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

The photon of radio-waves has energy of about

Question # 2

The energy of photon 'E' is proported to

Question # 3

The inside cavity of the black body is

Question # 4

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

Question # 5

Davision and Germer performed experiment to verify

Question # 6

Photoelectrons are emitted when ultraviolet light falls on:

Question # 7

When platinum wire is heated, it appears cherry red at

Question # 8

The concept of direction and position are purely

Question # 9

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 10

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

Question # 11

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 12

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

Question # 13

Compton shift refers to:

Question # 14

Victor de-Brogile received the Nobel prize in physics in

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
3 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
4 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
5 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
6 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
7 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
8 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
9 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
10 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

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