All of the following can affect the size of a population EXCEPT for:

To remove limescale from a tap you need:

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

The nucleus of a carbon atom has six protons and eight neutrons.Which one of the following describes it?

A contractor completed five-ninths of a job before a second contractor completed an additional one-third. What fraction of the job is left undone?

The gross profit of a firm is $3,600, bad debts $100, rent paid $120, rent prepaid $20, general expenses $80 and discount received $110. The net profit is

Automated directory assistance services utilize __________ technology for accepting user input.

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

75 g of freshly dug soil was placed in an oven at 105 ℃ for 24 hours. It was allowed to cool, then reweighed. If the final mass of the dry soil was 66 g, what was the % water content of the original soil sample?

When potassium burns in chlorine, the material that is oxidised is called:

Which one of the following statements about an ammeter is NOT true?

In the figure above, the shaded portion represents

Which of the following is the Highest Common Factor of 18, 24 and 36?

__________ are used in specialized fields such as engineering and drafting for outputting large-format drawings.

When two solutions are mixed and give a solid product we call it:

The average of a set of numbers reduces from 14 to 11 when the number 35 is removed. How many numbers were in the original set?

The point where two neurones connect is called:

One example of an emulsifying agent is:

The mean of ten numbers is 58. If one of the numbers is 40, what is the mean of the other nine?

1 mole of gas occupies 24 litres at room temperature and pressure, so the number of moles in
72 litres is: