Lenz's law of electromagnetic induction states that

• A. e.m.f. is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit.
• B. the induced current in a conductor is in such a direction as to oppose the change producing it
• C. the magnitude of the induced e.m.f. in a circuit is proportional to the rate of change of the number of lines of force linking the circuit
• D. a force is exerted on a current-carrying conductor in a magnetic Held

The symptoms of coffee leaf rust are

• A. leaf spots, loss of vigour and death of the leaves
• B. wilting and death of plant
• C. damping off and etiolation
• D. leaf spots and damping off

Pasture crops are best used in preparing hay

• A. when they are two weeks old
• B. just before flowering
• C. just after seed maturation
• D. after they have started to dry up

A farm tool used for harvesting heads of rice is the

• A. shear
• B. secateur
• C. sickle
• D. rake

The major problem encountered in international trade is that of

• A. distance
• B. differences in culture
• C. politics
• D. differences in currency

The main lesson to be learnt from Elijah's victory at Mount Carmel is

• A. God empowers his prophets
• B. the failure of false prophets
• C. God's supremacy over false gods
• D. ability to bring fire from heaven

Calculate the length of an arc of a circle diameter 14 cm, which substends an angle of 90° at the center of the circle

• A. 7π/2 cm
• B. 7π cm
• C. 14π cm
• D. 7π/4 cm

Use the following equations to answer the question below I - Boiled saliva + starch ? X II - Fresh saliva + starch ? Y What substances do X and Y represent?

• A. X = Maltose and Y = Sugar
• B. X = Starch and Y = Maltose
• C. X = Sugar and Y = Starch
• D. X = Maltose and Y = Starch

The secretion of reproductive and growth hormone in animals is controlled by the

• A. prostate gland
• B. pituitary gland
• C. adrenal gland
• D. ovary

The time rate of change of momentum is

• A. impulse
• B. force
• C. power
• D. pressure