2331: The marine animal called dugong which is vulnerable to extinction is a/an
(a) Shark
(b) Mammal
(c) Amphibian
(d) Bony fish
2332: Which of the following chemicals in automobile-exhaust can cause cancer?
(a) Carbon monoxide
(b) Polycyclic hydrocarbons
(c) Lead
(d) Oxides of nitrogen
2333: The latitudes that pass through Sikkim also pass through
(a) Himachal Pradesh
(b) Punjab
(c) Jammu & Kashmir
(d) Rajasthan
2334: Three important micronutrients essential for humans are
(a) Copper, zinc and iodine
(b) Zinc, copper and potassium
(c) Nitrogen, molybdenum and iodine
(d) Sulphur, copper and iron
2335: In a wooden box there are 3 red and 4 black balls. If two balls are taken out Simultaneously (without looking at them), then the probability of both the balls being red is
(a) Zero
(b) 1/7
(c) 2/7
(d) 3/7