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	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
2	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
3	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
4	Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in	A. 1890 B. 1895 C. 1900 D. 1905
5	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
6	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
7	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)
8	The special theory of relatively treats the problems involving:	A. Inertial frames of reference B. Non-inertial frames C. Non-accelerated frame D. Botha (A) and (C)
9	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
10	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle

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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

S.I. unit of planks constant is

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

Compton studied the scattering of x-rays by loosely bound electrons from:

The length contraction happens only

Compton shift refers to:

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

According to the special theory of relativity, time is

The mass of an object will be doubled at speed

Electromagnetic -radiation means:

The special theory of relatively treats the problems involving:

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

Wave nature of particle was proposed by

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Wien's constant is measured in:

The existence of position was predicted by Dirace in

Electromagnetic radiation or photons interact with matter in

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

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

The positron was discovered by:

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

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

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Which of the following phenomenon proves the particle nature of light

The idea of quantization of energy was proposed by:

According to the special theory of relativity, a moving clock

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

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

The photon of radio-waves has energy of about

The special theory of relativity is based on the

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