At what angle can the Pole Star be seen at the Poles and at the Equator?

1. 60°, 30°
2. 90°, 0°
3. 45°, 45°
4. 0°, 90°

Assertion (A): The pole star lies in line with the axis of the earth with its angle decreasing towards the Equator.

Reason (R): The earth is spherical in shape.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

Earth's diameter at the Equator is …………… and at the poles is …………… .

1. 12,750 km, 12,715 km
2. 12,752 km, 12,726 km
3. 12,714 km, 12,755 km
4. 12,756 km, 12,714 km

Ancient cultures took earth for a disk, but very soon the observation of stars and planets revealed that earth resembles a sphere. After the late 1700s measurements showed that earth is slightly flattened at the poles. What is the shape of the earth?

1. Sphere
2. Oblate
3. Oval
4. Oblate Spheroid