A. bad material used
B. liquid being very hot
C. poor workmanship
D. uneven expansion

A. Alfred Einstein
B. Ernest Lawrence
C. Cavendish
D. W.H. Carothers

A. bat
C. penguin
B. kangaroo
D. kite

A. lives on grass and roots
B. lives under water
C. lives on trees
D. has long sharp front teeth

A. Lord Lister
B. Alexander Fleming
C. Karl Landsteiner
D. Walter Reed

A. liquid energy
B. potential energy
C. kinetic energy
D. fossil energy

A. chemical change
B. radium
C. spectroscopy
D. uranium

A. vitamin A
B. vitamin D
C. ascorbic acid.
D. thiamine

A. bifocal glasses
B. cylindrical lenses
C. concave spherical lenses
D. convex lenses

A. to save them from evaporation of moisture
B. to discourage their being eaten up by animals
C. it is natural phenomenon
D. to avoid absorption of excessive heat