Solid Friction Viscosity MCQ (Multiple Choice Questions) PDF Download

Magnitude of the coefficient of viscosity is given by

1. frictional force ⁄ (area × velocity gradient)
2. (frictional force × velocity gradient) ⁄ area
3. (frictional force × area) ⁄ velocity gradient
4. None of the above

Given that the normal reaction is constant, the friction force is

1. directly proportional to the area of the contact of the given surfaces
2. inversely proportional to the area of the contact of the given surfaces
3. directly proportional to the square of the area of the contact of the given surfaces
4. independent of the area of the contact of the given surfaces

Coefficient of viscosity may be expressed in units of

1. kg s m^-2
2. kg m s^-2
3. N s m^-2
4. N m s^-2

Coefficient of static friction is equal to

1. limiting friction force (F) × normal reaction force (R)
2. limiting friction force (F) ⁄ normal reaction force (R)
3. normal reaction force (R) ⁄ limiting friction force (F)
4. None of the above

Dimensions of coefficient of friction are

1. [M] [L] [T]^-2
2. [M]^-1 [L]^-1 [T]²
3. [M] [L]^-1 [T]^-1
4. It's a dimensionless quantity