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Ncert Exemplar Solutions Class 8 Science Stars and Solar System
Welcome to NCTB Solutions. Here with this post we are going to help 8th class students for the Solutions of NCERT Exemplar Class 8 Science Book, Unit 17, Stars and Solar System. Here students can easily find step by step solutions of all the problems for Stars and Solar System, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.
Stars and Solar System all Question Solutions :
Multiple Choice Questions :
Question no – (1)
Morning star is the name given to
Answer :
The correct answer is option – (d)
Morning star is the name given to planet Venus.
Question no – (2)
Which of the following figures depicts the position of pole star correctly?
Answer :
The appropriate answer is option – (a)
Figure – (A) depicts the position of pole star correctly.
Question no – (3)
Sun appears to move from east to west around the earth. This means that earth rotates from
Answer :
The correct option is – (b)
This means that earth rotates from west to east.
Question no – (4)
An astronaut standing on the surface of the moon throws a ball upwards. The ball would
Answer :
The answer is alternative – (c)
The ball would go up and then come back to the surface of the moon.
Question no – (5)
Suppose a new planet is discovered between Uranus and Neptune. Its time period would be
Answer :
The appropriate answer is option – (a)
Its time period would be less than that of Neptune.
Question no – (6)
The change in seasons on the earth occurs because
Answer :
The answer is option – (d)
The change in seasons on the earth occurs because the axis of rotation of the earth is tilted with respect to the plane of its orbit.
Question no – (7)
The first of a month is the new moon day. On fifteenth of the same month, which of the following figures would represent the phase of the moon?
Answer :
The correct answer is alternative – (a)
The figure – (A) represent the phase of the moon.
Very Short Answer Questions :
Question no – (8)
Answer :
No, stars emit light at day time too but do don’t see them because of the bright light of the sun.
Question no – (9)
Answer :
Boojho is absolutely correct because stars are the only celestial body that twinkles but planets don’t.
Question no – (10)
Answer :
(a) The planet nearest to us is Jupiter
This statement is False.
Correct Statement : The planet nearest to us Venus and Mars.
(b) All the stars are at the same distance from us
This statement is False.
Correct statement : All the stars are at different distance from us.
(c) The planets do not emit light of their own
This statement is True.
(d) The planets keep changing their position with respect to stars
This statement is True.
(e) The planet Venus appears in the eastern sky before sunrise –
This statement is True.
(f) The plane in which the earth revolves around the sun is called equatorial plane of earth
This statement is False.
Correct statement : The Earth revolves around the Sun in orbital plane of earth.
Question no – (11)
Answer :
It will take somewhere around 29 days that is the 30th day for John to see the full moon again. It is the time duration for moon to change its phases from full moon to new moon and back to full moon and so for new moon to full moon and back to new moeart.
Question no – (13)
Answer :
The sun will be at position C of the given figure considering that in the left side of C sunlight is falling on earth.
Short Answer Questions :
Question no – (15)
Answer :
A light year is basically the distance a light travels in one year in space. Since the sun is 10 light years away from us so if it suddenly brighten ups today it will take exact 10 years for its light to reach us.
Question no – (16)
Answer :
Meteors are small objects that glows when they enter the earth’s but this glow is nothing when we compare it to the brightness of sun during day time. So it often happens that we are not able to see meteors during daytime.
Question no – (17)
Answer :
A moon does not produce it’s own light as well as it rotates around the earth. So it often happens that earth’s shadow falls on the moon and the parts of moon that are spared from earth shadow reflects the sunlight falling on it back to us. This is the reason why we see different shapes of moon at different time.
Question no – (18)
Answer :
No, Paheli would not be able to see the moon at the same position because moon like as we know revolves around the earth thus changing its position as time passes by.
Long Answer Questions :
Question no – (19)
Answer :
No, if moon began to emit light of its own then we would be unable to see phases of moon again. Since now it is emitting light it won’t matter that what is the position of the moon in respect to us. Wherever it will be we would be able to see on side of the moon always as it is having light of its own.
Question no – (20)
Answer :
The tail of comet at position B will be the longest as it is very close to the sun.
Question no – (21)
Answer :
We only see one side of the moon because the time taken by the moon to rotate on its axis as well as the time taken by it to revolve around the earth is very much similar.
Question no – (22)
Answer :
(a) We would see the full moon in the left side of the sky
(b) We would see the crescent moon on the right side of the sky.
Question no – (23)
Answer :
All the planets in this figure are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
Question no – (24)
Answer :
If the distance between the sun and the earth is halved. The life on earth will cease to exist. The temperature on the earth will keep on increasing to that much extent that water will start to evaporate at a high speed and living organisms can’t bear this much of heat. Our protective shield the ozone layer of the earth will be destroyed by intense heat of sun.
Other Chapter Solutions :
👉 Crop Production and Management
👉 Microorganisms : Friend and Foe
👉 Synthetic Fibres and Plastics
👉 Materials : Metals and Non-Metals
👉 Conservation of Plants and Animals
👉 Cell-Structure and Functions
👉 Reaching the Age of Adolescence
👉 Force
👉 Friction
👉 Sound
👉 Chemical Effects of Electric Current
👉 Light
