Samacheer Kalvi 7th Science Is Matter Around Us Questions - 1
Question: 1
An element which is always lustrous, malleable and ductile
(A) Gas
(B) Metalloid
(C) Metal
(D) Non metal
Ans: C
Metal
Question: 2
Which of the following is a short and scientific way of representing one molecule of an element or compound?
(A) Chemical symbol
(B) Chemical formula
(C) Mathematics symbol
(D) Mathematical formula
Ans: A
Chemical symbol
Question: 3
The metals which is a liquid at room temperature
(A) Silver
(B) Mercury
(C) Chlorine
(D) Sulphur
Ans: B
Mercury
Question: 4
Oxygen, hydrogen and sulphur are examples of which of the following?
(A) Metalloids
(B) Inert gases
(C) Metals
(D) Non metals
Ans: D
Non metals
Question: 5
Which of the following is an example of a metal?
(A) Iron
(B) Water
(C) Oxygen
(D) Helium
Ans: A
Iron
Question: 6
A molecule which contains only one atom is called _____ molecule.
(A) Diatomic
(B) Triatomic
(C) Monoatomic
(D) None of these
Ans: C
Monoatomic
Question: 7
_____ is the first scientist who used the term element.
(A) Robert hook
(B) Robertr boyle
(C) Einstein
(D) Newton
Ans: B
Robertr boyle
Question: 8
The smallest unit of an element is
(A) Atom
(B) Molecule
(C) Compound
(D) None of these
Ans: A
Atom
Question: 9
_____ is a substance that is made up of three oxygen atoms chemically combined.
(A) CO2
(B) Ozone
(C) Oxygen
(D) Hydrogen
Ans: C
Oxygen
Question: 10
The graphite refill used in pencil is made of element called
(A) Sodium
(B) Silicon
(C) Graphite
(D) Carbon
Ans: D
Carbon
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