Energy Multiple Choice Questions Set 3

What name is given to the energy stored when an object is stretched or compressed?

• chemical potential energy

• elastic potential energy

• gravitational potential energy

• kinetic energy

What is the equation used to calculate kinetic energy?

• kinetic energy = mass × speed × height

• kinetic energy = 0.5 × mass × (speed)²

• kinetic energy = 0.5 × mass × speed

• kinetic energy = mass × (speed)²

Which statement about energy is not correct?

• energy can be destroyed

• energy can be stored

• energy cannot be created

• energy can be transferred

An electric motor does 1 920 000J of work in 30 seconds. What is the power of the motor?

• 64W

• 64kW

• 640kW

• 6400W

0.5kg of water is heated from 20°C to 60°C. Specific heat capacity of water = 4200J/kg °C. What is the change in thermal energy of the water? Use the equation ΔE = m c Δθ.

• 42 000J

• 84 000J

• 126 000J

• 168 000J

Which of the following energy resources is renewable?

• coal

• nuclear

• oil

• wind

What is a disadvantage of using the Sun as an energy resource?

• it produces polluting gases

• it is only available during daylight

• it is non-renewable

• it produces radioactive waste

Which pathway describes the change in the way energy is stored in a ball travelling upwards into the air?

• gravitational potential energy → thermal energy

• chemical potential energy → elastic potential energy

• kinetic energy → gravitational potential energy

• elastic potential energy → thermal energy

A TV is supplied with 14500J of energy. 2755J of energy is dissipated to the surroundings. What is the percentage efficiency of the TV?

• 12%

• 19%

• 28%

• 81%

A person standing on a ladder 1.5m above the ground has a gravitational potential energy store of 1205J. What is the mass of the person to the nearest kilogram? Gravitational field strength on Earth = 9.8N/kg.

• 82kg

• 123kg

• 184kg

• 79kg