27. If an alkali is slowly added to an acidic solution, the pH of the acidic solution will:
a) Increase
b) Decrease
c) Increase to 7 and then decrease
d) Decrease to 7 and then increase
e) Will remain same
28. The usual raw material for ceramics, generally found beneath the top soil is?
a) Sand
b) Slit
c) Clay
d) Plaster of Paris
e) Melamine
29. Polyamides are synthetic polymers commonly known as:
a) Synthetic rubber
b) Nylon
c) Cellulose
d) Protein
e) None of these.
30. Telephone was invented in 1876 in America by:
a) Marconi
b) Galileo
c) John Beard
d) Edison
e) Graham Bell.