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 photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 2

According to the special theory of relativity

Question # 3

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

Question # 4

Which of the following is not an example of intertial frame

Question # 5

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 6

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

Question # 7

Davision and Germer performed experiment to verify

Question # 8

When the atomic particle are moving with velocities approaching that of light:

Question # 9

the symbol to be used in relativity problems denotes:

Question # 10

An inertial frame is that frame in which

Question # 11

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

Question # 12

The value of threshold frequency for different metals is

Question # 13

There is no way to detect:

Question # 14

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 15

If a body reaches a speed equal to the speed of light, then its mass will became

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
2 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
3 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
4 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
5 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
6 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:
A. Smaller
B. Lerger
C. Same
D. Much larger
7 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
8 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
9 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
10 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these

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