Basic Forces in Nature

Which one among the following statements about diastrophism is correct?

In respect of the difference of the gravitational force from electric and magnetic forces, which one of the following statements is true?

It is difficult to cut 'things with a blunt knife' because:

Contact force is another name for:

Gravitational force is maximum at which place?

A body is acted upon by two unequal forces in opposite directions, but not in one line. The effect is that the body will have:

Which one of the following is not a contact force?

In a vacuum, a five-rupee coin, a feather of a sparrow bird and a mango are dropped simultaneously from the same height. The time taken by them to reach the bottom is ${\mathrm{t}}_1, {\mathrm{t}}_2$ and ${\mathrm{t}}_3$ respectively. In this situation, we will observe that:

Mass of a particular amount of substance:

1. Is the amount of matter present in it.

2. Does not vary from place to place.

3. Changes with change in gravitational force.

Select the correct answer using the code given below: