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

S.I. unit of planks constant is

Question # 2

The special theory of relativity is based on the

Question # 3

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 4

Strictly speaking, the earth is:

Question # 5

Victor de-Brogile received the Nobel prize in physics in

Question # 6

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 # 7

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

Question # 8

The length contraction happens only

Question # 9

According to the special theory of relativity, a moving clock

Question # 10

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

Question # 11

In photoelectric effect the energy of ejected electrons depend on

Question # 12

According to the Max plank, energy is redialed or absorbed in

Question # 13

Position was discovered by Carl Anderson in

Question # 14

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

Question # 15

The special theory of relativity treats problems invoving

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
2 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
3 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
4 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
5 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
6 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
7 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
8 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
9 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
10 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these

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