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

Practically the quantity v/c is always:

Question # 2

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

Question # 3

Strictly speaking, the earth is:

Question # 4

A photon is considered to have

Question # 5

The value of the Stephen's constant for black body radiations is given by

Question # 6

There is no way to detect:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

Photoelectrons are emitted when ultraviolet light falls on:

Question # 12

The Einstein's changes in length, mass and time are not observed in common life because

Question # 13

In photoelectric effect the energy of ejected electrons depend on

Question # 14

Victor de-Brogile received the Nobel prize in physics in

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
3 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
4 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 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
6 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
7 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
8 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
9 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
10 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above

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