The electrochemical equivalent of a metal is $x \ g \ C^{-1}$. The equivalent weight of the metal is:

The angle between the curves $y = \sin x$ and $y = \cos x$ is

Three students $A, B$,and $C$ are given a mathematics problem. The probabilities of them solving the problem are $1/2, 1/3$,and $1/4$ respectively. What is the probability that the problem is solved?

The period of $\sin ^4 x + \cos ^4 x$ is

The length of the tangent drawn to the circle $x^2+y^2-2x+4y-11=0$ from the point $(1,3)$ is:

An organ pipe $P_1$ closed at one end is vibrating in its first overtone. Another pipe $P_2$ open at both ends is vibrating in its third overtone. They are in resonance with a given tuning fork. The ratio of the length of $P_1$ to that of $P_2$ is: