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

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 2

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

Question # 3

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:

Question # 4

From the theory of relativity, momentum p of the photon is related to energy as

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

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

Question # 7

The energy of the 4th orbit in hydrogen atom is

Question # 8

Compton was awarded Nobel prize in physics in

Question # 9

Practically the quantity v/c is always:

Question # 10

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

Question # 11

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

Question # 12

The concept of direction and position are purely

Question # 13

An inertial frame is that frame in which

Question # 14

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 15

In order to produce pair production, a photon must have a energy

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
2 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
3 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
4 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
5 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
6 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
7 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
8 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
9 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
10 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923

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