Q. 1. 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 (a) water vapour (b) only oxygen gas (c) air none of these.

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  • Solution:

(c): air

When the water is poured on the lump of soil, the soil absorbs the water in the form of bubbles.

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