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

The concept of direction is purely:

Question # 2

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

Question # 3

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 4

According to the special theory of relativity, time is

Question # 5

The idea of quantization of energy was proposed by:

Question # 6

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

Question # 7

The Einstein's changes in length, mass and time are not observed in common life because

Question # 8

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 9

The value of the plank's constant 'h' is given by

Question # 10

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 11

The mass of an object will be doubled at speed

Question # 12

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

Question # 13

Position was discovered by Carl Anderson in

Question # 14

Davision and Germer performed experiment to verify

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
2 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
3 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
4 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
5 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
6 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
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 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
9 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
10 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

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