Data Entry - Physics

When $n-p-n$ transistor is used as an amplifier:

Two thin lenses of focal lengths $f_1$ and $f_2$ are in contact and coaxial. The power of the combination is

$A$ conductor of resistance $3 \Omega$ is stretched uniformly until its length is doubled. The wire is now bent in the form of an equilateral triangle. The effective resistance between the ends of any side of the triangle in ohms is

Which of the following organisms possesses a cell wall made of peptidoglycan?

Thorn of $Bougainvillea$ and tendril of $Cucurbita$ are examples of