ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency
2	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:	A. Smaller B. Lerger C. Same D. Much larger
3	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
4	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
5	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
6	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
7	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
8	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
9	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
10	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation

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

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

The general theory of relativity treats problems involving

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

Photoelectric effect takes place with a photon of:

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

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

The photon of radio-waves has energy of about

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Momentum is a parameter associated with

The existence of position was predicted by Dirace in

Strictly speaking, the earth is:

The concept of direction and position are purely

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

There is no way to detect:

When a platinum wire is heated, it appears dull red at about

The value of the Stephen's constant for black body radiations is given by

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

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

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

Photocell is a device which converts

Intensity of light determines the:

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

A photon is considered to have

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

S.I. unit of planks constant is

0.1 kg mass will be equivalent to the energy

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

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

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

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ECAT Physics Chapter 19 Important MCQ's

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