A3 Summary in Kognity 10 MCQ

What is the unit of measurement for energy and work?

• Joules

• Watts

• Volts

• Amps

What is mechanical energy?

• The energy stored in fuels

• The energy transferred to the surroundings as thermal energy

• The sum of kinetic energy, gravitational potential energy, and elastic potential energy

• The energy density of a fuel

When are resistive forces present?

• When mechanical energy is conserved

• When work is done

• When energy is transferred

• When friction and drag are present

What happens to mechanical energy when resistive forces are present?

• It is conserved

• It is transferred to the surroundings as thermal energy

• It is converted into electrical energy

• It is stored in fuels

What is power?

• The rate of energy transfer

• The rate of work done

• The energy stored in fuels

• The energy density of a fuel

What is efficiency?

• The ratio of useful energy output to total energy input

• The ratio of useful power output to total power input

• The rate of energy transfer

• The rate of work done

How is most electrical and mechanical energy generated?

• By harnessing the energy stored within fuels

• By converting thermal energy into mechanical energy

• By converting mechanical energy into electrical energy

• By transferring energy from one store to another

What is energy density?

• The energy stored in fuels

• The energy transferred to the surroundings as thermal energy

• The sum of kinetic energy, gravitational potential energy, and elastic potential energy

• The energy to volume ratio for a fuel

What is the range of efficiency?

• 0% to 50%

• 50% to 100%

• 0% to 100%

• 0% to 200%

Who is the target audience for this quiz?

• Grade 11 students

• Grade 12 students

• College students

• Professionals