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

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 2

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

Question # 3

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 # 4

Compton shift refers to:

Question # 5

When a platinum wire is heated, it appears white at

Question # 6

The special theory of relatively treats the problems involving:

Question # 7

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

Question # 8

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

Question # 9

According to the special theory of relativity

Question # 10

The energy of a photon is represented by

Question # 11

When a platinum wire is heated, it appears orange red at

Question # 12

The photon of radio-waves has energy of about

Question # 13

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 14

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

Question # 15

Victor de-Brogile received the Nobel prize in physics in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
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 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
4 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
5 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
6 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)
7 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
8 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
10 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr

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