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

Question # 2

The photon of radio-waves has energy of about

Question # 3

The special theory of relativity is based on:

Question # 4

The energy of the 4th orbit in hydrogen atom is

Question # 5

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 6

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 7

Davision and Germer performed experiment to verify

Question # 8

According to the Max plank, energy is redialed or absorbed in

Question # 9

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

Question # 10

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

Question # 11

0.1 kg mass will be equivalent to the energy

Question # 12

Compton shift refers to:

Question # 13

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

Question # 14

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 15

When low energy photon interact with a metal,which of the following effect is likely to be taken place

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
2 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
3 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
4 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
5 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
6 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
7 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
8 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
9 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
10 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford

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