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	Radioactivity is	A. self disruptive activity B. spontaneous activity C. exhibited by all elements under proper conditions D. both 'a' and 'b'
2	The number of protons inside a nucleus is called	A. mass number B. atomic weight C. atomic number D. none of these
3	The isotope/s of hydrogen is /are:	A. Protium B. Deuterium C. Tritium D. Both (A) and (B)
4	Fraction of the decaying atoms per unit time is called	A. decay atom B. decay element C. decay constant D. decay
5	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
6	The number of isotopes of hydrogen are	A. 2 B. 1 C. 3 D. 4
7	Proton was discovered by Rutherford in	A. 1915 B. 1906 C. 1910 D. 1920
8	When certain nucleus emits anα particle, its mass number:	A. Increases by one B. Decreases by one C. Remain same D. Decreases by four
9	The chemical behaviour of an atom is determined by	A. binding energy B. atomic number C. mass number D. number of isotopes
10	Radium was discovered by:	A. Becquerel B. Marie curie C. Pierre curie D. Rutherford