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 you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 2

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 3

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 4

The length contraction happens only

Question # 5

S.I. unit of planks constant is

Question # 6

The value of the Stephen's constant for black body radiations is given by

Question # 7

The existence of position was predicted by Dirace in

Question # 8

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 9

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 10

The year when A.H. compton was awarded Nobel Prize is:

Question # 11

Position was discovered by Carl Anderson in

Question # 12

As the light shines on the metal surface, the electrons are ejected

Question # 13

The value of threshold frequency for different metals is

Question # 14

Davision and Germer performed experiment to verify

Question # 15

Newton's law of motion do not hold in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
3 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
4 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
5 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
6 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
7 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
8 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
9 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
10 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference

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