ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 2

The unit of work function is:

Question # 3

In order to produce pair production, a photon must have a energy

Question # 4

The Einstein's changes in length, mass and time are not observed in common life because

Question # 5

the dilation of time applies to the timing processes which are:

Question # 6

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 7

Strictly speaking, the earth is:

Question # 8

The Stephen-Boltzmann law for the black body radiation is given by

Question # 9

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 10

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 11

Wave nature of particle was proposed by

Question # 12

When the atomic particle are moving with velocities approaching that of light:

Question # 13

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 14

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 15

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
2 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
3 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
4 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
5 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
6 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
7 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
8 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
9 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
10 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity

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