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

0.1 kg mass will be equivalent to the energy

Question # 2

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 # 3

According to the special theory of relativity

Question # 4

When a platinum wire is heated, it appears white at

Question # 5

An inertial frame is that frame in which

Question # 6

Newton's law of motion do not hold in

Question # 7

The special theory of relatively treats the problems involving:

Question # 8

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 9

S.I. unit of planks constant is

Question # 10

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

Question # 11

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 12

Photoelectrons are emitted when ultraviolet light falls on:

Question # 13

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

Question # 14

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

Question # 15

Electromagnetic radiation or photons interact with matter in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
2 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
3 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
5 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
6 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
7 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
8 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
9 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
10 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford

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