A ball of mass 0.5kg moving at 10m/s collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

• A. 0.2m/s
• B. 0.5m/s
• C. 5.0m/s
• D. 5.5m/s

Two capacitors if capacitance 0.4\(\mu F\) and 0.5\(\mu F\) are connected in parallel and charged to a p.d. of 50V, Determine the total charge acquired

• A. 45\(\mu C\)
• B. 25\(\mu C\)
• C. 20\(\mu C\)
• D. 10\(\mu C\)

A newly charged 12V accumulator can easily start a car whereas eight new dry cells in series with a effective e.m.f. of 12V cannot start the same car because

• A. The current capacity is high
• B. The current capacity is low
• C. it cannot be re-charged
• D. it cannot easily be connected to a car

in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?

• A. 30V
• B. 40V
• C. 50V
• D. 70V

In a projection lantern of focal length f, the object distance u, is such that

• A. u > 2f > f
• B. u< f< 2f
• C. u = f< 2f
• D. f< u< 2f

(a) What is a geostationary satellite?

(b) Name two types of Lasers.

A transformer which can produce 8V from a 240v a.c. supply, has an efficiency of 80%. If the current in the secondary coil is 15A, calculate the current in the primary coil.

• A. 0.625A
• B. 1.600A
• C. 2.500A
• D. 6.250A

The total energy required to send a unit positive charge round a complete electrical circuit is the

• A. kinetic energy
• B. potential difference
• C. electromotive force
• D. electrical energy

Calculate the specific latent heat of vaporization of steam of 1.13 x 106J of heat energy is required to convert 15kg of steam to water.

• A. 7.53 x 105 Jkg−1
• B. 7.53 x 10-2Jkg−1
• C. 7.53×104Jkg−1
• D. 7.53 x 10-3Jkg−1

The distance between the successive crests of a wave travelling at 20ms^-1 is 25cm. Calculate the frequency of the wave

• A. 0.8Hz
• B. 5.0Hz
• C. 50.0Hz
• D. 80.0hz