1311: With reference to 'fuel cells' in which hydrogen-rich fuel and oxygen are used to generate electricity. Consider the following statements :
1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products.
2. Fuel cells can be used for powering buildings and not for small devices like laptop computers.
3. Fuel cells produce electricity in the form of Alternating Current (AC).
Which of the statements given above is / are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
1312: Antigen is a substance which
(a) destroys harmful bacteria
(b) is used to treat poisoning
(c) lowers body-temperature
(d) stimulates formation of antibody
1313: Mixed farming means:
(a) Simultaneous cultivation of a number of crops in a single field
(b) Alternate cropping in a field
(c) Growing fruits and vegetables in the same field
(d) None of these
1314: The monthly incomes of Peter and Paul are in the ratio of 4 : 3. Their expenses are in the ratio of 3 : 2. If each saves Rs. 600 at the end of the month, their monthly incomes respectively are (in rupees)
(a) 3200 and 2400
(b) 2800 and 2100
(c) 2400 and 1800
(d) 2000 and 1500
1315: 'Bio Carbon Fund Initiative for Sustainable Forest Landscapes' is managed by the
(a) Asian Development Bank
(b) International Monetary Fund
(c) United Nations Environment Programme
(d) World Bank