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

Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics Physics Online Test

Sr. #	Questions	Answers Choice
1	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	Newton Joule Joule-Sec Joule-s<sup>-1</sup> Watt
2	Max Planck received the Nobel Prize for his discovery of energy quants in:	1718 AD 1918 AH 1818 AD 1918 AD None of these
3	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	Wien's constant Stefen's constnat Planck's constant Boltzmann's constant None of these
4	Wien's constant is measured in:	Metre per kelviin Metre kelvin Kelvin per meter Joules Dynes
5	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	Lummer Planck Pringsheim Both (A ) and (B) Both (A) and (C)
6	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	Yellow Orange red Dull red White Cherry red
7	The nature of radiations emitted by a hot body depends upon its:	Metarial Temperature colour Volume Length
8	When the atomic particle are moving with velocities approaching that of light:	Newton's laws become valid Relativistic effects become prominent Botha(A) and (B) are valid Neither (A)nor (B) There mass becomes zero.
9	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:	Smaller Lerger Same Much larger None of these
10	the dilation of time applies to the timing processes which are:	Physical Chemical Biological All of these None of these
11	Due to relative motion of observer and the frame of reference of events, time always:	Dilates itself Contracts itself Stretches itself Both (A) and (C) None of these
12	Practically the quantity v/c is always:	less than one Equal to one Greater then one all of these None of these
13	the symbol to be used in relativity problems denotes:	Dilated time Proper time Life time Half time None of these
14	There is no way to detect:	Absolute uniform motion Accelerated motion State rest State of motion None of these
15	The special theory of relativity is based on:	Four postulates Three postulates Two postulates One postulate None of these

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