The angle between the lines represented by $y^2 \sin^2 \theta - xy \sin^2 \theta + x^2(\cos^2 \theta - 1) = 0$ is

In which of the following compounds is the ratio of the size of the anion to the size of the cation the smallest?

The heart of a fish is:

Which of the following alkali metal ions has the lowest ionic mobility in aqueous solution?

The coil in a moving coil galvanometer experiences a torque proportional to the current passing through it. If a steady current $i$ is passed through it,the steady deflection of the coil is found to be $90^o$. Now,the steady current is switched off and a charge $q$ is suddenly passed through the coil. If the coil has $N$ turns of area $A$ and its moment of inertia is $I$ about the axis of rotation,then the maximum angle through which it deflects upon passing charge $q$ is:

The solution set of the inequality $\log_{10}(x^2 - 2x - 2) \le 0$ is