KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 72 - 74 of 250

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Question number: 72

» Experimental Skills » Speed of Sound in Air

Appeared in Year: 2012

MCQ▾

Question

The ratio of the speed of sound to the average speed of an air molecule at 300K and 1 atmospheric pressure is close to,

Choices

Choice (4) Response

a.

400

b.

1300

c.

1

d.

300

Question number: 73

» Thermodynamics » Work in Thermodynamic Process and PV Diagrams

Appeared in Year: 2012

MCQ▾

Question

An ideal monatomic gas expands to twice its volume. If the process is isothermal, the magnitude of work done by the gas is Wi. If the process is adiabatic the magnitude of work done by the gas is Wa. Which of the following is true,

Choices

Choice (4) Response

a.

Wa>Wi=0

b.

Wi>Wa>0

c.

Wi=Wa>0

d.

Wi>Wa=0

Question number: 74

» Work, Energy and Power » Elastic and Inelastic Collisions

Appeared in Year: 2011

MCQ▾

Question

An electron collides with free molecules initially in its ground state. The collision leaves the molecules in an excited state that is metastable and does not decay to the ground state by radiation. Let K be the sum of the initial kinetic energies of the electron and the molecule, and P the sum of their initial momenta. Let K’ and P’ represent the same physical quantities after the collision. Then –

Choices

Choice (4) Response

a.

K=K,P=P

b.

K=K,PP

c.

K<K,P=P

d.

K=K,PP

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