| (i) The tyres of vehicles have treads. |
| (ii) Gymnasts often apply a coarse material on their hands. |
| (iii) Saliva in our mouth helps us to swallow food. |
| (iv) A surgeon powders his hand before pulling on his plastic gloves |
A)
(i) (ii) (iii) (iv) Increasing Decreasing Increasing Decreasing
B)
(i) (ii) (iii) (iv) Decreasing Increasing Decreasing Increasing
C)
(i) (ii) (iii) (iv) Increasing Increasing Decreasing Decreasing
D)
(i) (ii) (iii) (iv) Decreasing Decreasing Increasing Increasing
Correct Answer: C
Solution :
Tread in tyre of vehicle increases resistance with the road to prevent skidding. To dry the hands by applying a coarse material increases the friction. Saliva reduces the friction in mouth so that food can be easily swallowed. Powder can reduce the friction so that gloves of the surgeon can be easily pulled.
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