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

de-Broglies hypthesis was experimentally verified by

Question # 2

In photoelectric effect the energy of ejected electrons depend on

Question # 3

The idea of quantization of energy was proposed by:

Question # 4

When a position comes close to an electron they annihilate into

Question # 5

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

Question # 6

The concept of direction and position are purely

Question # 7

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

Question # 8

Strictly speaking, the earth is:

Question # 9

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

Question # 10

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

Question # 11

The energy of a photon is represented by

Question # 12

0.1 kg mass will be equivalent to the energy

Question # 13

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

Question # 14

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

Question # 15

The Stephen-Boltzmann law for the black body radiation is given by

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

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 # 20

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

Question # 21

The special theory of relativity treats problems invoving

Question # 22

Position was discovered by Carl Anderson in

Question # 23

Photocell is a device which converts

Question # 24

The energy of photon 'E' is proported to

Question # 25

Converse of pair production is known as

Question # 26

At the temperature, a body emits radiation which is principally

Question # 27

In order to produce pair production, a photon must have a energy

Question # 28

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

Question # 29

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

Question # 30

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 energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
2 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
3 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
4 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
5 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
6 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
7 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
9 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
10 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways

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