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

Electromagnetic radiation or photons interact with matter in

Question # 2

Strictly speaking, the earth is:

Question # 3

Photocell is a device which converts

Question # 4

Absolute motion cannot be detected

Question # 5

Due to relative motion of observer and the frame of reference of events, time always:

Question # 6

The inside cavity of the black body is

Question # 7

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

Question # 8

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 9

The special theory of relatively treats the problems involving:

Question # 10

The general theory of relativity treats problems involving

Question # 11

Wien's constant is measured in:

Question # 12

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

Question # 13

The positron was discovered by:

Question # 14

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

Question # 15

the symbol to be used in relativity problems denotes:

Question # 16

Newton's law of motion do not hold in

Question # 17

There is no way to detect:

Question # 18

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

Question # 19

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

Question # 20

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 21

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

Question # 22

From the theory of relativity, momentum p of the photon is related to energy as

Question # 23

Photoelectric effect takes place with a photon of:

Question # 24

The year when A.H. compton was awarded Nobel Prize is:

Question # 25

In photoelectric effect the energy of ejected electrons depend on

Question # 26

Which one of the following physical quantities changes with relativistic speed

Question # 27

According to the special theory of relativity, time is

Question # 28

The length contraction happens only

Question # 29

Davision and Germer performed experiment to verify

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
2 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
3 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
4 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
5 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
6 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
7 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
8 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
9 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
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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