Physics Past Questions and Answers

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductors are 30V and 40V respectively. <br/><br/>What is the voltage across the capacitor?

A 30V
B 40V
C 50V
D 70V

Question 2262:

If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?<br/><br/>[e = 1.6 x 10\(^{-19}\)J, h = 6.63 x 10-\(^{34}\)Js]

A 6630.0V
B 663.0V
C 66.3V
D 6.6V

Question 2263:

Which of the following is not correct about the molecules of a substance in a gaseous state. They?

A Are in a constant state of motion
B Have different speeds
C Have a temperature which is measured by the average kinetic energy
D The collision between the gases is perfectly inelastic

Question 2264:

A given mass of gas has a pressure of 80 Nm\(^{-2}\) at a temperature of 47 C. If the temperature is reduced to 27 C with volume remaining constant, the new pressure is?

A 46.0 Nm\(^{-2}\)
B 75.0 Nm\(^{-2}\)
C 80.0 Nm\(^{-2}\)
D 85.3 Nm\(^{-2}\)

Question 2265:

0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg\(^{1}\) Cº. Calculate the specific latent heat of fusion of ice.

A 9.0kjkg\(^{-1}\)
B 84.0kjkg\(^{-1}\)
C 134.0kjkg\(^{-1}\)
D 168.0kjkg\(^{-1}\)