Space Physics 1 IGCSE

What causes the cycle of day and night on Earth?

• The Earth's orbit around the Sun

• The Earth's rotation on its tilted axis

• The Moon's rotation around the Earth

• The Earth's elliptical orbit

How long does it take for the Earth to orbit the Sun once?

• 30 days

• 24 hours

• 365 days

• 7 days

Which equation defines average orbital speed?

• 𝑣 = 𝑟 ⋅ 𝑇 2𝜋

• 𝑣 = 2𝜋𝑟/𝑇

• 𝑣 = 𝑇/𝑟

• 𝑣 = 𝑟/𝑇

How long does it take for the Moon to orbit the Earth?

• One day

• One week

• One month

• One year

Which of the following is a dwarf planet in the Solar System?

• Mars

• Venus

• Pluto

• Jupiter

Planets, minor planets, and comets have what type of orbits?

• Circular

• Elliptical

• Parabolic

• Hyperbolic

Which planets are rocky and small in comparison to the others in the Solar System?

• Jupiter, Saturn, Uranus, and Neptune

• Mercury, Venus, Earth, and Mars

• Pluto and Ceres

• Saturn and Jupiter

What factor explains why the planets orbit around the Sun?

• Magnetic forces

• The Sun's rotation

• The Sun's gravitational attraction

• Earth's magnetic field

How does the strength of a planet's gravitational field change with distance from its surface?

• It increases as distance increases

• It decreases as distance increases

• It remains constant regardless of distance

• It fluctuates with temperature

Why do planets farther from the Sun have slower orbital speeds?

• They are smaller in size

• They are less dense

• The Sun's gravitational pull weakens with distance

• Their orbits are circular