1666: Due to their extensive rice cultivation, some regions may be contributing to global warming. To what possible reason/reasons is this attributable ?
1. The anaerobic conditions associated with rice cultivation cause the emission of methane.
2. When nitrogen based fertilizers are used, nitrous oxide, is emitted from the cultivated soil.
Which of the statements given above is/are correct ?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
1667: Which one of the following countries recently upgraded its defence agency to a full defence ministry?
(a) Switzerland
(b) Japan
(c) Italy
(d) Thierry Henry
1668: Consider the following statements :
In a nuclear reactor, self-sustained chain reaction is possible, because
I. more neutrons are released in each of the fission reactions.
II. the neutrons immediately take part in the fission process.
III. the fast neutrons are slowed down by Graphite.
IV. every neutron realeased in the fission reaction initiates further fission.
Which of these statements are correct ?
(a) I, II and III
(b) I and III
(c) II and IV
(d) II, III and IV
1669: Assertion (A) :
The effect of labour participation in the Indian nationalist upsurge of the early 1930's was weak.
Reason (R) :
The labour leaders considered the ideology of Indian National Congress as bourgeois and reactionary.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
1670: The word Adivasi was used for the first time to refer to the tribal people by
(a) Mahatma Gandhi
(b) Thakkar Bappa
(c) Jyotiba Phule
(d) B.R. Ambedkar