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	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
2	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
3	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
4	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
5	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
6	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
7	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
8	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
9	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
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

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

There is no way to detect:

An inertial frame is that frame in which

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

Pair production is the phenomenon in which

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

The special theory of relativity treats problems invoving

The special theory of relativity is based on:

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

de-Broglies hypthesis was experimentally verified by

According to the special theory of relativity, a moving clock

The photon of radio-waves has energy of about

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

According to the special theory of relativity

Photoelectrons are emitted when ultraviolet light falls on:

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Converse of pair production is known as

The concept of direction is purely:

The special theory of relativity is based on the

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

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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

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

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Electromagnetic -radiation means:

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

Absolute motion cannot be detected

A black body is

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

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:

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