May 2012 NABTEB 2012 MAY/ JUNE CERTIFICATE EXAMINATION PHYSICS PRACTICAL QUESTION AND ANSWER ELECTRICITY
(3) e.m.f of cell –2volts s/n;1,2,3,4,5,6 “L/ cm;”10.00,20.00,30.00,40 “I/ A;”0.56,0.46,0.44,0.38,0. “I^-1/ A^-1;”1.786,2.083,2.273,2. for graph purpose, plot d graph of L/cm against I^-1/A^-1
precautions -i ensured dat d key is opened wen reading is not taking two avoid run down of d cell
=>i ensured dat i avoided error due to parallax
=>i ensured dat i mak tight connection
(3b)(¡) see on graph sheet
(1)two avoid run down of d cell
(2) two avoid over heating of two cell
(3b)(¡¡¡) generator and dynamo and solar energy, Mechanic
(1) Centre of gravity of metre rule G=49.9cm readings(in tabular) “s/n”;1,2,3,4,5 “d/ cm”;44.90,39.90,34.90,29.
“t2 s;”32.20,31.20,30.40,29.80 “t/ s;”32.30,184.108.40.206,29.90 “(t=t/20)/s” 1.615,1.558,1.525,1.495,1.
“T^2/ s^2;”2.608,2.426,2.326,2.2 “d^2/ cm^2;”2016.010,1592.010, “T^2d/s^2cm;” 117.099,96.797,81.177,65 graph, also in tabular, use T^2d/s^2cm against d^2/cm^2
=>i ensured dat i avoided zero error on meter rule wen taking my readings.
=>I ensured dat i performed d experiment in a gud atmosphere
=>i ensured dat i took reading of d time of oscillation (t)
(1b)(¡) centre of gravity of an object can be defined as a point on d body through which d whole weight of d object act on.
(1b)(¡¡) check it drawing on ur text book. Center of gravity.
(1b)(¡¡¡) reasons magnitude of the force of attraction of the body to centre of earth shape of d earth.
join our facebook fan page for more information.