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

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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	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
2	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
3	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
5	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
6	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
7	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
8	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
9	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
10	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same 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

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

When a platinum wire is heated, it appears dull red at about

the dilation of time applies to the timing processes which are:

Intensity of light determines the:

Wave nature of particle was proposed by

Electromagnetic -radiation means:

In photoelectric effect the energy of ejected electrons depend on

The photon of radio-waves has energy of about

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

The concept of direction and position are purely

According to the special theory of relativity, a moving clock

When a platinum wire is heated, it appears white at

Newton's law of motion do not hold in

Photoelectrons are emitted when ultraviolet light falls on:

Victor de-Brogile received the Nobel prize in physics in

Compton shift refers to:

The unit of work function is:

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

The special theory of relatively treats the problems involving:

0.1 kg mass will be equivalent to the energy

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

The positron was discovered by:

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

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

In order to produce pair production, a photon must have a energy

In the compton's effect, it is found that the wavelength of incident x-rays is

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

de-Broglies hypthesis was experimentally verified by

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

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

ECAT Physics Chapter 19 Important MCQ's

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