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

When a platinum wire is heated, it appears yellow at

Question # 2

Victor de-Brogile received the Nobel prize in physics in

Question # 3

If a material object moves with the speed of light 'C' its mass becomes

Question # 4

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

Question # 5

The positron was discovered by:

Question # 6

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 7

Compton shift refers to:

Question # 8

Practically the quantity v/c is always:

Question # 9

The energy of a photon is represented by

Question # 10

Strictly speaking, the earth is:

Question # 11

Due to relative motion of observer and the frame of reference of events, time always:

Question # 12

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 13

Electromagnetic radiation or photons interact with matter in

Question # 14

Photocell is a device which converts

Question # 15

G.P. Thomson observer experimentally that electrons and neutrons possess

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
2 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
3 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
4 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
5 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
6 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
7 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
8 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
10 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these

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