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

A photon is considered to have

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

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

Question # 4

When the atomic particle are moving with velocities approaching that of light:

Question # 5

Photoelectrons are emitted when ultraviolet light falls on:

Question # 6

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 7

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

As the light shines on the metal surface, the electrons are ejected

Question # 14

An inertial frame is that frame in which

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
2 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
3 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
4 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
5 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
6 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
7 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
8 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
9 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
10 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons

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