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

Question # 2

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 3

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 4

Wave nature of particle was proposed by

Question # 5

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 6

When a platinum wire is heated, it appears yellow at

Question # 7

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 # 8

Pair production is the phenomenon in which

Question # 9

A non-inertial frame of reference is one, in which

Question # 10

The energy of a photon is represented by

Question # 11

The unit of work function is:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
3 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
4 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
5 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
6 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
7 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
8 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
9 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
10 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

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