Practice Pakistan questions with answers and explanations.
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Earth's tilted axis changes the angle and duration of sunlight during its orbit.
This produces the seasons.
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Isaac Newton formulated three laws of motion and the law of universal gravitation.
His work shaped classical physics.
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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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The joule is the SI unit of energy and work.
It is named after James Prescott Joule.
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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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Nitrogen makes up about 78% of Earth's atmosphere.
Oxygen is the second-most abundant gas.
