Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 2>Q 14

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A liquid in a beaker has temperature $θ$ at time $t$ and $θ_{0}$ is temperature of surroundings, then according to Newton's law of cooling the correct graph between $\log (θ - θ_{0})$ and $t$ is

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Important Questions on Thermal Properties of Matter

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 2>Q 15

A uniform slab of dimension

10 cm \times 10 cm \times 1 cm

is kept between two heat reservoirs at temperatures

10 ° C

and

90 ° C

. The larger surface areas touch the reservoirs. The thermal conductivity of the material is

0.80 W m^{- 1} ° C^{- 1}

. Find the amount of heat flowing through the slab per minute.

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 2>Q 16

Assuming the Sun to be a spherical body of radius

R

at a temperature of

T K

, evaluate the total radiant power incident of Earth at a distance

r

from the Sun, where,

r_{0}

is radius of earth and

σ

is Stefan's constant.

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 2>Q 17

The steel petrol tank of a car is filled with

30

litres of petrol at

10 ° C

. If

α_{steel}

is

24 \times 10^{- 6} ° C^{- 1}

and

γ_{petrol}

is

9.9 \times 10^{- 4} {}^{\circ}C^{- 1}

, the overflow of petrol at

40 ° C

is,

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 2>Q 18

The densities of wood and benzene at

0 ° C

are

880 kg m^{- 3}

and

900 kg m^{- 3}

, respectively. The coefficients of volume expansion are

1.2 \times 10^{- 3} ° C^{- 1}

for wood and

1.5 \times 10^{- 3} ° C^{- 1}

for benzene. At what temperature will a piece of wood just sink in benzene?

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 2>Q 19

Volume expansion coefficient of a gas at constant pressure equal to:

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 2>Q 20

Two large holes are cut in a metal sheet, as shown below. If this is heated, distance $A B$ and $B C$

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 2>Q 21

The volume of a solid decrease by

0.6 %

, when it is cooled through

50 °C

. If coefficient of linear expansion is,

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Physics Crash Course JEE Main>Chapter 8 - Thermal Properties of Matter>Level 2>Q 22

The coefficient of linear expansion of brass and steel are $α_{1}$ and $α_{2}$ . If we take a brass rod of length $l_{1}$ and steel rod of length $l_{2}$ at $0 ° C$ , their difference in length $(l_{2} - l_{1})$ will remain the same at a temperature if