Assertion: The length of the day is slowly increasing.
Reason: The dominant effect causing a slowdown in the rotation of the earth is the gravitational pull of other planets in the solar system.

The mass of planet is 1/64 of the earth but the gravitational pull is 1/9 of the earth. It is due to this reason

Assertion : If earth were to shrink length of the day would increase. Reason : Smaller object would take more time to complete one rotation around its axis.

Assertion: There is no effect of rotation of a earth on acceleration due to gravity at poles. Reason : Rotation of earth is about polar axis.

Assertion : If the ice on the polar caps of the earth melts, then length of day will increase. Reason : Moment of inertia of the earth increases, as ice on polar caps melts.

Venus rotates from East to West. Which other planet in the solar system rotates from East to West.

Assertion : A satellite can not be set on a stable orbit in a planet not passing through the earth's centre. Reason: For the orbital motion of satellite, the centripetal force is provided by gravitational pull of earth on satellite.