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

Momentum is a parameter associated with

Question # 2

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

Question # 3

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 4

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

Question # 5

An intertial frame of reference is a frame of reference which is

Question # 6

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 7

The positron was discovered by:

Question # 8

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 9

Electromagnetic -radiation means:

Question # 10

The concept of direction is purely:

Question # 11

Position was discovered by Carl Anderson in

Question # 12

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

Question # 13

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 # 14

A photon is considered to have

Question # 15

According to the special theory of relativity, a moving clock

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
3 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
4 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
5 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
6 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
7 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
8 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
9 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
10 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C

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