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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 2

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 3

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

Question # 4

An intertial frame of reference is a frame of reference which is

Question # 5

The special theory of relatively treats the problems involving:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

Strictly speaking, the earth is:

Question # 12

The positron was discovered by:

Question # 13

The existence of position was predicted by Dirace in

Question # 14

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 15

The energy of photon 'E' is proported to

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
2 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
3 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
4 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
5 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
6 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
7 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
8 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
9 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
10 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above

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