9th Chemistry Chapter2 Structure of Atoms

Sr #	Questions	A	B	C	D
1	Deuterium is used to make :	light water	heavy water	soft water	hard water
2	Which radioisotope is used for the diagnosis of tumor in the body ?	cobalt -60	iodine-131	strontium-90	phosphorus -32
3	The concept of orbit was used by :	J.J Thomson	Rutherford	Bohr	Planck
4	Which one of the following is the most penetrating ?	protons	electrons	neutrons	alpha particles
5	the isotope C-12 is present in abundance of :	96.9%	97.6%	99.7%	none of these
6	The p subshell has :	one orbital	two orbitals	three orbitals	four orbitals
7	How many electrons can K-shell accommodate?	3	2	4	5
8	Which of the following statement is not correct about isotopes?	they have same atomic number	they have same number of protons	they have same chemical properties	they have same physical properties
9	How many subshells are there in second shell?	2s and p	2d and 2p	2s and 2d	2p and 2f
10	When U-235 breaks up, it produces :	electrons	neutrons	protons	nothing
11	The mass of electron is :	9.106X10^-28 g	1.674 X10^-24 g	1.672 X10^-24 g	1.66X10^-24 g
12	M shell has sub-shell that can accommodate 6 electrons is	s	d	f	p
13	The nucleus of an atom is composed of :	Electrons	Electrons and protons	Electrons and neutrons	Protons and neutrons
14	Which one of the following shell consists of three subshells?	O shell	N shell	L shell	M shell
15	______ shell consists of three subshells.	O shell	N shell	L shell	M shell
16	Which isotope is commonly used to irradiate cancer cells?	Iodine-123	Carbon-14	Cobalt-60	Iodine-131
17	Chlorine has two isotopes, both of which have	same mass number.	same number of neutrons.	same number of electrons.	different number of protons.
18	How many the maximum number of electrons that can be accommodated in a p-subshell?	Six electrons	Five electrons	Three electrons	Two electrons
19	Rutherford used ……….particles in his experiments.	He atoms	He+	He+2	He-2
20	According to Bohr atomic model :	Each orbit has fixed energy, so each orbit is called sub-energy level.	The energy of the electron is inversely proportional to its distance from the nucleus.	Light is absorbed when an electron jumps a lower energy orbit.	The further the electron is from the nucleus, the more energy it has.
21	Which one of the following results in the discovery of proton ?	cathode rays	canal rays	X-rays	alpha rays
22	Which isotope is used in nuclear reactors?	U-234	U-238	U-235	All of these