NCERT Solutions - Science , Class 8 solutions for Chapter 17 Stars and the Solar System

Which of the following is NOT a member of the solar system?

(a) An asteroid

(b) A satellite

(c) A constellation

(d) A comet

Q 1) Which of the following is NOT a member of the solar system?

(a) An asteroid (b) A satellite

(c) A constellation (d) A comet

Morning star is the name given to

(a) pole star

(b) star Sirius

(c) planet Jupiter

(d) planet Venus

Which of the following is NOT a planet of the sun?

(a) Sirius

(b) Mercury

(c) Saturn

(d) Earth

Which of the following figures depicts the position of pole star correctly?

q 2) Which of the following is NOT a planet of the sun?

(a) Sirius (b) Mercury

(c) Saturn (d) Earth

Sun appears to move from east to west around the earth. This means that earth rotates from

(a) east to west

(b) west to east

(c) north to south

(d) west to north

Q 3) Phases of the moon occur because

(a) we can see only that part of the moon which reflects light towards us.

(b) our distance from the moon keeps changing.

(c) the shadow of the Earth covers only a part of the moon’s surface.

(d) the thickness of the moon’s atmosphere is not constant.

Phases of the moon occur because

(a) we can see only that part of the moon which reflects light towards us.

(b) our distance from the moon keeps changing.

(c) the shadow of the Earth covers only a part of the moon’s surface.

(d) the thickness of the moon’s atmosphere is not constant.

Q 4) Fill in the blanks.

(a) The planet which is farthest from the Sun is ____________ .

(b) The planet which appears reddish in colour is ____________ .

(c) A group of stars that appear to form a pattern in the sky is known as a ____________ .

(d) A celestial body that revolves around a planet is known as __________.

(e) Shooting stars are actually not ____________.

(f) Asteroids are found between the orbits of _________ and _________ .

An astronaut standing on the surface of the moon throws a ball upwards. The ball would

(a) directly fall down from the point it is released.

(b) hang in space.

(c) go up and then come back to the surface of the moon.

(d) keep going up never to come back.

Fill in the blanks.

(a) The planet which is farthest from the Sun is ____________ .

(b) The planet which appears reddish in colour is ____________ .

(c) A group of stars that appear to form a pattern in the sky is known as a ____________ .

(d) A celestial body that revolves around a planet is known as __________.

(e) Shooting stars are actually not ____________.

(f) Asteroids are found between the orbits of _________ and _________ .

Q 5) Mark the following statements as true (T) or false (F).

(a) Pole star is a member of the solar system. ( )

(b) Mercury is the smallest planet of the solar system. ( )

(c) Uranus is the farthest planet in the solar system. ( )

(d) INSAT is an artificial satellite. ( )

(e) There are nine planets in the solar system. ( )

(f) Constellation Orion can be seen only with a telescope. ( )

Mark the following statements as true (T) or false (F).

(a) Pole star is a member of the solar system. ( )

(b) Mercury is the smallest planet of the solar system. ( )

(c) Uranus is the farthest planet in the solar system. ( )

(d) INSAT is an artificial satellite. ( )

(e) There are nine planets in the solar system. ( )

(f) Constellation Orion can be seen only with a telescope. ( )

Suppose a new planet is discovered between Uranus and Neptune. Its time period would be

(a) less than that of Neptune.

(b) more than that of Neptune.

(c) equal to that of Neptune or Uranus.

(d) less than that of Uranus.

Q 6) Match items in column A with one or more items in column B.

A	B
(i) Inner planets	(a) Saturn
(ii) Outer planets	(b) Pole star
(iii) Constellation	(c) Great Bear
(iv) Satellite of the Earth	(d) Moon
	(e) Earth
	(f) Orion
	(g) Mars

Match items in column A with one or more items in column B.

The change in seasons on the earth occurs because

(a) the distance between the earth and the sun is not constant.

(b) the axis of rotation of the earth is parallel to the plane of its orbit.

(c) the axis of rotation of the earth is perpendicular to the plane of its orbit.

(d) the axis of rotation of the earth is tilted with respect to the plane of its orbit.

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?

In which part of the sky can you find Venus if it is visible as an evening star?

Q 7) In which part of the sky can you find Venus if it is visible as an evening star?

Do stars emit light only during night?

Q 8) Name the largest planet of the solar system.

Name the largest planet of the solar system.

What is a constellation? Name any two constellations.

Paheli and Boojho observe a bright object in the night sky which was not twinkling. Paheli says, it is a star and Boojho says it is a planet. Who is correct?

Q 9) What is a constellation? Name any two constellations.

State whether the following statements are ‘True’ or ‘False’.

(a) The planet nearest to us is Jupiter.

(b) All the stars are at the same distance from us.

(c) The planets do not emit light of their own.

(d) The planets keep changing their position with respect to stars.

(e) The planet Venus appears in the eastern sky before sunrise.

(f) The plane in which the earth revolves around the sun is called equatorial plane of earth.

Draw sketches to show the relative positions of prominent stars in (a) Ursa Major and (b) Orion

Q 10) Draw sketches to show the relative positions of prominent stars in

(a) Ursa Major and (b) Orion

Q 11)Name two objects other than planets which are members of the solar system.

Name two objects other than planets which are members of the solar system.

John saw the full moon on a particular day. After how many days will he be able to see the full moon again?

Q 12) Explain how you can locate the Pole Star with the help of Ursa Major.

Explain how you can locate the Pole Star with the help of Ursa Major.

In the picture of rotating earth given as Fig. mark the position of pole star.

the

Q 13) Do all the stars in the sky move? Explain.

Do all the stars in the sky move? Explain.

In the given Fig. out of the positions A, B, C, and D which will indicate the position of the sun? Draw the sun at the appropriate position.

In Fig. mark the arrows (←), (→), (↓), or (↑) to show the direction of sunlight

Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light-years away from the Earth?

Q 14) Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light years away from the Earth?

The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accommodate?

A star is ten light-years away from the earth. Suppose it brightens up suddenly today. After how much time shall we see this change?

Q 15) The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accomodate?

Boojho made the following sketch (Fig. 17.29) of the solar system. Is the sketch correct? If not, correct it.

Q 16) Boojho made the following sketch (Fig. 17.29) of the solar system. Is the sketch correct? If not, correct it.

Meteors are not visible during the daytime. Explain the reason.

Why does the moon change its shape daily?

Paheli saw the moon through a glass window at 8:00 p.m. She marked the position of the moon on the glass pane. She got up at 4 a.m. in the morning. Will the moon be visible in the same position?

Suppose the moon emits light of its own. Would it still have phases? Justify your answer

Fig. shows comets without their tail. Show the tails of the comets at positions A, B, and C. In which position will the tail be longest?

Look at Fig. carefully and answer the following question:

(a) In which part of the sky would you see the full moon in the evening?

(b) In which part of the sky would you see the crescent moon in the evening?

Write the names of all planets in Fig.

Suppose the distance between earth and sun becomes half of its present distance. What is likely to happen to live?

Explain with a diagram of how you can locate pole star with the help of the constellation Great Bear (Ursa Major).

Ncert solutions science class 8 Solutions for Chapter 17 stars and the solar system