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

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 3

Wave nature of particle was proposed by

Question # 4

Absolute motion cannot be detected

Question # 5

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 6

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 7

A particle having mass and charge equal to that of an electron is called:

Question # 8

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 9

Which of the following is not an example of intertial frame

Question # 10

Due to relative motion of observer and the frame of reference of events, time always:

Question # 11

Position was discovered by Carl Anderson in

Question # 12

S.I. unit of planks constant is

Question # 13

In photoelectric effect the energy of ejected electrons depend on

Question # 14

The special theory of relativity is based on the

Question # 15

Photoelectric effect takes place with a photon of:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
2 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
3 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
4 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
5 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
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 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
8 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
9 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
10 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these

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