AIPMT 2009 Preliminary Mock Test

The driver of a car travelling with speed $30\text{m/sec}$ towards a hill sounds a horn of frequency $600\text{Hz}$. If the velocity of sound in air is $330\text{m/s}$, the frequency of reflected sound as heard by driver is:

A wire of resistance $12\Omega /\text{m}$ is bent to form a complete circle of radius $10\text{cm}$. The resistance between its two diametrically opposite points, $A$ and $B$, is:

A rectangular, a square, a circular and an elliptical loop, all in the $(x-y)$ plane, are moving out of a uniform magnetic field with a constant velocity, $\vec{v}=v\hat{i}$. The magnetic field is directed along the negative $z$ axis. The induced emf will not remain constant for:

A galvanometer having a coil resistance of $60\Omega$ shows full scale deflection when a current of $1.0\text{A}$ passes through it. It can be converted into an ammeter to read currents up to $5.0\text{A}$ by:

Power dissipated in an LCR series circuit connected to an a.c source of emf $ϵ$ is: