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

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

Question # 2

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 # 3

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

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 dilation of time applies to the timing processes which are:

Question # 6

According to the special theory of relativity, time is

Question # 7

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

Question # 8

The value of threshold frequency for different metals is

Question # 9

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

Question # 10

The concept of direction is purely:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
2 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
3 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
4 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
5 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
7 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
8 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
9 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
10 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0

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