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A hot body cools from $85 ° C$ to $75 ° C T$ in time $T_{1}$ , from $75 ° C$ to $65 ° C$ in time $T_{2}$ and from $65 ° C$ to $55 ° C$ in time $T_{3}$ , then (temperature of surrounding $= 30 ° C$ )

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Important Questions on Thermal Properties of Matter

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>EXERCISE>Q 19

The temperature and the surface area of a body are

227 ° C

and

0.15 m^{2}

respectively. If its transmitting power is negligible and reflecting power is

0.5

, the thermal power of the body is

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>EXERCISE>Q 20

A body cools by Newton's law of cooling. The surrounding temperature is

25 ° C

. The temperature of the body falls from

60 ° C

50 ° C

10 \min

. The temperature at the end of next

10 \min

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>EXERCISE>Q 21

Assuming the sun to be a spherical body of radius $R$ at a temperature of $T K$ , evaluate the total radiant power, incident on the earth, at a distance $r$ from the sun:

(radius of earth is $r_{0}$ )

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>EXERCISE>Q 24

A black body at

1227 ° C

emits radiations with maximum intensity at a wavelength of

5000 Å .

If the temperature of the body is increased by

1000 ° C,

the maximum intensity will be at

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>EXERCISE>Q 25

Water of volume

2 litre

in a container is heated with a coil of

1 kW

27 ° C

. The lid of the container is open and energy dissipates at the rate of

160 J / s

. In how much time temperature will rise from

27 ° C

77 ° C

(Given specific heat of water is

4.2 km / kg]

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>EXERCISE>Q 26

A black and a yellow body at room temperature are thrown into a furnace at very high temperature. Select the correct statement.

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 1

On the Celsius scale the absolute zero of temperature is at

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 2

A constant volume gas thermometer shows pressure reading of

50 cm

and

90 cm

of mercury at

0 ° C

and

100 ° C

respectively. When the pressure reading is

60 cm

of mercury, the temperature is :-

A hot body cools from 85°C to 75°C T in time T1, from 75°C to 65°C in time T2 and from 65°C to 55°C in time T3, then (temperature of surrounding =30°C)

Important Questions on Thermal Properties of Matter

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A hot body cools from $85 ° C$ to $75 ° C T$ in time $T_{1}$ , from $75 ° C$ to $65 ° C$ in time $T_{2}$ and from $65 ° C$ to $55 ° C$ in time $T_{3}$ , then (temperature of surrounding $= 30 ° C$ )