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

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 2

The special theory of relativity is based on:

Question # 3

de-Broglies hypthesis was experimentally verified by

Question # 4

There is no way to detect:

Question # 5

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

Question # 6

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

Question # 7

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 8

Momentum is a parameter associated with

Question # 9

The energy of a photon is represented by

Question # 10

When platinum wire is heated, it appears cherry red at

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 15

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

Question # 16

As the light shines on the metal surface, the electrons are ejected

Question # 17

A photon is considered to have

Question # 18

The special theory of relatively treats the problems involving:

Question # 19

Photoelectrons are emitted when ultraviolet light falls on:

Question # 20

An intertial frame of reference is a frame of reference which is

Question # 21

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 22

Electromagnetic radiation or photons interact with matter in

Question # 23

According to the special theory of relativity, a moving clock

Question # 24

0.1 kg mass will be equivalent to the energy

Question # 25

Due to relative motion of observer and the frame of reference of events, time always:

Question # 26

According to the Max plank, energy is redialed or absorbed in

Question # 27

When a position comes close to an electron they annihilate into

Question # 28

Victor de-Brogile received the Nobel prize in physics in

Question # 29

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 30

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
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 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
5 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
6 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
7 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
8 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
9 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
10 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules

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