Physics Past Questions and Answers

A copper rod, 5m long when heated through 20c, expands by 1mm. If a second copper rod, 2.5m long is heated through 5c, by how much will it expand?

A 4mm
B 2mm
C 0.25mm
D 0.12mm

Question 2172:

A safety precaution designed to prolong the life of a lead acid accumulator is

A By topping up the cells with concentrated acid
B The use of naked flame when charging the battery
C Keeping the specific gravity of the electrolyte within specified range
D By connecting wires to the terminals directly when testing the level of charging

Question 2173:

The mass of water vapour in a given volume of air is 0.05g at 20°C, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air.

A 3.33%
B 5.55%
C 33.33%
D 55.55%

Question 2174:

The angular dispersion of a prism depends on

A The index of refraction only
B The angle of incidence as well as the index of refraction
C The angle of incidence only
D The thickness of the prism only

Question 2175:

Which of the following statements are correct of the production and propagation of waves?<br/>I. vibration produces waves<br/>II. waves transmit energy along the medium<br/>III. the medium through which the wave travels does not travel with the wave<br/>IV. waves do not require any medium for transmission

A I & IV only
B II & IV only
C III & IV only
D I, II and III only