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

At the temperature, a body emits radiation which is principally

Question # 2

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 3

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

Question # 4

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

Question # 5

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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 # 11

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

Question # 12

According to the special theory of relativity, time is

Question # 13

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

Question # 14

An inertial frame is that frame in which

Question # 15

Pair production is the phenomenon in which

Question # 16

The Stephen-Boltzmann law for the black body radiation is given by

Question # 17

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 18

The mass of an object will be doubled at speed

Question # 19

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

Question # 20

With the help of 50 K v electron microscope, a resolution of

Question # 21

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

Question # 22

The energy of photon 'E' is proported to

Question # 23

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 24

An intertial frame of reference is a frame of reference which is

Question # 25

The value of threshold frequency for different metals is

Question # 26

When a platinum wire is heated, it appears white at

Question # 27

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

Question # 28

Strictly speaking, the earth is:

Question # 29

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

Question # 30

Which one of the following physical quantities changes with relativistic speed

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
3 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
4 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
5 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
6 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
7 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
8 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
9 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
10 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion

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