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 way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
2	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
3	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
4	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
5	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
6	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
7	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
8	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
9	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
10	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

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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

Converse of pair production is known as

The positron was discovered by:

The existence of position was predicted by Dirace in

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

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

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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

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

The value of threshold frequency for different metals is

The general theory of relativity treats problems involving

If a body reaches a speed equal to the speed of light, then its mass will became

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

An inertial frame is that frame in which

Practically the quantity v/c is always:

There is no way to detect:

Position was discovered by Carl Anderson in

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

S.I. unit of planks constant is

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

In photoelectric effect the energy of ejected electrons depend on

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

Which of the following is not an example of intertial frame

Strictly speaking, the earth is:

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

A black body is

The special theory of relativity treats problems invoving

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

Photoelectric effect takes place with a photon of:

Electromagnetic -radiation means:

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

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ECAT Physics Chapter 19 Important MCQ's

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