Match Column - I and Column - II and choose the correct match from the given choices. Column - I Column - II (A) Root mean square speed of gas molecules ( P ) 1 3 n m v 2 (B) Pressure exerted by ideal gas Q 3 R T M (C) Average kinetic energy of a molecule R 5 2 R T (D) Total internal energy of 1 mol of a diatomic gas S 3 2 k B T

( A ) - ( Q ) , ( B ) - ( P ) , ( C ) - ( S ) , ( D ) - ( R )

( A ) - ( R ) , ( B ) - ( P ) , ( C ) - ( S ) , ( D ) - ( Q )

( A ) - ( Q ) , ( B ) - ( R ) , ( C ) - ( S ) , ( D ) - ( P )

( A ) - ( R ) , ( B ) - ( Q ) , ( C ) - ( P ) , ( D ) - ( S )

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An ideal gas is compressed to half of its initial volume by means of several processes. Which of the process results in the maximum work done on the gas?

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Questions featured in Previous Year Papers on Heat & Thermodynamics

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IMPORTANT

NEET Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 11

Match Column - I and Column - II and choose the correct match from the given choices.

Column - I	Column - II
(A) Root mean square speed of gas molecules	$(P) \frac{1}{3} n m v^{2}$
(B) Pressure exerted by ideal gas	$(Q) \sqrt{\frac{3 R T}{M}}$
(C) Average kinetic energy of a molecule	$(R) \frac{5}{2} R T$
(D) Total internal energy of $1 mol$ of a diatomic gas	$(S) \frac{3}{2} k_{B} T$

MEDIUM

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IMPORTANT

NEET Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 61

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?

HARD

NEET

IMPORTANT

NEET Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 116

Three rods of same length are arranged to form an equilateral triangle. Two rods are made of the same material of coefficient of linear expansion

α_{1}

and the third rod which forms the base of the triangle has coefficient of expansion

α_{2}

. The height of the triangle will remain the same at all temperatures if

\frac{α_{1}}{α_{2}}

is nearly,

EASY

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IMPORTANT

NEET Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 31

The two-metre scales, one of steel and the other of aluminium agree at

20 ° C

. The ratio of aluminium

(in cm)

to steel

(in cm)

0 ° C

(α

for steel is

1.1 \times 10^{- 5} ° C^{- 1}

and for aluminium is

2.3 \times 10^{- 5} ° C^{- 1})

EASY

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IMPORTANT

NEET Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 34

The average energy of molecules in a sample of oxygen gas at

300 K

are

6.21 \times 10^{- 21}

J .

The corresponding values at

600 K

are

EASY

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IMPORTANT

NEET Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 37

A gas at state $A$ changes to state $B$ through path $I$ and $II$ shown in figure. The change in internal energy is $Δ U_{1}$ and $Δ U_{2}$ , respectively. Then

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HARD

NEET

IMPORTANT

NEET Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 99

A coffee maker makes coffee by passing steam through a mixture of coffee powder, milk and water. If the steam is mixed at the rate of

50 g

per minute in a mug containing

500 g

of mixture, then it takes about

t_{0}

seconds to make coffee at

70 ° C

when the initial temperature of the mixture is

25 ° C

. The value of

t_{0}

is close to (ratio of latent heat of evaporation to specific heat of water is

540 ° C

and specific heat of the mixture can be taken to be the same as that of water)

HARD

NEET

IMPORTANT

NEET Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 115

A metallic block of mass

20 kg

is dragged with a uniform velocity of

0.5 {ms}^{- 1}

on a horizontal table for

2.1 s

. The coefficient of static friction between the block and the table is

0.10

. What will be the maximum possible rise in temperature of the metal block, if the specific heat of the block is

0.1 CGS

unit? Assume

g = 10 {ms}^{- 2}

and uniform rise in temperature throughout the whole block. [Ignore absorption of heat by the table]

An ideal gas is compressed to half of its initial volume by means of several processes. Which of the process results in the maximum work done on the gas?

Questions featured in Previous Year Papers on Heat & Thermodynamics

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