411: Match List I (Naturally occurring substances) with List II (Elements) and select the correct answer using the codes given below the Lists:
List I
I. Diamond
II. Marble
III. Sand
IV. Ruby
List II
(A) Calcium
(B) Silicon
(C) Aluminium
(D) Carbon
Codes:
(a) I-C, II-A, III-B, IV-D
(b) I-D, II-B, III-A, IV-C
(c) I-B, II-A, III-C, IV-D
(d) I-D, II-A, III-B, IV-C
414: If water pollution continues at its present rate, it will eventually
(a) stop water cycle
(b) prevent precipitation
(c) make oxygen molecules unavailable to water plants
(d) make nitrate unavailable to water plants
415: The easiest way of finding out the nutritional status for large number of children in a short time is by:
(a) Studying their behaviour
(b) Studying their hair, face and eyes
(c) Measuring their height and weight
(d) All of the above