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

ECAT Physics Chapter 19 Dawn of Modern 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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