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

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Question # 1

The length contraction happens only

Question # 2

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

Question # 3

Intensity of light determines the:

Question # 4

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

Question # 5

Newton's law of motion do not hold in

Question # 6

A particle having mass and charge equal to that of an electron is called:

Question # 7

the symbol to be used in relativity problems denotes:

Question # 8

The inside cavity of the black body is

Question # 9

Position was discovered by Carl Anderson in

Question # 10

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

Question # 11

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 # 12

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

Question # 13

When a position comes close to an electron they annihilate into

Question # 14

The concept of direction and position are purely

Question # 15

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 # 16

A black body is

Question # 17

Electromagnetic radiation or photons interact with matter in

Question # 18

When platinum wire is heated, it appears cherry red at

Question # 19

According to the special theory of relativity, a moving clock

Question # 20

Davision and Germer performed experiment to verify

Question # 21

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

Question # 22

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

Question # 23

The nature of radiations emitted by a hot body depends upon its:

Question # 24

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 25

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 26

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 27

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

Question # 28

The photon of radio-waves has energy of about

Question # 29

Photoelectric effect takes place with a photon of:

Question # 30

The energy of a photon is represented by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
3 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
4 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
5 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
6 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
7 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
8 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
9 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
10 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these

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