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?

What unit measurement is used to express the speed of memory?

The number of litres in 2000 cm³ is:

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

After Lloyd's father died, Lloyd invited his mother to live with his wife, his two sons and himself. The new family structure would be termed.

A circular hole with diameter 6 cm is cut out of a circular piece of card with a diameter of 12 cm. The area of the remaining card, in cm² , is

An alternate form of a gene is called an:

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

The better of the two athletes claim never to have used the dangerous drugs found in his possession.

A molecule of ethene can be described as all of these EXCEPT for:

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?

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

Genetic engineering involves:

The type of bonding that involves loss or gain of electrons is called:

Water reabsorption is controlled by:

Which one of these statements is true for ALL electromagnetic waves?

The non-metal used to make margarine is:

Oxygen is carried around the body by the:

-7 - (-3) =

A __________ is the smallest addressable unit on a disk

In pea plant size, tall is dominant to dwarf.You cannot tell whether a tall plant is homozygous (TT) or heterozygous (Tt).To find its genotype you perform a test cross.This involves: