Two spheres of masses $m$ and $M$ are situated in air and the gravitational force between them is $F$. The space around the masses is now filled with a liquid of specific gravity $3$. The gravitational force will now be

The existence of a substance in more than one solid modification is known as:

$A$ body of mass $m$ is moving in a circle of radius $r$ with a constant speed $v$. The force on the body is $\frac{mv^2}{r}$ and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle?

Among the following statements,the incorrect one is:

Which of the following salts is used in the bead test for the qualitative analysis of inorganic substances?

Columella auris is a modified