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	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
2	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
3	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
4	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
5	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
6	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
7	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
8	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
9	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references 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