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	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
2	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
3	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
4	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
5	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
6	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
7	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
8	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
9	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
10	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these