ECAT Pre Engineering Physics Chapter 21 online mcq test with answers for chapter 21 (Nuclear Physics)

Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test

Sr. #	Questions	Answers Choice
1	When radioactive nucleus emits aβ-particle, the proton-neutron ratio	decrease increase same none of these
2	Phenomenon of radioactivity is due to disintegration of	nucleus neutron proton molecule
3	A curie represents a very strong source of	<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particle</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">β-particle</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">γ-particle</span> none of these
4	The rate of decay of radioactive substance	is constant decrease exponentially with time varies inversely as time decreases linearly with time
5	If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by	-4 4 2 1
6	An alpha particle has a charge of	+2e -2e -e +3e
7	When a nucleus emits an alpha particles, its charge number decreases by	3 2 6 5
8	When a nucleus emits an alpha particle, it atomic mass decreased by	2 1 4 3
9	Radioactivity is	self disruptive activity spontaneous activity exhibited by all elements under proper conditions both 'a' and 'b'
10	Curie is a unit of	reluctance resistivity binding energy radioactivity
11	Alfa , beta and gamma rays are emitted from a radio-active substance	spontaneously when it is heated when it is exposed to light When it interacts with the other particle
12	Gamma rays consist of steam of	electron proton photons all of these
13	Alfa particles are	hydrogen nuclei helium nuclei electrons photons
14	Beta particles are	hydrogen nuclei helium nuclei electrons photons
15	Maric Curie and Pieree Curie discovered two new radioactive elements, which are called	polonium uranium uranium and radium polonium and radium none of these

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