Which of the following is not a way to reduce friction?
a) Use of lubricant
b) Smoothening the rubbing surfaces
c) Increasing the roughness of the surface
d) Changing the sliding friction to rolling friction
Which of the following is not a simple machine?
a) Bicycle
b) Screw driver
c) Wheel
d) Wedge
Which of the following is not a simple machine?
a) Bicycle
b) Screw driver
c) Wheel
d) Wedge
Simple machine is a tool that;
a) Gives energy to other machines
b) Does only one job
c) Makes the work easier
d) Made of many small parts
The point about which a lever turns is called;
a) Effort
b) Load
c) Fulcrum
d) Weight
Wheel barrow is an example of the lever of;
a) First kind
b) Second kind
c) Third kind
d) Both I and II kind
