Stars and Solar System

Q1. Fill in the blanks.

                          i.        The planet which is farthest from the Sun is Neptune.

                         ii.        The planet which appears reddish in colour is Mars.

                        iii.        A group of stars that appear to form a pattern in the sky is known as a constellation.

                        iv.        A celestial body that revolves around a planet is known as satellite.

                        v.        Shooting stars are actually not stars.

                       vi.        Asteroids are found between the orbits of Mars and Jupiter.

         vii.        Stars appear to move from east to west.

         viii.        The Pole Star is not visible from the southern hemisphere.

                        ix.        Orion is also called the Hunter.

Q2. State True (T) or False (F).

                          i.        Pole Star is a member of the solar system. F

                         ii.        Constellation appears to move in the sky from east to west. T

                        iii.        Mercury is the smallest planet of the solar system. T

                        iv.        Uranus is the farthest planet in the solar system. F

                         v.        INSAT is an artificial satellite. T

                        vi.        There are nine planets in the solar system. F

          vii.        The moon has no atmosphere. T

         viii.        Constellation Orion can be seen only with a telescope. F

                        ix.        Ursa Major appears to revolve around the Pole Star. T

                         x.        Saturn appears yellowish in colour. T

Q3. 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

Q4. Which of the following is NOT a planet of the sun?
(a) Sirius
(b) Mercury
(c) Saturn
(d) Earth

Ans. (a) Sirius

Q5. 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.

Q6. Which is the nearest planet to the Sun?

Ans. Mercury is the planet nearest to the Sun.

Q7. What is a satellite?

Ans. A body revolving around another body is called a satellite.

Q8. Which is the farthest planet to the Sun?

Ans. Neptune is the farthest planet to the Sun.

Q9. Which two planets show phases like the Moon?

Ans. Mercury and Venus show phases like the Moon.

Q10. Which planet has large number of satellites?

Ans. Jupiter has a large number of satellites.

Q11. Which was the first artificial satellite launched by India?

Ans. Aryabhatta was the first Indian satellite.

Q12. Which two planets have asteroids between them?

Ans. Mars and Jupiter have asteroids between them.

Q13. Which is the only natural satellite of Earth?

Ans. Moon is the only natural satellite of the Earth.

Q14. Name some artificial satellites of the Earth.

Ans. INSAT, IRS, Kalpana-1, EDUSAT

Q15. What is a light year?

Ans. Light year is the distance travelled by light in one year.

Q16. What is the speed of light?

Ans. The speed of light is about 300,000 km per second.

Q17. What time of year is the constellation Ursa Major visible?

Ans. Ursa Major can be seen during summer time.

Q18. What is the smallest planet in the solar system?

Ans. Mercury is the smallest planet in the solar system.

Q19. Which planet is the biggest planet in the solar system?

Ans. Jupiter is the biggest planet in the solar system.