Question

Choose the correct alternative.
i) Law of gravitation gives the gravitational force between
a) the earth and a point mass only
b) the earth and Sun only
c) any two bodies having some mass
d) two charged bodies only
ii) Satellite revolving around the earth at a height of 400 km above the carth's surface has a
period of about
a) 24 hours
b) 90 minutes c) 2 hours
d) > 24 hours
iii) What happens when a piece of zinc metal is added to copper sulphate solution?
a) Copper sulphide is formed.
b) Colourless solution of zinc sulphate is formed.
c) Copper sulphate solution is not affected at all.
d) Hydrogen sulphide gas is evolved.
iv) If two ice cubes are pressed against each other, they stick together firmly after some time
because
a) temperature of the ice cubes reduces.
b) the melting point of ice reduces to below 0°C due to the pressure applied.
c) temperature around the ice cubes reduces.
d) the melting point of ice becomes 0°C due to pressure.
does not occur during the formation of rainbow.
b) Dispersion
a) Refraction
d) Induction
c) Reflection​

Answer 1

Explanation:

law of gravity give the gravitational force between the earth and point mass only the earth and sun only