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

A particle having mass and charge equal to that of an electron is called:

Question # 2

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 3

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

Question # 4

Strictly speaking, the earth is:

Question # 5

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 6

Pair production is the phenomenon in which

Question # 7

Wien's constant is measured in:

Question # 8

The general theory of relativity treats problems involving

Question # 9

Compton shift refers to:

Question # 10

Davision and Germer performed experiment to verify

Question # 11

The mass of an object will be doubled at speed

Question # 12

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

Question # 13

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

Question # 14

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 # 15

A black body is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
2 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
3 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
4 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
5 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
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
8 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
9 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
10 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v

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