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

Intensity of light determines the:

Question # 2

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 3

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

Question # 4

The energy of a photon is represented by

Question # 5

Wave nature of particle was proposed by

Question # 6

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 7

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

Question # 8

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

Question # 9

Victor de-Brogile received the Nobel prize in physics in

Question # 10

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 11

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

Question # 12

Momentum is a parameter associated with

Question # 13

The existence of position was predicted by Dirace in

Question # 14

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

Question # 15

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
2 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
3 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
4 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
5 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
6 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
7 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
8 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
9 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
10 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v

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