VII SCIENCE QUICK REVISION

Find the speed for the return journey shown on this distance time graph.

• 20 km/h

• 2 km/h

• 40 km/h

• 10 km/h

A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s average acceleration?

• 8 m/s

• 0.25 m/s

• 8 m/s²

• 0.25 m/s²

When metal burns in oxygen it produces colorful flame. Which metal has been burned with oxygen in the image shown?

• Cu

• Ba

• K

• Na

If an object in air is viewed from beneath the surface of water below, where does the object appear to be?

• The object appears above its true position.

• The object appears exactly at its true position.

• The object appears below its true position.

• The object cannot be viewed from beneath the water's surface.

Which of the following organism provides energy for more than one organism in the food web?

• Mouse

• Hawk

• Snake

• Lizard

If all light waves are reflected off a medium, then what color will be observed?

• Black

• White

• Yellow

• Pink

What is the correct formula for dinitrogen tetraoxide?

• N₃O₃

• (N₂)₂(O₄)₃

• N₂O₄

• N₄O₂

What is the chemical nature of rust?

• copper oxide

• hydrated iron oxide

• iron oxide

• hydrated copper oxide

Small pieces of calcium metal are added to some cold water. At the end of the reaction, the temperature has gone up to 47°C. Which word describes this reaction?

• Exothermic

• Endothermic

• Colourless

• Fizzes

What is the name of the compound CCl₄?

• carbon carbon tetraiodide

• carbon tetrachloride

• water

• carbon tetraiodide