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(d) All the above
(d) White powder
(b) red for live wire and black for neutral wire.
(b) the iris makes the pupil contract.
(a) chlorofluorocarbon compounds.
The flowers that act as indicators are
(d) All the above
(d) All the above
See lessSilvery magnesium ribbon on burning changes to
(d) White powder
(d) White powder
See lessIn domestic electric circuits the colour of insulation covers of wires in the supply line is generally
(b) red for live wire and black for neutral wire.
(b) red for live wire and black for neutral wire.
See lessWhen the light is very bright
(b) the iris makes the pupil contract.
(b) the iris makes the pupil contract.
See lessDepletion of ozone is mainly due to
(a) chlorofluorocarbon compounds.
(a) chlorofluorocarbon compounds.
See less