Transistors
20 previous year questions.
High-Yield Trend
Chapter Questions 20 MCQs
A Carnot engine has an efficiency of 50%. If the temperature of the sink is reduced by , its efficiency increases by 30%. The temperature of the source will be:
A particle of mass originally at rest is subjected to a force whose direction is constant but magnitude varies with time according to the relation
where and are constants. The force acts only for the time interval . The velocity of the particle after time is:
In the circuit shown in the figure, the total charge is and the voltage across capacitor is . Then the charge on capacitor is:
A square frame of side cm and a long straight wire carrying current are in the plane of the paper. Starting from close to the wire, the frame moves towards the right with a constant speed of m/s (see figure). The induced EMF at the time the left arm of the frame is at cm from the wire is:
Equipotential surfaces are shown in the figure. The electric field strength will be:
\includegraphics[width=0.5\linewidth]{31.png}