Practice Pakistan questions with answers and explanations.
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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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Carbon dioxide is a major greenhouse gas released by fossil-fuel use.
It traps heat in Earth's climate system.
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Recycling processes used materials into new products.
It can reduce waste and demand for raw resources.
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Erosion removes and transports soil or rock.
Water, wind, ice, and gravity can cause it.
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Force is measured in newtons in the SI system.
The unit is named after Isaac Newton.
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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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Most atmospheric ozone is concentrated in the stratosphere.
It absorbs much of the Sun's harmful ultraviolet radiation.
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A water molecule contains two hydrogen atoms and one oxygen atom.
Its formula is H₂O.
