0.045 × 10^-3 in scientific notation is

The correct pathway of water through a plant is:

When rotated through 90° about the origin in a clockwise direction, the image of the point (3, 1) is

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?

In the reactivity series of metals the order is: sodium, calcium, magnesium, aluminium, which means that the most reactive metal is:

Given that a and b are integers, which of the following is not necessarily an integer?

When limestone is heated strongly it changes into:

The second most common gas in the atmosphere is:

All of these are properties of carbon monoxide EXCEPT for:

The air temperature on a particular day is 27 ℃. An air bubble trapped in a tube by a thread of liquid is able to expand freely if it is heated.At what temperature would you expect the volume of the air bubble to double?

Choose the ONE underlined part A, B or C that is inappropriate. If the sentence is acceptable as it stands, choose D.

The biased reporter is concerned not so much with the truth of what he writes, as with its credibility.

When a metal wire carries an electric current, charges flow through it.The moving charges are:

The decimal equivalent of ³/₈ is

The exterior angles and the interior angles of a polygon are equal. How many sides does the polygon have?

The number of electrons in a full electron shell is:

0.0039 × 10^-2 in scientific notation is

The shaded area in the Venn diagram above represents

The triangle ABC above shows the angle of elevation of the top, B, of a tower, BC, from A, to be 30°. AB = 40 m. The length of BC is

In a simple reflex action:

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