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

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

Question # 2

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 3

The length contraction happens only

Question # 4

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

Question # 5

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

Question # 6

According to the special theory of relativity

Question # 7

Which one of the following physical quantities changes with relativistic speed

Question # 8

The Einstein's changes in length, mass and time are not observed in common life because

Question # 9

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 10

According to the Max plank, energy is redialed or absorbed in

Question # 11

The special theory of relatively treats the problems involving:

Question # 12

Electromagnetic -radiation means:

Question # 13

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 14

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

Question # 15

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
3 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
4 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
5 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
6 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
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 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron

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