Physics Test with Answers - Set 10 - ObjectiveBooks

# G.K. Practice Test: Question Set - 10

1. The ozone layer of the earth is useful for living beings because
(A) It serves as the source of oxygen by decomposing air
(B) It maintains the nitrogen cycle of the earth
(C) It maintains the temperature of the earth
(D) It protects them from excessive ultraviolet rays of the sun

2. When the Sun reaches its maximum distance from the equator, it is known as
(A) Solstice
(B) Eclipse
(C) Equinox
(D) Sidereal Day

3. Imaginary lines drawn on a global map from pole to pole and from the perpendicular to the equator are called
(A) Contours
(B) Isobars
(C) Meridians
(D) Steppes

4. Gravity setting chambers are used in industries to remove
(A) SOX
(B) NOX
(C) Suspended particulate matter
(D) CO

5. A pond may be referred to as
(A) An artificial ecosystem
(B) A natural ecosystem
(C) A biome
(D) A community of plants and animals

6. Fathometer is used to measure
(A) Earthquakes
(B) Rainfall
(C) Ocean depth
(D) Sound intensity

7. At the equator, the duration of a day is
(A) 10 hrs
(B) 12 hrs
(C) 14 hrs
(D) 16 hrs

8. The term “Refraction of light” means
(A) Bending of light rays when they enter from one medium to another medium
(B) Bending of light round the corners of obstacles and apertures
(C) Coming back of light from a bright smooth surface
(D) None of these

9. Fish plates in Railway tracks are used to
(A) Connect two rails
(B) Join two coaches
(C) Guide the wheels
(D) Avoid fishes on the track

10. On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that
(A) The clear sky allows radiant energy to escape readily from the earth
(B) On a cloudy night the clouds are warm and therefore retard the cooling
(C) The clear sky allows the cold of outer space to reach the earth
(D) Current of air carry the heat away from the earth on a clear night

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