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 photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
2	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
3	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
4	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
5	The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
6	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
7	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
8	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
9	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
10	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant

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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

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

In photoelectric effect the energy of ejected electrons depend on

A non-inertial frame of reference is one, in which

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

Intensity of light determines the:

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

The existence of position was predicted by Dirace in

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

There is no way to detect:

According to the special theory of relativity

Photoelectrons are emitted when ultraviolet light falls on:

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

The general theory of relativity treats problems involving

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

When a position comes close to an electron they annihilate into

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

The positron was discovered by:

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

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

The photon of radio-waves has energy of about

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

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

The energy of photon 'E' is proported to

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

Which one of the following physical quantities changes with relativistic speed

Position was discovered by Carl Anderson in

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ECAT Physics Chapter 19 Important MCQ's

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