ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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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	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
3	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
4	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}
5	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
6	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
7	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
8	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
9	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
10	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C

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ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

According to the special theory of relativity, a moving clock

Strictly speaking, the earth is:

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

The inside cavity of the black body is

Pair production is the phenomenon in which

Momentum is a parameter associated with

Davision and Germer performed experiment to verify

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

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

The special theory of relatively treats the problems involving:

S.I. unit of planks constant is

Practically the quantity v/c is always:

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

The special theory of relativity is based on:

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

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

If a body reaches a speed equal to the speed of light, then its mass will became

According to the special theory of relativity

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

Compton shift refers to:

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

Which of the following phenomenon proves the particle nature of light

According to the special theory of relativity, time is

Absolute motion cannot be detected

Position was discovered by Carl Anderson in

The Nobel Prize on the explanation of photoelectric effect was awarded to:

When a position comes close to an electron they annihilate into photons such that

There is no way to detect:

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

Which one of the following physical quantities changes with relativistic speed

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ECAT Physics Chapter 19 Important MCQ's

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