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

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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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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	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
2	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
3	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
4	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
5	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
6	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
7	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
8	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
9	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
10	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature

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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

Compton shift refers to:

At the temperature, a body emits radiation which is principally

The energy of the 4th orbit in hydrogen atom is

Wien's constant is measured in:

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

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

Practically the quantity v/c is always:

The energy of photon 'E' is proported to

Momentum is a parameter associated with

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

The existence of position was predicted by Dirace in

When platinum wire is heated, it appears cherry red at

Converse of pair production is known as

Intensity of light determines the:

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

Compton was awarded Nobel prize in physics in

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

An intertial frame of reference is a frame of reference which is

Wave nature of particle was proposed by

When a platinum wire is heated, it appears dull red at about

According to the special theory of relativity, a moving clock

There is no way to detect:

The length contraction happens only

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

Electromagnetic radiation or photons interact with matter in

Position was discovered by Carl Anderson in

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

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

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:

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

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