Observation

The expected responses were;
(a)        Function of a damping force in a measuring instrument
The damping force causes the pointer to settle down to its final value without oscillation.
                                                                                                                       
(b)       Methods by which damping force is achieved in measuring instrument

• Air dashpot damping
• Eddy current damping

                                     
(c)       Advantages of moving-coil measuring instrument over moving-iron

• Uniform/linear scale
• Not affected by stray magnetic field
• Higher sensitivity
• Perfect damping achieved                                                                                                                                          

Candidates that attempted this question performed poorly.