Which of the following animals is not viviparous?

In the circuit shown below,the $AC$ source has voltage $V = 20 \cos(\omega t)$ with $\omega = 2000 \, rad/sec$. The amplitude of the current will be nearest to.....$A$

Which of the following metals releases hydrogen gas upon reaction with cold dilute $HNO_3$?

In the following circuit,the equivalent resistance between $A$ and $B$ is ...... $\Omega$.

If the pairs of straight lines $x^2-2 q x y-y^2=0$ and $x^2-2 p x y-y^2=0$ bisect the angles between each other,then which of the following is correct?

Which of the following compounds is wrongly named?