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

A photon is considered to have

Question # 2

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

Question # 3

Pair production is the phenomenon in which

Question # 4

0.1 kg mass will be equivalent to the energy

Question # 5

Which of the following phenomenon proves the particle nature of light

Question # 6

Compton was awarded Nobel prize in physics in

Question # 7

The special theory of relativity is based on:

Question # 8

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 9

Photoelectrons are emitted when ultraviolet light falls on:

Question # 10

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

Question # 11

The special theory of relativity treats problems invoving

Question # 12

Electromagnetic -radiation means:

Question # 13

The energy of the 4th orbit in hydrogen atom is

Question # 14

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

Question # 15

A black body is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
2 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
3 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
4 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
5 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
6 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
7 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
8 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 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
10 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

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