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Earn 100

Which of the following is not close to a black body?

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Important Questions on Heat

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General Science for Competitive Exams>Chapter 3 - Heat>EXERCISE>Q 19
A solid cube and a solid sphere of the same material have an equal surface area, both are at the same temperature 120°C, then _____.
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General Science for Competitive Exams>Chapter 3 - Heat>EXERCISE>Q 20
At a given temperature the internal energy of a substance _____.
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General Science for Competitive Exams>Chapter 3 - Heat>EXERCISE>Q 21

Consider two identical iron spheres, one lies on a thermally insulating plate, while the other hangs from an insulatory thread. An equal amount of heat is supplied to the two spheres _____.

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General Science for Competitive Exams>Chapter 3 - Heat>EXERCISE>Q 22
Air conditioner is based on the principle of _____.
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General Science for Competitive Exams>Chapter 3 - Heat>EXERCISE>Q 23
Gases exert pressure on the walls of the container because the gas molecules _____.
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General Science for Competitive Exams>Chapter 3 - Heat>EXERCISE>Q 24
Food in the pressure cooker is cooked faster, as _____.
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General Science for Competitive Exams>Chapter 3 - Heat>EXERCISE>Q 25
A metal sheet with a circular hole is heated. The hole _____.
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General Science for Competitive Exams>Chapter 3 - Heat>EXERCISE>Q 27

Which of the following statement is true?

1. Both A and B are wrong.

2. A and B are correct and B is not the correct explanation of A.

3. A and B are correct and B is the correct explanation of A.

4. A is correct but B is wrong.

A : At high altitude regions the cooking of food becomes difficult.
B : Water boils at a lower temperature when the pressure is low.