ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Sr.#	Question	Answer
1	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:	A. Smaller B. Lerger C. Same D. Much larger
2	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
3	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
4	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
5	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
6	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
7	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
8	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
9	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
10	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red