Class 6 Geography Motions of the Earth Question Answer NCERT Solution in Hindi. NCERT Class 6 Geography Notes, Textual Question Answer and Important Question Answer also Available for Various Board Students like HBSE, CBSE, UP board, Mp Board, RBSE and some other State Boards.
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NCERT Solution for Class 6 Geography Chapter 3 Motions of the Earth Textual Question Answer
Motions of the Earth Class 6 Geography Chapter 3 Question Answer
1. Answer the following Questions briefly :
(a) What is the angle of inclination of the earth’s axis with its orbital plane ?
Ans. The axis of the earth is inclined at an angle of 66½° with the orbital plane. It is an imaginary line on which the earth rotates. It is tilted at an angle of 23½° from the vertical.
(b) Define Rotation and Revolution.
Ans. Rotation and Revolution are the two movements of the earth.
(i) Rotation : The spining of the earth en its axis from West to East is called rotation. It is the daily motion of the earth. The earth takes about 24 hours to complete one rotation.
(ii) Revolution: The movement of the earth around the sun in a fixed path or orbit is called revolution. The earth moves around the sun from West to East. It takes 365- days to complete one 4 revolution.
(c) What is a leap year ?
Ans. A leap year has 366 days. It comes after every four years. A normal year is taken to be of 365 days, but an extra day is added in a leap year. In a leap year, the month of February is of 29 days instead of 28 days. The next leap year will be year 2008.
(d) Differentiate between Summer and Winter Solstice.
Summer Solstice :
1. The earth is in this position on its orbit on 21st June.
2. The sun is over head on Tropic of Cancer (23½° N).
3. Days are longer than nights in the Northern Hemisphere.
4. There is summer season in the Northern Hemisphere and Winter season in the Southern Hemisphere.
Winter Solstice :-
1. The Earth is in this position on its orbit on 22nd December .
2. The sun is overhead on Tropic of Capricorn (23½° S).
3. Days are shorter than nights in the Northern Hemisphere.
4. There is winter season in the Northern Hemisphere and Summer season in the Southern Hemisphere.
(e) What is an equinox ?
Ans. Equinox is the position of the earth on March 21st and September 23rd along its orbit. The rays of the sun fall vertical on equator. The Circle of light passes through the poles. Neither of the poles is inclined towards the sun. It is neither very cold nor very hot all over the world. It is autumn on 23rd September in Northern Hemisphere and spring in the Southern Hemisphere. It is spring on 21st March in Northern Hemisphere and autumn in Southern Hemisphere
(f) Why does the Southern Hemisphere experience Winter and Summer Solstice on different times than that of the Northern Hemisphere ?
Ans. When the Northern Hemisphere is (on 21st June) inclined towards sun, it gets vertical rays and longer days. But at that time the Southern Hemisphere is tilted away from the sun, and gets slanting rays and shorter days. So when it is Summer in Northern Hemisphere, it is winter in Southern Hemisphere. The position is quite opposite on 22nd December.
(g) Why do the poles experience about six months day and six months night.
Ans. Due to inclination of the axis, North pole is inclined towards the sun from 21st March to 23rd September. The sun remains above the horizon for six months at North pole. There is continuous day light for six months. But South pole has a night in six months. For the next six months, conditions are reversed. North pole has a night for six months and South pole has a day of six months.
Q 2. Tick the correct Answers :
(a) The movement of the earth around the sun is known as
Ans. (ii) Revolution.
(b) Direct rays of the sun fall on equator on …………
(i) 21st March
(ii) 21 June
(iii) 22nd December
Ans. (i) 21st March.
(c) Christmas is celebrated in summer in ………
Ans. (ii) Australia.
(d) Cycle of the seasons is caused due to …….
Ans. (ii) Revolution.
Q. 3. Fill in the blanks :
(a) A leap year has ……………………. number of days.
(b) The daily motion of the earth is ……..
(c) The earth travels around the sun in ……. orbit.
(d) The sun’s rays full vertically on the tropic of ……. on 21st June.
(e) Days are shorter during ……….season.
Ans. (a) 366 (b) Rotation (c) elliptical (d) Cancer (e) winter.