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 Einstein's changes in length, mass and time are not observed in common life because

Question # 2

Photoelectric effect takes place with a photon of:

Question # 3

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

Question # 4

The photon of radio-waves has energy of about

Question # 5

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

Question # 6

de-Broglies hypthesis was experimentally verified by

Question # 7

Wave nature of particle was proposed by

Question # 8

The value of the Stephen's constant for black body radiations is given by

Question # 9

The special theory of relativity is based on the

Question # 10

Compton shift refers to:

Question # 11

Which one of the following physical quantities changes with relativistic speed

Question # 12

The energy of photon 'E' is proported to

Question # 13

Absolute motion cannot be detected

Question # 14

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
2 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
3 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
5 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
6 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
7 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
8 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
9 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
10 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

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