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	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
2	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
3	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
4	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
5	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
6	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
7	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
8	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
9	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
10	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

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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 platinum wire is heated, it appears dull red at about

The special theory of relativity treats problems invoving

Wien's constant is measured in:

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

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

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

In photoelectric effect the energy of ejected electrons depend on

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Strictly speaking, the earth is:

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

Photocell is a device which converts

When platinum wire is heated, it appears cherry red at

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

Electromagnetic -radiation means:

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

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

An inertial frame is that frame in which

Compton was awarded Nobel prize in physics in

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

There is no way to detect:

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

Practically the quantity v/c is always:

Electromagnetic radiation or photons interact with matter in

Intensity of light determines the:

Max Planck received the Nobel Prize for his discovery of energy quants in:

Position was discovered by Carl Anderson in

At the temperature, a body emits radiation which is principally

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

The special theory of relatively treats the problems involving:

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