CE MC 09

The symbol which does not represent a kind of resistor is

• 
• 
• 
• 

A balanced diet needs very small amounts of

• carbohydrate

• protein

• vitamins

• water

The metal best suited to making water pipes is

• copper

• iron

• sodium

• zinc

When the Sun shines on a tree, a shadow of the tree is formed on the ground. This shadow will be at its shortest at midday in the

• autumn

• spring

• summer

• winter

Pairs of muscles in the human body work

• aggressively

• antagonistically

• cooperatively

• together

The percentage of nitrogen gas in air is about

• 10%

• 20%

• 80%

• 90%

When an aeroplane comes in to land, its speed and height both decrease. The two forms of energy which are decreasing are

• gravitational and kinetic

• gravitational and thermal

• kinetic and elastic

• kinetic and thermal

Root hair cells help the absorption of water and minerals in a plant by

• anchoring the plant

• decreasing the surface area

• increasing the surface area

• photosynthesising

The total number of atoms in one molecule of nitrogen dioxide, NO₂ is

• 1

• 2

• 3

• 4

A substance which will sink when put into water is

• cooking oil

• cork

• ice

• sand