Science End of Term Revision Quiz G5

What is a force?

• An object that stays still

• A push, pull, twist, or turn

• A method of measuring energy

• A tool used for experiments

Answer explanation

A force is defined as a push, pull, twist, or turn that can change the motion of an object. This definition encompasses various types of interactions, making it the correct choice among the options provided.

Which of the following is a contact force?

• Gravity

• Friction

• Magnetism

• Electrostatic force

Answer explanation

Friction is a contact force because it arises from the interaction between surfaces in contact. In contrast, gravity, magnetism, and electrostatic forces act at a distance without direct contact.

What does buoyancy allow objects to do?

• Stick to magnetic materials

• Stay in one place

• Float in a liquid or gas

• Generate heat

Answer explanation

Buoyancy allows objects to float in a liquid or gas by providing an upward force that counteracts gravity. This is why the correct answer is 'Float in a liquid or gas', as it directly relates to the concept of buoyancy.

Which force is responsible for pulling objects towards the Earth?

• Magnetism

• Friction

• Gravity

• Electrostatic force

Answer explanation

Gravity is the force that attracts objects towards the Earth, pulling them downwards. It is a fundamental force that acts on all masses, unlike magnetism, friction, or electrostatic forces, which have different effects.

Select all the forces

• Magnetism

• Buoyancy

• Friction

• Push and pull

• A magnet attracting iron nails

Answer explanation

The correct choices are Magnetism, Buoyancy, Friction, and Push and pull, as they all represent types of forces. A magnet attracting iron nails is an example of magnetism, not a separate force.

What is energy?

• The ability to do work or cause change

• The measure of heat in a substance

• A type of force

• A tool for measuring temperature

Answer explanation

Energy is defined as the ability to do work or cause change, making it a fundamental concept in physics. The other options describe different concepts, but only the first accurately defines energy.

Which form of energy powers devices?

• Light energy

• Heat energy

• Electrical energy

• Sound energy

Answer explanation

Electrical energy powers devices by providing the necessary energy to operate them. Unlike light, heat, or sound energy, electrical energy is the primary source for most electronic devices.

What kind of energy is stored in food and fuels?

• Light energy

• Chemical energy

• Magnetic energy

• Heat energy

Answer explanation

Food and fuels contain chemical energy, which is the energy stored in the bonds of chemical compounds. When these compounds are broken down during digestion or combustion, this energy is released for use.

Which of these is an example of sound energy?

• The warmth of the Sun

• A vibrating guitar string

• A fan turning on

• A refrigerator magnet

Answer explanation

A vibrating guitar string produces sound energy through its vibrations, creating sound waves. The other options represent different forms of energy, but only the vibrating string directly generates sound.

Match the form of energy to its example:

• Chemical energy

• Light energy

• Sound energy

• Magnetic energy

• The sound from a drum

Answer explanation

Chemical energy is stored in substances, light energy is emitted by sources like the sun, sound energy is produced by vibrations (e.g., a drum), and magnetic energy relates to magnetic fields.