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

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

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

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

Question # 4

Compton shift refers to:

Question # 5

In photoelectric effect the energy of ejected electrons depend on

Question # 6

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 7

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 8

Photocell is a device which converts

Question # 9

According to the special theory of relativity

Question # 10

The value of threshold frequency for different metals is

Question # 11

The concept of direction is purely:

Question # 12

Davision and Germer performed experiment to verify

Question # 13

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

Question # 14

The energy of the 4th orbit in hydrogen atom is

Question # 15

A black body is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
2 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
3 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
4 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
5 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
6 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
7 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
8 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
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 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature

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