2081: Which feature of some, species of blue-green algae helps promote them as bio-fertilizers?
(a) They convert atmospheric methane into ammonia which the crop plants can absorb readily
(b) The induce the crop plants to produce the enzymes which help convert atmospheric nitrogen to nitrates
(c) They have the mechanism to convert atmospheric nitrogen into a form that crop can absorb readily
(d) The induce the roots of the crop plants to absorb the soil nitrates in larger quantities
2082: Which one of the following statements is not correct?
(a) Hepatitis B virus is transmitted much like HIV.
(b) Hepatitis B. unlike Hepatitis C, does not have a vaccine.
(c) Globally, the number of people infected with Hepatitis B and C viruses arc several times more than those infected with HIV.
(d) Some of those infected with Hepatitis B and C viruses do not show the symptoms for many years.
2083: Khetri, Kolar, Sindri and Jharia are associated with:
(a) Copper, gold, fertilisers and coal
(b) Copper, gold, coal and iron
(c) Copper, gold, coal and gypsum
(d) Iron, gold, coal and copper
2084: There are three drawers in a table. One contains two gold coins, another two silver coins, and the third, a silver coin and a gold coin. One of the drawers is pulled out and a coin is taken out. It turns out to be a silver coin. What is the probability of drawing a gold coin, if one of the other two drawers is pulled out next and one of the coins in it is drawn at random ?
(a) 37.5%
(b) 50%
(c) 62.5%
(d) 75%
2085: The Dul Hasti Power Station is based on which one of the following rivers?
(a) Chenab
(b) Beas
(c) Ravi
(d) Sutlej