Earth, Moon, and the Sun - Class 7 Science Free MCQ Test with solutions

The apparent motion of celestial objects, such as the Sun, Moon, and stars, across the sky is mainly due to the rotation of the Earth on its axis. Key points include:

• As the Earth spins from west to east, celestial bodies seem to move from east to west.
• This motion creates an optical illusion based on our perspective on the rotating planet.
• The speed of rotation leads to the daily cycle of rising and setting.

Earth takes 365 days and 6 hours to complete its orbit around the Sun. Every 4 years, we add a leap day to make up for the extra 6 hours, creating a 366-day year.

Looking directly at a solar eclipse can damage your eyes permanently, even though the Sun is partially covered by the Moon. Always use proper viewing tools like special glasses.

A solar eclipse happens when the Moon moves between the Earth and the Sun, blocking sunlight from reaching certain parts of Earth.

The Earth’s rotation on its axis creates the cycle of day and night. As Earth spins, different parts of the planet move into and out of sunlight, causing day and night.

Celestial movements are important in traditional societies for predicting weather, guiding religious practices, and organizing timekeeping systems, such as calendars.

The tilt of Earth's axis causes different parts of the Earth to receive varying amounts of sunlight throughout the year, which leads to the changing seasons.

A lunar eclipse occurs when the Earth comes between the Sun and the Moon, blocking the sunlight and casting a shadow on the Moon. This results in the Moon appearing dark or reddish.

Ancient astronomers observed the movement of the Sun and Moon and created calendars to track time, helping with agricultural planning and religious festivals.

Equinoxes occur when Earth's axis is not tilted toward or away from the Sun; day and night are approximately equal in length.
This happens twice a year—around 21 March and 23 September—and helps us understand the Earth’s movement around the Sun and the tilt of its axis.

Seasons on Earth are mainly caused by the tilt of the Earth's axis and its revolution around the Sun. Because the axis is tilted, different parts of the Earth receive varying intensity and duration of sunlight at different times of the year. This results in seasonal changes.

• Tilt of the Earth's axis — This is a correct reason.

• Change in duration of sunlight — This happens due to the tilt and contributes to seasons.

• Spherical shape of earth influence season change

• Presence of the Moon — The Moon has no role in causing seasons.

Therefore, the presence of the Moon is NOT a correct reason for the occurrence of seasons on Earth.