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NEET Physics : Thermodynamics

Multiple Choice Questions

51.

A lead ball at 30°C is dropped from a height of 6.2 km. The ball is heated due to the air resistance and it completely melts just before reaching the ground. The molten substance falls slowly on the ground. If the specific heat of lead = 126 Jkg^-1 ^oC^-1 and melting point of lead= 130°C and suppose that any mechanical energy lost is used to heat the ball, then the latent heat of fusion of lead is

2.4 × 10⁴ J Kg^-1
3.6 × 10⁴ J Kg^-1
7.6 × 10² J kg^-1
4.94 × 10³ J kg^-1

52.

1 kg of water is converted into steam at the same temperature and at 1 atm (100 kPa). The density of water and steam are 1000 kgm^-3 and 0.6 kgm^-3 respectively. The latent heat of vaporisation of water is 2.25 x 10⁶ J kg^-1, What will be increase in energy?

3 × 10⁵ J
4 × 10⁶ J
2.08 × 10⁶ J
None of these

53.

The given p-V diagram shows gases during adiabatic process. Plots 1 and 2 should correspond respectively to

He and O₂
O₂ and He
He and Ar
O₂ and N₂

54.

When you make ice cubes, the entropy of water

does not change
increases
decreases
may either increase or decrease depeding on the process used

55.

A diatomic gas (γ = 1.4) does 200 J of work when it is expanded isobarically. Find the heat given to the gas in the process

500 J
700 J
600 J
900 J

56.

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of absolute temperature. The ratio $\frac{C_{P}}{C_{V}}$ for the gas is

$\frac{4}{3}$
2
$\frac{5}{3}$
$\frac{3}{2}$

57.

In Carnot engine efficiency is 40% at hot reservoir temperature T. For efficiency 50%, what will be temperature of hot reservoir?

$\frac{T}{5}$
$\frac{2 T}{5}$
6 T
$\frac{6 T}{5}$

58.

For an adiabatic expansion of a monoatomic perfect gas, the volume increases by 24%. What is the percentage decrease in pressure?

59.

1 mole of an ideal gas at an initial temperature of T K does 6R joule of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, then final temperature of the gas will be

( T - 4 ) K
( T + 4 ) K
( T - 2.4 ) K
( T + 2.4 ) K

60.

One mole of a monoatomic ideal gas undergoes the process A → B in the given p-V diagram. The molar heat capacity for this process is

$\frac{3 R}{2}$
$\frac{13 R}{6}$
$\frac{5 R}{2}$
2R

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Subject

NEET Physics : Thermodynamics

Multiple Choice Questions