1. When one body rolls over the surface of another body the resistance to its motion is called _____ [ ]a) Static friction b) Sliding friction c) Rolling friction d) Kinetic friction2. Friction oppose the _____ between the surface in contact with each other [ ]a) motion b) Relative motion c) Both a & b d) None of these3. Friction is [ ]a) Friend b) Foe c) Both a & b d) None of these4. Vehicles are streamlined to reduce [ ]a) Static friction b) Kinetic friction c) Sliding friction d) Fluid friction5. Friction is [ ]a) Always advantagesb) Always disadvantagesc) Some times advantages and sometimes disadvantagesd) Neither an advantages nor disadvantages6. The use of lubricants [ ]a) Decreases friction b) Increases friction c) Make it stable d) None of these7. The methods to reduce the friction [ ]a) By using lubricants b) By using ball beaningsc) Both a & b d) None of these8. The coefficient of static friction [ ]a) Less than 1 b) Greater than 1 c) Equal to 1 d) All the above9. The SI unit of coefficient of static friction is [ ]a) N b) Nm c)Nmd) Unitless10. The SI unit of friction is [ ]a) N b) Nm c)Nmd) Unitless​