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

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 2

The length contraction happens only

Question # 3

The existence of position was predicted by Dirace in

Question # 4

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

Question # 5

The value of threshold frequency for different metals is

Question # 6

When a position comes close to an electron they annihilate into photons such that

Question # 7

The special theory of relativity is based on:

Question # 8

Victor de-Brogile received the Nobel prize in physics in

Question # 9

The special theory of relativity treats problems invoving

Question # 10

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

Question # 11

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 12

Converse of pair production is known as

Question # 13

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 14

The positron was discovered by:

Question # 15

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
2 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
3 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 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
5 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
6 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
7 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
8 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
9 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
10 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer

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