ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

Top Scorers Of Physics ECAT Pre Engineering Chapter 21 Nuclear Physics MCQ`s Test

Sr.#	Question	Answer
1	The number of all the protons and neutrons in a nucleus is known as	A. atomic number B. mass number C. charge number D. none of these
2	The chemical behaviour of an atom is determined by	A. binding energy B. atomic number C. mass number D. number of isotopes
3	Rate of decay is actually described by.	A. Half line B. Decay constant C. Mean life D. Total life
4	Neutrons are	A. positive charge B. negatively charged C. massless D. neutral
5	Which are not the elementary particles?	A. Photons B. Leptons C. Hadrons D. Quarks
6	Neutron was disvovered by:	A. Rutherford in 1920 B. Chadwick in 1922 C. Bohr in 1913 D. Compton in 1927
7	Pair production take place when energy ofγ-rays photon is	A. equal to 1.02 Mev- B. greater than 1.02 Mev C. less than 1.02 Mev D. none of these
8	The rate of decay of a radioactive substance	A. decrease exponentially with time B. decreases linearly with time C. increases linearly with time D. increases exponentially with time
9	Different radioactive material have	A. same half lives B. different half lives C. same mean lives D. same total lives
10	The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called	A. nuclear fission B. nuclear fusion C. man defect D. radioactivity