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

Photoelectrons are emitted when ultraviolet light falls on:

Question # 2

de-Broglies hypthesis was experimentally verified by

Question # 3

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 4

When a platinum wire is heated, it appears orange red at

Question # 5

Absolute motion cannot be detected

Question # 6

When a position comes close to an electron they annihilate into photons such that

Question # 7

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

Question # 8

The energy of photon 'E' is proported to

Question # 9

At the temperature, a body emits radiation which is principally

Question # 10

The inside cavity of the black body is

Question # 11

The energy of a photon is represented by

Question # 12

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

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

The Stephen-Boltzmann law for the black body radiation is given by

Question # 15

Due to relative motion of observer and the frame of reference of events, time always:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
3 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
4 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
5 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
6 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
7 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
8 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
9 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
10 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency

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