ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

Pair production is the phenomenon in which

Question # 2

Intensity of light determines the:

Question # 3

0.1 kg mass will be equivalent to the energy

Question # 4

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 # 5

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

Question # 6

When a platinum wire is heated, it appears white at

Question # 7

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

Question # 8

When platinum wire is heated, it appears cherry red at

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

the dilation of time applies to the timing processes which are:

Question # 11

The value of threshold frequency for different metals is

Question # 12

In order to produce pair production, a photon must have a energy

Question # 13

Electromagnetic -radiation means:

Question # 14

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

Question # 15

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 16

Absolute motion cannot be detected

Question # 17

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 18

Wien's constant is measured in:

Question # 19

At the temperature, a body emits radiation which is principally

Question # 20

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

Question # 21

When a position comes close to an electron they annihilate into photons such that

Question # 22

The special theory of relativity is based on the

Question # 23

A black body is

Question # 24

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 25

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

Question # 26

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

Question # 27

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 28

Photoelectric effect takes place with a photon of:

Question # 29

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

Question # 30

Strictly speaking, the earth is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
2 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
3 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
4 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
5 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
6 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
7 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
8 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
9 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
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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