81: There are 50 students admitted to a nursery class. Some students can speak only English and some can speak only Hindi. 10 students can speak both English and Hindi. If the number of students who can speak English is 21, then how many students can speak Hindi, how many can speak only Hindi and how many can speak only English ?
(a) 21, 11 and 29 respectively
(b) 28, 18 and 22 respectively
(c) 37, 27 and 13 respectively
(d) 39, 29 and 11 respectively
82: The average of X1, X2 and X3 is 14. Twice the sum of X2 and X3 is 30. What is the value of X1 ?
(a) 20
(b) 27
(c) 16
(d) 12
83: Fat present below the skin surface in our body, acts as a barrier against
(a) loss of heat from the body
(b) loss of essential body fluids
(c) loss of salts from the body
(d) entry of harmful micro-organisms from the environment
84: With reference to Indian agriculture, which one of the following statements is correct?
(a) About 90 per cent of the area under pulses in India is rainfed.
(b) The share of pulses in the gross cropped area at the national level has double in the last two decades
(c) India accounts for about 15 per cent of the total area under rice in the world
(d) Rice occupies about 34 per cent of the gross cropped area of India
85: The chemical name for urea is:
(a) Aneurin
(b) Chloroethene
(c) Carbamide
(d) None of these