1.

Water shows convex meniscus in narrow ________ and _________ tubes.

Answer»

GLASS, plastic
glass, wax COATED glass
wax coated glass, plastic
plastic, coloured glass

Solution :In case of wax coated glass and plastic tube, cohesive FORCES are PREDOMINANT over adhesive forces and HENCE water shows convex meniscus in narrow wax coated glass tube and plastic tube.


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