Which of the following pairs of metals are supposed to constitute the internal core of the earth?
| A. | Chromium & Iron |
| B. | Magnesium & Lead |
| C. | Iron & Copper |
| D. | Nickel & Iron |
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Option: D Explanation : Click on Discuss to view users comments. |
What is 'Siderial Day'?
| A. | The day on which the duration of sunshine is the maximum. |
| B. | The day on which the duration of sunshine and darkness are equal. |
| C. | The time during which the earth makes a complete revolution on its axis in respect of the fixed stars. |
| D. | The day on which the sun reaches its maximum distance from the equator. |
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Option: C Explanation : Click on Discuss to view users comments. |
Which of the following statements are true regarding the Earth?
1. It is a Satellite of the Sun.
2. Its motion around the Sun is called rotation.
3. Gravitational force of Sun and Earth is responsible for keeping it in orbit.
4. It receives light from the Sun.
| A. | 1 and 2 only |
| B. | 1, 2 and 3 only |
| C. | 2 and 4 only |
| D. | 3 and 4 only |
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Option: D Explanation : Click on Discuss to view users comments. |
Albedo is defined as
| A. | UV radiations sent out by the Sun |
| B. | a substance contained in the upper atmospheric layers of the earth, which is responsible for the reflection of a part of solar radiations |
| C. | celestial bodies in earth's atmosphere which add to the green house effect |
| D. | the amount of insolation reflected back to the Space by the top of atmosphere, by clouds and ice-covered areas of the Earth's surface |
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Option: D Explanation : Click on Discuss to view users comments. |
