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

Photocell is a device which converts

Question # 2

Strictly speaking, the earth is:

Question # 3

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

Question # 4

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

Question # 5

Newton's law of motion do not hold in

Question # 6

Practically the quantity v/c is always:

Question # 7

The value of threshold frequency for different metals is

Question # 8

The special theory of relativity is based on:

Question # 9

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 10

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 11

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

Question # 12

When a position comes close to an electron they annihilate into photons such that

Question # 13

The special theory of relativity treats problems invoving

Question # 14

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

Question # 15

In the compton's effect, it is found that the wavelength of incident x-rays is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
2 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
3 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
4 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
5 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
6 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
7 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
8 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
9 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
10 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

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