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	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
2	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
3	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
4	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
5	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
6	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
7	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
8	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
9	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
10	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v