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

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

Question # 2

There is no way to detect:

Question # 3

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 4

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 5

Momentum is a parameter associated with

Question # 6

Compton was awarded Nobel prize in physics in

Question # 7

Compton shift refers to:

Question # 8

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 # 9

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 10

Practically the quantity v/c is always:

Question # 11

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

Question # 12

Converse of pair production is known as

Question # 13

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

Question # 14

The photon of radio-waves has energy of about

Question # 15

The special theory of relatively treats the problems involving:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
3 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
5 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
6 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)
7 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
8 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
9 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
10 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these

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