MOTIONS OF THE EARTH
1. Answer the following questions briefly.
(a) What is the angle of inclination of the earth’s axis with its orbital plane?
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(b) Define rotation and revolution.
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(c) What is a leap year?
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(d) Differentiate between the Summer and Winter Solstice.
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(e) What is an equinox?
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(f) Why does the Southern Hemisphere experience Winter and Summer Solstice
in different times than that of the Northern Hemisphere?
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(g) Why do the poles experience about six months day and six months night?
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2. Tick the correct answers.
(a) The movement of the earth around the sun is known as
(i) Rotation (ii) Revolution (iii) Inclination
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(b) Direct rays of the sun fall on the equator on
(i) 21 March (ii) 21 June (iii) 22 December
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(c) Christmas is celebrated in summer in
(i) Japan (ii) India (iii) Australia
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(d) Cycle of the seasons is caused due to
(i) Rotation (ii) Revolution (iii) Gravitation
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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 fall vertically on the Tropic of ___________ on 21st June.
(e) Days are shorter during ___________ season
