ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Question # 2

Which of the following phenomenon proves the particle nature of light

Question # 3

de-Broglies hypthesis was experimentally verified by

Question # 4

The special theory of relativity is based on the

Question # 5

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

Question # 6

Pair production is the phenomenon in which

Question # 7

Electromagnetic radiation or photons interact with matter in

Question # 8

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 9

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

Question # 10

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 11

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

Question # 12

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 13

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

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

Photoelectric effect takes place with a photon of:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
3 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
4 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
5 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
6 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
7 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
8 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
9 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
10 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

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