Practice PPSC questions with answers and explanations.
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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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Saturn has an extensive system of icy rings.
Other giant planets also have rings, but Saturn's are most visible.
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The Moon is Earth's only natural satellite.
It orbits Earth and influences ocean tides.
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Power is the rate of doing work or using energy.
Its SI unit is the watt.
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Electric current is measured in amperes.
The unit is named after André-Marie Ampère.
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A barometer measures atmospheric pressure.
It is useful in weather observation and forecasting.
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A thermometer measures temperature.
Different types use liquids, electronics, or infrared radiation.
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A seismograph records ground motion caused by earthquakes.
The recorded trace is called a seismogram.
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An anemometer measures wind speed.
It is commonly used at weather stations.
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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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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.
