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

The value of threshold frequency for different metals is

Question # 2

The energy of photon 'E' is proported to

Question # 3

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

Question # 4

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 5

When a platinum wire is heated, it appears dull red at about

Question # 6

When a position comes close to an electron they annihilate into

Question # 7

Momentum is a parameter associated with

Question # 8

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

Question # 9

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

Question # 10

The general theory of relativity treats problems involving

Question # 11

The special theory of relativity is based on the

Question # 12

The concept of direction and position are purely

Question # 13

Photocell is a device which converts

Question # 14

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

Question # 15

The nature of radiations emitted by a hot body depends upon its:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
4 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
5 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
6 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
7 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
8 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
9 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
10 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal

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