Question

nails have pointed ends. This results in a
a) decrease in the force exerted on them.
b) a decrease in the effect of the force exerted on them.
c) an increase in the force exerted on them.
d) an increase in the effect of the force exerted on them

The highest grade of coal is known as
a) lignite
b) bitumen
c) anthracite
d) peat

Earthquakes occur when there is a sudden release of stored up energy in the Earth's Which one of these characteristics does a smooth surface has?
a) Less frictional force
b) More frictional force
c) Sometimes less and sometimes more force
d) All of above​

Answer 1

1) d

2) c

3) a

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