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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

The special theory of relativity treats problems invoving

Question # 2

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

Question # 3

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 4

Compton was awarded Nobel prize in physics in

Question # 5

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

Question # 6

An inertial frame is that frame in which

Question # 7

Compton shift refers to:

Question # 8

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

Question # 9

The energy of the 4th orbit in hydrogen atom is

Question # 10

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

Question # 11

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

Question # 12

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 13

Photocell is a device which converts

Question # 14

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

Question # 15

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

Question # 16

At the temperature, a body emits radiation which is principally

Question # 17

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 18

The mass of an object will be doubled at speed

Question # 19

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

Question # 20

de-Broglies hypthesis was experimentally verified by

Question # 21

Davision and Germer performed experiment to verify

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

Pair production is the phenomenon in which

Question # 26

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 27

When a position comes close to an electron they annihilate into

Question # 28

Wien's constant is measured in:

Question # 29

When a position comes close to an electron they annihilate into photons such that

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
2 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
3 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
4 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
5 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
6 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
7 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
8 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
9 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
10 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

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