9th Chemistry Chapter2 Structure of Atoms

Sr #	Questions	A	B	C	D
1	How many subshells are there in second shell?	2s and p	2d and 2p	2s and 2d	2p and 2f
2	The mass of electron is :	9.106X10^-28 g	1.674 X10^-24 g	1.672 X10^-24 g	1.66X10^-24 g
3	Which one of the following results in the discovery of proton ?	cathode rays	canal rays	X-rays	alpha rays
4	The nucleus of an atom is composed of :	Electrons	Electrons and protons	Electrons and neutrons	Protons and neutrons
5	______ shell consists of three subshells.	O shell	N shell	L shell	M shell
6	the isotope C-12 is present in abundance of :	96.9%	97.6%	99.7%	none of these
7	Chlorine has two isotopes, both of which have	same mass number.	same number of neutrons.	same number of electrons.	different number of protons.
8	Which one of the following shell consists of three subshells?	O shell	N shell	L shell	M shell
9	Which one of the following is the most penetrating ?	protons	electrons	neutrons	alpha particles
10	When U-235 breaks up, it produces :	electrons	neutrons	protons	nothing
11	How many electrons can K-shell accommodate?	3	2	4	5
12	Rutherford used ……….particles in his experiments.	He atoms	He+	He+2	He-2