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	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
2	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
3	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
4	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
5	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
6	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
7	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
8	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
9	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
10	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red

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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

Photoelectric effect takes place with a photon of:

S.I. unit of planks constant is

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

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

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

Newton's law of motion do not hold in

The special theory of relativity treats problems invoving

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

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

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

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Compton studied the scattering of x-rays by loosely bound electrons from:

Photocell is a device which converts

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

The energy of a photon is represented by

According to the Max plank, energy is redialed or absorbed in

When a position comes close to an electron they annihilate into

There is no way to detect:

Compton shift refers to:

Compton was awarded Nobel prize in physics in

A black body is

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

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

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

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

The special theory of relatively treats the problems involving:

Which of the following is not an example of intertial frame

In photoelectric effect the energy of ejected electrons depend on

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