When zinc sulphide is heated in air the gas produced is:

A man bought a shirt at a sale. He saves $30 on the normal price when he paid $120 for the shirt. What was the percentage discount on the shirt?

The main metal in tin cans used to preserve food is:

The major plant nutrients written as NPK refer to phosphorus, nitrogen and:

The halogens are found in:

The following are all features of insect-pollinated flowers EXCEPT for:

The sharp-tasting compound in vinegar is:

The method by which certain uranium and plutonium nuclei can release energy in a reactor is known as:

Which of the following sets has an infinite number of members?

Three lights flash at intervals of 4, 6 and 10 seconds respectively. They are started together. How soon after will they next flash together again?

The correct pathway of water through a plant is:

The shaded area in the Venn diagram above represents

The animals shown in the diagram were identified using a dichotomous key based on the visible characteristics listed below:
Ⅰ body shape
Ⅱ number of legs
Ⅲ number of wings
Ⅳ number of eyes
Ⅴ number of antennae
Which characteristics could be used to divide the animals into two groups?

Which one of the following lists only differences between aerobic respiration and anaerobic respiration?

The group of elements whose molecules and atoms are the same is called:

Crossing two brown mice produced an offspring with a black coat.Which of the following statements MUST be correct?
Ⅰ Brown coat is dominant to black.
Ⅱ The brown mice were heterozygous for coat colour.
Ⅲ The black mouse was homozygous for coat colour.
Ⅳ Crossing a black mouse with another black mouse could produce a brown offspring.

Quantity of electricity in coulombs = current in amps multiplied by:

The number 0.0417 in standard form is

In a water condenser the cooling water enters at:

Instruction: Choose from the four options the word or pair of words which BEST completes the meaning of the sentence.

An attack on someone when that person is most vulnerable may be ............ but is always ............