4th grade energy

Question 1

Energy resources: which statement is NOT true?

• A. Solar panels do not produce electricity at night.
• B. Wind turbines burn fuel to turn.
• C. Hydroelectric power uses falling water.
• D. Nuclear power stations do not release carbon dioxide while generating electricity.

Question 2

A ball rolled down a ramp from three different heights and hit a wooden block. Which release height gave the ball the most energy when it hit?

• A. low
• B. medium
• C. high

Question 3

Four cups of water at 70 °C were wrapped in different materials. The chart shows each temperature after 20 minutes. Which wrap was the best thermal insulator?

• A. no wrap
• B. paper
• C. cotton
• D. wool

Question 4

Which energy is wasted by an old filament light bulb?

• A. nuclear energy
• B. light
• C. thermal energy (heat)
• D. chemical energy

Question 5

True or false? Light from the Sun carries energy to Earth.

• A. True
• B. False

Question 6

What is one environmental effect of using oil?

• A. covers a large area of land, but makes no fumes while running
• B. makes no smoke but leaves dangerous waste that must be stored safely for a very long time
• C. spills can harm sea life, and burning it adds carbon dioxide
• D. mining scars the land and burning it releases carbon dioxide and smoke

Question 7

A loud firework explodes. Which ways is energy transferred?

• A. light, sound and heat
• B. only electric current
• C. only sound
• D. no energy is transferred

Question 8

Why are saucepans made of metal but have plastic or wooden handles?

• A. Metal conducts heat to the food; the handle insulates your hand.
• B. Metal handles are too light.
• C. Plastic makes the pan heat faster.
• D. Wood is a good thermal conductor.

Question 9

Why does a fast-moving football hurt more to stop than a slow one?

• A. It is heavier when it moves fast.
• B. It has more energy of motion to transfer to your hands.
• C. Fast balls are hotter.
• D. Slow balls have no energy.

Question 10

Why are many countries building more wind and solar farms?

• A. They work only at night.
• B. They are renewable and do not release carbon dioxide while making electricity.
• C. They use up coal.
• D. They make the weather windier.

Question 11

Is this a thermal conductor or a thermal insulator: aluminium (aluminum)?

• A. thermal conductor (lets heat through easily)
• B. thermal insulator (slows heat down)

Question 12

True or false? Speed has nothing to do with energy.

• A. True
• B. False

Question 13

Two toy cars crash. You hear a bang and the bumpers get slightly warm. Where did some of the motion energy go?

• A. into the air as wind
• B. into sound and heat
• C. into light only
• D. it was destroyed

Question 14

Which energy store is most important here: a running dog?

• A. gravitational potential (height)
• B. kinetic (movement)
• C. thermal (heat)
• D. elastic potential (stretch or squash)

Question 15

Why are fossil fuels called non-renewable?

• A. They come from the Sun each day
• B. They took millions of years to form and are used much faster
• C. They cannot be burned
• D. They are made in factories

Question 16

True or false? Some energy in a collision is transferred as sound.

• A. True
• B. False