Science Physics Topics Flashcards

What is the boiling point of water at standard pressure?

Answer: 100°C

Water boils at 100°C (212°F) at standard atmospheric pressure (1 atm).

Which of the following is an example of a reversible change?

Answer: Melting ice

Melting ice is reversible — ice can melt to water and water can freeze back to ice. Burning and cooking cannot be reversed.

What type of energy is stored in food?

Answer: Chemical energy

Food stores chemical energy in the bonds of its molecules. When we digest food, this energy is released for our body to use.

In a simple electrical circuit, what does a switch do?

Answer: Controls the flow of current by opening or closing the circuit

A switch controls whether current flows by opening (breaking) or closing (completing) the circuit.

Which material is a good insulator of heat?

Answer: Wood

Wood is a poor conductor of heat (good insulator), which is why pot handles are often made of wood to prevent burns.

What is the name of the force that pulls objects toward the centre of the Earth?

Answer: Gravity

Gravity is the force that pulls all objects toward the centre of the Earth, giving them weight.