Anaerobic bacteria digest animal waste and produce biogas (Change – A).
The biogas is then burnt as fuel (Change – B). The following
statements pertain to these changes. Choose the correct one.
(i) Process – A is a chemical change.
(ii) Process – B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.
In question, state whether the statement are true (T) or false (F).
Two cylinders with equal volume will always have equal surface areas
In question, state whether the statement are true (T) or false (F).
A cube of side 3 cm painted on all its faces, when sliced into 1 cubic
centimetre cubes, will have exactly 1 cube with none of its faces
painted
In question, state whether the statement are true (T) or false (F).
The area of a trapezium become 4 times if its height gets doubled.
The gas we use in the kitchen is called liquified petroleum gas (LPG). In
the cylinder it exist as a liquid. When it comes out from the cylinder it
becomes a gas (Change – A) then it burns (Change – B). The following
statements pertain to these changes. Choose the correct one.
(i) Process – A is a chemical change.
(ii) Process – B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.
In question, state whether the statement are true (T) or false (F).
Two cuboids with equal volumes will always have equal surface areas.
In question, state whether the statement are true (T) or false (F).
The surface area of a cuboid formed by joining face to face 3 cubes of
side x is 3 times the surface area of a cube of side x.
Explain why rusting of iron objects is faster in coastal areas than in
deserts.
In question, state whether the statement are true (T) or false (F).
The areas of any two faces of a cuboid are equal
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