Waec 2016 May/June 100% Correct Physics Pratical (Alt. A) Question And Answer

3) TABULATE

S/N-E(v)-V(v)-I(A)-V^-

1(v^-1)-I^-1(A^-1)

1-1.50-0.80-0.40-1.250-2.500

2-3.00-1.40-0.70-0.714-1.429

3-4.50-2.00-1.00-0.500-1.000

4-6.00-2.50-1.20-0.400-0.833

5-7.50-3.20-1.50-0.313-0.667

Precautions -I tightened all the wires tightly together

-I ensured clean terminals

-I avoided zero error on the ammeter used

3bi) -By using electric cells

-By using electrostatic method

3bii) For parallel connection=1/R=1/R+1/R 2Rt=R Rt=R/2ohm Total=(R/2)+2 4=(R/2)+2 4=(R+4)/2 8=R+4 8-4=R R=4ohm

1i) Centre of gravity =50.5 TABULATE S/N-A(cm)-B(cm) 1-10.0-51.90 2-15.0-53.50 3-20.0-53.80 4-25.0-54.90 5-30.0-55.80

1xii) -I avoided the effect of draught during the experiment

-I avoided error due to parallax on the metre rule

-I balanced the metre rule horizontally on the knife edge before taking my readings

1bi) Moment of a force about a point is the product of the force and its perpendicular distance from the point to the line of action of the force. i.e moment=force*time and its unit is Nm

1bii) -Sum of forces acting in one direction must equal to the forces acting in another direction.

-The algebric sum of moment acting about a point must be equal to zero ++++++++++++++++++++++++++++++ I PITY THOSE THAT COPY WRONG ANSWERS FROM OTHER SITES. USE OURS IF YOU WERE DIRECTED HERE WE CONFIRM BEFORE DISTRIBUTION.