Practice Pakistan questions with answers and explanations.
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An anemometer measures wind speed.
It is commonly used at weather stations.
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Johannes Gutenberg developed a movable-type printing system in Europe.
It greatly expanded the production of books.
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Light travels at about 300,000 kilometers per second in vacuum.
The exact value is approximately 299,792 km/s.
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James Watt greatly improved steam-engine efficiency.
His work supported the Industrial Revolution.
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Common salt is sodium chloride.
Its chemical formula is NaCl.
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Mercury is the innermost planet of the Solar System.
It completes an orbit faster than any other planet.
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Human cells use oxygen in cellular respiration.
The process releases energy from food molecules.
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Jupiter is the largest planet by mass and diameter.
It is a gas giant with many moons.
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Solar radiation drives weather, climate, and photosynthesis.
Other energy sources are much smaller for the surface system.
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Mars appears reddish because of iron oxide on its surface.
It is therefore called the Red Planet.
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Wind turbines convert the kinetic energy of moving air into electricity.
It is a renewable energy source.
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Saturn has an extensive system of icy rings.
Other giant planets also have rings, but Saturn's are most visible.
