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	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
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 Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
4	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
5	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
6	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
7	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
8	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
9	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
10	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

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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

Victor de-Brogile received the Nobel prize in physics in

The positron was discovered by:

de-Broglies hypthesis was experimentally verified by

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

Newton's law of motion do not hold in

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

According to the special theory of relativity, time is

The special theory of relativity is based on:

At the temperature, a body emits radiation which is principally

The year when A.H. compton was awarded Nobel Prize is:

According to the special theory of relativity

Momentum is a parameter associated with

Compton was awarded Nobel prize in physics in

G.P. Thomson observer experimentally that electrons and neutrons possess

The general theory of relativity treats problems involving

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

Pair production is the phenomenon in which

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

The unit of work function is:

The energy of photon 'E' is proported to

Which of the following phenomenon proves the particle nature of light

A photon is considered to have

Practically the quantity v/c is always:

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

S.I. unit of planks constant is

The special theory of relativity treats problems invoving

Which one of the following physical quantities changes with relativistic speed

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

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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