The general gas law can be written as

• A. PV ÷ T = a constant
• B. PV = a constant
• C. v/t = a constant
• D. p/T = a constant

The time rate of loss of heat by a body is proportional to the

• A. temperature of its surroundings
• B. temperature of the body
• C. difference in temperature between the body and its surroundings
• D. ratio of the temperature of the body to that of its surroundings

If the direction of the curent in a straight wire is reversed, the magnetic field

• A. remains the same
• B. becomes parallel to the wire
• C. ceases to exist
• D. is oppositely directed

When white light passes through a triangular glass prism, there is dispersion because of

• A. diffraction of light
• B. polarisation of light
• C. the difference in speed of the components of light
• D. the interference of light waves in glass

State: (a) the difference between plane polarized light and ordinary light;

(b) two uses of polaroids.

What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100^oC to 80^oC? [the specific latent heat of steam is 2,260,000Jkg^-1, specific heat capacity of water is 4200Jkg^-1K^-1]

• A. 4200J
• B. 2,260,OOOJ
• C. 9,040,000J
• D. 9,380,000J

The pressure of a fixed mass of an ideal gas at 27°C is 3 pa. The gas is heated at a constant volume until its pressure is 5 pa. Determine the new temperature of the gas.

• A. 100^oC
• B. 227^oC
• C. 273^oC
• D. 500^oC

When temperature of a liquid increases, its surface tension

• A. Decreases
• B. Increases
• C. Remain Constant
• D. Increases then decreases

The sound from a source travelled to the bottom of the sea and the echo was heard 4s later. If the speed of sound in sea water is 1500ms^-1 the depth of the sea is

• A. 6000m
• B. 3000m
• C. 1500m
• D. 375m

The most suitable cell used for short interval switches in electric bells is a

• A. lead- acid accumulator
• B. Daniel cell
• C. Leclanche cell
• D. nickel iron accumulator