Motion of the Earth
Q1. State True/False
Axis of the earth is an imaginary line
about which the earth rotates. True
Earth takes exactly 365 days to revolve
around the sun. False
Day and Night on the Earth occurs due to
rotation of the Earth. True
On 21st march, the Tropic of
Capricorn receives direct rays of the sun as the South Pole tilts towards it. False
Every fourth year, February is of 29 days
instead of 28 days. True
When there is spring in the Northern
Hemisphere and summer in the Southern Hemisphere. False
Q2. Fill in the blanks.
The earth receives light from the sun.
The earth takes about 24 hours to
complete one rotation around its axis.
The period of rotation is known as the earth day.
On 23rd September, it is autumn season in the Northern Hemisphere and spring season in the Southern Hemisphere.
The portion facing the sun experiences day while the other half away from the sun
The axis of the earth makes an angle of 66½ degree with its orbital plane.
Australia lies in Southern Hemisphere.
The longest day and the shortest night at
these places occur on 21st June.
Q3. When Christmas is celebrated in Australia?
Christmas is celebrated in Australia in the summer season.
Q4. Which motion of the earth causes change in seasons?
Revolution of the earth causes change in seasons.
Q5. What is the shape of the Earth?
Earth is spherical in shape.
Q6. How long does it take the earth to complete one rotation
around its axis?
earth takes about 24 hours to complete one rotation around its axis.
Q7. When do the sun rays fall directly on the equator?
21st March and September 23rd, direct rays of the sun
fall on the equator.
Q8. Why areas near the poles receive less heat?
The areas near the poles receive less heat as the rays of the sun are slanting.
Q9. What causes change in seasons?
Seasons change due to the change in the position of the earth around the sun.
Q10. Why do seasons occur?
Ans. The seasons are caused by the tilt of the
Earth's rotational axis away or toward the sun as it travels around the sun in
Q11. Why days and nights are not of equal length?
Days and nights are not equal length because of the inclined axis of the earth.
As earth is tilted at an angle of 23.4°, days are longer in summers than in
Q12. Differentiate between rotation and revolution of earth.
is the movement of the earth on its axis.
Revolution is the movement of the earth around the sun in a fixed path or
It causes day and night.
It causes seasons.
Q13. Why do the poles experience about six months of day and
The Poles experience about six months of day and six months of night because of
the tilt of the Earth on its axis. When the North Pole is tilted towards the
Sun, it experiences continuous daylight for six months and when the South Pole
is away from the sun, it experiences continuous darkness for six months.