Can you pass the PISA test?

This test consists of original questions taken from PISA tests from the last 14 years. PISA is a program designed to evaluate the performance of international students in OECD countries.Take the test to find out if your knowledge can compare to that of 15 year old students around the world!Challenge your friends and find out who gets the best results!

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If a wind generator is raised higher over the sea level, the blades will turn slower if the wind speed remains constant. Which of the following assertions explains this phenomenon?

• The force of gravity decreases with height
• The temperature decreases with height
• The air becomes less dense as the height increases

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