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

The existence of position was predicted by Dirace in

Question # 2

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 3

The energy of the 4th orbit in hydrogen atom is

Question # 4

A photon is considered to have

Question # 5

When a platinum wire is heated, it appears yellow at

Question # 6

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

Question # 7

Victor de-Brogile received the Nobel prize in physics in

Question # 8

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

Question # 9

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

Question # 10

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 11

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 # 12

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

Question # 13

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 14

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

Question # 15

The general theory of relativity treats problems involving

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
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 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
5 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
6 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
7 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
8 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
10 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these

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