Physics Past Questions and Answers

Two resistors \(12 \Omega\) and \(8 \Omega\) are connected in parallel, if the power developecin \(12 \%\), resistor is \(6 w\), determine the power developed in \(3.32\) resistor.

How long will a 60 wart element take to heat water of mass \(9.5 kg\) at \(20^{\circ} C\) to \(90^{\circ} C\). Neglect heat loss (S.H. C. of water \(=4200 jkg ^{-1} K ^{-1}\) )

The critical angle of glass is \(42^{\circ}\), the approxiffate refractive tho dex of this glass is

Second harmonic motion of a string
\(1.5 m\) long fixed at both ends \(80 Hz\).
The speed of transverse wave in the string is

The echo produced when a motion is fire from a ship some distance from cliff is heard 2 secontigalculate the distance of the ship (if the velocity of Sound in air \(=330 m / s\) )