311: Consider the following:
Carbon monoxide
Methane
Ozone
Sulphur dioxide
Which of the above are released into atmosphere due to the burning of crop/biomass residue?
(a) 1 and 2 only
(b) 2, 3 and 4 only
(c) 1 and 4 only
(d) 1, 2, 3 and 4
312: If the stars are seen to rise perpendicular to the horizon by an observer, he is located on the
(a) Equator
(b) Tropic of Cancer
(c) South Pole
(d) North Pole
313: 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
314: Consider the following statements:
As per 2001 Census
1. The two States with the lowest sex ratio are Haryana and Punjab.
2. The two States with the lowest population per sq km of area are Meghalaya and Mizoram.
3. Kerala has both the highest literacy rate and sex ratio.
Which of the statements given above is/are correct?
(a) 3 only
(b) 2 and 3
(c) 1 and 2
(d) 1 and 3
315: Plants take nitrogen in the form of:
(a) Nitrites
(b) Ammonia
(c) Nitrates
(d) Element