Which of the following statement is incorrect for a chemical reaction?
(a) Heat may be given out but never absorbed.
(b) Sound may be produced.
(c) A colour change may take place.
(d) A gas may be evolved.
In which one of the following countries, the ‘Earth Summit’ was held?
(a) the UK (c) Brazil
(b) Mexico (d) China
Paheli’s mother made a concentrated sugar syrup by dissolving
sugar in hot water. On cooling, crystals of sugar got separated.
This indicates a –
(a) physical change that can be reversed.
(b) chemical change that can be reversed.
(c) physical change that cannot be reversed.
(d) chemical change that cannot be reversed.
Galvanisation is a process used to prevent the rusting of which
of the following?
(a) Iron
(b) Zinc
(c) Aluminium
(d) Copper
Iron pillar near the Qutub Minar in Delhi is famous for the
following facts. Which of these facts is responsible for its long
stability?
(a) It is more than 7 metres high.
(b) It weighs about 6000 kg.
(c) It was built more than 1600 years ago.
(d) It has not rusted after such a long period.
Biodiversity is richer in :
(a) Tropical Regions (c) Temperate Regions
(b) Polar Regions (d) Oceans
A man painted his main gate made up of iron, to
(i) prevent it from rusting.
(ii) protect it from sun.
(iii) make it look beautiful.
(iv) make it dust free.
Which of the above statement(s) is/are correct?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) only (ii)
(d) (i) and (iii)
Which of the following is/are true when milk changes into
curd?
(i) Its state is changed from liquid to semi solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.
Choose the correct option from below :
(a) (i) and (ii) are correct
(b) (ii) and (iii) are correct
(c) (i), (iii) and (iv) are correct
(d) (i) to (iv) are correct
A chemical change may involve –
(a) change in colour only
(b) change in temperature only
(c) evolution of gas only
(d) any or all of the above
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