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 symbol to be used in relativity problems denotes:

Question # 2

S.I. unit of planks constant is

Question # 3

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

Question # 4

The unit of work function is:

Question # 5

When a platinum wire is heated, it appears yellow at

Question # 6

Intensity of light determines the:

Question # 7

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

Question # 8

The length contraction happens only

Question # 9

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

Question # 10

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

Question # 11

When a platinum wire is heated, it appears orange red at

Question # 12

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

Question # 13

Wien's constant is measured in:

Question # 14

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

Question # 15

Victor de-Brogile received the Nobel prize in physics in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
2 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
3 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
4 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
5 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
6 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
7 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
8 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:
A. Smaller
B. Lerger
C. Same
D. Much larger
9 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
10 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer

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