A particle of charge 5C moves perpendicularly to a magnetic Held of magnitude C.01 T. If the velocity of the charge is 1.5ms^-2, calculate the magnitude of the force exerted on the particle

• A. 0.050 N
• B. 0.075N
• C. 0.0300N
• D. 3.300N

A rectangular block of wood floats in water with two-thirds of its volume immersed. When placed in another liquid, it floats with half of its volume immersed. Calculate the relative density of the liquid

• A. 1.43
• B. 1.33
• C. 1.00
• D. 0.75

The vacuum in a thermoflask reduces heat loss resulting from

• A. radiation only
• B. conduction and convection only
• C. radiation and convection only
• D. conduction only

Calculate the quantity of heat released when 100g of steam at 100°C condenses to water(Take the specific latent heat of vaporization of water as 2.3x \(10^6Jkg^{-1}\))

• A. 2.3x\(10^{1}J\)
• B. 2.3x\(10^{2}J\)
• C. 2.3x\(10^{4}J\)
• D. 2.3x\(10^{5}J\)

The difference between sound waves and light waves is that sound waves

• A. are transverse while light waves are longitudinal
• B. require a medium to travel while light waves does not
• C. can be diffracted but light waves cannot
• D. cannot be reflected but light waves can

The knowledge of surface tension is applied in the following areas except in

• A. manufacturing of rain coats
• B. production of palm oil
• C. floating of a needle on water
• D. washing of plates with soapy water

In a nuclear reactor, electricity can be generated through the following processes. Arrange the processes in the correct order. i. The steam is used to drive turbines. ii. The heat energy released is removed by passing water through the reactor. iii. The turbines in turn generate electricity. iv. The water then passes through some form of heat exchanger to produce steam

• A. ii, iv, i and iii
• B. i, ii, iii and iv
• C. iii, i, iv and ii
• D. iv, i, iii and ii

If a freely suspended object is pulled to one side and released, it oscillates about the point of suspension because the

• A. acceleration is directly proportional to the displacement
• B. motion is directed away from the equilibrium point
• C. acceleration is directly proportional to the square of the displacement
• D. velocity is minimum at the equilibrium ponit

(a) What is surface tension?

(b) State two methods by which the surface tension of a liquid can be reduced.

The heat capacity of a substance is the energy

• A. required to raise the temperature of a unit mass of the substance by one degree.
• B. required to raise the temperature of the substance by one degree
• C. absorbed by the substance at constant temperature
• D. lost by a unit mass of the substance.