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

00:00
Question # 1

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

Question # 2

Practically the quantity v/c is always:

Question # 3

The special theory of relativity is based on:

Question # 4

The existence of position was predicted by Dirace in

Question # 5

The value of threshold frequency for different metals is

Question # 6

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

Question # 7

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 # 8

There is no way to detect:

Question # 9

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

Question # 10

Electromagnetic radiation or photons interact with matter in

Question # 11

Momentum is a parameter associated with

Question # 12

Electromagnetic -radiation means:

Question # 13

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

Question # 14

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

Question # 15

When a platinum wire is heated, it appears white at

Question # 16

A non-inertial frame of reference is one, in which

Question # 17

When platinum wire is heated, it appears cherry red at

Question # 18

The nature of radiations emitted by a hot body depends upon its:

Question # 19

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

Question # 20

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

Question # 21

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 22

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

Question # 23

S.I. unit of planks constant is

Question # 24

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 25

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

Question # 26

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

Question # 27

When a platinum wire is heated, it appears dull red at about

Question # 28

Absolute motion cannot be detected

Question # 29

de-Broglies hypthesis was experimentally verified by

Question # 30

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
2 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)
3 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
4 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
5 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
6 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
7 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
8 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
9 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
10 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

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