IGCSE U4 forces and energy

A closed system is one in which:

• a) Energy and matter can enter and leave freely
• b) Energy can enter and leave freely, but matter cannot
• c) Neither energy nor matter can enter or leave
• d) Matter can enter and leave freely, but energy cannot

Conservation of energy states that:

• a) Energy can be created or destroyed in any process
• b) Energy is always conserved in a closed system
• c) Energy decreases over time
• d) Energy can only be transformed into matter

Efficiency is a measure of:

• a) The total energy of a system
• b) The ability of a system to do work
• c) The ratio of useful energy output to total energy input
• d) The amount of energy lost as heat

Elastic potential energy is energy stored in:

• a) Moving objects
• b) Chemical bonds
• c) Stretched or compressed objects
• d) Objects at rest

Energy resources are:

• a) Renewable sources of energy
• b) Natural resources used to generate electricity
• c) Sources of energy used in industry
• d) Sources of energy used to power machines and devices

Fossil fuels are:

• a) Renewable energy sources
• b) Clean sources of energy
• c) Non-renewable energy sources formed from decayed plants and animals
• d) Sources of energy derived from wind and sunlight

Gravitational potential energy is energy due to:

• a) Motion
• b) Position relative to the Earth's surface
• c) Chemical reactions
• d) Nuclear reactions

The joule is the unit of measurement for:

• a) Power
• b) Energy
• c) Force
• d) Velocity

Kinetic energy is the energy associated with:

• a) Motion
• b) Position
• c) Height
• d) Temperature

Power is the rate at which:

• a) Energy is transferred or converted
• b) Energy is stored in a system
• c) Work is done on an object
• d) Forces act on an object