Class 6 Science Chapter 12 Extra Questions Beyond Earth
Class 6 Science Chapter 12 Beyond Earth Important Extra Questions and Answers
Beyond Earth Class 6 Extra Questions Very Short Answer Type
Question 1.
Name the star( after the sun) which is closest to the earth.
Answer:
Alpha Centauri
Question 2.
Name two planets which are between the sun and the earth.
Answer:
Mercury and Vehus
Question 3.
Constellation having 7 prominent stars is visible during the winter. Name the constellation.
Answer:
Orion
Question 4.
Which two planets have asteroids between them?
Answer:
Mars and Jupiter
Question 5.
Name the planet where there is no carbon dioxide.
Answer:
Mars
Question 6.
What is number of prominent starts in the ‘Orion’?
Answer:
Seven
Question 7.
Which is the smallest planet of the solar system?
Answer:
Mercury
Question 8.
Which planet in the solar system is nearest to the earth?
Answer:
Venus
Question 9.
Name the planet farthest from the earth.
Answer:
Pluto
Question 10.
What are the two most common shapes of galaxies?
Answer:
Elliptical and Spiral
Beyond Earth Class 6 Extra Questions Short Answer Type
Question 1.
Distinguish between a star and a planet.
Answer:
Star
- A star has its own light.
- A star twinkles at night.
Planet
- Planet has no light of its own.
- A planet reflects sunlight. It does not twinkle at all.
Question 2.
Write two difference between a galaxy and a constellation.
Answer:
Galaxy
- A galaxy is a huge cluster of stars containing billion of stars.
- A galaxy does not form a pattern resembling the shape of an animal or a human being.
Constellation
- A constellation is a closed group of only a few stars.
- A constellation appears to resemble an animal or a human being in shape.
Question 3.
What is a comet? Name the periodic comet that appeared in 1986 after a period of 76 years.
Answer:
Comet is a small body of eyes and dust that revolves around the sun in highly elliptical orbit. Halley’s comet appeared in 1986.
Question 4.
Which of the life supporting conditions do not exist on the planet ‘Venus’?
Answer:
- Venus does not have water.
- Venus does not have the right temperature range. It is too hot to support even the primitive forms of life.
Question 5.
(a) In which direction do stars appear to move in the sky?
(b) Why do they appear to move in this direction?
Answer:
(a) The stars appear to move in the sky east to west direction.
(b) This is due to the rotation of earth from west to east direction on its axis.
Question 6.
What makes the earth a spherical planet for the life to flourish on it?
Ansnswer:
Presence of right temperature range, presence of water and presence of a protective blanket of ozone around the earth makes the Earth a special planet for the life to flourish on it.
Question 7.
Why stars are not visible during the day?
Answer:
Since stars are far away from us compared to the sun, so the glare of the sun is much more than the glare of star during day time. Hence, stars are not visible during the day.
Question 8.
All stars except the pole star appears to move from east to west. Give reasons.
Answer:
The Earth rotates on its Axis from west to east due to which the stars appears to move in the opposite direction, from east to west. The pole star appears to be stationary because it lies on the axis of rotation of earth which is fixed in space and does not change with time.
Question 9.
We never see the back side of the Moon from the Earth, why?
Answer:
We never see the back side of the Moon from the Earth because the Moon rotates about its axis in about the same time that it takes to orbit the Earth. This results in the same phase turned towards the earth at all times.
Question 10.
How you can locate the polyester with the help of Ursa Major?
Answer:
Pole star is situated at the end of the Ursa Major, It is a straight line starting from the last two stars is extended towards the north direction, it will lead to the pole star.
Question 11.
The moon does not produce its own light even then we are able to see it shining in the night sky. Why?
Answer:
We are able to see the moon because of sunlight falling on the Moon gets reflected towards the earth. When the sunlight falls on the Moon, then a part of the sunlight is reflected by the surface of moon towards the earth. Where this reflected sunlight enters our eyes on the earth to us it appears as if the light is coming from Moon itself.
Question 12.
Venus, Mars and Jupiter can be seen in the night sky. How will you identify these planet?
Answer:
Venus is a brightest of all the planets in the sky. Venus appears in the eastern sky before sunrise.
Mars appears reddish in the sky. Jupiter is as bright as Venus. It rises in the east and sets in the west in the early morning. It can be seen throughout the night.
Question 13.
What is sun? Name the next nearest star. What is the distance of Sun from the Earth?
Answer:
The sun is the nearest star to the earth. Sun is the head of the solar system. The next nearest star is Alpha centuari. The sun is nearly 150 million kilometre away from the Earth.
Question 14.
Describe the following:
(a) Full Moon
(b) New Moon
(c) Crescent Moon
Answer:
(a) Full Moon : when rays from the sun fall directly on the moon It is seen as the full disc of light. This is called full moon.
(b) New Moon : When the Earth and the Sun are on opposite sides of the Moon, the portion of the Moon which faces the earth is dark. As a result, we cannot see the moon. The moon in this position is called New Moon.
(c) Crescent Moon : When only a part of the moon is illuminated by the sunlight, the part towards the earth is visible. In these positions, the moon is called crescent moon.
Question 15.
Identify me:
(a) Small irregular shaped Rocky bodies orbiting the sun
(b) An object of eyes and dust mostly orbiting the sun
(c) Definite patterns of star seen from the Earth
Answer:
(a) Asteroids
(b) Comet
(c) Constellation
Question 16.
What are Gas planets or Jovian planets? Describe.
Answer:
Jupiter, Saturn, Uranus and Neptune which are composed of gas are called Gas or Jovian planet. They are primarily made up of Hydrogen and Heium gases. These planets have low densities, rapid rotation, deep atmospheres, rings and many natural satellites (moon).
Question 17.
Describe Jupiter planet.
Answer:
Jupiter is a fifth planet from the sun. Jupiter is the largest planet of the solar system. It is not solid like the inner four planets and is made of gases. It has a ring system. Jupiter has an atmosphere made up of hydrogen gas. Winds with every high speed blow over it, infact the Red Spot on the planet is believed to be a storm that has been raging for hundreds of years. It is easily visible from the earth. It has 64 moons, four of which can be seen from the Earth through a light telescope.
Question 18.
Describe Saturn.
Answer:
It is a second largest planet of the solar system. It has a very complex ring system. The rings are composed of eyes and rock particles. It has 62 moons. It is visible from the Earth.
Question 19.
Describe Uranus.
Answer:
It has fewer rings. It is unique in that its axis of rotation is inclined at 97 degree. This means it rotates almost on its sides. Uranus has 27 moons. Hydrogen and Methane gases have been detected in the atmosphere of Uranus. Its diameter is less than half of that of the earth.
Question 20.
Describe Neptune.
Answer:
It is a third most massive gas planet in the solar system. It is about the same size as Uranus. It has a ring system and 13 moons. It has 8 moons. We need a telescope to see Neptune in the night sky.
Question 21.
State the conditions which are essential for life to originate and flourish on a planet.
Answer:
- The planet should have right temperature range so as to permit life sustaining chemical reactions.
- The planet should have a liquid medium like water to transport nutrients.
Beyond Earth Class 6 Extra Questions Long Answer Type
Question 1.
State the difference between a star and a planet.
Answer:
Star
- A star has its own light. It is self luminous
- A start twinkles at night.
- Stars are very big in size.
- Stars do not change their relative positions in the sky.
- Stars are countless in number.
Planet
- A planet has no light of its own. It shines because it reflect so light received from the Sun.
- A planet does not twinkle at all.
- Planets are very small in size as compared to stars.
- The planets revolve around the star, i.e. the sun.
- There are only eight planets
Question 2.
Describe characteristics of the moon.
Answer:
Characteristics of the moon:
- Distance of the Moon from the Earth history 84,400 kms.
- Time taken by the moon to complete one revolution around the earth is 27 days 8 hours (27.3 days).
- Moon’s diameter is about 3,475 km (a little more than one fourth of the earth’s size)
- Moon surface is made up of mountains and crators. There are many steep and high mountains on the surface of the Moon.
- The moon has no air and hence, no atmosphere.
Question 3.
Describe Dwarf planets.
Answer:
A dwarf planet is nearly round but does not have a strong gravitational force. The three dwarf planets are Ceres, Pluto and Eris. They are extremely cold planets. Pluto, the largest known dwarf planet in the solar system has one moon. It takes nearly 248 years to complete one revolution around the sun. Ceres is the smallest dwarf planet in the solar system. Eris has one moon. Its distance from the sun is roughly three times that of Pluto.
Question 4.
Describe Asteroids.
Answer:
Asteroids are small irregular shaped rocky bodies orbiting the sun. There are millions of asteroids in the solar system. The surface of the asteroids is full of craters indicating impact from meteorits. They have located mostly between Mars and Jupiter. The number of asteroids between Mars and Jupiter is so large that they appear as a belt in this region.
Question 5.
Describe Comets.
Answer:
Comets are balls of ice and dust. They orbit around the sun in highly elliptical orbits. The orbits of some of the comets take them beyond the solar system. Hence, they make periodic appearance in the sky.
The head of comet is made up of heavy particles and is attracted towards the sun. The tail mainly consists of dust and gases. The tail of the comet always points away from the sun. The tail becomes longer as the comet comes closer to the Sun.
Beyond Earth Class 6 Picture Based Questions
I. Observe the above diagram and answer the following questions:
Question 1.
What does the figure represent?
(a) Solar system
(b) Galaxy
(c) Planets
(d) Sun
Answer:
(a) Solar system
Question 2.
Name the biggest planet of solar system.
(a) Venus
(b) Uranus
(c) Jupiter
(d) Mars
Answer:
(c) Jupiter
Question 3.
Name the closest planet to the sun.
(a) Earth
(b) Mercury
(c) Jupiter
(d) Mars
Answer:
(b) Mercury
Question 4.
Name two planets which are between the sun and the earth.
Answer:
Mercury and Venus
Question 5.
What does the solar system consist of?
Answer:
Solar system consist of the Sun, The 8 planets and their satellites, and millions of smaller celestial object such as asteroids, comets and meteoroids.
II. Observe the figure and answer the following questions :
Question 1.
What does the figure show?
(a) Rising sun
(b) Morning time
(c) Set sun
(d) None of these
Answer:
(a) Rising sun
Question 2.
Name.the nearest star to the earth.
(a) Sirius
(b) Pole star
(c) Orion
(d) Sun
Answer:
(d) Sun
Question 3.
Which gas is responsible for tremendous amount of energy that the sun radiates?
(a) Hydrogen
(b) Oxygen
(c) Nitrogen
(d) Helium
Answer:
(a) Hydrogen
Question 4.
How big is the sun?
Answer:
It is about hundred times bigger than the earth in diameter. Its diameter is 14 into 105 kilometres.
Question 5.
Why do we classify the sun as a star?
Answer:
The sun is a star because it has its own sources of energy and continuously emits heat and light.
Beyond Earth Class 6 Case Based Questions
I. The constellation Orion is often represented as a hunter. There are three stars in the middle which represent the belt of the hunter. Some people imagine that the hunter Orion followed by his dog ( constellation Canis Major) is battirg g bull (Constellation Taurus). Canis major contains a star called Sirius, which is a brightest star in the night sky.
Question 1.
Which of the following is the name of constellation?
(a) Ursa Major
(b) Orion
(c) Both (a) and (b)
(d) None of these
Answer:
(c) Both (a) and (b)
Question 2.
A constellation having seven prominent stars is visible during the winter. Name the constellation.
(a) Orion
(b) Ursa Major
(c) Sirius
(d) None of these
Answer:
(a) Orion
Question 3.
What is constellation?
Answer:
The stars that appear in the form of close groups and form recognisable shapes and patterns are called constellations.
Question 4.
Where constellation Orion is visible?
Answer:
Orion is visible in the Northern sky in the late evening during winter.
Question 5.
Why Orion Constellation is called Hunter?
Answer:
It looks like a hunter, so it is called hunter.
II. A planet is a large nearly spherical object that revolves around the sun. Our Earth is a planet as it revolves around the Sun. The Earth takes nearly one year to complete one revolution. Like the Earth there are other planets that revolve around the sun.
Question 1.
Name the planet where there is no carbon dioxide?
(a) Earth
(b) Jupiter
(c) Mars
(d) Mercury
Answer:
(c) Mars
Question 2.
Which planet of the solar system is the hottest?
(a) Venus
(b) Jupiter
(c) Mars
(d) Mercury
Answer:
(d) Mercury
Question 3.
Which planet in the solar system is nearest to the earth?
(a) Venus
(b) Earth
(c) Mars
(d) Mercury
Answer:
(a) Venus
Question 4.
What are planets?
Answer:
The solid heavenly bodies which revolve around the sun are called planets.