96: The working principle of a washing machine is
(a) centrifugation
(b) dialysis
(c) reverse osmosis
(d) diffusion
97: The partition of Bengal was undertaken with the view of:
(a) Suppressing the revolt arisen
(b) Satisfying the Hindus and the Muslims
(c) Meeting the demand by the Hindus and the Muslims for a separate State
(d) Dividing the Hindus of the West Bengal and increasing Hindu-Muslim tensions
98: Biofilms are
(a) colour films used by biologists to photograph living organisms
(b) photomicrographs of microorganisms from various habitats
(c) accumulations of microorganisms at surfaces such as those of a rock, a tooth or an oil droplet
(d) photographic films made through fermentation processes of certain industrial microorganisms
99: Consider the following statements:
1. Agricultural soils release nitrogen oxides into environment.
2. Cattle release ammonia into environment.
3. Poultry industry releases reactive nitrogen compounds environment.
Which of the statements given above is/arc correct?
(a) 1 and 3 only
(b) 2 and 3 only
(c) 2 only
(d) 1, 2 and 3
100: What is the approximate percentage of persons above 65 years of age in India's current population?
(a) 14-15%
(b) 8-9%
(c) 11-12%
(d) 5-6%