ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

Wave nature of particle was proposed by

Question # 2

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 5

When a platinum wire is heated, it appears yellow at

Question # 6

The value of the plank's constant 'h' is given by

Question # 7

Strictly speaking, the earth is:

Question # 8

The special theory of relativity is based on:

Question # 9

Victor de-Brogile received the Nobel prize in physics in

Question # 10

The unit of work function is:

Question # 11

Pair production is the phenomenon in which

Question # 12

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

Question # 13

Compton shift refers to:

Question # 14

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 15

The photoelectric effect, the maximum energy of photoelectrons depends on the

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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 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
3 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
4 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
5 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
6 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
7 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
8 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
9 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
10 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2

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    hasnain

    30 May 2018

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