Question 1

Q1: 1. Match the column: \begin{tabular}{|l|l|} \hline \multicolumn{1}{|c|}{ Column I } & \multicolumn{1}{c|}{ Column II } \ \hline (i) Satellite of Eart...

Accepted Answer

Here is the matching of the columns:    (i) Satellite of Earth $\ightarrow$ (d) Moon    (ii) Red planet $\ightarrow$ (c) Mars    (iii) Constellation $\ightarrow$ (a) Orion    (iv) Planet which is commonly called an evening star $\ightarrow$ (b) Venus

Question 2

Q10: 10. During a clear night, try to observe the Big Dipper 3-4 times at an interval of 2 to 3 hours. Also try to locate the Pole Star each time. Does the...

Accepted Answer

Yes, the Big Dipper (Saptarishi) appears to move in the night sky, while the Pole Star (Dhruva tārā) appears stationary. Explanation: If you observe the Big Dipper multiple times over several hours during a clear night, you will notice that its position in the sky changes. It will appear to rotate c...

Question 3

Q11: 11. Think about the night sky and write a poem or a story on it.

Accepted Answer

A Story of the Night Sky In the quiet village of Nubra, nestled among majestic mountain peaks, lived Yangdol and Dorjay, twins with eyes full of wonder. Their greatest joy was the night sky, a vast, dark canvas painted with thousands of twinkling stars. Every evening, after dinner, they would sit ou...

Question 4

Q2: 2. (i) Solve the following riddle. My first alphabet is in MAN but not in CAN My second alphabet is in ACE and also in FAN My third alphabet is in RAT...

Accepted Answer

(i) Let us solve the riddle:    My first alphabet is in MAN but not in CAN: M    My second alphabet is in ACE and also in FAN: A    My third alphabet is in RAT and not in CAT: R    My fourth alphabet is in SUN but not in FUN: S The planet is Mars. (ii) Here are two similar riddles: Riddle 1: My firs...

Question 5

Q3: 3. Which of the following is not a member of our Solar System? (i) Sirius (ii) Comets (iii) Asteroids (iv) Pluto

Accepted Answer

The correct option is (i) Sirius. Explanation: Sirius is a star that is much farther away from us than our Sun. It is the brightest star in the night sky, but it is not a part of our Solar System. Our Solar System consists of the Sun, eight planets, their moons, and many smaller objects including as...

Question 6

Q4: 4. Which of the following is not a planet of the Sun? (i) Jupiter (ii) Pluto (iii) Neptune (iv) Saturn

Accepted Answer

The correct option is (ii) Pluto. Explanation: Jupiter, Neptune, and Saturn are all recognized as planets in our Solar System. Pluto, however, was redefined in 2006 by the International Astronomical Union (IAU) as a dwarf planet. While it revolves around the Sun, it does not meet all the criteria to...

Question 7

Q5: 5. Which is the brighter star, the Pole Star or Sirius?

Accepted Answer

Sirius is the brighter star. The chapter states that Sirius is the brightest star in the night sky. In contrast, the Pole Star is described as 'not very bright'.

Question 8

Q6: 6. An artist's representation of the Solar System is given in Fig. 12.12. Is the order of the planets correct? If not, write the correct order in the...

Accepted Answer

No, the order of the planets shown in Fig. 12.12 is not correct. The correct order of the eight planets in increasing distance from the Sun is: 1.  Mercury 2.  Venus 3.  Earth 4.  Mars 5.  Jupiter 6.  Saturn 7.  Uranus 8.  Neptune

Question 9

Q7: 7. A portion of night sky with stars is shown in Fig. 12.13. Look carefully and identify the groups of stars that form the patterns-the Big Dipper and...

Accepted Answer

To identify the Big Dipper, Little Dipper, and Pole Star in Fig. 12.13 (referring to Fig. 12.4 for guidance):    Big Dipper (Saptarishi): Look for a prominent group of seven bright stars that form a shape resembling a ladle or dipper. Four stars form the 'cup' and three stars form the 'handle'. You...

Question 10

Q8: 8. A portion of the night sky is shown in Fig. 12.14. Draw lines to connect the stars for Orion and label the star Sirius. You may refer to Fig. 12.3.

Accepted Answer

To identify Orion and Sirius in Fig. 12.14 (referring to Fig. 12.3 for guidance):    Orion: Look for three bright stars that form a short, straight line in the middle of the constellation; these represent Orion's belt. Around these three stars, you would connect other stars to form the outline of th...

Question 11

Q9: 9. You can see stars fading away at dawn and appearing at dusk. During the day we do not see the stars. Explain why.

Accepted Answer

During the daytime, the Sun is the star closest to Earth and shines with extreme brightness. The intense sunlight scatters in Earth's atmosphere, creating a bright blue sky. This overwhelming brightness from the Sun and the scattered light in the atmosphere makes the much fainter light from other di...

NCERT Solutions