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

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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
2	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
3	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
4	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
5	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
6	The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
7	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
8	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
9	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
10	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v

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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

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

The inside cavity of the black body is

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

Photocell is a device which converts

S.I. unit of planks constant is

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

When a platinum wire is heated, it appears white at

The value of the Stephen's constant for black body radiations is given by

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

The special theory of relativity is based on:

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

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

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

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

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

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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

The mass of an object will be doubled at speed

The special theory of relativity treats problems invoving

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

In photoelectric effect the energy of ejected electrons depend on

According to the special theory of relativity, a moving clock

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

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

When platinum wire is heated, it appears cherry red at

When a platinum wire is heated, it appears orange red at

Intensity of light determines the:

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

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

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

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ECAT Physics Chapter 19 Important MCQ's

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