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

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

Question # 2

S.I. unit of planks constant is

Question # 3

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 4

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 5

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

Question # 6

The concept of direction and position are purely

Question # 7

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

Question # 8

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

Question # 9

The value of threshold frequency for different metals is

Question # 10

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 11

Wave nature of particle was proposed by

Question # 12

Wien's constant is measured in:

Question # 13

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

Question # 14

The inside cavity of the black body is

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
2 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
3 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
4 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
5 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
6 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
7 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
8 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
9 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
10 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature

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