The exact time taken by the earth for single rotation on its own axis is
| A. | 24 hrs |
| B. | 24 hrs 5 secs |
| C. | 23 hrs 50 minutes 7.2 secs |
| D. | 23 hrs 56 minutes 4.09 secs |
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Option: D Explanation : Click on Discuss to view users comments. |
Green House Effect means
| A. | pollution in houses in tropical regions |
| B. | trapping. of solar energy due to atmospheric oxygen |
| C. | trapping of solar energy due to atmospheric carbon dioxide |
| D. | Cultivation in green houses so as to check pollution. |
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Option: C Explanation : Click on Discuss to view users comments. |
It is six months long day in the northern polar region and six months long night in the southern polar region because
| A. | earth is revolving around the sun |
| B. | earth is inclined towards its orbital plane |
| C. | earth is rotating |
| D. | None of these |
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Option: B Explanation : Click on Discuss to view users comments. |
At a latitude of 450 the earth spins on its axis at the rate of
| A. | 420 km/hr. |
| B. | 745 km/hr. |
| C. | 1120 km/hr. |
| D. | 1542 km/hr. |
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Option: C Explanation : Click on Discuss to view users comments. |
Spring tides occur when
| A. | the moon is nearest to the earth |
| B. | the moon is farthest from the earth |
| C. | the moon the sun and the earth are at right angles to .the earth at the apex |
| D. | the moon, the sun and the earth are in the same line. |
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Option: D Explanation : Click on Discuss to view users comments. |
