waecE-LEARNING
Home
Technical
Mathematics
Languages
Science
Social Science
Art
Literature Arabic Islamic Studies C.R.K History MusicVisual Art Clothing/Textile Home Management Shorthand
 
Physics Paper 2, Nov/Dec. 2013  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments
Weakness/Remedies
Strength
















Question 4

                 Question 4
 A direct current of 10 A is passed through a voltameter continuously for 1 hour in order to deposit m grammes of a metal of electrochemical equivalent 1.2 x 10-7 kg C-1. Calculate m.
A popular question among the candidates and most candidates got the formular and substitution correctly.  However, few candidates had problem on how to convert the unit from gramme (g) to kilogramme (kg).  Another huddle was the handling of the multiplication of numbers in index notation and standard form.

_____________________________________________________________________________________________________
comments

The expected answer is
                      m   =   z It                                                                                             
                      m  =   1.2 x 10-7x 10 x 3600                                                                 
                        =   4 . 32  x  10-3kg                                                                         
                        =  4 . 32g

Powered by Sidmach Technologies(Nigeria) Limited .
Copyright © 2015 The West African Examinations Council. All rights reserved.