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# Notes | EduRev

## NEET : Notes | EduRev

The document Notes | EduRev is a part of the NEET Course Physics 28 Years Past year papers for NEET/AIPMT Class 11.
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Q 1. Increase in temperature of a gas filled in a container would lead to:    
A: Increase in its mass
B: Increase in its kinetic energy
C: Decrease in its pressure
D: Decrease in intermolecular distance
Ans:
B
Solution: Increase in temperature would lead to the increase in kinetic energy of gas (assuming far as to be ideal) as Q 2. At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth's atmosphere ? (Given: Mass of oxygen molecule (m) = 2.76 × 10–26 kg Boltzmann's constant kB = 1.38 × 10–23 J K–1):-    
A: 2.508 × 104 K
B: 8.360 × 104 K
C: 5.016 × 104 K
D: 1.254 × 104 K
Ans:
B
Solution: Q 3. The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T(Kelvin) and mass m, is:-    
A: B: C: D: Ans:
A
Solution: Kinetic energy of thermal neutron with equilibrium Q 4. A gas mixture consists of 2 moles of O2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is:-    
A: 15 RT
B: 9 RT
C: 11 RT
D: 4 RT
Ans:
C
Solution: Q 5. The molecules of a given mass of a gas have r.m.s. velocity of 200 ms-1 at 27°C and 1.0 x 10-5 Nm-2 pressure. When the temperature and pressure of the gas are respectively, 127°C and 0.05 x 105Nm2, the r.m.s. velocity of velocity of its molecules in ms-1 is;    
A: 100 / 3
B: 100 √2
C: 400 / √3
D: 100√2 / 3
Ans:
C
Solution:
It is given that,
vrms = 200 m/s
T1 = 300 K
P1 = 105 N/m2
rms velocity of gas molecules, For two different cases, It is given that,
vrms = 200 m/s
T1 = 300 K
P1 = 105 N/m2
rms velocity of gas molecules, For two different cases, Q 6. The ratio of the specific heats in terms of degrees of freedom (n) is given by:    
A: B: C: D: Ans:
D
Solution:  This fits into the pattern , where n is the number of the degrees of freedom

Q 7. The mean free path of molecules of a gas,(radius ‘r’) is inversely proportional to:    
A: r
B: √r
C: r3
D: r2
Ans: D

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