21). Match the following : A. Largest Planet 1. Pluto B. Brightest Planet 2. Jupiter C. Densest Planet 3. Earth D. Smallest Planet 4. Venus Below options are given in A B C D order
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22). The exact time taken by the earth for single rotation on its own axis is :
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23). Match the following : Planet Gases in atmosphere A. Venus 1. Hydrogen and helium B. Mars 2. Hydrogen, helium, ammonia, methane C. Saturn 3. Carbon dioxide ammonia and methane D. Jupiter 4. Carbon dioxide and nitrogen Below options are given in A B C D order
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24). Consider the following astral bodies 1. Sirius 2. Venus 3. Mars The correct sequence in decreasing order of their brightness is :
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25). A black hole is a :
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26). Ursa Minor is :
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27). Asteroids have their orbits between the planets :
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28). Halley's comet appears once in a period of :
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29). The orbits of planets around the Sun or of satellites around the Earth, can be :
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30). To a space traveller on moon, the lunar sky during day time appears :
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