ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

Top Scorers Of Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics MCQ`s Test

Sr.#	Question	Answer
1	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
2	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
3	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
4	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
5	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
6	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
7	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
8	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
9	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
10	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity