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 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	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
2	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
3	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
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 value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
6	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
7	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
8	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
9	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
10	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928

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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

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

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Practically the quantity v/c is always:

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

The positron was discovered by:

At the temperature, a body emits radiation which is principally

Strictly speaking, the earth is:

Electromagnetic -radiation means:

the symbol to be used in relativity problems denotes:

The energy of a photon is represented by

Compton was awarded Nobel prize in physics in

A black body is

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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

Wave nature of particle was proposed by

Electromagnetic radiation or photons interact with matter in

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

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

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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

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

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

The unit of work function is:

According to the special theory of relativity, a moving clock

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

The idea of quantization of energy was proposed by:

The energy of the 4th orbit in hydrogen atom is

Converse of pair production is known as

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ECAT Physics Chapter 19 Important MCQ's

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