Class 8 Science Chapter-17 Stars and Solar System DAV|CBSE Book 2021
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Class 8 Science Chapter-17 : Stars and Solar System
This Post Contains All The Exercises of Chapter 17 Science Of Class 8.
- A.Fill In The Blanks
- B. Match the following:
- C.Tick(√) The Correct Option
- D.Answer The Following Questions in Brief
- E.Answer The Following Questions
- Value Based Question
- Something To Do
SOMETHING TO KNOW
A. Fill in the blanks :
1. The spiral shaped galaxy in which our solar system is located is known as the Milky way.
2. The various shapes of the bright part of the moon as seen by us during the month are called phases of the moon.
3. The temperature on moon ranges from 100°C at 'noon' to - 173°C at 'night'.
4. The planet known to have the largest number of natural satellites at present is Saturn.
5. The comet, which 'visits' the earth every 76 years, is the Haley's Comet.
6. Asteroids are found between the orbits of Mars and Jupiter.
B. Match the following :
(1) Star nearest to the Earth - (b) Sun
(2) Brightest star in the night sky - (f) Sirius
(3) Star which appear stationary from the earth - (d) Pole star
(4) Constellation - (a) Orion
(5) The largest asteroid - (c) Ceres
(6) Global communication - (e) Geo-stationary satellite
C. Tick (✓) the correct option :
1. A star is twenty light years away from the earth. Suppose it brightens up suddenly today. After how much time shall we see this change?
Ans) 20 years
2. Three stars A, B and C are observed in the night sky. The colours of these stars are -
Star A: Blue colour
Star B: Red colour
Star C: White colour
The correct sequence, in terms of increasing order of their surface temperature is -
Ans) Star B < Star C < Star A
3. Stars like the Sun appear to move from east to west around the earth. This means that earth rotates from -
Ans) West to East
4. Phases of moon are observed because -
Ans) It is only sunlight which is reflected by some parts of the moon that reaches the earth.
5. The change in seasons on the earth occurs because -
Ans) The axis of rotation of the earth is tilted with respect to its orbit.
6. The diagram shows the various positions of a comet in its orbit. In which position will the tail of the comet appear to be the longest?
Ans) Position A
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