The chapter “How Days and Nights are Formed” discussed in this post is taken from the Class 4th Let’s Look Around and Learn Environmental Studies Textbook for students of JKBOSE. In this post, I am providing you with Solutions to How Days and Nights are Formed Class 4 Questions. In my last post, you read about Chapter 6 Safe Drinking Water Summary Notes. Let’s begin:
How Days and Nights are Formed Class 4 Questions
Introduction
The chapter “How Days and Nights are Formed” tells students about the process of formation of day and night on the earth. The teacher demonstrates the process to the students with the help of an example using a torch and a ball.
How Days and Nights are Formed Class 4 Question Answers
Oral Work Page No. 61 – 62
1. What will you call the part of the earth which gets sunlight?
Ans. The part of the earth which gets sunlight is called day.
2. In which direction does the sunrise?
Ans. The sun rises in the east.
3. In which direction does the sunset?
Ans. The sun sets in the west.
4. Which movement of the earth makes day and night?
Ans. The rotation of the earth is responsible for the formation of day and night on earth.
5. How long does it take the earth to complete one rotation on its axis?
Ans. It takes 24 hours for the earth to complete one rotation on its axis.
Written Work Page No. 62
1. What is the movement of the earth on its own axis called?
Ans. The movement of the earth on its axis is called the rotation of the earth.
2. What is rotation?
Ans. The movement of the earth (or a body) about its axis is called rotation.
3. What is one year?
Ans. It is the time taken by the earth to complete one revolution around the sun.
4. What is the effect of the rotation of the earth on our lives?
Ans. Due to the rotation of the earth, day and night are formed which affect our lives in many ways. We go to our work during the day and go to sleep for rest during the night. During day time we get natural light from the sun while there is no such natural light at night.
5. What is the difference between one day and one year?
Ans. One day is the time taken by the earth to complete one rotation about its own axis.
1 day = 24 hours
On the other hand, one year is the time during which earth completes one revolution around the sun.
1 year = 365 days.
= 365 x 24 hours
= 8760 hours
6. How many minutes the earth takes to complete one rotation?
Ans. The earth takes 1 day to complete one rotation about its own axis.
1 day = 24 hrs.
= 24 x 60 minutes
= 1440 minutes.
Things to do Page No. 62
- Play the game of formation of day and night in your friends’ home with the help of a ball or a globe and a torch. Show this game to your brothers, sisters and friends.
Ans. Do it yourself.
- Make a list of the activities you do in the day and at night. ·
Ans. Do it yourself.
- Find out what they do at night.:
(i) Watchman (ii) Owl (iii) Dog (iv) Bat.
Ans. (i) Watchman – Takes care of our belongings at night.
(ii) Owl – It can see at night and search for its prey at night.
(iii) Dog – It takes care of our home as a watchman.
(iv) Bat – It remains awake at night and searches for its prey.
How Days and Nights are Formed Class 4 Notes
In this chapter, the teacher demonstrates to the students about formation of days and nights on the earth. She begins with this activity.
In the picture above there is a ball lying on the table and the teacher is holding a lighted torch in front of it. It looks like this.
Here we see.
- The light from the torch is falling on the surface of the ball facing the torch.
- The other surface of the ball is not getting any light.
When we rotate the ball, the surface of the ball facing the torch is moving towards the back and the surface on the back is moving towards the torch.
Now, after rotating the ball to 1800 the surface of the ball that was at the backside faces the light of the torch while the surface of the ball facing the light of the torch is at the back.
In a similar way days and nights are formed, where a torch is replaced by the sun and a ball is replaced by the earth.
The picture above shows the globe. The globe is a three-dimensional model of earth. The earth rotates on its axis from west to east.
The movement of the earth on its own axis is called Rotation. Days and nights are formed due to this rotation of the earth.
The part of the earth that receives sunlight has a day on it while the part of the earth which does not receive sunlight has a night on it.
The earth completes one rotation on its axis in 24 hours and we call it a day. The earth also shows movement around the sun, it is called Revolution.
The time taken by the earth to complete one revolution is called one year.
That’s all we have about
Leave a Reply