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 articles made of plastics 'can be recycled' and which 'cannot be recycled'?
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 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
Which of the following plastics do not have cross-links between their polymer chains?
A. Nylon B. Melamine C. Terylene D. Bakelite
(a) A and B (b) B and C (c) A and C (d) C and D