ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Question # 2

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

Question # 3

Wave nature of particle was proposed by

Question # 4

The special theory of relativity treats problems invoving

Question # 5

Which of the following phenomenon proves the particle nature of light

Question # 6

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 7

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

Question # 8

Photoelectric effect takes place with a photon of:

Question # 9

A black body is

Question # 10

The energy of a photon is represented by

Question # 11

Converse of pair production is known as

Question # 12

The special theory of relativity is based on the

Question # 13

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

Question # 14

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

Question # 15

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
2 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
3 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
4 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
5 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
6 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
8 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
9 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
10 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only

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