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Did you know a King Cobra is the biggest of all poisonous snakes and can grow to over 4 metres (13 feet) long.

Do not wait to strike till the iron is hot; but make it hot by striking – William B. Sprague

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

Q1	What kind of change takes place during photosynthesis?
A	Physical Change
B	Chemical Change
C	Both of the Above
D	None of the Above

Q2	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

Q3	A chemical change is __________.
A	Irreversible
B	Permanent
C	Both of the Above
D	Reversible and Temporary

Q4	Which of the following are produced as a result of chemical reactions?
A	Medicines
B	Detergents
C	Plastics
D	All of the Above

Q5	Iron objects become __________ by the process of rusting.
A	Strong
B	Shiny
C	Weak
D	Lustrous

Q6	Freezing of water is __________.
A	Irreversible Change
B	Chemical Change
C	Both of the Above
D	Reversible Change

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

Q9	What is the chemical symbol of Magnesium?
A	Mg
B	U
C	Ne
D	Ag

Q10	__________ change causes a new substances to be formed, with different properties.
A	Chemical
B	Physical
C	Reversible
D	None of the Above

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