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Question-1
Pure substances possess:
(A)
Variable melting points and boiling points
(B)
Non uniform
(C)
Variable properties
(D)
Fixed melting points and boiling points
Question-2
A mixture is a / an:
(A)
Pure substance
(B)
Impure substance
(C)
Some are pure and others are impure
(D)
Always gas
Question-3
Identify the mixture from the following.
(A)
Carbon dioxide
(B)
Iron
(C)
Hydrogen
(D)
Air
Question-4
Sieving can be used only when the components of the mixture have:
(A)
Different melting points
(B)
Different sizes
(C)
Different boiling points
(D)
Different specific gravities
Question-5
Winnowing is useful only when:
(A)
Two solids have different melting points
(B)
Two solids have different boiling points
(C)
Two solids have different magnetic properties
(D)
Two solids have different weights
Question-6
Some iron fillings are mixed with sand. We can separate them using magnetic separation method. This method is applicable only when:
(A)
Magnetic substances are mixed up with non magnetic substances
(B)
Magnetic substances are mixed up with magnetic substances
(C)
Magnetic substances are heated beyond their curie temperatures
(D)
Two magnetic substances have equal melting points
Question-7
You can use decantation to separate:
(A)
Two miscible liquids
(B)
Two immiscible liquids
(C)
Two metals in an alloy
(D)
Solid- solid water
Question-8
To separate ammonium chloride from common salt, we use:
(A)
Filtration
(B)
Sedimentation
(C)
Sieving
(D)
Sublimation
Question-9
Choose the substance that shows sublimation.
(A)
Naphthalene
(B)
Toluene
(C)
Kerosene
(D)
Water
Question-10
A compound has:
(A)
Only one kind of atom
(B)
Only one kind of element
(C)
A mixture of elements and molecules
(D)
Only one kind of molecules
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Cambridge Secondary Grade 6
IGCSE
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