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

According to the special theory of relativity

Question # 2

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

Question # 3

There is no way to detect:

Question # 4

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

Question # 5

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

Question # 6

The nature of radiations emitted by a hot body depends upon its:

Question # 7

A photon is considered to have

Question # 8

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 9

The concept of direction and position are purely

Question # 10

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 11

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

Question # 12

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

Question # 13

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 14

The mass of an object will be doubled at speed

Question # 15

Wien's constant is measured in:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
2 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
3 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
4 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
5 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
6 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
7 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
8 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
9 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
10 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

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