Science Quiz PACT 5

During your classroom experiment, you used different materials to test whether they allow electricity to pass through. When you connect a pencil lead (graphite) to an electric circuit, the bulb lit up. What is the science behind this?

Answer explanation

Graphite allows electricity to flow because it is a conductor.

What happens when light hits a smooth and shiny surface like a mirror?

• It passes through the surface.

• It bends and changes speed.

• It bounces back.

When a straw is placed in a glass of water, why does it look bent?

• Light slows down and changes direction.

• The straw is actually bent.

• The water absorbs the straw's image.

What helps create a holographic image in a simple DIY projector?

• Reflection of light

• Magnetic force

• Heat energy

A hologram works because of the way light...

• Spreads in all directions equally.

• Interferes and creates a 3D illusion.

• Travels in only straight lines.

Arjun is trying to balance two small pieces of potato using a toothpick. What is the best way to keep them balanced?

• Find the center of gravity and adjust the position.

• Stick the toothpick anywhere and hope it balances.

• Hold the potatoes with her hands the whole time.

Which of these is needed to complete a working electric circuit?

• Battery, wire, and a closed path

• Only a battery

• Only a wire

In a simple electric circuit, how does electricity flow?

• From the negative side of the battery to the positive side

• From the positive side of the battery to the negative side

• Randomly in all directions

Kavya wants to reuse a plastic bottle instead of throwing it away. She cuts the bottle and attaches a balloon to it. What could be the purpose of this experiment?

• To create a simple air pump using air pressure

• To see if plastic bottles can float

• To make a balloon fly higher

During a class experiment, students used a flashlight and a glass prism. They noticed a rainbow appeared. What caused this?

• The prism reflected the light into different colors

• The prism absorbed all the light

• The prism created a shadow