To electrolyse solid lead bromide it must first be heated so that:

Three lights flash at intervals of 2, 6 and 14 seconds respectively. They are started together. How soon after will they next flash together again?

The area of the trapezium ABCD above is

Leaves are thin and flat:

0.0039 × 10^-2 in scientific notation is

Seeds are dispersed from the parent plant:

The scientific name of an organism is derived from its:

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

Which of the following methods of fishing is MOST damaging to the eco-system?

A ripple travels over the surface of some water. Its wavelength is 2 m, its amplitude is 0.1 m and its frequency is 0.5 Hz.The speed of the ripple is:

January 1, 1999 a trader bought 100 articles at $5.00 each. During the month 70 Of the articles were sold at $8.00 each and the remainder were sold on January at the market value of $3.00 each. What was the gross for the month?

The number of carbon atoms in the alcohol, pentanol, is:

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

The energy used in thermal decomposition is:

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

If p * q = pq² , then 2 * 3 =

A student observed a plant cell through a microscope and made an accurate drawing of the cell. If her drawing was 80 mm in diameter and had a magnification of ×2000, what was the real diameter of the cell?

What is the simple interest earned on $10 000 invested for 3 months at a rate of 5% per annum?

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

Hydrochloric acid forms salts called: