At the Bedford level canal area a famous experiment was carried out. How many poles were used and at what distance apart?

1. 3 poles, 5Km
2. 2 poles, 10Km
3. 4 poles, 5Km
4. 3 poles, 10Km

Assertion (A): With increase in altitude the circular horizon of the earth's surface also widens.

Reason (R): The earth's surface is flat.

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.

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.