ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

According to the special theory of relativity, a moving clock

Question # 2

Wien's constant is measured in:

Question # 3

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

Question # 4

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 # 5

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 6

The energy of a photon is represented by

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

When a position comes close to an electron they annihilate into photons such that

Question # 11

The special theory of relativity is based on the

Question # 12

Pair production is the phenomenon in which

Question # 13

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

Question # 14

At the temperature, a body emits radiation which is principally

Question # 15

0.1 kg mass will be equivalent to the energy

Question # 16

A photon is considered to have

Question # 17

Intensity of light determines the:

Question # 18

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

Question # 19

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 20

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 21

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 22

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

Question # 23

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

Question # 24

Absolute motion cannot be detected

Question # 25

Electromagnetic -radiation means:

Question # 26

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

Question # 27

Photoelectric effect takes place with a photon of:

Question # 28

When platinum wire is heated, it appears cherry red at

Question # 29

The unit of work function is:

Question # 30

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
2 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
4 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
5 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
6 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
7 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
8 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
9 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
10 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these

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