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7. The parts of motor cars are polished by chromium because the angle of contact between water and chromium is

(a) 0^o

(b) 90^o

(c) Less than 90^o

(d) Greater than 90^o

Ans. d

PrevPrevious17. A small sphere of mass m is dropped from a great height. After it has fallen 100 m, it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first 100 m of fall is

Next6. A liquid is coming out from a vertical tube. The relation between the weight of the drop W, surface tension of the liquid T and radius of the tube r is given by, if the angle of contact is zeroNext

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