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

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ECAT Class Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
2	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
3	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
4	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
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	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
7	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
8	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
9	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
10	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932

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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

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

The value of threshold frequency for different metals is

The special theory of relativity treats problems invoving

With the help of 50 K v electron microscope, a resolution of

A black body is

Intensity of light determines the:

An inertial frame is that frame in which

According to the de-Brogile relation, an object of large mass and ordinary speed has

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

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

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

Photocell is a device which converts

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

The inside cavity of the black body is

Pair production is the phenomenon in which

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

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

Davision and Germer performed experiment to verify

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

Photoelectrons are emitted when ultraviolet light falls on:

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

Absolute motion cannot be detected

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

The length contraction happens only

A photon is considered to have

Wien's constant is measured in:

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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

Electromagnetic radiation or photons interact with matter in

Due to relative motion of observer and the frame of reference of events, time always:

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ECAT Class Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be