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

Which one of the following physical quantities changes with relativistic speed

Question # 2

The concept of direction is purely:

Question # 3

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

Question # 4

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 5

When platinum wire is heated, it appears cherry red at

Question # 6

de-Broglies hypthesis was experimentally verified by

Question # 7

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

Question # 8

With the help of 50 K v electron microscope, a resolution of

Question # 9

There is no way to detect:

Question # 10

Victor de-Brogile received the Nobel prize in physics in

Question # 11

When a platinum wire is heated, it appears orange red at

Question # 12

When a position comes close to an electron they annihilate into

Question # 13

An inertial frame is that frame in which

Question # 14

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 15

Position was discovered by Carl Anderson in

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

0.1 kg mass will be equivalent to the energy

Question # 26

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 27

The existence of position was predicted by Dirace in

Question # 28

Practically the quantity v/c is always:

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
2 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
3 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
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 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
7 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)
8 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
9 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
10 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

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