# 2021 NECO GCE Questions & Answers. PHYSICS PRACTICAL : 2018 NECO GCE ANSWERS. PHYSICS PRACTICAL Night before Exam

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(3a)

In a tabular form

Under S/N

1, 2, 3, 4, 5, 6

Under R(ohms)

5.0, 10.0, 15.0, 20.0, 25.0, 30.0

Under X(cm)

33.00, 49.50, 60.00, 67.00, 71.00, 74.50

Under K = 100 -X(cm)

67.00, 50.50, 40.00, 33.00, 29.00, 25.50

Under Y = x/k

0.4925, 0.9802, 1.5000, 2.0303, 2.4483, 2.9216

(3avi)

DRAW THE GRAPH (3avii)

Slope

R2 - R1/y2 -y1

= 20 - 5/2.0 - 0.5

= 15/1.5

=10.0 ohms

(3aviii)

(i) I must use a freshly charged accumulator.

(ii) I must take proper readings through my resistance box and potentiometer to avoid error due to parallax

(3bi)

Lost volt is the voltage lost due to the internal resistance of a cell.  It is measured in volts.

(3bii)

E = I(R+r)

4 = I(2+0.5)

4 = 2.5I

I = 4/2.5

= 1.6A

2021 NECO GCE Questions & Answers. PHYSICS PRACTICAL (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NECO GCE Questions & Answers. PHYSICS PRACTICAL (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NECO GCE Questions & Answers. PHYSICS PRACTICAL (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NECO GCE Questions & Answers. PHYSICS PRACTICAL (ESSAY, OBJ, THEORY, PRACTICALS ETC)
==

(1aiv)

In a tabular form

Under S/N

1.0, 2.0, 3.0, 4.0, 5.0

Under y(g)

8.00, 10.00, 12.00, 14.00, 16.00

[Under yR(g)= 12.5*y]

100.00, 125.00, 150.00, 175.00, 200.00

Under X(cm)

17.60, 14.00, 11.60, 10.00, 8.70

Under XR(cm) = x * 2

35.00, 28.00, 23.20, 20.00, 17.40

Under L = 70/X

2.000, 2.500, 3.000, 3.500, 4.00

DRAW ANOTHER TABLE OF y(g) and L(cm)

Under y(g)

100.00

125.00

150.00

175.00

200.00

Under L(cm)

2.00

2.50

3.00

3.50

4.00

(1av)

DRAW THE GRAPH

(1avi)

Slope(s) = Dy/DL =

y2 - y1/L2 - L1

Where y2 = 175g, y1 = 100g

L2 = 3.5cm, L1 = 2.00cm

Slope(s) = 175 - 100/3.5 - 2

(1avii)

(i)I ensured mass did not touch/rest on the table

(ii)I avoided error due to parallax on metre rule

(iii)I noted zero error on metre rule

(iv)I avoided draught

(1bi)

The principal of moments state that if a body is in equilibrium,then the sum of the clockwise moments about any point on the body is equal to the sum of the anticlockwise moments about the same point

(1bii)

Draw the diagram

Taking moments about point B ie CWM = ACM

(FA*7) = 10*2

7F = 20

7F/7 = 20/7

F = 2.9N

= 75/1.5

= 50g/cm

2021 NECO GCE Questions & Answers. PHYSICS PRACTICAL (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NECO GCE Questions & Answers. PHYSICS PRACTICAL (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NECO GCE Questions & Answers. PHYSICS PRACTICAL (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NECO GCE Questions & Answers. PHYSICS PRACTICAL (ESSAY, OBJ, THEORY, PRACTICALS ETC)
==

2bi) I Rainbow

II Wave length

2v)

​SLOPE​

Slope,s =y2-y1/x2-x1

=56.7-20/4-1

=36.7/3

=12.233

=12.23

2vi)U = 100/S = 100/12.23

= 8.176

=8.18

2vii)

– I will avoid error due to parallax while reading the meter rule.

-I will ensure the mass is kept dried before weighing

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Updated At: May 11th 2021, (05:05:45)