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

Question # 2

Absolute motion cannot be detected

Question # 3

An intertial frame of reference is a frame of reference which is

Question # 4

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 5

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 6

Which of the following phenomenon proves the particle nature of light

Question # 7

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

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

The positron was discovered by:

Question # 11

A photon is considered to have

Question # 12

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 13

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 14

The value of threshold frequency for different metals is

Question # 15

According to the special theory of relativity, a moving clock

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
3 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
4 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
5 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
6 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
7 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
9 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
10 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

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