TEST No. 3
Choose the correct alternative and rewrite the sentences :
(1) When Barium chloride solution is added to Sodium sulphate solution, ..................... .
(a) blue precipitate is formed
(a) blue precipitate is formed
(b) white precipitate is formed
(c) green precipitate is formed
(d) no reaction takes place
(2) When a ray of light travels from air to glass and strikes the surface of separation at 90° to the surface, then it ..................... .
(a) bends towards the normal
(b) bends away from the normal
(c) passes without bending
(b) bends away from the normal
(c) passes without bending
(d) reflects into air
(3) In Hope’s apparatus when the temperature of water drops from 4oC to 3oC, water .................. .
(a) Remains still
(b) moves upwards
(c) moves downwards
(d) freezes solid
(4) Due to ..............., vegetable oil is converted into vanaspati ghee.
(a) Hydrogenation
(b) Chlorination
(c) Dehydration
(c) Dehydration
(d) Polymerization
(5) Rakesh performs the experiment of tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He observes that in all cases ..................... .
Ans. (a)