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 threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
2	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
3	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
4	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
5	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
6	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
7	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
8	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
9	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
10	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron

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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

According to the special theory of relativity, a moving clock

If a material object moves with the speed of light 'C' its mass becomes

The special theory of relativity treats problems invoving

Compton shift refers to:

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Wave nature of particle was proposed by

The inside cavity of the black body is

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

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

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

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

S.I. unit of planks constant is

A black body is

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

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Which one of the following physical quantities changes with relativistic speed

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

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

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

The year when A.H. compton was awarded Nobel Prize is:

Which of the following phenomenon proves the particle nature of light

Momentum is a parameter associated with

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

Practically the quantity v/c is always:

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

At the temperature, a body emits radiation which is principally

Newton's law of motion do not hold in

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

0.1 kg mass will be equivalent to the energy

Strictly speaking, the earth is:

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ECAT Physics Chapter 19 Important MCQ's

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