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846. In vulcanisation, natural rubber is heated with
A. Carbon
B. Sulphur
C. Silicon
D. Phosphorus
Explanation:
847. Which one of the following metals has the highest density ?
A. Gold
B. Iron
C. Platinum
D. Lead
Explanation:
848. Why does radio perception improve slightly during the night ?
A. Unlike the day time, only a few radio stations broadcast during the night.
B. The outside noise is reduced very much at night.
C. Sunlight affects radio broadcast to some extent.
D. The magnetic field of the earth acts with reduced intensity during the night thereby reducing its impact on broadcasts.
Explanation:
849. Small drops of a liquid are spherical in shape because
A. the earth attracts all the particles of the drop equally.
B. for a given volume, the surface area of a sphere is maximum.
C. the surface energy is maximum for the spherical shape.
D. the surface energy is minimum for the spherical shape.
Explanation:
850. In a pond, a boat is moving. At one place in the middle, the water begins to enter the boat through a hole. At the point, the boat is ready to sink, the water level will
A. decrease
B. increases
C. remain the same
D. depend on the structure of the boat
Explanation:
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