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

Photocell is a device which converts

Question # 2

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

Question # 3

When the atomic particle are moving with velocities approaching that of light:

Question # 4

From the theory of relativity, momentum p of the photon is related to energy as

Question # 5

The special theory of relativity is based on the

Question # 6

As the light shines on the metal surface, the electrons are ejected

Question # 7

The special theory of relatively treats the problems involving:

Question # 8

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

Question # 9

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 10

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 11

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 12

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 13

Photoelectrons are emitted when ultraviolet light falls on:

Question # 14

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
2 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
3 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
5 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
6 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
7 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
8 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
9 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
10 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

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