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	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
2	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
3	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
4	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
5	The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
6	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
7	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
8	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
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	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate

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

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

When a platinum wire is heated, it appears white at

The special theory of relativity is based on:

When a platinum wire is heated, it appears orange red at

The energy of the 4th orbit in hydrogen atom is

A black body is

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

The general theory of relativity treats problems involving

Compton shift refers to:

According to the special theory of relativity

The nature of radiations emitted by a hot body depends upon its:

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

The idea of quantization of energy was proposed by:

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

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

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

A non-inertial frame of reference is one, in which

The energy of a photon is represented by

Photoelectrons are emitted when ultraviolet light falls on:

Which one of the following physical quantities changes with relativistic speed

Photocell is a device which converts

At the temperature, a body emits radiation which is principally

0.1 kg mass will be equivalent to the energy

Converse of pair production is known as

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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ECAT Physics Chapter 19 Important MCQ's

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