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	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
2	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
3	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
4	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
5	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
6	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
7	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
8	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
9	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
10	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these

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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

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

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

The value of threshold frequency for different metals is

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

The energy of the 4th orbit in hydrogen atom is

The special theory of relativity treats problems invoving

Electromagnetic radiation or photons interact with matter in

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

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

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

0.1 kg mass will be equivalent to the energy

de-Broglies hypthesis was experimentally verified by

Photocell is a device which converts

The unit of work function is:

The length contraction happens only

In photoelectric effect the energy of ejected electrons depend on

Newton's law of motion do not hold in

The concept of direction is purely:

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

When a platinum wire is heated, it appears white at

There is no way to detect:

The Nobel Prize on the explanation of photoelectric effect was awarded to:

An intertial frame of reference is a frame of reference which is

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

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

Strictly speaking, the earth is:

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

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

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

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

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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: