U4L4- Hot Air Balloons

What is buoyancy?

• The ability of an object to float in a fluid.

• The force that pulls objects downwards in a fluid.

• The resistance of an object to being submerged in a fluid.

• The speed at which an object sinks in a fluid.

What safety measures are important for hot air ballooning?

• Checking weather conditions, ensuring the balloon is in good condition, and having a qualified pilot.

• Flying only during the day without any prior checks.

• Using a hot air balloon without a licensed pilot.

• Ignoring weather forecasts and relying on experience.

How are cold air and hot air different besides temperature?

• Hot air is lighter than cold air.

• Cold air is denser than hot air.

• Hot air contains more moisture than cold air.

• Cold air is warmer than hot air.

What is the purpose of the envelope in a hot air balloon?

• To hold the hot air that makes the balloon rise.

• To provide a decorative appearance to the balloon.

• To store the fuel for the burner.

• To protect the passengers from the wind.

Why did people stop traveling by hot air balloon after the Wright Brothers invented the airplane?

• Traveling by airplane took less time.

• Hot air balloons became too expensive to operate.

• Airplanes were safer than hot air balloons.

• People preferred the comfort of airplanes over balloons.

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What does the word 'launch' mean?

• to start something in motion

• to delay an event

• to observe something closely

• to finish a task

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What is the role of the burner in a hot air balloon?

• To heat the air inside the balloon.

• To provide stability during flight.

• To control the altitude of the balloon.

• To create a colorful display of flames.

What is the main principle behind flight?

• The principle of lift, where air pressure differences create upward force.

• The principle of thrust, where engines propel the aircraft forward.

• The principle of buoyancy, where lighter objects rise in heavier fluids.

• The principle of drag, where air resistance slows down the aircraft.

What is a hot air balloon?

• A balloon that rises in the air when heated air inside it becomes lighter than the cooler air outside.

• A type of balloon that is filled with helium to float in the air.

• A large balloon used for advertising purposes that does not fly.

• A balloon that is filled with water and used for games.

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What is the difference between hot air and cold air?

• Hot air is heavier and sinks, while cold air is lighter and rises.

• Hot air is lighter and rises, while cold air is heavier and sinks.

• Hot air and cold air have the same weight and behavior.

• Hot air is denser than cold air.