AIIMS UG 2013 Mock Test

In YDSE, slits are $2\text{mm}$ apart and $D=2\text{m}$. Two wavelengths ${\lambda }_1=12000\text{A˚}$ and ${\lambda }_2=10000\text{A˚}$ are used. At what minimum distance from the central fringe will their bright fringes coincide?

A parallel beam of fast moving electrons is incident normally on a narrow slit. If the speed of electrons is increased:

In a n-type semiconductor, which of the following is true?

In a CE amplifier, the transistor used has transconductance $0.03\text{mho}$. If replaced with another having transconductance $0.02\text{mho}$, the voltage gain $G$ becomes:

The output ($X$) of a NAND gate followed by a NOT gate is equivalent to: