Exercise NCERT Book

Que: Choose the correct answer in Questions 1-3 : 

Q1. Which of the following is NOT a member of the solar system?

(a) An asteroid

(b) A satellite

(c) A constellation

(d) A comet

Ans: (c) A constellation|

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

(a) Sirius

(b) Mercury

(c) Saturn

(d) Earth

Ans: (a) Sirius|

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 moon’s surface.

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

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

Que: 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 _________ 

Ans: 

(a) Neptune

(b) Mars

(c) constellation

(d) satellite

(e) stars

(f) Mars, Jupiter

Que: 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. ( )

Ans: 

(a) False

(b) True

(c) False

(d) True

(e) False

(f) False

Que: 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

Ans:

(i) - (e), (g)

(ii) - (a)

(iii) - (c), (f)

(iv) - (d)

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

Ans: In west side of the sky.

Que: Name the largest planet of the solar system.

Ans: jupiter|

Que: What is a constellation? Name any two constellations.

Ans: A group of stars which has a recognizable shape is called a constellation.
Example: Ursa Major, Orion