List of top Questions asked in COMEDK- 2014

Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of $10$ and the second has a voltage gain of $20$. If the input signal is $0.01\, volt$, what is the output $ac$ signal ?

Three charges $-q, +Q$ and $-q$ are placed at equal distances along a straight line. If the total $P.E.$ of the system is zero, the ratio $ \frac{Q}{q} $ becomes

Plasmodium enters the human body as

Nitrogen shows maximum covalency of $4$ whereas other heavier elements of the group show higher covalency because,