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

Intensity of light determines the:

Question # 2

With the help of 50 K v electron microscope, a resolution of

Question # 3

At the temperature, a body emits radiation which is principally

Question # 4

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

Question # 5

The mass of an object will be doubled at speed

Question # 6

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

Question # 7

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 8

If a material object moves with the speed of light 'C' its mass becomes

Question # 9

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 10

Which of the following is not an example of intertial frame

Question # 11

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 12

The value of the Stephen's constant for black body radiations is given by

Question # 13

The inside cavity of the black body is

Question # 14

An inertial frame is that frame in which

Question # 15

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

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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 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
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 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 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
6 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
7 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
8 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
9 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
10 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion

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