Q. The orbit period of smallest planet 'Mercury' is

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Q. The number of artificial satellite 'Moon' for the planet Mercury is

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Q. Considering facts about Mercury, the planet Mercury was first recorded by Assyrian astronomers in

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Q. Name of the Planet Mercury was named on the

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Q. Second densest planet in the solar system is

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Q. Considering facts about Mercury, the name of the largest impact crater on planet Mercury is

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Q. The height of mesosphere which lies after the troposphere is

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Q. Ozone layer is part of

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Q. Name of the highest clouds in the atmosphere that can be seen with the naked eye is

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Q. Layer 'mesosphere' is used by

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Q. Height of exosphere is

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Q. Region of atmosphere which occupies the area below the thermosphere and above the stratosphere is classified as

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Q. Layer of Earth's atmosphere which is accessed by rockets is

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Q. When the Sun is '4' to '16' degrees below the horizon in mesosphere layer of atmosphere is classified as

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Q. Layer of Earth's atmosphere which is used by International Space Station is known as

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Q. Height of thermosphere is

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Q. Top area of third layer of atmosphere 'mesosphere' is known as

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Q. The name of extremely effective fire extinguishing agent is

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Q. Chemical substance used in industry for cold cleaning, is known as

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Q. Layer of atmosphere in which the Ozone layer lies is

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