NEET 2016 Question Paper - Phase-I Code B Q X - Mock Test

An astronomical telescope has objective and eyepiece of focal lengths $40\text{cm}$ and $4\text{cm}$ respectively. To view an object $200\text{cm}$ away from the objective, the lenses must be separated by a distance:

A $npn$ transistor is connected in common emitter configuration in a given amplifier. A load resistance of $800\Omega$ is connected in the collector circuit and the voltage drop across it is $0.8\text{V}$. If the current amplification factor is $0.96$ and the input resistance of the circuit is $192\Omega$, the voltage gain and the power gain of the amplifier will respectively be:

A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then:

A long straight wire of radius $a$ carries a steady current $I$. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields $B$ and $B^{\prime }$, at radial distances $a/2$ and $2a$ respectively, from the axis of the wire is:

Match the corresponding entries of column 1 with column 2. [Where $m$ is the magnification produced by the mirror]Column 1: (A) $m=-2$, (B) $m=-1/2$, (C) $m=+2$, (D) $m=+1/2$ Column 2: (a) Convex mirror, (b) Concave mirror, (c) Real image, (d) Virtual image