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

0.1 kg mass will be equivalent to the energy

Question # 2

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 3

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 4

The existence of position was predicted by Dirace in

Question # 5

An inertial frame is that frame in which

Question # 6

Absolute motion cannot be detected

Question # 7

Which of the following is not an example of intertial frame

Question # 8

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

Question # 9

If a material object moves with the speed of light 'C' its mass becomes

Question # 10

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

Question # 11

The special theory of relativity is based on the

Question # 12

Pair production is the phenomenon in which

Question # 13

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

Question # 14

The value of the plank's constant 'h' is given by

Question # 15

The concept of direction and position are purely

Question # 16

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

Question # 17

The length contraction happens only

Question # 18

Momentum is a parameter associated with

Question # 19

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

Question # 20

Compton shift refers to:

Question # 21

The energy of a photon is represented by

Question # 22

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

Question # 23

The idea of quantization of energy was proposed by:

Question # 24

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

Question # 25

In photoelectric effect the energy of ejected electrons depend on

Question # 26

Victor de-Brogile received the Nobel prize in physics in

Question # 27

A black body is

Question # 28

The general theory of relativity treats problems involving

Question # 29

The inside cavity of the black body is

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
2 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
3 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
4 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
8 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)
9 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
10 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass

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