Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 11 - Thermal Properties of Matter>Exercise>Q 7

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IMPORTANT

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Liquid oxygen at $50 K$ is heated to $300 K$ at a constant pressure of $1 atm$ . The rate of heating is constant. Which of the following graphs represents the variation of temperature with time correctly?

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Important Questions on Thermal Properties of Matter

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 11 - Thermal Properties of Matter>Exercise>Q 1

What will be the ratio of temperatures of the sun and the moon in kelvin, if the wavelengths of their maximum emission radiations rates are

140 Å

and

4200 Å

, respectively?

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 11 - Thermal Properties of Matter>Exercise>Q 2

In which mode of transmission, the heat waves travel along straight line with the speed of light?

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 11 - Thermal Properties of Matter>Exercise>Q 3

One likes to sit under sun in the winter season because,

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 11 - Thermal Properties of Matter>Exercise>Q 1

A body cools from

80^{o} C

to

50^{o} C

in

5

minutes. Calculate the time it takes to cool from

60^{o} C

to

30^{o} C

. The temperature of surroundings is

20^{o} C

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 11 - Thermal Properties of Matter>Exercise>Q 2

In a room where the temperature is

30^{o} C

, a body cools from

61^{o} C

to

59^{o} C

in

4

minutes. The time taken by the body to cool from

51^{o} C

to

49^{o} C

is

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 11 - Thermal Properties of Matter>Exercise>Q 3

Hot water cools from

60 ℃

to

50 ℃

in the first

10 \min

and to

42 ℃

in the next

10 \min

. Then the temperature of the surrounding is

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 11 - Thermal Properties of Matter>Exercise>Q 4

In a room where the temperature is

30 ℃

, a body cools form

61 ℃

to

59 ℃

in 4 min. The time (in minutes) taken by the body to cool from

51 ℃

to

49 ℃

will be

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 11 - Thermal Properties of Matter>Exercise>Q 5

Newton's law of cooling holds good only, if the temperature difference between the body and the surroundings is