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

The year when A.H. compton was awarded Nobel Prize is:

Question # 2

When a platinum wire is heated, it appears orange red at

Question # 3

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 4

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

Question # 5

According to the Max plank, energy is redialed or absorbed in

Question # 6

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

Question # 7

The photon of radio-waves has energy of about

Question # 8

At the temperature, a body emits radiation which is principally

Question # 9

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Electromagnetic radiation or photons interact with matter in

Question # 15

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

Question # 16

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 17

A black body is

Question # 18

Strictly speaking, the earth is:

Question # 19

the symbol to be used in relativity problems denotes:

Question # 20

Electromagnetic -radiation means:

Question # 21

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

Question # 22

Position was discovered by Carl Anderson in

Question # 23

Pair production is the phenomenon in which

Question # 24

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 # 25

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

Question # 26

The special theory of relativity is based on the

Question # 27

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

Question # 28

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

Question # 29

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 30

When platinum wire is heated, it appears cherry red at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
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 a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
5 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
6 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
7 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
8 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
9 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
10 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons

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