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 a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
2	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
3	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
4	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
5	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
6	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
7	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
8	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
9	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
10	Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in	A. 1890 B. 1895 C. 1900 D. 1905

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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 photon of radio-waves has energy of about

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

Momentum is a parameter associated with

The special theory of relativity is based on:

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

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

A photon is considered to have

Wave nature of particle was proposed by

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

An inertial frame is that frame in which

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Converse of pair production is known as

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

The concept of direction and position are purely

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

The special theory of relativity treats problems invoving

The mass of an object will be doubled at speed

The value of the plank's constant 'h' is given by

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

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

According to the special theory of relativity, time is

The positron was discovered by:

The Einstein's changes in length, mass and time are not observed in common life because

Electromagnetic -radiation means:

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

There is no way to detect:

The Stephen-Boltzmann law for the black body radiation is given by

According to the special theory of relativity, a moving clock

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

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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: