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	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
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 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
4	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
5	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
6	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
7	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
8	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
9	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
10	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

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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

A black body is

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

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

At the temperature, a body emits radiation which is principally

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

According to the special theory of relativity, time is

The value of threshold frequency for different metals is

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

0.1 kg mass will be equivalent to the energy

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

The length contraction happens only

Electromagnetic -radiation means:

According to the special theory of relativity, a moving clock

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

The existence of position was predicted by Dirace in

When a platinum wire is heated, it appears yellow at

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

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

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

the symbol to be used in relativity problems denotes:

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

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

Pair production is the phenomenon in which

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

Which of the following phenomenon proves the particle nature of light

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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

The energy of the 4th orbit in hydrogen atom is

S.I. unit of planks constant is

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

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ECAT Physics Chapter 19 Important MCQ's

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