A fan is connected to a battery by wires. What happens if the wire is cut from the fan?

• The fan stops working.

• The fan slows down.

• The fan speeds up.

• The battery stops working.

Look at the diagram. Which letter shows the switch?

• A

• B

• C

• D

Which part of a simple circuit is the source of energy or electricity?

• bulb

• switch

• wire

• battery

What does a switch in a simple circuit do to be able to make a bulb glow?

• It makes electricity.

• It breaks a circuit.

• It completes the circuit.

Why are electrical wires covered in plastic?

• Plastic is a good conductor.

• Plastic is a good insulator.

• It protects the wires.

• It looks pretty.

Mr. Khan tests 5 different objects to see if electricity will flow through them. He attaches each object to the circuit with clamps. The bulb will light if electricity flows through the object.

What should Mr. Khan do after he attaches each object to the circuit?

• Watch and then record what happens to the bulb.

• Try to guess what will happen.

• Play with the switch.

• Attach another object.

Omar has three bowls filled with lemon juice. He wants to see what happens if he adds vinegar, water or baking soda. His results are shown in the table. Based on Omar’s results, what is the best way to make bubbles?

• Add water

• Add water and vinegar

• Add baking soda

• Add water

Sara wants to compare the mass of two small pencil bags. Which is the best piece of equipment to use?

• Balancing scale

• measuring cylinder

• ruler

• magnifying glass

If Abdulla wants to compare the time it takes for water to evaporate in two different places. He must choose the two jugs with the most similar amount of water. Which two jugs should he choose?

• 1 and 3

• 2 and 3

• 1 and 4

• 3 and 4

What unit of measurement do we use to show the melting point of something?

• liters

• grams

• degrees Celsius

• centimeters