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

The mass of an object will be doubled at speed

Question # 2

The energy of a photon is represented by

Question # 3

The energy of photon 'E' is proported to

Question # 4

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

Question # 5

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

Question # 6

Absolute motion cannot be detected

Question # 7

A photon is considered to have

Question # 8

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

Question # 9

In photoelectric effect the energy of ejected electrons depend on

Question # 10

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 # 11

The existence of position was predicted by Dirace in

Question # 12

According to the special theory of relativity, time is

Question # 13

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 14

Pair production is the phenomenon in which

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
2 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
3 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
4 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
5 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
6 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
7 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
9 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
10 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well

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