Physics Past Questions and Answers

The sketched graph above illustrates the heating curve of a 0.02kg of water. Determine the approximate value of the specific latent heat of vapourization of water

A 2.25 x 10\(^6\) J kg\(^{-1}\)
B 4.17 x 10\(^3\) J kg\(^{-1}\)
C 2.00 x 10\(^3\) J kg\(^{-1}\)
D 1.00 x 10\(^3\) J kg\(^{-1}\)

Question 1987:

In the hydraulic press, the force F applied is related to the diameter d of the cylinder by

A F \(\alpha\) d\(^2\)
B F \(\alpha\) d
C F \(\alpha\) d\(^{-1}\)
D F \(\alpha\) d\(^{-2}\)

Question 1988:

In an electric circuit, an inductor of inductance 0.5 H and resistance 50\(\Omega\) is connected to an alternating current source of frequency 60 Hz. Calculate the impedance of the circuit.

A 50.0\(\Omega\)
B 450.5 \(\Omega\)
C 195.0 \(\Omega\)
D 1950.1 \(\Omega\)

Question 1989:

Which of the following statements correctly explains why a total solar eclipse would be seen by people on only a small portion of the earth's surface? The

A Moon is larger in diameter than the earth
B Eath is larger in diameter than the sun
C Earth revolves around the sun
D Earth is larger in diameter than the moon.

Question 1990:

Water waves have a wavelength of 3.6cm and speed of 18cms\(^{-1 }\) in deep water. If the waves enter shallow water with wavelength of 2.0cm, calculate the speed of the waves in the shallow water.

A 0.4cms\(^{-1}\)
B 2.5cms\(^{-1}\)
C 10.0cms\(^{-1}\)
D 10.8cms\(^{-1}\)