Grade 8 Science Revision Quiz

What is the main reason for the changing seasons on Earth?

• The tilt of the Earth's axis.
• Ocean currents affect the weather.
• The rotation of the Earth on its axis.
• The distance from the Sun changes.

What would happen if the time it took for Earth to make one rotation around its axis increased?

• Seasons would change every week, disrupting agriculture.
• The Earth's rotation would stop completely, causing chaos.
• Days would become shorter, leading to cooler temperatures.
• Days would become longer, affecting climate and biological rhythms.

What is the phase of the Moon when it appears completely lit from Earth?

• Full Moon
• Waxing Crescent
• New Moon
• Waning Gibbous

When does a solar and lunar eclipse take place?

• A solar eclipse takes place when the Moon is between the Earth and the Sun; a lunar eclipse occurs when the Earth is between the Sun and the Moon.
• A lunar eclipse takes place when the Sun is between the Earth and the Moon.
• A solar eclipse occurs when the Earth is between the Moon and the Sun.
• A solar eclipse happens during a full moon phase.

Identify which galaxy Earth belongs to and describe its characteristics.

• Milky Way galaxy
• Whirlpool galaxy
• Andromeda galaxy
• Triangulum galaxy

Arrange the planets in order based on their distance from the sun.

• Mars, Earth, Venus, Mercury, Saturn, Jupiter, Neptune, Uranus
• Venus, Earth, Mars, Jupiter, Saturn, Neptune, Uranus, Mercury
• Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
• Earth, Mars, Venus, Mercury, Jupiter, Saturn, Neptune, Uranus

List the terrestrial and gas giants planets.

• Terrestrial planets: Neptune, Uranus; Gas giants: Earth, Mars
• Terrestrial planets: Jupiter, Saturn; Gas giants: Mercury, Venus
• Terrestrial planets: Pluto, Ceres; Gas giants: Mars, Earth
• Terrestrial planets: Mercury, Venus, Earth, Mars; Gas giants: Jupiter, Saturn

A scientist observes a celestial object made of ice and rock with a bright tail when it nears the sun. What is the name of this object?

• planet
• meteor
• comet
• asteroid

What unit do astronomers use to measure the vast distances between galaxies?

• astronomical unit
• light-year
• parsec
• kilometer

Predict what would happen if Earth's gravity suddenly disappeared. How would objects on the planet be affected?

• Objects would become heavier and sink into the ground.
• All objects on Earth would float away into space.
• All objects would remain on the surface as if nothing changed.
• Objects would instantly turn into gas and dissipate.