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

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 2

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

Question # 3

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

Question # 4

Position was discovered by Carl Anderson in

Question # 5

Practically the quantity v/c is always:

Question # 6

Which one of the following physical quantities changes with relativistic speed

Question # 7

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

Question # 8

Pair production is the phenomenon in which

Question # 9

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 10

Absolute motion cannot be detected

Question # 11

According to the special theory of relativity

Question # 12

According to the special theory of relativity, time is

Question # 13

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

Question # 14

The value of threshold frequency for different metals is

Question # 15

When a position comes close to an electron they annihilate into

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
2 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
3 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
4 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
5 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
6 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
7 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
8 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
9 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
10 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always

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