Which of the following reduces friction?

Washing away lubricants from ball bearings

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Making the surface rougher

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Applying more pressure on the surface

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Streamlining the design of cars, aeroplanes and rockets

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Solution

The correct option is D Streamlining the design of cars, aeroplanes and rockets
When the cars, aeroplanes and rockets move through the air, they suffer air resistance which slows down their movement. When their shape is streamlined, the drag or fluid friction is reduced, hence helping in achieving higher speeds.
All other options given increases the friction between the surfaces.

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Similar questions

Q. Which of the following is used to reduce friction :
1. Streamlines
2. Use of ball bearings
3. Lubrication

Why are cars, aeroplanes and rockets streamlined?

Q. Which of the following should be used to reduce friction on a carrom board?
(a) a lubricating oil
(b) a dry lubricant
(c) a layer of grease
(d) a ball bearing

Q. are designated routes along which aeroplanes fly from one airport to another.

Which of these reduces friction between two objects?
(i) Use of wheels and rollers
(ii) Smoothening the surfaces of contact
(iii) Use of lubricants
(iv) Changing the colour of vehicles

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