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 way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 2

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

Question # 3

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

Question # 4

A non-inertial frame of reference is one, in which

Question # 5

The positron was discovered by:

Question # 6

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

Question # 7

Photoelectric effect takes place with a photon of:

Question # 8

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 9

The year when A.H. compton was awarded Nobel Prize is:

Question # 10

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

Question # 11

The concept of direction is purely:

Question # 12

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 13

According to the special theory of relativity

Question # 14

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

Question # 15

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
2 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
3 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
4 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
5 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
6 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
7 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
8 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
9 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)
10 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these

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