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

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

Question # 2

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

Question # 3

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 4

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

Question # 5

There is no way to detect:

Question # 6

The value of the plank's constant 'h' is given by

Question # 7

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 # 8

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

Question # 9

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

Question # 10

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

Question # 11

At the temperature, a body emits radiation which is principally

Question # 12

Which of the following is not an example of intertial frame

Question # 13

Photocell is a device which converts

Question # 14

The concept of direction and position are purely

Question # 15

The idea of quantization of energy was proposed by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
3 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
4 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
5 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
6 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
7 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
8 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
9 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
10 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these

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