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

Davision and Germer performed experiment to verify

Question # 2

With the help of 50 K v electron microscope, a resolution of

Question # 3

An intertial frame of reference is a frame of reference which is

Question # 4

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

Question # 5

Photoelectrons are emitted when ultraviolet light falls on:

Question # 6

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

Question # 7

Which one of the following physical quantities changes with relativistic speed

Question # 8

A black body is

Question # 9

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 10

Victor de-Brogile received the Nobel prize in physics in

Question # 11

When a position comes close to an electron they annihilate into

Question # 12

The energy of the 4th orbit in hydrogen atom is

Question # 13

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 14

The concept of direction is purely:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
2 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
3 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
4 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
5 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
6 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
7 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
8 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
9 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
10 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red

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