Earth - Study Mode

[#131] Consider the following statements: 1. The tropical year is shorter than the sidereal year. 2. The solar day is longer than the sidereal day. Which of the statements given above is/are correct?
Correct Answer

(C) Both 1 and 2

Explanation

Solution: The tropical year is shorter than the sidereal year. A sidereal year is the time it takes for the sun to return to the same position with respect to the stars. The solar day is longer than the sidereal day. Because of the Earth's revolution, a solar day is slightly longer than a sidereal day.

[#132] The Synchronous satellite moves around the Earth from
Correct Answer

(B) West to East

Explanation

Solution: Synchronous satellite is an artificial satellite moving in circular orbit round the Earth in 24 hours duration along with the rotatory movement of Earth i.e. west to east.

[#133] What is 'Sidereal Day'?
Correct Answer

(C) The time during which the earth makes a complete rotation on its axis in respect of the fixed stars

Explanation

Solution: The time during which the earth makes a complete rotation on its axis in respect of the fixed stars is known as 'Sidereal Day'. The sidereal day is the time it takes for the Earth to complete one rotation about its axis with respect to the 'fixed' stars.

[#134] The earth revolves round the sun in its orbit by approximately ________
Correct Answer

(A) 1° per day

Explanation

Solution: The earth revolves round the sun in its orbit by approximately 1° per day.

[#135] The equatorial circumference is greater than the polar circumference by approximately ________
Correct Answer

(B) 67 km

Explanation

Solution: This results in the Earth having a polar circumference of 40008 km, and an equatorial circumference of 40075 km, a difference of 67 kilometers(approximately) .