InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The capacity of a body to do work is called (a) work out (b) energy (c) exercise |
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Answer» Correct option is (b) energy |
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| 52. |
When something burns energy is released in the form of ………….. (a) heat (b) rain (c) cold |
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Answer» Correct option is (a) heat |
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| 53. |
When petrol or diesel burns in a motor vehicle, …………… gets released. (a) fire (b) fuel (c) energy |
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Answer» Correct option is (c) energy |
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| 54. |
Coal, diesel, CNG, LPG, petrol are all substances from which energy is obtained in form of (a) heat (b) rain (c) cold |
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Answer» Correct option is (a) heat |
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| 55. |
When a person or vehicle moves, heat energy gets converted into ……. (a) electricity (b) rain (c) motion |
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Answer» Correct option is (c) motion |
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| 56. |
Name some substance from which energy is obtained. |
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Answer» Coal, diesel, CNG, LPG, petrol are all substances from which energy is obtained. |
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| 57. |
Why should we find alternate sources of energy? |
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Answer» Stores of coal and mineral oil on earth are very limited and fast depleting therefore we must find alternate sources of energy. |
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| 58. |
What’s the solution?We need to make a sherbet quickly for some guests. But we only have sugar candy in the house. |
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Answer» We can pound sugar candy into a fine powder. When the powder is fine, it will quickly dissolve in water. Therefore we can make sherbet quickly. |
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| 59. |
What’s the solution?We need to rub salt on a corncob but only salt crystals are available. |
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Answer» We can pound salt crystals. Either we can use mortar pestle or we can also crush the crystals of salt in a grinder. Such powdered salt can be easily applied on the corncob. |
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| 60. |
Why do tablets of camphor decrease in size day by day ? |
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Answer» Tablets of Camphor are in solid state. Camphor has a property to turn into gaseous state directly from a solid state. Therefore, camphor decreases in size gradually. One can also notice the fragrance of camphor as it turns into vapour. |
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| 61. |
Why do tablets of camphor decrease in size day by day? |
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Answer» Camphor particles present in the tablets escape by getting converted directly to gaseous state. Therefore the tablets of camphor decrease in size day by day. |
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| 62. |
Why did the chalk become smaller in size after writing on the board? |
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Answer» When we wrote on the board the pieces of chalk stick to board, therefore the chalk became smaller in size. |
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