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CBSE

NEET Physics : Thermodynamics

Multiple Choice Questions

81.

Assertion: For an isothermal process in an ideal gas, the heat obsorbed by the gas is entirely used in the work done by the gas.

Reason: During a process taking place in a system, the temperature remains constant then the process is isothermal.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false

82.

Assertion: Water kept in an open vessel will quickly evaporate on the surface of the moon.

Reason: The temperature at the surface of the moon is much higher than boiling point of water.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

83.

For cyclic process which of the following quantity is zero?

84.

Assertion: During rapid pumping of air in tyres, air inside the tyre is hotter than atmospheric air.

Reason: Adiabatic process occurs at very high rate.

If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true but reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

85.

A certain gas is taken to the five states represented by dots in the graph. The plotted lines are isotherms. Order of the most portable speed ν_p of the molecules at these five states is

ν_{p at 3} > ν_{p at 1} = ν_{p at 2} > ν_{p at 4} = ν_{p at 5}
ν_{p at 1} > ν_{p at 2} = ν_{p at 3} > ν_{p at 4}> ν_{p at 5}
ν_{p at 3} > ν_{p at 2} = ν_{p at 4} > ν_{p at 1} = ν_{p at 5}
insufficient information to predict the result

86.

Graph of specific heat at constant volume for a monoatomic gas is

87.

A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by 62°C, the efficiency of the engine is doubled. The temperatures of the source and sink are

99^oC, 37^oC
80^oC, 37^oC
95^oC, 37^oC
90^oC, 37^oC

88.

The latent heat of vaporisation of a substance is always

greater than its latent heat of fusion
greater than its latent heat of sublimation
equal to its latent heat of sublimation
less than its latent heat of fusion

89.

A slab consists of two layers of different materials of the same thickness and having thermal conductivities K₁ and K₂ are connected in series. The equivalent thermal conductivity of the slab is

$\frac{2 K_{1} K_{2}}{K_{1} + K_{2}}$
$\sqrt{K_{1} K_{2}}$
$\frac{K_{1} K_{2}}{K_{1} + K_{2}}$
K₁ + K₂

90.

For an adiabatic process

ΔS = 0
Δu = 0
Q = 0
W = 0

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Subject

NEET Physics : Thermodynamics

Multiple Choice Questions