# Physics – Multiple Choice Questions (MCQ) with Answers

Physics – Multiple Choice Questions (MCQ) with Answers

1-A decrease in the Helmholtz function of a system is equal to:

(A) change in temperature

(B) external work done

(C) change in internal energy

(D) all the above

2-In a gas the transport of momentum gives rise to the phenomenon of:

(A) viscosity

(B) conduction

(C) diffusion

(D) volume

3-Joule-Thomson effect is related to:

(C) isothermal expansion

(D) isothermal compression

4-The specific heat of a solid is 5 cal/g/ºC. Then heat required to raise its temperature by 20 ºC is:

(A) 150 cal

(B) 25 cal

(C) 100 cal

(D) 15 cal

5-P, T are ρ are the pressure, absolute temperature and density of an ideal gas, then:

(A) PT/ρ = constant

(B) Pρ/T = constant

(C) PT ρ= constant

(D) P/ρT = constant

6-For the system of diatomic gas the number of degrees of freedom are:

(A) 2

(B) 4

(C) 5

(D) 6

7-An LCR series ac circuit has the values of the resistance 400 Ω, capacitive reactance 400 Ω and inductive reactance 100 Ω then the total impedance of the circuit:

(A) 200 Ω

(B) 400 Ω

(C) 500 Ω

(D) 800 Ω

8-In an electromagnetic wave, the cross product of electric field E and magnetic field B gives:

(A) amplitude

(B) frequency

(C) velocity

(D) direction of travel

9-If dQ is the amount of heat supplied and dW is the work done, then in isothermal process:

(A) dQ + dW = 0

(B) dQ dW = 0

(C) dW / dQ = 0

(D) None of the above

10-The physical quantity analogous to mass in circular motion is:

(A) moment of inertia

(B) force

(C) weight

(D) angular velocity

11-The value of g is 980 cm/s2. If the unit of length is taken as 1 km and unit of time as 1 minute, then the value of g becomes:

(A) 35.3 km/min2

(B) 36.2 km/min2

(C) 30.3 km/min2

(D) 980 km/min2

12-The escape velocity for a body on the earth is 11.2 km/s. If the radius of the earth is increased 4 times, then the escape velocity would be:

(A) 44.8 km/s

(B) 33.8 km/s

(C) 25.7 km/s

(D) 22.4 km/s

13-Compton effect is experimentally observed for:

(A) visible

(B) ultraviolet

(C) X-rays

(D) γ-rays

14-The e.m.f of a cell is quoted as 1.5V. This means that the cell can supply:

(A) 1.5A of current

(B) 1.5 coulombs of charge

(C) 1.5 Ωresistance

(D) 1.5 joules of energy per coulomb of charge

15-A ray of light is shone onto a prism. The light cannot be:

(A) deviated

(B) dispersed

(C) focused

(D) reflected

16-Cathode rays are:

(A) Beam of atoms moving towards cathode

(B) Beam of electrons emitted by cathode

(C) Is a beam of negatively charged ions moving towards anode

(D) Are electromagnetic waves