AIEEE 2009 PYQ Mock Test

A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature $\theta$ along the length $x$ of the bar from its hot end is best described by which of the following figure:

A transparent solid cylindrical rod has a refractive index of $\frac{2}{\sqrt{3}}$. It is surrounded by air. A light ray is incident at the mid point of one end of the rod. The incident angle $\theta$ for which the light ray grazes along the wall of the rod is:

Three sound waves of equal amplitudes have frequencies $(\nu -1)$, $\nu$, $(\nu +1)$. They superpose to give beats. The number of beats produced per second will be:

The height at which the acceleration due to gravity becomes $g/9$ (where $g=$ the acceleration due to gravity on the surface of the earth) in terms of $R$, the radius of the earth is:

Two wires are made of the same material and have the same volume. However wire 1 has cross-sectional area $A$ and wire-2 has cross-sectional area $3A$. If the length of wire 1 increases by $\Delta x$ on applying force $F$, how much force is needed to stretch wire 2 by the same amount?