Page 131 - SST Class 06

g Less than half of the earth is always in darkness.
g The effect of inclination goes on increasing as we move towards the poles.
g The earth has a tilt of 23.5 degrees relative to the “ecliptic plane”.

A. Tick (3) the correct option.

1. _____________ main seasons are also caused due to the inclination of the earth.
(a) Four (b) Five (c) Six
2. The earth rotates from the:

(a) east to the west (b) west to the east (c) south to east
3. The speed of the earth’s rotation is about _____________ miles per hour.

(a) 1,040 (b) 1,042 (c) 1,041
4. This circle of illumination moves gradually from the east towards the:
(a) west (b) north (c) south

5. The effect of inclination goes on increasing as we move towards the:
(a) equator (b) poles (c) latitude
6. The earth has a tilt of _____________ degrees relative to the “ecliptic plane”.

(a) 23.4 (b) 23.6 (c) 23.5

B. Give one technical term for each of the following.
1. On these two dates, days and nights are of equal duration throughout the world.
______________
2. The tilting of the earth on its axis. ______________

3. The fixed path followed by the earth around the sun. ______________
4. The rays of the sun received at an acute angle on the earth. ______________
5. The season when the weather is very pleasant and flowers start blooming. ______________

C. Write True or False.
1. The earth is in constant motion.

2. If the axis of the earth was vertical, then days and nights would not be of
equal lengths at all places.
3. The earth basically has three types of motions.
4. The part of the earth that faces the sun is lighted.

5. At midnight, the ‘Circle of Illumination’ has moved exactly on the opposite side.
6. The earth moves around the sun at a speed of about 100,00 km per hour.
7. A leap year is generally divisible by four and has 365 days.

Social Science-6 131