ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 7

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 8

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

Question # 9

According to the special theory of relativity, time is

Question # 10

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

Question # 11

A photon is considered to have

Question # 12

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 13

The special theory of relatively treats the problems involving:

Question # 14

the dilation of time applies to the timing processes which are:

Question # 15

Intensity of light determines the:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
2 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
3 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
4 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
5 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
6 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
7 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
8 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
9 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
10 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson

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