If the gravitational force of the earth suddenly disappears, which are of the following will be the correct consequence ?

The correct answer is (a).

Mass is a measure of how much matter is in an object, while weight is a measure of the force of gravity on that object. If the gravitational force of the earth suddenly disappeared, the weight of an object would become zero because there would be no force pulling it down. However, the mass of the object would remain the same because the amount of matter in the object would not change.

(b) is incorrect because the mass of an object is not affected by gravity.
(c) is incorrect because both the mass and the weight of an object would not become zero.
(d) is incorrect because the mass of an object would not increase.