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

Converse of pair production is known as

Question # 2

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

Question # 3

The inside cavity of the black body is

Question # 4

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

Question # 5

Which of the following phenomenon proves the particle nature of light

Question # 6

With the help of 50 K v electron microscope, a resolution of

Question # 7

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

Question # 8

The unit of work function is:

Question # 9

The idea of quantization of energy was proposed by:

Question # 10

The concept of direction and position are purely

Question # 11

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 12

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 13

The value of the Stephen's constant for black body radiations is given by

Question # 14

Practically the quantity v/c is always:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
2 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
3 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
4 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
5 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
6 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
7 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
8 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
9 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
10 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these

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