CORRECT: 2016/2017 WAEC WASSCE Physics Practical (Alternative) Questions And Answer Expo/Runs

PHYSICS PRACTICAL:
1)
S/N: 1 , 2 , 3 , 4 , 5 , 6
V(cm): 10.00 , 15.00 , 20.00 , 25.00 , 30.00 , 35.00
U(cm): 47.00 , 48.00 , 50.00 , 51.50 , 53.00 , 54.00

1a) Slope = Change in Y/Change in X
= Y2 - Y1 / X2 - X1
= 51.50 - 50.00/25.00 - 20.00
= 1.50/5.00
= 0.30
Ki = (1 - 2S / S)100
= (1 - 2 x 0.30 / 0.3)100
= 1.33
K2 = 2C/S - 160
= 2x44.50/0.3 - 160
= 136.67

1x)
* I ensure that I avoides paralax error when taking from the meter rule

* I ensure that I avoided drought to prevent sw?ngling of the mass

1bi)
The condition under which rigid body remains in equilibrum when acted upon the three non parallel coplanner forces are
I) The force must be corrected ie they must meet at point
II) The resultant force must be equal to Zero
III) The force

can be represented in magnitude and direction by sides of a triangular.

1(a)
Precautions
i I avoided drought to prevent swinging of the mass Q
ii I avoided parallax error in reading the metre rule
iii I avoided that the mass did not rest on the table

(1) b(i)  Moment  of a force about a point is the product of the force sF and the perpendicular distance from the point to the line of force.
Example opening  of door, turning of tap,riding of bicycle.


1 b(ii) (a) The principle of moment states that if a body is in equilibrium the the sum of the clockwise turning moments acting upon it about any point equals the sum of the anticlockwise turning moment about the same point.


(b) The term equilibrium meabs that when a body acted on by several forces and it does not accelerate or rotate, it is said to be at equilibrium.

2bi)Heat Capacity: is the amount of heat required to change its temperature by one degree, and has units of energy per
degree.

(3a)
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

GOOD LUCK