Practice PMS questions with answers and explanations.
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Archimedes' principle relates buoyant force to displaced fluid.
The upward force equals the weight of the displaced fluid.
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Average speed is total distance divided by total time.
Thus, 120 ÷ 2 = 60 km/h.
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Gravity attracts masses toward one another.
Near Earth, it pulls objects toward the ground.
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Gravity continuously accelerates the ball downward.
After slowing to a stop, it begins falling.
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Friction resists sliding or rolling between surfaces.
It can produce heat and slow moving objects.
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Grooves help tyres maintain contact with the road.
They also channel water away and reduce skidding.
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Oil forms a lubricating layer between moving surfaces.
This reduces friction, wear, and overheating.
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The metre is the SI base unit of length.
It is used to measure distance and dimensions.
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The kilogram is the SI base unit of mass.
Mass measures the amount of matter in an object.
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The second is the SI base unit of time.
Larger time units are derived from it.
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A thermometer measures temperature.
It may use liquid expansion, electronic sensors, or infrared radiation.
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A barometer measures atmospheric pressure.
Pressure changes can help indicate weather changes.
