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	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
2	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
3	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
4	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
5	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
6	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
7	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
8	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
9	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
10	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal

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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

Wave nature of particle was proposed by

Photoelectrons are emitted when ultraviolet light falls on:

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

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 value of threshold frequency for different metals is

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

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

When a position comes close to an electron they annihilate into

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

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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

As the light shines on the metal surface, the electrons are ejected

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

The general theory of relativity treats problems involving

The special theory of relativity is based on:

The unit of work function is:

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

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

According to the special theory of relativity, time is

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

The concept of direction is purely:

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

Compton studied the scattering of x-rays by loosely bound electrons from:

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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

An inertial frame is that frame in which

Electromagnetic -radiation means:

The photoelectric effect, the maximum energy of photoelectrons depends on the

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ECAT Physics Chapter 19 Important MCQ's

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