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 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
2	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
3	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
4	The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
5	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
6	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
7	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
8	As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:	A. Smaller B. Lerger C. Same D. Much larger
9	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
10	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr

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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

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

The special theory of relativity is based on the

The unit of work function is:

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

When a platinum wire is heated, it appears white at

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

Photoelectric effect takes place with a photon of:

The concept of direction is purely:

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

The nature of radiations emitted by a hot body depends upon its:

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

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

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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

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

In photoelectric effect the energy of ejected electrons depend on

A black body is

The length contraction happens only

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

de-Broglies hypthesis was experimentally verified by

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

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

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

Photocell is a device which converts

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

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

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

An inertial frame is that frame in which

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

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

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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:

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