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

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 # 2

A photon is considered to have

Question # 3

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

Question # 4

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 5

The special theory of relativity treats problems invoving

Question # 6

Which of the following is not an example of intertial frame

Question # 7

When a platinum wire is heated, it appears white at

Question # 8

A black body is

Question # 9

the dilation of time applies to the timing processes which are:

Question # 10

The concept of direction and position are purely

Question # 11

Practically the quantity v/c is always:

Question # 12

In photoelectric effect the energy of ejected electrons depend on

Question # 13

The positron was discovered by:

Question # 14

A particle having mass and charge equal to that of an electron is called:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
2 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
3 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)
4 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
5 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
6 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
7 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
8 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
9 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
10 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these

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