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

Davision and Germer performed experiment to verify

Question # 2

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

Question # 3

Due to relative motion of observer and the frame of reference of events, time always:

Question # 4

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

Question # 5

The special theory of relativity is based on the

Question # 6

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 7

When the atomic particle are moving with velocities approaching that of light:

Question # 8

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

Question # 9

The special theory of relatively treats the problems involving:

Question # 10

The unit of work function is:

Question # 11

Strictly speaking, the earth is:

Question # 12

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

Question # 13

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

Question # 14

Compton was awarded Nobel prize in physics in

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
2 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
3 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
4 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
5 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
6 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
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 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
9 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
10 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)

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