Cl_(2)overset(Delta)toQ` (ii). `Q+H_(2)OtoR+HCl` (iii). `BN+H_(2)OtoR+NH_(3)uarr` (iv). `Q=LiAlH_(4)toS+LiCl+AlCl_(3)` (v). `S+H_(2)OtoR+H_(2)uarr` (vi). `S+NaHtoT` (P,Q,R,S, and T do not represents their chemical symbols) Q. Compound Q has: (i). zero dipole mament (ii) A planar trigonal structure (III) An electron deficient compound (IV) A Lewis base Choose the correct code:A. I,IVB. I,II,IVC. I,II,IIID. I,II,III,IV |
| Answer» Correct Answer - C | |
| 37. |
Observe the following reaction and mention the number which show slowest and rate determine step. |
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Answer» Correct Answer - 4 In free radical substitution reaction alkyl free radical formation is rate determining step. |
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| 38. |
Consider the following set of reaction: `Z=LiAlH_(4)toX+LiF+AlF_(3)` `X+H_(2)OtoY+H_(2)` `X+O_(2)overset(Delta)toB_(2)O_(3)+H_(2)O` Then calculate the total number of boron atoms in one molecule each of compounds X, Y and Z. |
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Answer» Correct Answer - 4 `Z=BF_(3),X=B_(2)H_(6),Y=H_(3)BO_(3)` |
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| 39. |
pH of `3xx10^(-5)` M `CaA_(2)`(aq) solution if `CaA_(2)` dissociates completely in water is [Given : `K_(a)` of `HA=5xx10^(-9)`]. |
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Answer» Correct Answer - 8 `pOH = pK_(b)+log((0.1)/(1))=7-1=6` pH = 14 - 6 = 8 |
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| 40. |
The total number of elements which belongs to representative elements are: (i) Cr (ii) Si (iii) Os (iv) Se (v) Pm (vi) Ba (vii) Y (viii) Pd (ix) Sn (x) Ga |
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Answer» Correct Answer - 6 Area = `pir^(2)` `(A_(1))/(A_(2))=(pi(0.592(n_(1)^(2))/(z_(1)))^(2))/(pi(0.592(n_(2)^(2))/(z_(2)))^(2))implies ((36)/(1)xx(3)/(4))^(2)=3^(6)` x=6 |
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| 41. |
At `25^(@)C` find pH of resultant solution prepared by mixing 50 ml, 0.2 M kA(aq) and 50 ml, 0.2M kB(aq) solution : (given = `K_(a)(HA)=5xx10^(-9), K_(a)(HB)=1.25xx10^(-9)`)A. 3B. 2.5C. 11D. 6 |
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Answer» Correct Answer - D `"pH of "(NaHCO_(3))=(1)/(2)[pKa_(1)+pKa_(2)]` `(1)/(2)[pKa_(1)+pKa_(2)]=9` `pKa_(1)+underset(LR)(pKa_(2))=18` `H_(2)CO_(3)+NaOH rarr NaHCO_(3)` `{:(44,40,,-),(4,0,,40):}` Buffer `rarr pH = pKa_(1)+log.(40)/(4)` `pH=pKa_(1)+log.(40)/(4)` `pH=pKa_(1)+log10` `7.6 = pKa_(1)+1` `pk_(a_(1))=6.6` `18=6.6 + pk_(a_(2))` `pk_(a_(2))=11.4` |
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| 42. |
According to kinetic theory of heat (a) temperature should rise during boiling (b) temperature should fall during freezing (c) at low temperature all bodies are in solid state (d) at absolute zero there is absolutely no vibration of molecules (e) none of the above. |
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Answer» (d) at absolute zero there is absolutely no vibration of molecules (e) none of the above. |
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| 43. |
The condition for the reversibility of a cycle is (a) the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process (b) all the processes, taking place in the cycle of operation, must be extremely slow (c) the working parts of the engine must be friction free (d) there should be no loss of energy during the cycle of operation (e) all of the above (f) none of the above. |
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Answer» (e) all of the above |
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| 44. |
What happens to the image distance in the eye when we increase the distance of an object from the eye? |
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Answer» The size of the eye can change, so the image distance is fixed when we increase the distance if the eye does not change, due to power of accommodation of the eye, focal length of the eye lens is changed, which compensates the increase in object distance. Hence image distance remains fixed and image is formed on the retina of the eye. |
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| 45. |
Why does the sun appear reddish early in the morning? |
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Answer» During sunrise, the light rays coming from the sun have to travel a greater distance in the earth’s atmosphere before reaching our eyes. In this journey, the shorter wave length of lights are scattered out and only longer wavelength are able to reach our eyes. Since blue colour had a shorter wavelength and red colour has longer wave length, the red colour is able to reach our eyes after the atmospheric scattering of light. Therefore the sun appear reddish early in the morning. |
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| 46. |
Why are we not able to see the things clearly when we come out of a dark room? |
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Answer» When we are in dark, pupil size is bigger, as we come out of dark room, its size needs to become smaller. For that time interval person is unable to see. |
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| 47. |
For the following reactions (A) CH3 CH2 CH2 Br + KOH → CH3 -CH + KBr + H2O (B) (CH3)3 CBr + KOH → (CH3)3 COH + KBrWhich of the following statement is correct? (a) (A) is elimination, (B) and (G) are substitution (b) (A) is substitution, (B) and (C) are elimination (c) (A) and (B) are elimination and (C) is addition reaction(d) (A) is elimination, B is substitution and (C) is addition reaction. |
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Answer» (d) (A) is elimination, B is substitution and (C) is addition reaction. |
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| 48. |
Mirrors have been used for ages. It is said that Archimedes used huge mirrors to focus the heat of the sun’s rays on enemy ships to burn them. The same principle is used in solar cookers, where mirrors are used to reflect and focus the sun’s rays on to cooking containers. Astronomers use huge concave mirrors to focus starlight. The mirrors used in telescopes are polished by giving a thin coat of silver or aluminium to the glass. With the telescopes, astronomers can see the heavenly bodies, but even without the telescopes, one can see the moon. A full moon shining overhead is a beautiful sight. But it is also a puzzle, because if the sun and the moon both give the same light, then why is the moonlight more pleasant?The reason is that the moon reflects very little sunlight, in fact, only seven percent of the light it receives The earth reflects about half of the radiation that it receives from the sun Imagine how bright the earth must be looking from the moon! One can even read a book on the moon in the earthlight. However, you do not have to travel to the moon to realize how strong the earth’s light is. Observe the crescent moon soon after all the new moon. The bright crescent is illuminated by the sun. The rest of the moon is illuminated by earthlight. In other words, the light reflected by the earth is falling on the moon. This is being reflected and is strong enough to show the moon faintly. As the crescent increases in size, this effect disappears.Fresh snow is the best reflector of sunlight in nature. As a highly reflective substance, snow dramatically increases UV-B exposure near the Earth’s surface, as it reflects most of the radiation into the atmosphere, where it is then scattered back toward the surface by aerosols and molecules. Fresh snow can reflect as much as 9.4 percent of the incoming UV radiation. The bright light reflected by it can dazzle and harm your eyes Mountaineers, therefore, use dark glasses.1. Fill in the blanks :Mountaineer’s wear ______ while climbing mountains.a. light glassesb. dark lensesc. dark glassesd. light lenses2. Fill in the blanks :The bright light reflected by fresh snow can _______.a. harm our faceb. harm our eyesc. harm our skind. harm our nose3. Why did Archimedes use mirrors to focus the heat of the sun rays?a. Archimedes used mirrors to focus the heat of the sun’s rays on enemy ships to burn them.b. Archimedes used mirrors to focus the heat of the sun’s rays on enemy ships to shoot them.c. Archimedes used mirrors to focus the heat of the sun’s rays on enemy ships to turn them around.d. Archimedes used mirrors to focus the heat of the sun’s rays on enemy ships to vanish them.4. Choose the correct option :The earth reflects ___ of the radiation received from the sun.a. more than Halfb. fullc. about halfd. one - Third5. The principle of focusing sun rays is used in :a. The principle of focusing sun rays is used in Solar panel.b. The principle of focusing sun rays is used in Solar cooker.c. The principle of focusing sun rays is used in Solar lights.d. The principle of focusing sun rays is used in Solar cells.6. The dim part of the crescent moon is lit by :a. The dim part of the crescent moon is lit by Earth light.b. The dim part of the crescent moon is lit by Moonlight.c. The dim part of the crescent moon is lit by Star light. d. The dim part of the crescent moon is lit by Sunlight.7. With the _____, astronomers can see the heavenly bodies.a. periscopeb. telegramc. telescoped. satellite8. Mirrors used in telescopes are polished by which coating?a. Mirrors used in telescopes are polished by Silver or potassium coating.b. Mirrors used in telescopes are polished by brass or Aluminium coating.c. Mirrors used in telescopes are polished by gold or Aluminium coating.d. Mirrors used in telescopes are polished by Silver or Aluminium coating.9. State true or false :It is said that Archimedes used small mirrors to focus the heat of the sun’s rays on enemy ships to burn them.a. Trueb. False10. Fill in the blanks :_____ use huge concave mirrors to focus starlight.a. Artistsb. Astronomersc. Astronautsd. Teachers |
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Answer» 1. c. dark glasses 2. b. harm our eyes 3. a. Archimedes used mirrors to focus the heat of the sun’s rays on enemy ships to burn them. 4. c. about half 5. b. The principle of focusing sun rays is used in Solar cooker. 6. a. The dim part of the crescent moon is lit by Earth light. 7. c. telescope 8. d. Mirrors used in telescopes are polished by Silver or Aluminium coating. 9. b. False 10. b. Astronomers |
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| 49. |
What is meant by the term speciation? List four factors which could lead to speciation. |
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Answer» Speciation is the evolution of reproduction isolation among once interbreeding population factors which can lead to speciation are: (i) Genetic drift: over generations, genetic drift may accumulate which lead to speciation. (ii) Natural selection: Natural selection which may give rise to speciation. (iii) Severe DNA change (iv) A variation may occur which does not allow sexual act between two groups. |
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| 50. |
Solid calcium oxide was taken in a container and water was added slowly to it.i. State the two observations made in the experiment.ii. Write the name and chemical formula of the product formed. |
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Answer» i. a. Calcium oxide reacts vigorously with water producing hissing sound. |
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