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

Electromagnetic radiation or photons interact with matter in

Question # 2

The value of the plank's constant 'h' is given by

Question # 3

According to the Max plank, energy is redialed or absorbed in

Question # 4

A black body is

Question # 5

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

Question # 6

According to the special theory of relativity, a moving clock

Question # 7

The idea of quantization of energy was proposed by:

Question # 8

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

Question # 9

Which of the following is not an example of intertial frame

Question # 10

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 11

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

Question # 12

The year when A.H. compton was awarded Nobel Prize is:

Question # 13

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

Question # 14

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 15

The photon of radio-waves has energy of about

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
2 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
3 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
4 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
5 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
6 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
7 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
8 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
9 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
10 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these

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