17. Star and The Solar System

Class 8 Science NCERT Solutions Chapter 17: Star and The Solar System (CBSE Guide with Answers & Explanations)

Chapter 17: Star and The Solar System

Exercises

Choose the correct answer in Questions 1-3.
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

Answer: (c) A constellation

[ A constellation is a group of stars forming a pattern in the sky, not an object in our solar system ]
2. Which of the following is NOT a planet of the sun?
(a) Sirius                  (b) Mercury
(c) Saturn                 (d) Earth

Answer: (a) Sirius

[ Sirius is a bright star (not a planet), while Mercury, Saturn and Earth are planets of the Sun]

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.

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

[ The phases of the moon occur due to the changing relative positions of the Sun, Earth, and Moon, so only the portion of the moon’s illuminated half facing Earth is visible to us. ]

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Posted 3 months ago