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 stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

In photoelectric effect the energy of ejected electrons depend on

Question # 4

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

Question # 5

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 # 6

Photoelectrons are emitted when ultraviolet light falls on:

Question # 7

When platinum wire is heated, it appears cherry red at

Question # 8

An inertial frame is that frame in which

Question # 9

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 10

Intensity of light determines the:

Question # 11

S.I. unit of planks constant is

Question # 12

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

Question # 13

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 14

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

Question # 15

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
2 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
3 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
4 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
5 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
6 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
7 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
8 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
9 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
10 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v

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