Two cylinders of same volume have their radii in the ratio 1:6, then
ratio of their heights is __________.
Two cylinders of equal volume have heights in the ratio 1:9. The
ratio of their radii is __________.
When a candle burns, both physical and chemical changes take place.
Identify these changes. Give another example of a familiar process in
which both the chemical and physical changes take place.
Two cylinders A and B are formed by folding a rectangular sheet of
dimensions 20 cm × 10 cm along its length and also along its breadth
respectively. Then volume of A is ________ of volume of B.
When baking soda is mixed with lemon juice, bubbles are formed with
the evolution of a gas. What type of change is it? Explain.
Fill in the blanks in the following statements:
(a) When carbon dioxide is passed through lime water, it turns milky
due to the formation of _________.
(b) The chemical name of baking soda is _________.
(c) Two methods by which rusting of iron can be prevented are
_________ and _________.
(d) Changes in which only _________ properties of a substance change
are called physical changes.
(e) Changes in which new substances are formed are called _________
changes.
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