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Question-1
The sum of the number of protons(p) and the number of neutrons(N)present in its nucleus is

(A) Atomic number	(B) Mass number
(C) Isotopic mass	(D) Average mass

Question-2
When the two combining atoms share only one pair of electrons, the bond formed is called

(A) Single covalent bond	(B) Double covalent bond
(C) Triple covalent bond	(D) Co-ordinate bond

Question-3
The atom which accepts the electron pair is called the

(A) Donor atom	(B) Acceptor atom
(C) Shared atom	(D) Bonded atom

Question-4
Who discovered Radioactivity?

(A) Becquerel	(B) Rutherford
(C) Marie curie	(D) Pierre curie

Question-5
Free elements have a valency of

(A) zero	(B) one
(C) two	(D) three

Question-6
The atom which provides an electron pair is called as the

(A) Donor atom	(B) Acceptor atom
(C) Shared atom	(D) Bonded atom

Question-7
Alkali metals show a valency of

(A) +1	(B) -1
(C) -2	(D) +2

Question-8
Atoms of all elements are

(A) Neutral	(B) Positively charged
(C) Negatively charged	(D) Same

Question-9
The particles in the anode rays, when hydrogen gas was used in the discharge tube, was given the name

(A) Proton	(B) Electron
(C) Neutron	(D) Positron

Question-10
Who described that an atom consists of a positively charged nucleus, which is surrounded by electrons moving around it?

(A) Rutherford	(B) J.J.Thomson
(C) Goldstein	(D) Bohr

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Std 8

ICSE/ISC

Practice in Related Chapters
Hydrogen
Structure of Atom
Transformation of Substances
Metals and nonmetals
Carbon and its Compounds