(a) State two deductions that can be made from a displacement-time graph.

(b) If the distance beween two equal masses is doubled and their individual masses are also doubled, what would happen to the force between them? Support your answer quantitatively.

(c) State two factors that affect the maximum height attained by a bullet fired from a gun.

(d) State two practical examples of mechanical resonance. A body is released from rest at the top of a plane inclined at 30° to the horizontal and 4.0 m high. If the coefficient of friction between the body and the plane is 0.3, calculate the time the body takes to reach the bottom of the plane.

The main difference between echo and reverberation is that

• A. reverberation is reflected sound while echo is refracted sound
• B. the time interval between incident sound and reflecte sound is shorter for reverberation
• C. the amplitude of an echo is greater
• D. reverberation is from acoustic speakers while echo comes from clifts

Which of the following is not a factor affecting the movement of ocean currents?

• A. the planetary winds
• B. differences in temperatures
• C. shape of the land mass
• D. differences in the rate of evaporation

The market for apples is represented by the following demand and supply functions:

Qd = 30 - p;

Qs = 15 + 2p.

(a) Prepare a demand and supply schedule for the market, given the prices $2.00, $4.00 and $7.00.

(b) (i) Determine the equilibrium price and equilibrium quantity of apples in the market.

(ii) If the price of apple is fixed at $3.00, what will be the excess demand or excess supply.

(c) Suppose the demand function changed to Qd = 40 - p. Using the prices in (a) above:

(i) prepare a new demand schedule;

(ii) does it represent an increase or a decrease in demand?

(iii) explain your answer in (c) (ii) above.

Rural settlements are important to urban centres because they provide?

• A. road
• B. transport
• C. labour
• D. capital

State three methods of polirizing an unpolarized light

What ecological condition favours the breeding of black flies?

• A. Fresh water habitat
• B. Water in ponds and swamp
• C. Water in small containers
• D. Fast flowing streams

A person has 4 coins each of different denomination, what is the number of different sums of money the person can form (using one or more coins at a time)?

• (a) 16
• (b) 15
• (c) 14
• (d) 13

A system whereby there is only one legislative chamber parliament is referred to as

• A. unicameral legislature
• B. confederal legislature
• C. monarchical legislature
• D. bi-cameral legislature

Which of the following pyramids gives the most accurate picture of the relationships between at the various trophic levels in a food chain? A pyramid of

• A. numbers
• B. energy
• C. biomass
• D. size