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

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

Question # 2

When a platinum wire is heated, it appears yellow at

Question # 3

Absolute motion cannot be detected

Question # 4

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

Question # 5

The idea of quantization of energy was proposed by:

Question # 6

Electromagnetic -radiation means:

Question # 7

The length contraction happens only

Question # 8

Strictly speaking, the earth is:

Question # 9

Intensity of light determines the:

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

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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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 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
3 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
4 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
5 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
6 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
7 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
8 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
9 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
10 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr

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