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

Question # 2

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

Question # 3

The value of the plank's constant 'h' is given by

Question # 4

Wave nature of particle was proposed by

Question # 5

The special theory of relativity is based on:

Question # 6

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 7

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

Question # 8

Which one of the following physical quantities changes with relativistic speed

Question # 9

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 10

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

Question # 11

the dilation of time applies to the timing processes which are:

Question # 12

Position was discovered by Carl Anderson in

Question # 13

Which of the following phenomenon proves the particle nature of light

Question # 14

According to the Max plank, energy is redialed or absorbed in

Question # 15

A black body is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
2 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
3 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
4 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
5 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
6 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
7 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
8 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
9 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
10 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light

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