Worksheet Solutions: The Solar System - 1
Q1. Give one word for the following.
(i) The star around which all the planets move.
Ans: Sun
The Sun is the centre of the solar system. All planets move around it in fixed paths.
(ii) The path in which a planet moves around the Sun.
Ans: Orbit
An orbit is the fixed path along which a planet revolves around the Sun.
(iii) The imaginary line passing through the centre of the Earth from north to south.
Ans: Axis
The Earth rotates around its imaginary axis, which passes through the North and South Poles.
(iv) The planet known as the Red Planet.
Ans: Mars
Mars appears red because its surface is covered with red dust.
(v) The brightest planet, also called the morning or evening star.
Ans: Venus
Venus shines brightly and can be seen in the sky during morning and evening hours.
Q2. Choose the correct option.
(i) The planet that has 79 known moons is -(a) Mars
(b) Jupiter
(c) Saturn
(d) Neptune
Ans: (b) Jupiter
Jupiter has 79 known moons and is the largest planet in the solar system.
(ii) The planet that has rings made of ice and dust is -
(a) Earth
(b) Saturn
(c) Neptune
(d) Venus
Ans: (b) Saturn
Saturn's seven wide rings are made of ice and dust.
(iii) The Earth takes about ______ to complete one revolution around the Sun.
(a) 24 hours
(b) 30 days
(c) 365 days
(d) 7 days
Ans: (c) 365 days
It takes the Earth about 365 days or one year to revolve once around the Sun.
(iv) The planet nearest to the Sun is -
(a) Venus
(b) Earth
(c) Mercury
(d) Mars
Ans: (c) Mercury
Mercury is the smallest and closest planet to the Sun.
(v) The rotation of the Earth causes -
(a) Seasons
(b) Day and Night
(c) Winds
(d) Rain
Ans: (b) Day and Night
The Earth's rotation on its axis causes day and night.
Q3. Fill in the blanks.
(i) A planet moves around a ______.
Ans: star
Each planet revolves around a star; for our solar system, that star is the Sun.
(ii) The Earth's fixed path around the Sun is called its ______.
Ans: orbit
The orbit is the path followed by the Earth in its revolution around the Sun.
(iii) The Earth completes one rotation in about ______ hours.
Ans: 24
The Earth spins once around its axis every 24 hours.
(iv) The imaginary line dividing the Earth into two halves is called the ______.
Ans: equator
The equator divides the Earth into the northern and southern hemispheres.
(v) The revolution of the Earth around the Sun causes ______.
Ans: seasons
The tilt of the Earth's axis and its revolution around the Sun cause seasons.
Q4. True or False.
(i) Mercury and Venus have no moons.
Ans: True
They are the only planets without any natural satellites.
(ii) The Sun moves around the Earth.
Ans: False
The Earth moves around the Sun, not the other way around.
(iii) The Earth is known as the blue planet because it has water on it.
Ans: True
Earth appears blue from space due to its large water bodies.
(iv) Venus is the coldest planet in the solar system.
Ans: False
Venus is the hottest planet in the solar system.
(v) When it is summer in India, it is winter in Australia.
Ans: True
Because when the northern hemisphere tilts towards the Sun, the southern hemisphere tilts away.
Q5: Match the following.
Ans:
Q6: Answer the following questions in brief.
(i) What is the solar system?
Ans: The solar system consists of the Sun and all the objects that move around it, such as eight planets, their moons, and smaller bodies like asteroids and comets.
(ii) What are the inner and outer planets?
Ans: Mercury, Venus, Earth, and Mars are inner planets made of rock and metal. Jupiter, Saturn, Uranus, and Neptune are outer planets made of gases and are very cold.
(iii) What is rotation?
Ans: Rotation is the spinning movement of the Earth on its axis. The Earth completes one rotation in about 24 hours, causing day and night.
(iv) What is revolution?
Ans: Revolution is the movement of the Earth around the Sun in its orbit. It takes about 365 days to complete one revolution and causes seasons.
(v) Why is Earth called a unique planet?
Ans: Earth is the only planet that supports life because it has suitable temperature, water, and air containing oxygen.
Q5: Answer the following questions in detail.
(i) Explain how the rotation of the Earth causes day and night.
Ans: The Earth spins on its axis from west to east. Only the side facing the Sun receives light and has day, while the opposite side remains in darkness and has night. As the Earth keeps rotating, every place experiences both day and night in 24 hours.
(ii) Describe how the revolution of the Earth causes seasons.
Ans: The Earth's axis is tilted while it revolves around the Sun. When the northern hemisphere tilts towards the Sun, it gets more sunlight and has summer. At the same time, the southern hemisphere tilts away and has winter. After six months, the conditions reverse, causing the change of seasons.
(iii) Write short notes on the poles and the equator.
Ans:
At the poles, the Sun's rays fall at a very slanting angle, so these regions are extremely cold. Each pole has six months of daylight and six months of night.
The equator receives direct sunlight all year round, so it remains hot and has no distinct winter season.
(iv) What is a planet, and how does it differ from a star?
Ans: A planet is a large object that moves around a star and does not produce its own light. A star is a very hot object that makes its own light and heat by burning fuel inside. For example, the Sun is a star and Earth is a planet.
FAQs on Worksheet Solutions: The Solar System - 1
| 1. What are the eight planets in our solar system in order from the sun? |  |
| 2. Why is the sun so important to the solar system? | |
| 3. What's the difference between inner planets and outer planets? | |
| 4. How do I remember which planets have rings in the solar system? | |
| 5. What exactly is an asteroid, and where do they exist in the solar system? | |
