Introduction to Acid and Base — Science STD 8 — Question

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A person 1m in front of a plane mirror seems to be __________ m away from his image.

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Sulphur forms ______ oxide whereas magnesium forms ________ oxide.

Non-metals form ………. ions by gain of electrons.

Electronic configuration of fluorine is …………….

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Orion constellation can be used to locate the position of __________ star whereas Ursa Major constellation can be used to locate the __________ star in the night sky.

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The shape of an aeroplane is similar to that of a ____________________ in flight.

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A fuel must be heated to its ________ before it starts burning.

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A meteoroid becomes a __________ on entering Earth's atmosphere.

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Blue-green algae fix ______ directly from air to enhance fertility of soil.

The shell-wise distribution of electrons is called the ………………… .