Science Grade 4.4

The sun is the great energy in this world. Most of the energy that we use comes from the sun. Energy from the sun is called . . . . .

• Solar energy

• atoms

• Biofuels

• Fossil Fuels

Biofuels such as biodiesel can perform the same function as petrol or diesel. Therefore, the definition of biofuels is . . . . .

• Made from living things or fuel from plant materials

• Energy from the sun

• Large wall that holds back running water

We need to conserve the energy with 3R (recycling, reduce and reuse).

            One of example of recycling is . . . . .

Answer explanation

Making new glass bottles from old ones

Energy stored in the centre of an atom is called . . . . .

• nuclear energy

• Biofuels

• Solar Energy

• Converse

Limited sources of energy like fossil fuels take millions of years to form. Therefore, we need to conserve energy. Write two examples of conserving energy . . . .

Answer explanation

1.    Walk or ride bicycle instead of using other vehicles as transportation

2. 2.    Switch off all electrical appliances when they are not in use.

Which of the following are sources of energy?

• coal, wind

• the sun, running water

• coal, wind, the sun

• caol, wind, the sun and running water

What is one advantage of using renewabale sources of energy?

Answer explanation

Advantage of using renewabale sources of energy reduce air pollution, soil contamination, habitat destruction and land degradation.

Joe can see a wooden chest in a dark room with the help of a torch. Which of the following explains how Joe can see it?

• The torch reflects light into Joe’s eyes.

• Joe’s eyes reflects light towards the torch.

• Joe’s eyes reflects light into the wooden chest.

• The wooden chest reflects light into Joe’s eyes.

We can see a light bulb becouse the light it gives out goes directly into our eyes.

• 
• 

Limited sources of energy like fossil fuels take millions of years to form.

Therefore, we need to conserve energy. Write two examples of conserving energy!

Answer explanation

1. Walk or ride a bicycle instead of using other vehicles as transportation.

2. Switch off all electrical appliances when they are not in use.

3. Use a fan instead of an air

conditioner to cool

yourself down.