Question

Gravity is shown by
A. earth only
B. earth and moon
C. earth and some selected planets
D. all objects in the universe

Answer 1

Hint:In order to solve this question, we should know that In our physical universe all there is matter and energy distributed all over the space and the basic force of attraction between all bodies is governed by Newton’s law of gravitation and tis force is known as gravitational force, here we will discuss about gravity and its nature and presence in all over the universe.

Complete answer:
Newton’ gave the gravitational force of attraction concept that every object attracted towards each other in the universe and due to this attraction every object produces an acceleration which is the cause of falling of a body towards the surface of another body and thus acceleration is known as acceleration due to gravity.

But, it’s unfair to say that gravity is restricted to some planet and earth but gravity is universal; it's produced by every object in the universe. Every object has some magnitude of gravity which mainly depends upon the mass of the object so, gravity is possessed by all objects in the universe. For earth it has a fixed value on its surface as $g = 9.8\,m{s^{ - 2}}$.

Hence, the correct option is D.

Note: It should be remembered that, It was Einstein who gave the basic reason for gravity which was that the whole space-time fabric of the universe becomes curved when there is some mass and due to this curvature other objects tend to attract or fall towards the massive body. When the value of gravity is so strong in very little space it creates the black hole formation from where even light can’t come back due to strong gravity.