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

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

Question # 2

Strictly speaking, the earth is:

Question # 3

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

Question # 4

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

Question # 5

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 6

Victor de-Brogile received the Nobel prize in physics in

Question # 7

The special theory of relatively treats the problems involving:

Question # 8

The energy of photon 'E' is proported to

Question # 9

In photoelectric effect the energy of ejected electrons depend on

Question # 10

the symbol to be used in relativity problems denotes:

Question # 11

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

Question # 12

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 13

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 14

Electromagnetic radiation or photons interact with matter in

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
2 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
3 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
4 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
5 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
6 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
7 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
8 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
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 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these

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