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

When a platinum wire is heated, it appears white at

Question # 2

From the theory of relativity, momentum p of the photon is related to energy as

Question # 3

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 4

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 5

Practically the quantity v/c is always:

Question # 6

Electromagnetic -radiation means:

Question # 7

Absolute motion cannot be detected

Question # 8

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

Question # 9

As the light shines on the metal surface, the electrons are ejected

Question # 10

Newton's law of motion do not hold in

Question # 11

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

Question # 12

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 13

The inside cavity of the black body is

Question # 14

The special theory of relativity treats problems invoving

Question # 15

When a position comes close to an electron they annihilate into

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 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
4 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
5 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
6 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
7 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
8 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
9 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
10 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

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