Exam review

Which planet is a gas giant?

• Mercury

• Venus

• Jupiter

• Mars

One astronomical unit is equal to:

• 150 km

• 150 000 km

• 1 500 km

• 150 000 000 km

Which best describes Earth’s position from the sun?

• Earth is the first planet from the sun.

• Earth is the third planet from the sun.

• Earth is the sixth planet from the sun.

• Earth is the seventh planet from the sun.

Why is Pluto no longer considered a planet?

• Pluto is not in orbit around a star.

• Pluto does not dominate its orbit.

• Pluto is not close enough to the sun.

• Pluto is not spherical.

A year is based on the

• Earth’s rotation

• Earth’s revolution

• Moon’s revolution

• Sun’s rotation

Mercury is the hottest planet.

• True

• False

What is static electricity?

• An object with equal numbers of protons and electrons.

• The force from an object with electricity.

• The transfer of electrons between objects.

• An imbalance of electric charges on an object's surface.

What does the law of electric charges state?

• Like charges repel each other

• Like charges attract each other

• Unlike charges repel each other

• Neutral charges attract each other

Which is a characteristic of a good conductor?

• Protons move easily through them.

• Electrons move easily through them.

• Positive charges do not move easily.

• They have a lot of resistance.

Which of these is an energy source for an electric power station?

• moving water

• steam

• wind

• all of the above