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

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

Question # 2

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

Question # 3

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 4

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 5

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 6

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 7

At the temperature, a body emits radiation which is principally

Question # 8

If a material object moves with the speed of light 'C' its mass becomes

Question # 9

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

Question # 10

According to the special theory of relativity

Question # 11

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

Question # 12

Practically the quantity v/c is always:

Question # 13

The Stephen-Boltzmann law for the black body radiation is given by

Question # 14

There is no way to detect:

Question # 15

The energy of photon 'E' is proported to

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
2 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
3 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
5 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
6 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
7 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
8 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
10 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these

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