81: Which one of the following conditions is most relevant for the presence of life on Mars ?
(a) Atmospheric composition
(b) Thermal conditions
(c) Occurrence of ice caps and frozen water
(d) Occurrence of ozone
82: A wheel that has 6 cogs is meshed with a larger wheel of 14 cogs. When the smaller wheel has made 21 revolutions, the number of revolutions made by the larger wheel will be:
(a) 12
(b) 49
(c) 9
(d) 4
83: With reference to the wetlands of India, consider the following statements :
1. The country's total geographical area under the category of wetlands is recorded more in Gujarat as compared to other States.
2. In India, the total geographical area of coastal wetlands is larger than that of inland wetlands.
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
84: How many numbers from 0 to 999 are not divisible by either 5 or 7 ?
(A) 313
(B) 686
(C) 341
(D) 786
85: Who among the following invented Lasers?
(a) Theodore Maiman
(b) William Morton
(c) Francis Crick
(d) Denis Papin