Chemistry Class 9th
181-Electrons revolve around nucleus in circular paths , called
A) Orbit
B) Shell
C) Both a and b
182-The charge on an electron is
A) -1.602 × 1019 coulombs
B) 1.602 × 1011 coulombs
C) 1.602 × 1015 coulombs
183. Protons is -------times is heavier than electrons
A) 1850
B) 1837
C) 1819
184. The charge on an electron is
A) 1.602 × 1019 coulombs
B) 1.602 × 1011 coulombs
C) 1.602 × 1015 coulombs
185. The mass of proton is equal to
A) 1.0072766
B) 1.087654
C) 1.0987654
186- The mass of neutron is equal to
A) 1.0086654
B) 1.0072766
C) 1.6022
187. Neutron is_______ times heavier than proton
A) 1842
B) 1879
C) 1860
188-The arrangement of electons in orbits around the nucleus is called
A) Configuration
B) Electronic configuration
C) Both a and b
189- The first shell around a nucleus is called
A) K-shell
B) M-shell
C) L-shell
190-The number of electones in a particular orbit is given by formula
A) 2n
B) n
C) 2n2
191- The maximum no, of electrons in first shell is
A) 2
B) 8
C) 18
192- The maximum no, of electrons in 2nd shell is
A) 2
B) 8
C) 18
193- As the shell no. increases , the energy of electrons also
A) Increases
B) Decreases
C) Remains same
194- There are ------ sub-shells
A) 2
B) 3
C) 4
195- The sub-shells are represented by
A) K,L,M,N
B) s,p,d,f
C) Both a and b
196- Sub-shell s stands for
A) Super
B) Small
C) Sharp
197- Sub-shell p stands for
A) Prior
B) Principal
C) Both a and b
198-Sub-shell d stands for
A) Diffused
B) Principal
C) None of these
199- The maximum no, of electrons in 3rd shell is
A) 2
B) 8
C) 18
200- s sub-shell can accommodate maximum of ------- electrons
A) 2
B) 6
C) 10