Physics Past Questions and Answers

A mass of gas at 7<sup style='font-size: smaller;'>o</sup>C and 70cm of mercury has a volume of 1200cm<sup style='font-size: smaller;'>3</sup>. Determine its volume at 27<sup style='font-size: smaller;'>o</sup>C and pressure of 75cm of mercury.

An electric heater is used to melt a block of ice of mass 1.5kg. If the heater is powered by a 12V battery and a current of 20A flows through the coil, calculate the time taken to melt the block of ice at 0<sup style='font-size: smaller;'>o</sup>C. [specific latent heat of fusion of ice = 336 x 10<sup style='font-size: smaller;'>3</sup>Jkg<sup style='font-size: smaller;'>-1</sup>]

From the kinetic theory of gases, temperature is a

A vibrator of frequency 60Hz is used in generating transverse stationary waves in a long thin wire, If the average distance between successive nodes on the wire is 45cm, find the speed of the transverse waves in the wire.

When the tension in a sonometer wire is doubled, the ratio of the new frequency to the initial frequency is