1. On the clear winter night earth is cooled by
(a) conduction
(b) convection
(c) radiation
(d) condensation
2. Ozone layer in the outer atmosphere helps is in
(a) reflecting radio waves and makes radio communication possible
(b) regulating the temperature of atmosphere
(c) absorbing cosmic ray particles
(d) absorbing UV radiations
3. Humidity refers to
(a) Brackishness of water
(b) latent heat
(c) water vapour in the atmosphere
(d) None of the above
4. Clouds usually form when
(a) air temperature reaches the dew point
(b) evaporation has warmed the surrounding air
(c) relative humidity is 0%
(d) condensation nuclei have been removed from the air
5. Life span of WBC is approximately
(a) 48 hour
(b) 20 hour
(c) 120 days
(d) 100 days
6. Death of tissue or cell inside living body is
(a) neutrophilia
(b) nephrosis
(c) neurosis
(d) neoplesia
7. Which one of the following is a sex linked disease?
(a) Leprosy
(b) Tuberculosis
(c) Colour blindnees
(d) Leukemia
8. Genetic's deals with
(a) Mendel's laws
(b) organic evolution
(c) DNA structure
(d) heredity and variation
9. Presence of gill in the tadpole of frog indicates that
(a) fish evolved from frog like ancestor
(b) frogs will have gills in future
(c) frogs evolved from gilled ancestor
(d) fishes were amphibians in the past
10. The mass number of nucleus is
(a) always less than its atomic number
(b) always more than its atomic number
(c) sometimes more than and sometimes equal to its atomic number
(d) None of the above
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