

MCQOPTIONS
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1. |
In which of the following cases the friction is helpful (H) and troublesome (T)?(a) Lighting a matchstick(b) Applying the brakes on a cycle(c) Use a towel to open tightly closed lid of a bottle(d) Pulling drawer out of a desk |
A. | (a)(b)(c)(d)TTHH |
B. | (a)(b)(c)(d)HHTT |
C. | fibrous roots |
D. | (a)(b)(c)(d)HHHT |
Answer» E. | |