A perfect emitter or absorber of radiant energy is a

The bond between silicon and germanium is

In an A.C circuit, the ratio of r.m.s value to peak value of current is

A length of wire has a frequency of 255Hz when stretched by a force of b225N. If the fore increased to 324N, what is the new frequency of vibration

The diagram above show the positions of a cone. The position which can be described as neutral equilibrium is represented as

Two resistors 5Ω and 10Ω are arranged first in series and later in parallel to a 24V source, the ratio of total power dissipated in the series and parallel a...

An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?

In the circuit above, three resistors, 2Ω, 4Ω and 12Ω are connected in parallel and a 12V battery is connected across the combination. The current flowing th...

The diagram above shows two vectors at right angles to each other. The value of the resultant vector is