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	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
2	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
3	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
4	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
5	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
6	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
7	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
8	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
9	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
10	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C