Which of the following substances contains the elements carbon, hydrogen, oxygen and nitrogen?
Ⅰ DNA
Ⅱ carbohydrates
Ⅲ lipids
Ⅳ proteins

All of these materials are used in a blast furnace EXCEPT for:

Which of the following statements about photosynthesis is NOT true?

The interest rate on investments in a bank decreased from 8 ¹/₂ per cent per annum to 6 per cent per annum. The difference in annual interest on a deposit of $2 000 is

A __________ is a device that is externally connected to and under the control of the central processing unit.

A __________ is a sub-division of a track that stores data on a disk.

Two resistors, one of 4 Ω and one of 6 Ω, are connected in parallel.Their combined resistance is:

Large-scale applications sometimes refer to a graphic tablet as a __________.

Dividing the mass in grams by the mass of 1 mole in grams gives:

The units we use for heat given out by a reaction are:

This question refers to the triangle PQR in which angle QPR = 90°, PR = 12 cm and PQ = 5 cm.

The length of QR, in cm, is

For which of the following purposes is the information collected in a census normally used?

1. To determine the rate of population growth
2. To predict the needs of the society and plan how to satisfy them
3. To estimate the number of government supporters in the country

The density of seawater is:

In the circle above, the circumference is 10 cm. The length of the arc AB, in centimetres, is

An insoluble metal oxide can be described as:

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

The Item refer to the information below The following scores were obtained by eleven footballers in a goal-shoot competition:

The modal score was

Which of the following social issues are associated with the use of illegal drugs by adolescents?

1. Criminal activity
2. Indiscipline
3. Early marriage
4. Poverty

Urea is made from surplus proteins in:

One Faraday represents: