The Solar System- 2 - Free MCQ Practice Test with solutions, Class 4 Science

• During summer in the northern hemisphere, the North Pole is tilted towards the Sun, so it has sunshine all the time.
• This means it's always bright at the North Pole.
• At the same time, the South Pole has night all the time.
• This happens because of how the Earth is tilted.
• So, in summer, the North Pole is bright, and the South Pole is dark all the time.

Venus is the hottest planet in our solar system. It shines very brightly and is often called the morning star or the evening star because it can be seen in the morning and evening skies. Venus does not have any moons.

The Earth completes one rotation in about 24 hours. Rotation means the Earth spinning like a top, completing one full turn. It takes a whole day for the Earth to spin around once, making it daytime and nighttime for all of us.

Uranus is the odd one out as  Mercury , Venus and Mars are all inner planets and Uranus is an outer planet.

Life is found on Earth because it has the right conditions like the right temperature, water, and air with oxygen. Other planets may not have these things, so they might not have life like Earth does.

The pattern of stars that forms a shape, such as a bear, is known as a constellation.

Correct Answer: b) The tilt of Earth's axis

Explanation:

• The primary cause of Earth's seasons is the 23.5° tilt of Earth's axis relative to its orbit around the Sun.

• This tilt causes different parts of Earth to receive varying amounts of sunlight throughout the year:

  • When the Northern Hemisphere is tilted toward the Sun, it experiences summer, and the Southern Hemisphere has winter.

  • When the Southern Hemisphere is tilted toward the Sun, the reverse happens.

• Let's quickly check the other options:

  • a) Earth's distance from the Sun – Incorrect. Earth's orbit is nearly circular, so distance doesn't change much.

  • c) The presence of the Moon – Incorrect. The Moon affects tides, not seasons.

  • d) The rotation of Earth – Incorrect. This causes day and night, not seasons.