Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 2

EASY

11th Maharashtra Board

IMPORTANT

Earn 100

Explain the term thermal resistance. State its SI unit arid dimensions.

Important Questions on Thermal Properties of Matter

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 2

How heat transfer occurs through radiation in absence of a medium?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 2

Explain Newton's law of cooling.

MEDIUM

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 2

What is thermal stress? Give an example of disadvantages of thermal stress in practical use?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 2

Which materials can be used as thermal insulators and why?

MEDIUM

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

A glass flask has volume

1 \times 10^{- 4} m^{3}

• It is filled with a liquid at

30 ° C

. If the temperature of the system is raised to

100 ° C

, how much of the liquid will overflow. (Coefficient of volume expansion of glass is

1.2 \times 10^{- 5} (° C)^{- 1}

while that of the liquid is

75 \times 10^{- 5} (° C)^{- 1}

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

Which will require more energy, heating a

2.0 k g

block of lead by

30 K

or heating a

4.0 k g

block of copper by

5 K

? (

s_{l e a d} = 128 \frac{J}{K g \cdot K, s_{c o p p e r} = 387 \frac{J}{K g \cdot K}}

)

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

Specific latent heat of vaporization of water is

2.26 \times 10^{6} \frac{J}{K g}

. Calculate the energy needed to change

5.0 g

of water into steam at

100 ° C

MEDIUM

11th Maharashtra Board

IMPORTANT

Physics>Chapter 7 - Thermal Properties of Matter>Exercises>Q 3

A metal sphere cools at a rate of

0.05 \frac{° C}{s}

when its temperature is

70 ° C

and at the rate of

0.025 \frac{° C}{s}

when its temperature is

50 ° C

. Determine the temperature of the surroundings and find the rate of cooling when the temperature of the metal sphere is

40 ° C