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At a common temperature, a block of wood...

At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperatures of block of wood and block of metal are

A

Equal to temperature of the body

B

Less than the temperature of the body

C

Greater than temperature of the body

D

Either (b) or (c)

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The correct Answer is:
A
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A block is kept in a room which is at 20^(@)C . To raise the temperature of the block, heat is given to it at a constant rate of 600 watt (using an electric heater). The temperature of the block rises with time as shown in the graph. The slope of the graph at time t = 0 is 3^(@)C s^(-1) . Once the temperature rises to 60^(@)C , the heater is switched off and another heater is switched on to maintain the temperature of the block at 60^(@)C . This new heater supplies heat at a constant rate of 100 watt. Assume that heat capacity of the block remains constant for the range of temperature involved. (a) Explain why the slope of the given graph is decreasing with time. (b) Calculate the heat capacity of the block. (c) If the 100 W heater is also switched off, what will be initial rate of cooling of the block? (d) Assuming that rate of heat loss by the block to the surrounding is proportional to difference in its temperature with surrounding, calculate the heat radiated per second by the block when it was at 30^(@)C .

A cube of mass 1 kg and volume 125cm^2 is placed in an evacuated chamber at 27^@C . Initially temperature of block is 227^@C . Assume block behaves like a block body, find the rate of cooling of block if specific heat of the material of block is 400 J//kg-K .

ERRORLESS -TRANSMISSION OF HEAT-ET Self Evaluation Test
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  4. In a steady state of thermal conduction, temperature of the ends A and...

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  5. Four rods of silver, copper, brass and wood are of same shape. They ar...

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  6. The two opposite faces of a cubical piece of iron (thermal conductivit...

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  7. Wein's constant is 2892xx10^(-6) MKS unit and the value of lambda(m) f...

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  9. The wavelength of maximum intensity of radiation emitted by a star is ...

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  10. Two friends A and B are waiting for another friend for tea. A took the...

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  11. There are two spherical balls A and B of the same material with same s...

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  12. Five identical rods are joined as shown in figure. Point A and C are ...

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  13. We cannot boil water inside the earth's satellite. Explain.

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  14. In the following figure, two insulating sheets with thermal resistance...

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  15. The top of an insulated cylindrical container is covered by a disc hav...

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  16. Figure. Shows two air filled bulbs connected by a U-tube partly filled...

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  17. Two conducting rods A and B of same length and cross-sectional area ar...

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  18. The area of the glass of a window of a room is 10 m^(2) and thickness ...

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  19. The spectrum from a black body radiation is a

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  20. The Wien’s displacement law express relation between

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  21. A black body is heated from 27^(@)C to 127^(@)C. The ratio of their en...

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