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	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
2	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
3	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
4	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
5	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
6	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
7	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
8	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
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	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red

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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

the symbol to be used in relativity problems denotes:

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

Wien's constant is measured in:

Which of the following is not an example of intertial frame

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

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

The special theory of relativity is based on:

Intensity of light determines the:

According to the special theory of relativity, time is

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

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

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

Strictly speaking, the earth is:

The energy of the 4th orbit in hydrogen atom is

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

With the help of 50 K v electron microscope, a resolution of

The idea of quantization of energy was proposed by:

Momentum is a parameter associated with

Photocell is a device which converts

A photon is considered to have

S.I. unit of planks constant is

There is no way to detect:

The Stephen-Boltzmann law for the black body radiation is given by

As the light shines on the metal surface, the electrons are ejected

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

An inertial frame is that frame in which

The special theory of relatively treats the problems involving:

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

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

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ECAT Physics Chapter 19 Important MCQ's

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