
Q1. Metallic vessels can be used for cooking because metals are
(a) good conductors of heat.
(b) bad conductors of heat.
(c) hard and have high melting point.
(d) Both (a) and (c)
Q2. Plastic containers sometimes when heated gets deformed because plastic
(a) is a good conductor of heat.
(b) is a bad conductor of heat.
(c) does not have relation with the conduction of heat.
(d) is a soft material.
Q3. Air is grouped as:
(a) Transparent
(b) Translucent
(c) Opaque
(d) Cannot be said
Q4. Sugar dissolves faster in hot water than in cold water because
(a) In hot water, the intermolecular space is more.
(b) In cold water, the intermolecular space is more.
(c) The speed of the sugar molecules increases.
(d) The speed of the sugar molecules decreases.
Q5. Mercury is used in thermometers because
(a) It is the only liquid metal.
(b) It has the shiny appearance.
(c) It has a high boiling point.
(d) All of these.
Q6. Wood floats in water because
(a) It has low density and is porous.
(b) It is lighter than air.
(c) It has a high density and is porous.
(d) It has low density and is non-porous.
Q7. Wool is used for making clothes for fire fighters because
(a) It has lower ignition temperature than other fibers.
(b) It has higher ignition temperature than other fibers.
(c) It can hold heat for long time.
(d) It cannot hold heat for long time.
Q8. Copper is generally used for making electrical wires because
(a) It is a good conductor of electricity.
(b) It is not expensive as other metals.
(c) It is ductile.
(d)All of these.
Q9. Silk requires dry-cleaning because
(a) It is synthetic fiber composed of protein.
(b) It is natural fiber composed of protein.
(c) It is very expensive.
(d) It is shiny in appearance.
Q10.Cotton is warm in winters and cools in summers because
(a) It is porous in nature.
(b) It can hold good amount of air.
(c) It is softer than other fibers.
(d) Both (b) and (c).
Ans.2 (b)
Ans.3 (a)
Ans.4 (c)
Ans.5 (d)
Ans.6 (a)
Ans.7 (b)
Ans.8 (d)
Ans.9 (b)
Ans.10 (d)
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