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

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

Question # 2

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

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 # 5

Pair production is the phenomenon in which

Question # 6

The energy of the 4th orbit in hydrogen atom is

Question # 7

According to the special theory of relativity, time is

Question # 8

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 9

The unit of work function is:

Question # 10

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

Question # 11

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

Question # 12

The special theory of relatively treats the problems involving:

Question # 13

Momentum is a parameter associated with

Question # 14

Wien's constant is measured in:

Question # 15

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
2 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 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
4 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
5 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
6 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
7 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
8 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
9 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
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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