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Class VII >> Science >> Physical and Chemical Changes >> A1

Q1	__________ consists of two or more substances simply mixed together, but not chemically combined.
A	Element
B	Mixture
C	Compound
D	Molecule

Q2	What is the chemical symbol of Magnesium?
A	Mg
B	U
C	Ne
D	Ag

Q3	Which one of the following is an example of reversible change?
A	Melting of Ice
B	Inflating a Balloon
C	Stretching a Rubber Band
D	All of the Above

Q4	Iron objects become __________ by the process of rusting.
A	Strong
B	Shiny
C	Weak
D	Lustrous

Q5	Which of the following are produced as a result of chemical reactions?
A	Medicines
B	Detergents
C	Plastics
D	All of the Above

Q6	A chemical change is __________.
A	Irreversible
B	Permanent
C	Both of the Above
D	Reversible and Temporary

Q7	When iron is exposed to air, it forms a reddish brown layer called __________.
A	Rust
B	Zinc
C	Grease
D	None of the Above

Q8	What kind of change takes place during photosynthesis?
A	Physical Change
B	Chemical Change
C	Both of the Above
D	None of the Above

Q9	__________ change causes a new substances to be formed, with different properties.
A	Chemical
B	Physical
C	Reversible
D	None of the Above

Q10	Freezing of water is __________.
A	Irreversible Change
B	Chemical Change
C	Both of the Above
D	Reversible Change

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