A detector close to a sample of radioactive material records 76 counts per second (cps). Precisely 2 days later the count rate has fallen to 22 cps.The count rate due to background radiation, taken immediately before and after the experiment, averaged 4 cps. The half-life of the material is:

The equation of the line which passes through the point (0 , -3) and has a gradient of ¹/₂ is

The equation of the line which passes through the point (0, 2) and has a gradient of ¹/₃ is

Devices that capture data directly from a source document include all of the following items EXCEPT __________.

Plant stems grow towards a light source.This is an example of:

The halogen, bromine, at room temperature is a:

Which of the following entries should be used to post Sales return?

The area of the trapezium ABCD above is

The range of values of v when 5 - v ≤ 2v - 1 is

Which of the following types of households in the Caribbean is MOST closely associated with ancestors who came from India?

Atherosclerosis is a process in which:

The two common varieties of chlorine atoms are called:

Simple sugars are called monosaccharides because:

The site of reabsorption of MOST of the water from the filtrate.

Which of the following would MOST likely result from women working outside the home?

1. Improvement in the standard of living
2. Higher self-esteem for women
3. Fewer educational opportunities for men
4. Fall in family values

All of these elements form allotropes EXCEPT for:

The standard atom used for mass calculations is:

More collisions between particles are likely to happen if a solution is made:

How many lines of symmetry does this shape have?

Which one of the following statements about light passing down an optical glass fibre is NOT true?