The expected answers were:
(a) (i)      Reactance

This is the opposition offered by a pure inductor or pure capacitor to the passage of electric/alternating current.            

   (ii)      Impedance

This is the total opposition offered by a circuit containing resistances and reactances to the passage of alternating/electric current.
(b)    
         

 

 

 

 

1. Resonance frequency

 fr=                          

                   

                   

                   

                   

                               

(ii)      Inductive reactance

                    XL       =  2fL        
                    XL       =  2 x159 x 0.05
                    XL       =  50Ω        

(iii)     Capacitive reactance
                    XC       =        
                    XC       = 
                    XC       =  50 Ω

The question was on Circuit Analysis. The question was very popular with the candidates. Most candidates that attempted this question did well in the part (b), while quite a few could not define reactance and impedance, mistaking reactance for resistance. The performance was fair.