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

Wien's constant is measured in:

Question # 2

The length contraction happens only

Question # 3

According to the special theory of relativity, a moving clock

Question # 4

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

Question # 5

Which of the following is not an example of intertial frame

Question # 6

Which one of the following physical quantities changes with relativistic speed

Question # 7

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

Question # 8

The value of threshold frequency for different metals is

Question # 9

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 10

S.I. unit of planks constant is

Question # 11

The special theory of relativity treats problems invoving

Question # 12

An inertial frame is that frame in which

Question # 13

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 14

The energy of photon 'E' is proported to

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
3 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
4 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
5 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
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 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)
8 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
9 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
10 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)

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