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प्रश्न
Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain ______.
विकल्प
water vapour
only oxygen gas
air
none of these
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उत्तर
Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain air.
Explanation:
When Usha poured water on the lump of soil, the air trapped in it got displaced and air bubbles were formed.
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