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

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 2

The general theory of relativity treats problems involving

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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 # 7

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 8

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

Question # 9

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 10

Pair production is the phenomenon in which

Question # 11

The energy of the 4th orbit in hydrogen atom is

Question # 12

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

Question # 13

According to the special theory of relativity, a moving clock

Question # 14

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

Question # 15

Victor de-Brogile received the Nobel prize in physics in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
3 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
4 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
5 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
6 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
7 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
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 value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
10 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them

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