Olympiad Test Level 1: Earth and Universe - Class 3 MCQ

Pluto was once called the ninth planet in our solar system. But in 2006, scientists decided that Pluto is not a full planet anymore.
It is now called a dwarf planet because it does not meet all the rules to be a planet.

Neptune, Mars, and Jupiter are still real planets in our solar system.

Neil Armstrong was the first person to walk on the Moon. He did this on July 20, 1969. He said, "That's one small step for man, one giant leap for mankind."

• Aryabhatta was a scientist from India but he did not go to the Moon.
• Kalpana Chawla and Sunita Williams went to space, but not to the Moon.

The Earth takes 365 days to move around the Sun in a fixed path. This movement is called Revolution.
There are 8 planets in our solar system ,and earth is third from sun,and all stars have their own heat and light
Sun is also a star.

The Earth rotates from West to East. This is why the Sun rises in the East and sets in the West.
The Earth's rotation causes day and night.
So the correct answer is Option D - West to East.

The Earth has two main movements:

1. Rotation: The Earth spins on its axis, causing day and night.
2. Revolution: The Earth moves around the Sun in an orbit, causing the seasons.

These two movements are what make life on Earth possible.

Comets are small celestial objects made of frozen gases, rocks, and dust that orbit the Sun.
They often have a bright tail that we can see when they get close to the Sun. The heat from the Sun causes the frozen gases to turn into gas and dust, forming the tail.
Comets are sometimes called "dirty snowballs" because of their icy and rocky composition.
So the correctv answer is Option D.

The Moon is different from the others because it is not a planet. Venus, Jupiter, and Saturn are all planets in our solar system, while the Moon is a satellite of Earth.
A satellite is an object that orbits around a planet, and the Moon orbits Earth.
So, the correct answer is Option B.

A solar eclipse happens when the Moon comes between the Sun and the Earth.
This causes the Moon to block the Sun's light from reaching Earth, and for a short time,
the Sun appears to be covered by the Moon.
A solar eclipse can only happen during the new moon phase when the Moon is in the right position to block the Sun.
So, the correct answer is Option A.

The spinning of the Earth on its axis is called rotation. This spinning is what causes day and night.
As the Earth rotates, one side faces the Sun and experiences daylight,
while the other side is in darkness and experiences night.
It takes about 24 hours for the Earth to complete one full rotation, which is why we have a 24-hour day.
So, the correct answer is Option B - Rotation.

The gibbous moon is a phase of the Moon that happens during its monthly cycle.
When the Moon is in the gibbous phase, we can see more than half of it shining, but not the whole Moon.
So, the correct answer is Option D.

Constellations are patterns made by stars in the night sky. These stars might look close to each other, but they are actually far apart in space. 
People have named these patterns after animals, people, or objects.
For example, the constellation Orion looks like a hunter, and Ursa Major looks like a big bear.
So, constellations are just stars that look like they are in a pattern when we look at them from Earth.

If the Earth is as big as a cricket ball. Then, the Moon would be much smaller, like a table tennis ball.
This helps us understand how small the Moon is compared to Earth.

The Moon takes about one month (29.5 days) to complete a full cycle. This cycle is called the lunar cycle. During this time, the Moon goes through different phases.
We see the Moon change from a new moon (when it's not visible), to a crescent moon (a small sliver), to a half moon (half of the Moon is visible),
and finally to a full moon (when we can see the whole Moon).
After the full moon, the Moon starts changing again until it reaches the new moon. This cycle repeats every month!

The Sun and the Moon look about the same size in the sky, but they are not the same size. The Sun is actually much bigger than the Moon.
However, the Sun is very far away from Earth, while the Moon is much closer. Because the Sun is so far away,
 it looks the same size as the Moon, even though the Moon is much smaller.
This is why, during a solar eclipse, the Moon can cover the Sun perfectly, creating the illusion that they are the same size.
So the correct Answer is Option - D.

The seasons change because the Earth orbits (moves in a circle) around the Sun, but it is tilted.
This tilt means that different parts of the Earth get more or less sunlight during different times of the year.
When one part of Earth gets more sunlight, it is summer there, while the other part has winter.
This is why we have different seasons like spring, summer, fall, and winter.
So, the correct answer is - Option C.