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

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

Question # 2

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

Question # 3

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 4

Which of the following is not an example of intertial frame

Question # 5

Compton was awarded Nobel prize in physics in

Question # 6

The energy of a photon is represented by

Question # 7

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 8

The energy of the 4th orbit in hydrogen atom is

Question # 9

Position was discovered by Carl Anderson in

Question # 10

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

Question # 11

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 12

According to the special theory of relativity, a moving clock

Question # 13

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

Question # 14

If a material object moves with the speed of light 'C' its mass becomes

Question # 15

Wave nature of particle was proposed by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
2 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
3 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
4 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
5 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
7 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
8 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
9 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
10 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v

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