ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 2

Absolute motion cannot be detected

Question # 3

Pair production is the phenomenon in which

Question # 4

When a platinum wire is heated, it appears orange red at

Question # 5

The energy of a photon is represented by

Question # 6

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

Question # 7

The general theory of relativity treats problems involving

Question # 8

According to the special theory of relativity, a moving clock

Question # 9

de-Broglies hypthesis was experimentally verified by

Question # 10

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 11

There is no way to detect:

Question # 12

Compton was awarded Nobel prize in physics in

Question # 13

If a material object moves with the speed of light 'C' its mass becomes

Question # 14

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

Question # 15

When a platinum wire is heated, it appears dull red at about

Question # 16

The concept of direction and position are purely

Question # 17

Electromagnetic -radiation means:

Question # 18

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

Question # 19

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

Question # 20

Wien's constant is measured in:

Question # 21

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 22

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 23

The value of threshold frequency for different metals is

Question # 24

The special theory of relativity is based on the

Question # 25

Newton's law of motion do not hold in

Question # 26

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

Question # 27

Position was discovered by Carl Anderson in

Question # 28

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 29

When a platinum wire is heated, it appears yellow at

Question # 30

If a body reaches a speed equal to the speed of light, then its mass will became

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
2 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
3 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
4 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
5 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
6 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
7 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
8 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
9 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
10 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson

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