Q1. State True/False
i. Axis of the earth is an imaginary line about which the earth rotates. ________
ii. Earth takes exactly 365 days to revolve around the sun. _______
iii. Day and Night on the Earth occurs due to rotation of the Earth. _______
iv. On 21st march, the Tropic of Capricorn receives direct rays of the sun as the South Pole tilts towards it. ________
v. Every fourth year, February is of 29 days instead of 28 days. ____
vi. When there is spring in the Northern Hemisphere and summer in the Southern Hemisphere. _________
Q2. Fill in the blanks.
i. The earth receives light from _____________.
ii. The earth takes about _______________to complete one rotation around its axis.
iii. The period of rotation is known as the_____________.
iv. On 23rd September, it is __________season in the Northern Hemisphere and ___________season in the Southern Hemisphere.
v. The portion facing the sun experiences ___________while the other half away from the sun experiences____________.
vi. The axis of the earth makes an angle of _______ degree with its orbital plane.
vii. Australia lies in _______________Hemisphere.
viii. The longest day and the shortest night at these places occur on _________________.
Q3. When Christmas is celebrated in Australia?
Q4. Which motion of the earth causes change in seasons?
Q5. What is the shape of the Earth?
Q6. How long does it take the earth to complete one rotation around its axis?
Q7. When do the sun rays fall directly on the equator?
Q8. Why areas near the poles receive less heat?
Q9. What causes change in seasons?
Q10. Why do seasons occur?
Q11. Why days and nights are not of equal length?
Q12. Differentiate between rotation and revolution of earth.
Q13. Why do the poles experience about six months of day and night?