Chapter 1
Our World
Exercise-3
(a) What does the alphabet say?
Ans: Circle lines drawn in east-west direction on Earth are called lines.
(b) What is the angular value of the equator?
Answer: The angular value of equator is 0°.
(c) What is the angle between the poles and the poles?
Answer: The angular value of North is 90° North latitude and the angular value of North is 90° South latitude.
2. Describe the equator.
Answer: Equator is an imaginary circular line at the center of the earth. It divides the northern and southern hemisphere equally. The angle between E and Y is 0° inside the graph.
3. Draw a picture of this sphere and show its cardinal directions.
Answer: For this question, draw a picture of the sphere and mark the equator, equator, cloud line, north and south poles. I can provide the image format if you wish.)
Exercise-4
(a) What is the longitude?
Ans: The imaginary semicircular meridian with the north pole and the south pole at a distance from each other and centered on each other is called meridian.
(b) What is longitude?
Ans: Any place on the earth that is at least east or west along the prime longitude is called angular distance longitude.
(c) Earth's east and west - in these two directions, the meridian is visualized?
Ans: 180 degrees of latitude and 360 degrees of longitude are imagined in the east and west directions of the earth.
(d) What is the prime meridian?
Answer: The meridian that passes through Greenwich Mean Time is called Prime Meridian (0° Longitude).
2. Explain about longitude.
Ans: The diagonal diagram is an imaginary semicircle with the north pole and the south pole. This line divides the earth east-west and is very important in the field of time calculation.
3. Write the major difference between longitude and latitude.
Answer: Tensile longitude
The direction is east-west north-south
Number 181 (0°–90°N/S) 360 (0°–180°E/W)
Objective: Determine latitude, longitude and calculate time.
Exercise-5
(a) What is the full form of 'NASA'?
Answer: NASA = National Aeronautics and Space Administration .
(b) On whose axis does the Sun revolve?
Answer: The sun does not rotate in any direction, but the earth rotates in the direction of the sun.
(c) How much time does it take for the Earth to rotate around its axis?
Answer: It takes 24 hours.
(D) What do you say about Apasura and Anusura?
Answer: The distance of the earth from the sun is called opusura and the position of the earthis called aposura .
(e) How much time does it take for the Sun to orbit the Earth?
Answer: It takes 365 days and 6 hours .
2. Ahnik Gati Kak Bole. Write these two results.
Answer: The Earth spins on its own spinneret.
Results:
1. Day and night are created.
2. Time calculation is possible.
3. Annual motion crow bowl? Write these two results.
Answer: The annual speed of the Earth's rotation around the Sun is called the annual speed.
Results:
1. Seasons change.
2. The length of day and night is fixed.
4. Why is it not day and night in two different regions of the world?
Answer: As the earth rotates on its axis, one part of the earth receives sunlight and the other part is dark, because of this there is no day and night in two different parts of the earth.
Krishna Saikia
