Science and energy

Heat transfer that is shown in the picture is called ....

• radiation

• conduction

• convection

• friction

The example of the heat transfer “conduction” are....

• A pot sitting on a hot burner.

• Boiling a water in the pot

• Sunbathing to get the skin tan.

• An iron is used to iron your clothes

The following object that needs the energy from the sun is shown....

• rice cooker

• light bulb

• iron

• green plants

Activities in the table above that needs more energy are shown....

• Watching a movie

• Jogging in the morning

• Playing basketball

• Listening to music

The correct energy transformation in the activity above is ....

• kinetic energy to electrical energy

• electrical energy to magnetic energy

• gravitational potential energy to electric energy

• elastic potential energy to kinetic energy

The correct meaning of energy is ....

• an amount of vibration in one second

• the amount of force exerted per area

• an ability to do work

• a push or pull upon an object

Solar energy is an example of alternative energy. Which of the following statements shows the disadvantage of solar energy?

• It can cause air pollution

• It can produce a great amount of energy and freely provided by nature.

• It can only be used only when the sunshine/daylight.

• It can cause damage to the water.

The energy transformation result from the picture can be used to ....

• produce electricity

• drying clothes

• produce nuclear energy

• help the process of photosynthesis