ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

The energy of the 4th orbit in hydrogen atom is

Question # 3

The positron was discovered by:

Question # 4

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

Question # 5

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The photon of radio-waves has energy of about

Question # 10

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

Question # 11

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

Question # 12

Photoelectric effect takes place with a photon of:

Question # 13

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

Question # 14

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 15

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:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
2 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
3 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
4 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
5 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
6 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
7 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
8 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
9 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
10 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

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    hasnain

    30 May 2018

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