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

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

Question # 2

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

Question # 3

The value of the Stephen's constant for black body radiations is given by

Question # 4

An inertial frame is that frame in which

Question # 5

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

Question # 6

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

Question # 7

The special theory of relativity is based on:

Question # 8

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

Question # 9

The special theory of relatively treats the problems involving:

Question # 10

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

Question # 11

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

Question # 12

At the temperature, a body emits radiation which is principally

Question # 13

The positron was discovered by:

Question # 14

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 15

the symbol to be used in relativity problems denotes:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
2 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
3 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
4 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
5 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
6 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
9 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
10 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference

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