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

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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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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	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
2	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
3	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
4	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
5	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
6	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
7	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
8	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
9	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
10	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these D. none 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

When a position comes close to an electron they annihilate into

Wien's constant is measured in:

The positron was discovered by:

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

According to the special theory of relativity, time is

Momentum is a parameter associated with

de-Broglies hypthesis was experimentally verified by

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

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

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

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

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

The existence of position was predicted by Dirace in

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

The general theory of relativity treats problems involving

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

The unit of work function is:

Compton was awarded Nobel prize in physics in

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

Position was discovered by Carl Anderson in

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

Electromagnetic -radiation means:

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

From the theory of relativity, momentum p of the photon is related to energy as

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

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

There is no way to detect:

A particle having mass and charge equal to that of an electron is called:

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Intensity of light determines the:

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