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

Which one of the following physical quantities changes with relativistic speed

Question # 2

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

Question # 3

The length contraction happens only

Question # 4

Photoelectrons are emitted when ultraviolet light falls on:

Question # 5

Intensity of light determines the:

Question # 6

An inertial frame is that frame in which

Question # 7

the dilation of time applies to the timing processes which are:

Question # 8

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

Question # 9

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 10

The Einstein's changes in length, mass and time are not observed in common life because

Question # 11

As the light shines on the metal surface, the electrons are ejected

Question # 12

Which of the following is not an example of intertial frame

Question # 13

A photon is considered to have

Question # 14

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 15

The energy of photon 'E' is proported to

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
3 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
4 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
5 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
6 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
7 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
8 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
9 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
10 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these

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