WBBSE Solutions For Class 6 Geography Chapter 1 The Sun The Stars In The Sky Topic B The Solar System

Class 6 Geography WBBSE Chapter 1 The Sun The Stars In The Sky Topic B The Solar System Analytical Type Questions

Question 1. How was the solar system formed?
Answer:

Formation solar system:

There are many theories about how the solar system was formed.

Some of these are as follows—

1. Most scientists believe that the solar system was born from a massive explosion of a gigantic, whirling mass of particles of space matter and gases.

2. Slowly, particles of dust, hydrogen, and helium compressed together to form a dense mass-the Sun.

3. The extreme gravitational force exerted by the center of this mass caused the collision of atoms and resulted in the generation of energy.

As time went on, this mass attracted even more space matter and started growing in volume. This swirling ball of fire started radiating heat and light.

5. Finally, clouds made up of dust particles and gaseous compounds, started revolving around the Sun as a result of the Sun’s gravitational force.

It is from these clouds that the planets formed over time.

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Question 2. What do you know about the structure of the Sun? What is the solar atmosphere?
Answer:

The structure of the Sun:

The Sun is a medium-sized, yellow star that is about 4.6 billion years old.

It is a swirling mass of hydrogen, helium, nitrogen, oxygen, and other gaseous matter.

Apart from this, solid metal elements like gold, silver, nickel, and iron are also present but in gaseous form due to incredibly high temperatures.

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The region of the Sun, categorized on differences in light and heat is given below—

1. Core: The innermost part of the Sun, where hydrogen is compressed to produce helium and release energy through nuclear fusion.

The temperature at the core is estimated to be 15 million degrees Celsius.

2. Radiative zone: This is the intermediate zone between the super-dense core and the outer layer.

This is the part that is visible to the naked eye as a red, luminous mass. Solar storms flare up in this part of the Sun.

 

 

Convective zone: This is the outermost layer of the interior of the Sun. In this zone, energy is transported by convection. This is actually the surface of the sun where light is created. So the outer part of this layer is called Photosphere.

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Solar atmosphere: The solar atmosphere is made up of three parts—

1. The Photosphere,

2. The Chromosphere and

3. The Corona.

The Photosphere is the first region of the Sun that is visible to us. As the temperature decreases, the part of the solar atmosphere visible as red flashes is the Chromosphere.

The Corona is the outermost part of the Sun’s atmosphere. This is visible to the naked eye only during the total solar eclipse at moments of totality.

Question 3. What are the special features of the Sun?
Answer:

Special features of the Sun:

The Sun is the only star in our solar system. This huge, swirling ball of gas is also the brightest heavenly body in our solar system. The special features of the Sun are:

 

 

Question 4. Describe the smallest planet in the solar system.
Answer:

The smallest planet in the solar system:

The smallest planet in the solar system is Mercury. This is also the planet nearest to the Sun. Some important facts about Mercury:

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Question 5. Describe the planet venus
Answer:

The planet venus:

The planet that lies second to the Sun is Venus. This is the closest planet to our Earth and also the sixth-largest in volume. Some important facts about Venus:

 

 

Question 6. Describe Our earth and Its characteristics as a member of the solar system.
Answer:

Our earth and Its characteristics as a member of the solar system:

The earth is the only planet in the solar system which has life. Some Important facts about earth:

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Question 7. Describe the planet mars.
Answer:

Planet mars:

The fourth planet from the Sun is called Mars. It is the seventh-largest planet. Some important facts about Mars:

Question 8. Describe and discuss the largest planet in our solar system.
Answer:

The largest planet in our solar system:

The fifth planet from the Sun and the largest in terms of volume is Jupiter. That is why it is also called the King of Planets. This is named after the king of Gods in Roman mythology. Some important facts about Jupiter:

 

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Question 9. Describe the planet Saturn.
Answer:

The planet Saturn:

Saturn is the second-largest planet in terms of volume and the sixth planet from the Sun in our solar system. Some important facts about Saturn:

Question 10. Discuss the planet Uranus.
Answer:

Planet Uranus:

Uranus is the seventh planet from the Sun and the third-largest in terms of volume. This planet was discovered by the British astronomer William Herschel, in the year 1781. Some important facts about Uranus:

Question 11. Give a brief description of the planet Neptune.
Answer:

Planet Neptune:

Neptune is the eighth planet from the Sun and the fourth-largest in terms of volume. This planet was discovered by German astronomer Johann Galle, in the year 1846. Some important facts about Neptune:

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Question 12. What are the differences between planets and stars? Or, Distinguish between stars and planets.
Answer:

The differences between planets and stars are—

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Question 13. Write the differences between the inner and outer planets.
Answer:

The differences between inner and outer planets are—

Question 14. Write the differences between planets and satellites.
Answer:

The differences between planets and satellites are—

Question 15. What are different planets different in colors?
Answer:

When we look at the different planets through a telescope, they all appear to be of different colors. The reasons for this are as follows—

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Question 16. Write the difference between planets and dwarf planets.
Answer:

The differences between planets and dwarf planets are—

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Question 17. What are the special features of mentors?
Answer:

Meteors are small, heavenly bodies – rock or metal – that travel through space and burn up when they enter the Earth’s atmosphere.

They appear suddenly in the night sky and disappear suddenly. They are also called Shooting stars. The special features of the meteors are—

Meteors look like peas from the Earth.

They burn up when they enter the Earth’s atmosphere.

Before burning up completely, they flare brightly and then rush toward the surface of the Earth at tremendous speed.

They fall on the Earth as cold, rocky pieces of matter.

The average speed of a meteor once It enters the earth’s atmosphere is about 75km/second.

Generally, mentors start burning at an altitude of about 130 km above the Earth’s surface and burn out around 95 km above the surface i.e in the Mesosphere.

Meteors can vary in weight from about a few grams to more than a thousand kilograms.

When many meteors enter the Earth’s atmosphere at the same time, it is called a Meteor shower.

When meteors are large in size, they are called Meteorites.

Sometimes, crater-like holes are formed when a meteor hits the Earth. For instance, the hole named Meteor Crater, with a diameter of 1180 meters and a depth of 175 meters in Arizona, USA.

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Question 18 Write the difference between comets and meteors.
Answer:

The Difference between comets and meteors

 

Chapter 1 The Sun The Stars In The Sky Topic B The Solar System Short Analytical type Questions

Question 1. What is the solar system? Who are the members of the solar system?
Answer:

Solar system:

The sun And all the innumerable heavenly bodies that travel around it make up the solar system. These include the planets, their satellites, minor planets, comets as well as asteroids.

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Other members: Other members of the solar system are—

Eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Five dwarf planets: Pluto, Eris, Ceres, Haumea, and Makemake.

Various satellites: Moon of the Earth, Deimos of Mars, Jupiter’s Ganymede, and Titan of Saturn, etc.

Comets: Halley’s, Hale-Bopp, Hyakutake, etc.

Asteroids: Ceres, Eros, etc. 0 Meteors: Leonid (meteor shower), etc.

Question 2. Why we cannot draw the diagram of the solar system accurately?
Answer:

We cannot draw the diagram of the solar system accurately:

We cannot draw the diagram of the solar system accurately. Any diagram that we draw of the solar system is just a rough idea about it, because—

1. The Sun is 1.3 million times larger than the Earth.
2. About 1300 Earth can fit into Jupiter.
3. Mercury is about half of the volume of the Earth.
4. That is why, it is not possible to show the Sun, Jupiter, and Earth in the same diagram maintaining the proportion of their volume and size.

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Question 3. Write a short note on planets.
Answer:

Planets:

Planets, as defined by the International Astronomical Union (IAU) in 2006, are heavenly bodies that fulfill all the following criteria:

1. They do not generate their own light or heat.
2. A planet is illuminated by light from a star.
3. Each of them has its own defined and unique orbit and they revolve around a star.
4. They are spherical in shape.
5. They have cleared the area around their orbits of other heavenly bodies.

Planets are classified into Inner and Outer planets or the Terrestrial planets and the Gas giants.

1. Inner (Terrestrial) planets: Mercury, Venus, Earth, and Mars
2. Outer (Gas giants) planets: Jupiter, Saturn, Uranus, and Neptune.

Question 4. Mention the names of the inner ANd outer planets along with their distances from the sun.
Answer:

Names of the inner and outer planets along with their distances from the sun are—

Question 5. Mention those planets named after greek or roman gods and goddesses.
Answer:

With the exception of earth, all of the planets in our solar system have been named from greek or roman mythology

Question 6. Give a description of the dwarf planet Pluto.
Answer:

Dwarf planet Pluto:

Pluto was discovered by American scientist Clive Tombach on 28 February 1930 and was considered the ninth planet in our solar system till 24 August 2006, when the International Astronomical Union decided to change its classification to that of a dwarf planet.

Pluto is located almost on the edge of the solar system in the Kuiper Belt. Pluto is about 5.9 billion kilometers away from the Sun.

Its diameter is about 2376.6 km and its temperature is about -230°C. This dwarf planet takes 248 years to complete one revolution around the Sun and about 6.4 days to complete one rotation on its axis.

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Question 7. Prepare a table mentioning the names of the planets in the solar system and their main gaseous components.
Answer:

Names of the planets in the solar system and their main gaseous components are—

Question 8. mention The duration of rotation and revolution of each planet in the solar system.
Answer:

The duration of rotation and revolution of each planet in the solar system are—

Question 9 Write a short note on the moon
Answer:

Moon:

The Earth’s nearest neighbor in space is the Moon. The Moon is the Earth’s only natural satellite.

It is at a distance of 384 thousand km from the Earth. Moon’s diameter is about 3475 km. Its surface area is about 37.9 million square km and its average density is about 3.34 gm/cm.

Origin story: The Moon was born about 4.52 billion years ago. American scientists William Hartman and Donald Davis first said that while the Earth was being formed, the ball of gas collided with a huge asteroid, and a part of it broke off.

This broken-off part was the Moon. The Earth’s gravitational force caused the Moon to start revolving around the Earth. This theory is known as ‘The Giant Impact’.

Question 10. Prepare a table of planets, the number of satellites they have, and the names of their important satellites
Answer:

Planets, the number of satellites they have, and the names of their important satellites are-

Question 11. What do you mean by the phases of the moon?
Answer:

Phases of the moon:

The phenomenon of the change in size and shape of the Moon as seen from Earth over the period of a month is called the Phases of the Moon.

From the new moon to the full Moon, the part of the Moon’s lit half that is visible from the Earth slowly increases. Then again, from the full Moon to the new Moon, it decreases. This phenomenon is called the Phases of the Moon.

The 14 days taken to go from a new Moon to a full Moon is called the Waxing of the Moon. During this time, the Moon sets in the sky 48 minutes after the time it set on the previous night.

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The 14 days taken to go from the full Moon to the new Moon is called the Waning. During this time, the Moon rises 48 minutes later than the previous day. On the new Moon day, the Moon is not visible at all.

 

 

Question 12. Describe comets briefly.
Answer:

Comets :

A heavenly body with a bright head and a broomstick-like long tail of gases and dust is called a comet.

It appears suddenly and is usually visible for a short span of time. The word ‘comet’ is derived from the Greek word ‘Komets’ and the Latin word ‘Cometa’ for ‘long hair’.

Structure: A comet has three distinct parts—

1. the head,
2. dust tail
3. gas tail.

The gaseous tail has carbon dioxide, carbon monoxide, ammonia, methane, solid oxygen, hydrogen, nitrogen, and so on.

Origin: After the Big Bang, the mixture of dust particles and gases that remained after the stars and planets were formed, came together to form comets.

Special features: Some special features of comets are—

1. These have hyperbolic and elliptical orbits.
2. They can be periodic or non-periodic.
3. Like planets, they too have orbits around the Sun. As they approach the Sun, the length of their tails increases.
4. They are seen clearly at dawn and dusk.

 

 

Question 13. ‘Earth is the only planet with life/ —Explain why.
Answer:

Earth is the only planet with life:

In terms of distance, the Earth is the third planet from the Sun. The Earth receives just 1/2 billion of the energy generated by the Sun.

This energy from the Sun reaches the Earth every 8 minutes and 20 seconds – this gives us the heat, light, and conditions required to sustain life.

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The average temperature of the Earth is about 15°C and about 71.4% of its volume is water. This water is the other means of sustaining life on Earth.

Because the Earth revolves around its axis once every 24 hours, we have the cycles of day and night. The envelope of air that surrounds the Earth up to a distance of 10,000 km contains oxygen.

Due to the presence of all these conditions, life can exist on Earth.

Question 14. Sometimes mentor showers take place on earth why?
Answer:

Sometimes mentor showers take place on earth:

Meteors are small, rocky pieces of space matter that orbit around the Sun but are not visible because of their size.

When they come too close to the Earth and the Earth’s gravitational force pulls them into the Earth’s atmosphere, then these meteors experience friction with the particles of the Earth’s atmosphere.

This causes them to catch fire and eventually, burn up. Within the atmosphere, they hurtle around at a velocity of almost 10 – 100 km/hour depending on the size.

At around 130 km above the Earth’s surface, they catch fire and by the time they reach the mesosphere – around 95 km above the Earth’s surface, they burn to ash. When dozens of meteors are visible at once, this is called a meteor shower.

Question 15. Though all planets revolve around the Sun at the same time, they do not collide with each other/—why?
Answer:

The Sun is at the exact center of the solar system. Though eight planets and five dwarf planets are in constant revolution around the Sun, they do not collide with each other.

This is because—

1. Different orbit: Each planet revolves around the Sun in its own unique, elliptical orbit and each planet is at a different distance from the Sun.

2. Different revolutionary periods: The revolutionary period of each planet is different and unique.

3. Specific distance: While the massive size of the Sun results in it exerting its centrifugal force on the planets and drawing them towards it, its centripetal force also remains in action.

Thus keeping the planets at specific distances and maintaining their movement in their individual orbits.

WBBSE Class 6 Geography Question Answer

Chapter 1 The Sun The Stars In The Sky Topic B The Solar System Short Answer Type Questions

Question 1. What Is the solar system?
Answer:

Solar system:

The solar system is our Sun and all the innumerable heavenly bodies that travel around it. These include the planets, their satellites, dwarf planets, comets as well as asteroids.

Question 2. How was the Sun formed?
Answer:

Sun formed As Follows:

Scientists believe that the Sun was formed when particles of space, like dust, hydrogen, and helium gas started to compress around a nucleus.

The great gravitational force in this nucleus resulted in a nuclear fusion—which again generated great energy. This energy started radiating as a huge ball of fire—that we know today as the Sun.

Scientists estimate that this happened about 4600 million years ago.

Question 3. What are sunspots?
Answer:

sunspots:

The dark spots visible in the interior of the Sun, when seen with a powerful telescope, are called sunspots. These are actually huge holes that are the result of the nuclear fusion continuously occurring in the interior of the Sun.

As these holes are cooler than the rest of the Sun, they appear darker.

Question 4. Why should we not look at the Sun with our naked eyes?
Answer:

Along with heat and light, the Sun also emits radiation that is harmful to human beings.

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These rays can cause considerable damage to the retina of the eye. It can cause partial or even complete blindness. So, we must never look at the Sun with the naked eye.

Question 5. Which are the terrestrial planets?
Answer:

Terrestrial planets:

Mercury, Venus, and Mars are smaller and much like the Earth in size. That is why, these plants are called terrestrial planets.

Question 6. Three more planets in the solar system, besides Saturn, have rings. Can you name them?
Answer:

Three more planets in the solar system, besides Saturn, have rings

In the solar system, besides Saturn Jupiter, Uranus, and Neptune have rings.

Question 7. What exactly are the rings of Saturn?
Answer:

Rings of Saturn:

In 1655, the scientist Huygens first saw a revolving, disc-shaped system encircling Saturn.

These were later observed to be ring-like formations of ice, dust particles, asteroids, meteors, and other space materials. The rings of Saturn remain one of the mysteries of our universe.

The spacecraft Cassini is at work collecting and sending more information about these rings to Earth. Almost 7 major and 320 minor rings are encircling Saturn.

Question 8. Mercury is the planet closest to the Sun, Venus is brighter/—why?
Answer:

Mercury is the planet closest to the Sun, Venus is brighter:

According to the principles of reflection of light, the larger the object, the higher its reflection power. Venus is three times the size of Mercury, so the amount of the Sun’s light it reflects is greater.

Venus is covered in clouds and has a smooth surface while Mercury is rough. As a result, following the principles of reflection of light, it reflects more light. Also, Venus is closer to the Earth and so, it appears brighter to us.

Question 9 Why is Venus called the Earth’s twin?
Answer:

Venus called the Earth’s twin:

As Venus is almost equal to the Earth in both volume and density, it is called Earth’s twin planet or sister planet.

Question 10. Name the nearest and the farthest planets
Answer:

The nearest and the farthest planets

The planet nearest to the Sun is Mercury and the farthest is Neptune.

Question 11. What is a dwarf planet?
Answer:

Dwarf planet:

A dwarf planet is a heavenly body that has a defined orbit around the Sun, and has enough gravity to be nearly spherical but unlike planets, has not yet cleared its orbit of other celestial objects.

As an example, Pluto has been declared to be a dwarf planet by astronomers in 2006.

Question 12. What is a satellite?
Answer:

Satellite:

A satellite is a small, heavenly body that orbits around a planet. It does not produce any heat or energy on its own. A satellite is illuminated and heated by the Sun.

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Example: The moon is the satellite of the Earth; Deimos and Phobos are satellites of Mars.

Question 13. What are moonshots?
Answer:

Moonshots:

The dark patches visible on the Moon are called moonshots. In reality, these are small mountains, extensive depressions, mouths, and craters of ancient volcanoes, and so on.

Since the moon does not generate its own light and the Sun’s light does not reach these parts, they look like black patches on the Moon’s surface.

Question 14. What is a lunar month?
Answer:

Lunar month:

The length of time from one full moon to the next or one new moon to the next is called a lunar month. The moon takes 27 days 7 hours 43 minutes and 11.47 seconds to complete one revolution around the Earth.

Due to minor orbital variations, sometimes, it takes the moon a little more time to come back to the same position (29 days 12 hours 44 minutes 38.4 seconds).

Question 15. There would be no life on Earth without the Sun/—Explain why.
Answer:

There would be no life on Earth without the Sun:

The Sun is the only source of heat and light for our Earth. The Sun is at a distance of 150 million kilometers from the Earth.

As a result, the Sun’s light is not so blinding here. The Earth receives just 1 part of the 2 billion parts of heat that the Sun generates.

As a result of this heat, the Earth has living organisms like plants, animals, and human beings. If the Sun stops producing energy, all life on Earth as we know will die.

Question 16. What are asteroids?
Answer:

Asteroids:

Small, airless, rocky bodies that revolve around the Sun in their own specific orbits but are too small to be called planets are called asteroids.

A large number of these, ranging in size from as small as a grain of sand to as big as half of the moon, are found orbiting between Mars and Jupiter. Example: The asteroid belt between Mars and Jupiter, Trojans, etc.

Question 17. By the definition of earth day and earth year which planet has a longer day than a year?
Answer:

Venus takes 243 Earth days to complete one rotation on its axis—so, one day on Venus is equal to 243 Earth days. Venus takes 225 days to complete one revolution around the Sun – that is, a year on Venus is 225 days.

Thus, on Venus, a ‘day’ is longer than a ‘year’.

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Question 18. Stars twinkle but planets do not/—Why?
Answer:

Stars twinkle but planets do not:

The stars are at a great distance from the Earth. Their light travels a great distance to reach us. While traveling through space, particles of light collide with the particles of space and get deflected.

Question 19. ‘We Always see only one face of the moon from earth.’-Explain this statement.
Answer:

We Always see only one face of the moon from earth:

As a result, their light seems to blink or twinkle. On the other hand, planets never emit their own light.

They receive their light from Sun and this light has to travel a much lesser distance to reach us. As a result, the planets do not twinkle.

The Earth is much larger than the Moon (the Earth’s volume is 5,101 million cubic km, while that of the Moon is 379 million cubic km) The Moon not only revolves around the Earth, it also rotates around its axis.

The Moon takes 27 days 7 hours 43 minutes to rotate on its own axis and takes the same time to complete one revolution around the Earth. Since both of these are equal, we always get to see just one face of the Moon.

 

Chapter 1 The Sun The Stars In The Sky Topic B The Solar System Multiple Choice Questions

Question 1. The estimated age of the Sun is—

1. 2.5 billion years
2. 1.6 billion years
3. 4.5 billion years

Answer: 3. 4.5 billion years

Question 2. The Sun is a million times larger than the Earth.

1. 1
2. 1.8
3. 1.3

Answer: 3. 1.8

Question 3. The temperature inside the Sun is about—

1. 15 million°C
2. 50 million°C
3. 100 million°C

Answer: 1. 50 million°C

Question 4. Solar storms flare up every—

1. 21 years
2. 11 years
3. 5 years

Answer: 2. 11 years

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Question 5. The number of dwarf planets in the solar system is—

1. 2
2. 5
3. 4

Answer: 2. 5

Question 6. The number of inner planets in the solar system is—

1. 6
2. 4
3. 5

Answer: 2. 4

Question 7. From the Earth, it seems that—

1. the Moon is smaller than the Sun
2. the Sun and the Moon are of the same size
3. the Sun is smaller than the Moon

Answer: 2. the Sun and the Moon are of the same size

Question 8. The planet nearest to the Sun is—

1. Mercury
2. Venus
3. Mars

Answer: 1. Mercury

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Question 9. The bright heavenly body that can be seen in the western sky after sunset is—

1. Mercury
2. Venus
3. Pole Star

Answer: 2. Venus

Question 10. Venus rotates around its axis.

1. clockwise
2. anticlockwise
3. undefined

Answer: 1. clockwise

Question 11. The hottest planet in our solar system is—

1. Venus
2. Mars
3. Uranus

Answer: 1. Venus

Question 12. The high iron oxide content on the surface of Mars makes it appear—

1. reddish in colour
2. brownish in colour
3. blackish in colour

Answer: 1. reddish in colour

Question 13. The planet that takes the least time to rotate around its axis is—

1. Neptune
2. Saturn
3. Jupiter

Answer: 3. Jupiter

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Question 14. The volume of Jupiter is times the volume of the Earth.

1. 1500
2. 1000
3. 1300

Answer: 3. 1300

Question 15. The largest planet in the solar system is—

1. Earth
2. Jupiter
3. Uranus

Answer: 2. Jupiter

Question 16. The coldest planet in our solar system is—

1. Jupiter
2. Mars
3. Uranus

Answer: 3. Uranus

Question 17. Uranus’s high methane content makes it appear—

1. red in colour
2. blue in colour
3. green in colour

Answer: 3. green in colour

Question 18. The planet that takes the most time to complete one revolution around the Sun is—

1. Neptune
2. Saturn
3. Uranus

Answer: 1. Neptune

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Question 19. One revolution of the Moon around the Earth takes—

1. 24 hours
2. 27 days 8 hours
3. 365 days

Answer: 2. 27 days 8 hours

Question 20. The distance of the Moon from the Earth is—

1. almost 149.5 million km
2. 100 million km
3. 0.384 million km

Answer: 3. almost 149.5 million km

Chapter 1 The Sun The Stars In The Sky Topic B The Solar System Fill In The Blanks

Question 1. The Sun is _________ million times heavier than the Earth.
Answer: 0.3

Question 2. Jupiter, Saturn, Uranus, and Neptune are _________ planets.
Answer: Gaseous

Question 3. The nearest planet to the Sun which does_________ not have any satellite is
Answer: Mercury

Question 4. The fastest-revolving planet in the solar system is _________
Answer: Mercury

Question 5. The brightest planet in the solar system is _________
Answer: Venus

Question 6. The planet nearest to the Earth is_________
Answer: Venus

Question 7. A year on Venus is equal to_________ days
Answer: 225

Question 8. Mars takes _________ days to complete one for light from the Moon to revolution around the Sun.
Answer: 687

Question 9. _________ is the planet with the largest number of satellites.
Answer: Jupiter

Question 10. It takes each the Earth.
Answer: 1.3 Seconds

Question 11. The Moon was formed about_________ billion years ago.
Answer: 4.52

Question 12. Change in the Moon’s size and shape from full moon to new moon is called _________
Answer: Phases of the moon

Question 13. Miranda and Titania are satellites of _________
Answer: Uranus

Question 14. The largest satellite in the solar system is _________
Answer: Titan

Question 15. Ceres and vesta are _________
Answer: Asteroids

Question 16. There are about_________ asteroids Between mars and Jupiter.
Answer: 40,000

Question 17. _________ is the largest planetoid in the solar system.
Answer: Ceres

Question 18. Halley’s Comet is visible from the Earth at an interval of _________ years.
Answer: 76

Chapter 1 The Sun The Stars In The Sky Topic B The Solar System Fill In The Blanks

Question 1. The planet nearest to the Sun is Venus.
Answer: False

Question 2. The part of the solar system around Pluto is called the ‘Kuiper Belt’.
Answer: True

Question 3. The moon is the source of heat for planets.
Answer: False

Question 4. Venus does not have any satellites.
Answer: True

Question 5. Venus is called the twin planet of the Earth.
Answer: True

Question 6. Halley’s Comet was last seen in 1996.
Answer: False

Question 7. The gravitational force of the moon is much less than that of the Earth.
Answer: True

Question 8. Pluto is a planet.
Answer: False

Question 9. The moon has its own light.
Answer: False

Question 10. A lunar eclipse always occurs at a full moon.
Answer: True

Question 11. A person will weigh 6 times more on the moon than on the Earth.
Answer: False

Question 12. A lunar eclipse does not occur on every new moon as the Sun, the moon and the Earth are not in a straight line every time.
Answer: True

Question 13. A celestial body with a long, bright tail is called a comet.
Answer: True

Chapter 1 The Sun The Stars In The Sky Topic B The Solar System Match The Columns

Answer:1-E,2-F,3-D,4-B,5-C,6-A

Chapter 1 The Sun The Stars In The Sky Topic B The Solar System Answer In One Or Two Words

Question 1. What Is the name of the outer surface of the Sun?
Answer: Corona.

Question 2. Which gas is the predominant constituent of the Sun?
Answer: Hydrogen.

Question 3. What is the name of the main heavenly object in the solar system?
Answer: The Sun.

Question 4. How does the Sun’s light appear from Earth?
Answer: Steady.

Question 5. By what other names is Venus called?
Answer: The Morning Star and the Evening Star (though Venus is not a star).

Question 6. What is the color of the Earth when it is seen from space?
Answer: Blue.

Question 7. Which is the largest inner planet in the solar system?
Answer: Earth.

Question 8. What would happen to the Earth if the Sun was not there?
Answer: There would be no day or night and there would be no life on Earth.

Question 9. What is another name for Mars?
Answer: The Red Planet.

Question 10. Which planet has the most satellites?
Answer: Jupiter.

Question 11. Which planet is called the ‘king of planets’?
Answer: Jupiter.

Question 12. Which planet is called ‘the green planet’?
Answer: Uranus.

Question 13. Which is the smallest outer planet in the solar system?
Answer: Neptune.

Question 14. Which is the largest dwarf planet in the solar system?
Answer: Pluto.

Question 15. How much bigger is the Earth than the moon?
Answer: 50 times by volume and 4 times by area.

Question 16. What is Jupiter’s largest satellite named?
Answer: Ganymede.

Question 17. When will Halley’s Comet be sighted from the Earth again?
Answer: In 2061 (according to the information given by solarsystem.nasa.gov).

Question 18. Which instrument is used to measure the Sun’s angle of elevation?
Answer: Sextant.