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 Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
2	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
3	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
4	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
5	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
6	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
7	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
8	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
9	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
10	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these

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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

The energy of the 4th orbit in hydrogen atom is

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

S.I. unit of planks constant is

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

The photon of radio-waves has energy of about

The unit of work function is:

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

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

The nature of radiations emitted by a hot body depends upon its:

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

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

The length contraction happens only

Max Planck received the Nobel Prize for his discovery of energy quants in:

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

G.P. Thomson observer experimentally that electrons and neutrons possess

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

The Einstein's changes in length, mass and time are not observed in common life because

Compton shift refers to:

There is no way to detect:

The mass of an object will be doubled at speed

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

The value of threshold frequency for different metals is

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

According to the special theory of relativity, time is

The special theory of relativity is based on:

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

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

the symbol to be used in relativity problems denotes:

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ECAT Physics Chapter 19 Important MCQ's

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