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An object is cooled from 75^(@)C to 65^(...

An object is cooled from `75^(@)C` to `65^(@)C` in 2 min in a room at `30^(@)C`. The time taken to cool the same object from `55^(@)C` to `45^(@)C` in the same room is

A

4

B

5

C

6

D

7

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The correct Answer is:
A
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MOTION-HEAT - 1-EXERCISE -2 (Level - I) Objective Problems | JEE Main
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  4. Two sheets of thickness d and 2d and same area are touching each other...

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  5. A bucket full of hot water cools from 75^(@)C to 70^(@)C in time T(1),...

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  6. An object is cooled from 75^(@)C to 65^(@)C in 2 min in a room at 30^(...

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  7. Two thermometers A and B are exposed in sunlight. The bulb of A is pai...

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  8. Which of the following law states that "good absorbers of heat are goo...

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  9. A hot body will radiate maximum energy if its surface is

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  10. There is a black spot on a body. If the body is heated and carried in ...

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  11. We consider the radiation emitted by the human body. Which of the foll...

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  12. Half part of ice block is covered with black cloth and rest half is co...

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  13. If 'p' calorie of heat energy is incident on a body and absorbs 'q' ca...

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  14. If same amount of ice in placed in black and white cloth then ice in b...

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  15. A black body emits radiations of maximum intensity at a wavelength of ...

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  16. The radiant energy from the Sun incident normally at the surface of ea...

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  17. The spectral emissive power E(lambda) for a body at temperature T(1) i...

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  18. Hot coffee is to be taken after 10 minutes it is put into a cup. To ob...

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  19. When placed in air at 30^(@)C, the temperature of a body decreases fro...

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