Which of the following increase the fertility of soil ?

A. Lactobacillus bacteria B. Rhizobium bacteria C. Spirogyra algae D. Blue-green algae

(a) A and B (b) B and C (c) A and D (d) B and D

Which of the following plastic objects can be recycled ?

A. Electric socket B. Polythene bag C. PVC pipe D. Ashtray

(a) A and B (b) B and C (c) A and D (d) C and D

Which of the following constellations can be seen in the night sky during the winter season?

A. Orion

B. Ursa Major

C. Leo Major

D. Cassiopeia

(a) A and B

(b) B and C

(c) A and D

(d) B and D

Which of the following metals are produced by the electrolysis of their molten compounds ?
A. Copper
B. Silver
C. Aluminium
D. Sodium

(a) A and B
(b) B and C
(c) C and D
(d) only D

74 Which of the followig represent correct values for the normal atmospheric pressure ?
A. 101.3 kilopascals B.76 mm of mercury C.101.3 pascals D.76 cm of mercury
(a) A and B (b) B and C (c) A and D (d) B and D