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

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

Question # 2

Photocell is a device which converts

Question # 3

The Einstein's changes in length, mass and time are not observed in common life because

Question # 4

the symbol to be used in relativity problems denotes:

Question # 5

Intensity of light determines the:

Question # 6

S.I. unit of planks constant is

Question # 7

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

Question # 8

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

Question # 9

The inside cavity of the black body is

Question # 10

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

Question # 11

Electromagnetic -radiation means:

Question # 12

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 13

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

Question # 14

Momentum is a parameter associated with

Question # 15

According to the special theory of relativity

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
3 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
4 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
5 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
6 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)
7 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
8 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
9 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
10 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

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