Basic Science and Technology

Some Grade 6 learners carried out an investigation to find out how quickly ice would melt in different locations around their school. They left a block of ice to melt. Every two minutes they took the block of ice and measured its mass. Above is their table of results.

Arrange the locations starting from the hottest to the coldest.

• B, A, D and C

• C, A, D and B

• D, A, B and C

• A, B, D and C

Which of the following is a reversible change?

• Frying egg

• baking cake

• freezing orange juice to make ice lollies

• browning onions

In the separation technique illustrated below, A and B represent _________ and ________.

• Residue and Filtrate

• Water and Oxygen

• Carbon and Sulphur

• Sand and Sugar

A mixture of sand and iron fillings can be separated using _____________.

• Magnetic separation

• Decantation

• Filtration

• Chromatography

The path along which each planet moves round the sun is called its ________.

• Circle

• Sphere

• Path

• Orbit

Some Grade 6 learners carried out an investigation to find out how much sugar would dissolve in 300ml of water at different temperatures. Above is their graph of results.

How many grams of sugar will dissolve when the temperature is 50⁰C?

• 330g

• 360g

• 400g

• 420g

The separation technique above is used to separate two solids of different sizes. What is it called?

• Distillation

• Decantation

• Sieving

• Chromatography

The process whereby vapour changes to liquid is called ____________.

• Respiration

• Evaporation

• Condensation

• Melting

Which of the changes is illustrated by the pictures above?

• Reversible change

• Irreversible change

• Static change

• Unstable change

Which planet is the closest to the sun?

• Jupiter

• Venus

• Neptune

• Mercury