All MCQs

Saturn has an extensive system of icy rings.
Other giant planets also have rings, but Saturn's are most visible.

Iron oxide minerals give Mars its reddish appearance.
The planet has polar ice caps and a thin atmosphere.

Jupiter is the largest planet by mass and diameter.
It is a gas giant with a powerful magnetic field.

Mercury has the smallest orbit around the Sun.
It completes a revolution in about 88 Earth days.

Light travels at about 300,000 kilometers per second in vacuum.
The exact value is approximately 299,792 km/s.

An anemometer measures the speed of moving air.
It is commonly used at weather stations.

A seismograph records ground motion caused by earthquakes.
The recorded trace is called a seismogram.

A thermometer measures temperature.
Different types use liquids, electronics, or infrared radiation.

A barometer measures the pressure exerted by the atmosphere.
Falling pressure may indicate an approaching low-pressure system.

Electric current is measured in amperes.
An ampere equals one coulomb of charge per second.

Power is the rate of doing work or using energy.
Its SI unit is the watt.

The joule is the SI unit of energy and work.
It is named after James Prescott Joule.