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

Question # 2

the symbol to be used in relativity problems denotes:

Question # 3

The mass of an object will be doubled at speed

Question # 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

Question # 5

There is no way to detect:

Question # 6

The special theory of relativity is based on:

Question # 7

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 8

The length contraction happens only

Question # 9

The nature of radiations emitted by a hot body depends upon its:

Question # 10

The Stephen-Boltzmann law for the black body radiation is given by

Question # 11

Victor de-Brogile received the Nobel prize in physics in

Question # 12

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 13

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

Question # 14

A non-inertial frame of reference is one, in which

Question # 15

If a material object moves with the speed of light 'C' its mass becomes

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
2 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
3 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 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
5 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
6 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
7 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
8 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
9 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
10 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy

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