Practice Worksheet-Final Exam-Y4- 2023-2024

What does a ray diagram show?

• The direction from our eyes to the light source
• The direction in which light travels
• The source of light
• The objects we can see in the dark

We can __________ the objects if light source is present.

• hear
• smell
• see
• taste

What is an electrical circuit?

• lets you turn the energy on and off
• a closed path where electricity flows
• stop electricity from flowing through
• None of them

Light a form of

• energy
• rainbow
• gas
• matter

Why electrical wiring usually are covered with a layer of plastic?

• To make it look pretty
• To help electricity flow along the wire
• To make it safe
• To add more energy

Why is a bulb brighter when it is powered by two batteries rather than one?

• Because the flow of electricity in the circuit is less
• Because the flow of electricity in the circuit is the same
• Because the flow of electricity in the circuit is greater
• Because the flow of electricity will go backward

What happens if a wire in a circuit is broken?

• circuit gets stronger
• circuit stops working
• circuit gets dimmer
• circuit becomes invisible

What is the purpose of a wire in an electric circuit?

• to make circuit colorful
• to make circuit heavier
• to connect the different components and allow electricity to flow
• to make circuit smell nice

What does a switch do in an electric circuit?

• stops the flow of electricity
• speeds up the flow of electricity
• controls the flow of electricity
• changes the color of electricity

what will happen when a circuit is close?

• electricity will not flow
• electricity will flow
• there is a break in a circuit
• none of them