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

Wien's constant is measured in:

Question # 2

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

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

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 5

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

Question # 6

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

Question # 7

Compton was awarded Nobel prize in physics in

Question # 8

The general theory of relativity treats problems involving

Question # 9

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

Question # 10

Strictly speaking, the earth is:

Question # 11

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 12

There is no way to detect:

Question # 13

The inside cavity of the black body is

Question # 14

According to the special theory of relativity, a moving clock

Question # 15

The special theory of relativity treats problems invoving

Question # 16

When a platinum wire is heated, it appears yellow at

Question # 17

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

Question # 18

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

Question # 19

The concept of direction and position are purely

Question # 20

The idea of quantization of energy was proposed by:

Question # 21

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

Question # 22

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

Question # 23

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 24

From the theory of relativity, momentum p of the photon is related to energy as

Question # 25

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 # 26

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

Question # 27

The photon of radio-waves has energy of about

Question # 28

The energy of a photon is represented by

Question # 29

When platinum wire is heated, it appears cherry red at

Question # 30

Momentum is a parameter associated with

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
2 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
3 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
4 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
5 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
6 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
7 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
8 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
9 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
10 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4

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