Physics- TIMSS Grade 8 (1999)

Most of the chemical energy released when gasoline burns in a car engine is not used to move the car, but is changed into

• Electricity

• Heat

• Magnetism

• Sound

Which object in the table has the greatest density?

• W

• X

• Y

• Z

The walls of a building are to be painted to reflect as much light as possible. What color should they be painted?

• White

• Red

• Black

• Pink

Each of the three magnets has been dipped into the substance below it. Which one of the substances could be coffee?

• A only

• B only

• C only

• A and B only

The sequence of energy changes shown explains which event?

Chemical energy> heat energy> mechanical energy (with wasted heat)

• A flashlight is on

• A candle burns

• Gasoline burns to power a car

• Electric current runs a refrigerator

On a warm sunny day, you will feel cooler wearing light coloured clothes because they

• Reflect more radiation

• Prevent sweating

• Are not as heavy as dark clothes

• Let more air in

People get energy from the food they eat. Where does the energy stored in food come from?

• Fertiliser

• The Sun

• Vitamins

• The soil

A student put 100 mL of water in each of the open containers and let them stand in the sun for one day. Which container would probably lose the most water to evaporation?

• A

• B

• C

• D

The drawings show a rocket being launched from Earth and then returning. In which of the positions does gravity act on the rocket?

• 3 only

• 1 and 2 only

• 2 and 3 only

• 1, 2 and 3

Which picture shows the best way for the man to balance a ten-liter bucket of water and a five-liter bucket of water?

• A

• B

• C

• D