The DAV Class 5 Science Solutions and DAV Class 5 Science Chapter 12 Question Answer – Observing The Sky are essential study tools for DAV public school students in Class 5.
DAV Class 5 Science Chapter 12 Question Answer – Observing The Sky
DAV Class 5 Science Ch 12 Question Answer – Observing The Sky
Something To Know
A. Fill in the blanks.
Question 1.
A group of stars that appear to fonn a pattern in the sky is known as a ______
Answer:
constellation
Question 2.
A planet is ______ to us than the stars.
Answer:
closer
Question 3.
The planets are also known as ______
Answer:
closer
Question 4.
The pole star defines the ______ direction.
Answer:
closer
Question 5.
Stars ______ but planet do not ______
Answer:
closer
B. Match the following.
| Column I | Column II |
| 1. a constellation visible in winter | (a) Sun |
| 2. the ‘morning stars’ | (b) Moon |
| 3. a constellation visible in spring | (c) Orion |
| 4. the brightest object in the night sky | (d) Ursa Minor |
| 5. a star of average brightness | (e) Mercury and Venus |
Answer:
| Column I | Column II | |
| 1. a constellation visible in winter | c | (a) Sun |
| 2. the ‘morning stars’ | e | (b) Moon |
| 3. a constellation visible in spring | d | (c) Orion |
| 4. the brightest object in the night sky | b | (d) Ursa Minor |
| 5. a star of average brightness | a | (e) Mercury and Venus |
C. Tick (✓) the correct option.
1. The planet that can be (sometimes) seen in the evening sky, even with unaided eye, is
(a) Neptune
(b) Saturn
(c) Mercury
(d) Uranus
Answer:
(c) Mercury
2. The two stars, at the top of Ursa Major, are called
(a) Pole Stars
(b) Big Dipper
(c) Small Dipper
(d) Pointers
Answer:
(d) Pointers
3. The Cassiopeia is
(a) a bright group of stars in the sky
(b) an artificial satellite
(c) the name given to a spaceship
(d) a constellation visible in autumn
Answer:
(d) a constellation visible in autumn
4. From the following, the object in the sky, that (apparently) moves least in a given time is
(a) North Star
(b) Venus
(c) Sun
(d) Moon
Answer:
(a) North Star
5. The brightest planet in the night sky is
(a) Jupiter
(b) Venus
(c) Mars
(d) Neptune
Answer:
(b) Venus
6. On closely observing some bright stars, for some hours, one finds that stars appear to move from
(a) east to west
(b) west to east
(c) north to south
(d) south to north
Answer:
(a) east to west.
D. Answer the following Questions in brief.
Question 1.
Why do, we usually not see the stars during the day?
Answer:
Stars are present all the time in the sky. But they are not visible during day because of the bri ghtness of the sun.
Question 2.
In which part of the sky are we likely find Venus when it is visible as an evening star?
Answer:
West
Question 3.
State the cause of the apparent motion of the sun from east to west?
Answer:
Since the earth rotates from west to east, the apparent path of the sun in the sky is from east to west.
Question 4.
Name the special star in the northern hemisphere. Why has it been useful for travellers?
Answer:
North Star or Pole Star is the special star in the northern hemisphere. The apparent position of the Pole Star never changes. Hence, it has been useful for travellers.
E. Answer the following Questions.
Question 1.
Define the term ‘constellation.
Answer:
Some stars appear to form some kind of pattern. The pattern resembles some similar figures. Such a group of stars is called a constellation.
Question 2.
In what respect is, the Pole Star, different from other stars?
Answer:
The Pole Star is in line with the axis of the earth. Hence, its apparent position in the night sky never changes. So, Pole Star is different from other stars.
Question 3.
Write two points of d ifference between a planet and a star.
Answer:
Difference between planet and star: Planets appear as tiny discs while a star appears like point because planets are closer to us than stars.
Stars appear to twinkle, while planets do not twinkle.
Question 4.
Why do stars appear to slightly shift their position in the night sky?
Answer:
The apparent position of stars change from east to west; because the earth rotates from west to east.
Question 5.
Why do stars appear as points to us?
Answer:
Stars are very far from us. Hence, they appear as points to us.
Value Based Questions
Question 1.
Do you think that pollution in atmosphere affects the natural phenomenon of twinkling of stars?
Answer:
This passage shows that Dhruv was unable to see twinkling of stars in Delhi. But he was able to see them twinkling when he was in the foothills of the Himalaya. This shows that pollution in atmosphere affects the natural phenomenon of twinkling of stars.
Question 2.
How did Dhruv behave with his grandparents? Share your own similar experiences with your friends.
Answer:
Dhruv behaved in nice and polite manner with his grandparents. Whenever I meet my grandparents, I also try to be nice and polite with them. I also enjoy listening to interesting stories from them.
Question 3.
State the name of one group of stars forming a familiar pattern seen in summer.
Answer:
Ursa Major
Something to Do
Question 1.
Try to locate Venus in the night sky. Find out from newspaper reports when Venus is likely to be visible.
Answer:
Do it yourself.
Question 2.
After sunset go, with your parents, to some large open ground from where the horizon is clearly visible. Look at a rising star. Mark its direction with respect to a pole or a tree. Next day go to the same spot a little earlier and observe the same star from the same position. Repeat, and tabulate, your observations for a few days. Discuss your findings with your teacher or friends.
Answer:
Do it yourself.
DAV Class 5 Science Chapter 12 Solutions – Observing The Sky
I. Multiple Choice Questions (MCQs)
1. Which of the following can be seen in the night sky as well as in the day sky?
(a) sun
(b) moon
(c) constellation
(d) stars
Answer:
(b) moon
2. Pole Star is seen in which direction?
(a) North
(b) South
(c) East
(d) West
Answer:
(a) North
3. Which of these appear similar to Ursa Major?
(a) Cassiopeia
(b) Orion
(c) Ursa Minor
(d) Leo
Answer:
(c) Ursa Minor
4. The Pole Star appears near which of these?
(a) moon
(b) Venus
(c) Orion
(d) Ursa Major
Answer:
(d) Ursa Major.
II. Fill in The Blanks
Question 1.
A ______ appear like a tiny dot in the night sky.
Answer:
star
Question 2.
______ is the brightest body in the
Answer:
moon
Question 3.
______ is the brightest body in the day sky.
Answer:
sun
Question 4.
Orion appears in the______ direction.
Answer:
south.
III. Answer the Following Questions
Question 1.
Which celestial body dominates the day time sky?
Answer:
Sun
Question 2.
Which celestial bodies dominate the night sky?
Answer:
Stars
Question 3.
What is a star?
Answer:
Stars are huge bodies of very hot gases. Stars emit their own light.
Question 4.
Write a brief note on Ursa Major.
Answer:
This constellation can be easily seen in the northern sky. This is also known as the Great Bear or Big Dipper. The two stars at the top of this are called the pointers. The pointers are in the line of the Pole Star (North Star).