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Q.

A sharp blade is more effective in cutting than a blunt blade due to


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a

Low force

b

Low pressure

c

Large contact area

d

Small contact area 

answer is D.

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Detailed Solution

A sharp edge blade is more effective in cutting than a blunt blade due to the small contact area.
It is known that “Pressure is defined as the force exerted per unit area of cross-section.” Mathematically,
P=F/A
where P, F and A are the pressure, force and the area of cross-section.
Hence, it can be observed that the pressure exerted is inversely proportional to the cross-sectional area. In this case, the knife with a sharp blade would have a lesser cross-sectional area and hence a greater pressure.
 
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