ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	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
2	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
3	The special theory of relatively treats the problems involving:	A. Inertial frames of reference B. Non-inertial frames C. Non-accelerated frame D. Botha (A) and (C)
4	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
5	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
6	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
7	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
8	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
9	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
10	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy

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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

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

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

A photon is considered to have

When a platinum wire is heated, it appears yellow at

The special theory of relatively treats the problems involving:

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

In the compton's effect, it is found that the wavelength of incident x-rays is

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

The general theory of relativity treats problems involving

The unit of work function is:

A particle having mass and charge equal to that of an electron is called:

Which one of the following physical quantities changes with relativistic speed

The energy of a photon is represented by

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Electromagnetic radiation or photons interact with matter in

When a position comes close to an electron they annihilate into

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

The length contraction happens only

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

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

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

Photocell is a device which converts

Practically the quantity v/c is always:

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

There is no way to detect:

When platinum wire is heated, it appears cherry red at

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

S.I. unit of planks constant is

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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