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	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
2	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
3	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
4	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
5	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
6	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
7	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
8	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
9	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
10	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

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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 length contraction happens only

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

Compton shift refers to:

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

The special theory of relativity treats problems invoving

Practically the quantity v/c is always:

Davision and Germer performed experiment to verify

An inertial frame is that frame in which

Compton was awarded Nobel prize in physics in

Electromagnetic radiation or photons interact with matter in

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

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

Victor de-Brogile received the Nobel prize in physics in

de-Broglies hypthesis was experimentally verified by

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

According to the special theory of relativity

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Intensity of light determines the:

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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

There is no way to detect:

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

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

Wien's constant is measured in:

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

The value of the plank's constant 'h' is given by

Strictly speaking, the earth is:

Momentum is a parameter associated with

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