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 Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
2	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
3	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
4	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
5	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
6	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
7	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
8	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
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 photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v

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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

Which of the following phenomenon proves the particle nature of light

Converse of pair production is known as

Strictly speaking, the earth is:

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

The positron was discovered by:

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

The value of threshold frequency for different metals is

Position was discovered by Carl Anderson in

The idea of quantization of energy was proposed by:

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

The concept of direction is purely:

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

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

Which of the following is not an example of intertial frame

The existence of position was predicted by Dirace in

S.I. unit of planks constant is

The energy of photon 'E' is proported to

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

Newton's law of motion do not hold in

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

Compton shift refers to:

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

In the compton's effect, it is found that the wavelength of incident x-rays is

Wave nature of particle was proposed by

In photoelectric effect the energy of ejected electrons depend on

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

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

There is no way to detect:

The way through which electromagnetic radiations or photons interact with matter depends upon their:

At the temperature, a body emits radiation which is principally

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ECAT Physics Chapter 19 Important MCQ's

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