Secondary sewage treatment is mainly a

When a large bubble rises from the bottom of a lake to the surface, its radius doubles. If atmospheric pressure is equal to that of a column of water of height $H$, then the depth of the lake is:

The radius of gyration of a uniform thin rod of length $L$ about an axis passing normally through its centre of mass is:

If the lines represented by the equation $2x^2 - pxy + 2y^2 = 0$ are real,then the value of $p$ lies in the interval:

Which of the following cereals is a pseudo-cereal?

Platinum crystallizes in a face-centered cubic $(FCC)$ crystal with a unit cell length $a$. The distance between nearest neighbors is