Chapter 15 The Boy Who Harnessed the Wind

In what country does the movie take place?

• Malawi

• Rawanda

• South Africa

• Zimbabwe

What is the primary scientific principle demonstrated by the windmill built by the boy in 'The Boy Who Harnessed the Wind'?

• Electromagnetism

• Aerodynamics

• Thermodynamics

• Hydrodynamics

Which material is most suitable for constructing the blades of a windmill to maximize efficiency?

• Wood

• Plastic

• Metal

• Fabric

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What type of energy conversion takes place in a windmill?

• Kinetic to Electrical

• Thermal to Mechanical

• Chemical to Thermal

• Potential to Kinetic

In the context of wind energy, what does the term 'cut-in speed' refer to?

• The speed at which a wind turbine starts generating power

• The maximum speed a wind turbine can handle

• The speed at which a wind turbine stops generating power

• The average speed of wind in a given area

Which scientific law explains the lift force that allows windmill blades to rotate?

• Newton's First Law

• Bernoulli's Principle

• Pascal's Law

• Hooke's Law

What is the role of a generator in a wind turbine?

• To convert electrical energy into mechanical energy

• To store energy for later use

• To convert mechanical energy into electrical energy

• To increase the speed of the wind

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How does the design of a windmill blade affect its efficiency?

• Longer blades capture more wind and generate more power

• Shorter blades are more efficient in high winds

• Blade shape has no effect on efficiency

• Blade color affects energy output

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What is the main environmental benefit of using wind energy?

• It produces greenhouse gases

• It is a renewable source of energy

• It requires large amounts of water

• It is a non-renewable source of energy

Which of the following is a challenge associated with wind energy?

• It is always available

• It produces a lot of waste

• It is dependent on weather conditions

• It is a finite resource

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