List of top Physics Questions on Thermodynamics asked in NEET (UG)

Two gases A and B are filled at the same pressure in separate cylinders with movable pistons of radii \(r_A\) and \(r_B\) respectively. On supplying an equal amount of heat to both the cylinders, their pressures remain constant and their pistons are displaced by 16 cm and 9 cm respectively. If the change in their internal energies is the same, then the ratio \(r_A / r_B\) is:
Water is used as a coolant in a nuclear reactor because of its
The value of electric potential at a distance of 9 cm from the point charge \(4 \times 10^{-7} \, \text{C}\) is
\[ \text{Given} \, \frac{1}{4 \pi \epsilon_0} = 9 \times 10^9 \, \text{N m}^2 \text{C}^{-2} \]
According to the law of equipartition of energy, the number of vibrational modes of a polyatomic gas of constant \(\gamma = \frac{C_P}{C_V}\) is (\(C_P\) where \(C_V\) are the specific heat capacities of the gas at constant pressure and constant volume, respectively):
A thermodynamic system is taken through the cycle abcda. The work done by the gas along the path bc is :
A thermodynamic system is taken through the cycle abcda
A U tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is
A U tube with both ends open to the atmosphere, is partially filled with water
Thermodynamic processes are indicated in the following diagram.
Thermodynamic processes are indicated in the following diagram.
Match the following
Column-1Column-2
P.Process Ia.Adiabatic
Q.Process IIb.Isobaric
R.Process IIIc.Isochoric
S.Process IVd.Isothermal
A Carnot engine having an efficiency of \(\frac {1}{10}\) as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is
A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be
A thermodynamic system undergoes cyclic process ABCDA as shown in Fig. The work done by the system in the cycle is:
thermodynamic system undergoes cyclic process ABCDA