ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

When platinum wire is heated, it appears cherry red at

Question # 2

According to the special theory of relativity

Question # 3

The special theory of relativity is based on:

Question # 4

Position was discovered by Carl Anderson in

Question # 5

The length contraction happens only

Question # 6

The general theory of relativity treats problems involving

Question # 7

Victor de-Brogile received the Nobel prize in physics in

Question # 8

The concept of direction is purely:

Question # 9

There is no way to detect:

Question # 10

A black body is

Question # 11

Photocell is a device which converts

Question # 12

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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 location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 15

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 # 16

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

Question # 17

The special theory of relativity is based on the

Question # 18

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

Question # 19

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

Question # 20

The value of threshold frequency for different metals is

Question # 21

According to the special theory of relativity, time is

Question # 22

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

Question # 23

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 24

A particle having mass and charge equal to that of an electron is called:

Question # 25

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

Question # 26

When a position comes close to an electron they annihilate into

Question # 27

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 28

Electromagnetic -radiation means:

Question # 29

Wave nature of particle was proposed by

Question # 30

Practically the quantity v/c is always:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
2 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
3 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)
4 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
5 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
6 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
7 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
8 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
9 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
10 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these

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