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## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017 This page contains complete, approved, free, verified, simple waec gce , neco gce past questions 2017 with WAEC GCE Physics Theory Questions & Answers | Physics Specimen, Practical Expo & Apparatus, WAEC Obj & Theory , WAEC Specimen & Practicals 2017.

2017 WAEC GCE Physics Theory Questions & Answers | Physics Practical, Specimen Expo & Apparatus.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

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## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

Question 1B

You are provided with two metre rules, two knife edges, optical pin, a known mass and other necessary apparatus.

• (i) Affix the optical pin at the 50 cm mark of one of the metre rules supplied, with a sellotape / plasticine.
• (ii) Place the rule horizontally on the knife edges such that the knife edges are at the 17.5 cm and 82.5 cm marks. Record the distance D between knife edges.
• (iii) Mount the other metre rule vertically with the retort stand and clamp and place it close to the pin to measure the depressions of the metre rule when the weight M is suspended at its mid-point.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

• (iv) Read and record the position ho of the pointer on the vertically mounted metre rule, with no weight suspended on the horizontal metre rule.
• (v) Suspend M at the midpoint of the metre rule.
(vi) Read and record the new position of the pointer hi’
(vii) Determine the depression of the metre rule H = hj- ho
(viii) Evaluate log H and log D.
(ix) Repeat the procedure with the knife edges set at 20.0cm and 80.0 cm, 22.5 cm and 77.5 cm and 25.0 cm and 75.0 cm marks. Each time read and record the distance D and h1.
• (x) Evaluate the depressions H in each case and log H and 1og D.
(xii) Plot a graph with log H on the vertical axis and log D on the horizontal axis.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

Candidates were expected to:

1. Firstly Read and record ho to at least 1 d.p in cm
2. Read and record four values of D to at least 1 d.p in cm
3. Finally Read and record four values of h1 to at least 1 d.p in cm and in trend

Hottest Trend:

1. As D decreases h1 decreases
2. Determined four values of H =| h1 – ho|
3. Evaluate four values of log H to at least 3 d.p.
4. Evaluated four values of log D to at least 3 d.p.
5. List D, h1,H, log H and log D composite table
6. Distinguish both axes
7. Plot graph using reasonable scales
8. Draw line of best fit.
9. Lastly Evaluate slope.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

State any two of the following precautions e.g.

• Avoided parallax error in reading meter rule
• Avoided draught
• Repeated readings shown on table
• Ensured firm clamping of vertical metre rule
• Ensured knife edges are rigid / firm
• Lastly Ensured that mass was not oscillating / mass was steady

b(i).

Moment of a force about a point is the product of the force and the perpendicular distance of its line of action from the point.

(ii) Using the principle of moments
m(50 – 38) = 60 ( 38 – 16)
12m = 1320
m= 110g.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

QUESTION 2

Using the diagram above as a guide:

• (i) Trace the outline ABC of the equilateral triangular glass prism provided.
• (ii) Remove the prism. Draw a line MN such that it makes an angle i = 5° with the normal at N on side AB of the outline.
• (iii) Fix two pins at PI and P2 on MN. Replace the prism on its outline.
• (iv) Looking through the face BC of the prism, fix one pin at P3 and another at P4 such that they are in a straight line with the images of the pins at PI and P 2′
• (v) Remove the prism and the pins. Draw a line to join P4 and P3. Produce line P4P3 to meet the line BC of the outline at Q and line MN produced at P.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

Observation.

Part (b).

Candidates were expected to
Draw five complete traces showing at least incident ray, emergent ray, from face BC, the normal at N and Q and the intersection of the incident and emergent rays)
Measure and record five values of measured and recorded in degrees and in trend.
Trend: as i increases, e increases.
Measure and record five values of θ to at least 1 d.p in degrees and in trend.
Trend: as i increases, decreases.

• Evaluated five values of = i + e
• List i . in a composite table
• Distinguish both axes
• Plot graph using appropriate scales
• Draw line of best fit
• Evaluate slope and intercept

State two of the following precautions.

1. Ensured pins were vertical / erect
2. Sharp pencil/neat traces (seen from traces)
3. Reasonable spacing of pins (about 4cm apart)
4. Avoided parallax error in reading protractor
5. Lastly Repeated readings shown on the table.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

The expected answers for part (b) are:

b(i) Whenever light travels from air to glass, the ratio of the sine of the angle of incidence to
the sine of the angle of refraction is 1.5[2]
OR
Velocity of light in air is 1.5 times greater than the velocity of light in glass.
OR
n = = 1.5
(ii) n = refractive index
n =
OR
C = sin-1 )
= sin-1
= 37.3o.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

QUESTION 3

Observation
Part (a). This was another popular question among the candidates and satisfactory readings were obtained. The challenges encountered by the candidates were in the plotting of the graph and interpreting it because of the small values got from the evaluation of the reciprocal of I. Precautions are well stated.

Part (b). Most candidates were able to explain the electromotive force of a cell but could not explain how a galvanometer may be adapted to read as an ammeter satisfactorily.

Candidates were expected to:

1. Read and record value of Io to at least 1 d.p in Ampere
2. Evaluate Value of Io-1 to at least 3 s.f.
3. Read and record five values of I to at least 1 d.p in amperes and in trend.

Trend:

1. as R increases, I decreases
2. Evaluate five values of to at least 3 s.f
3. List R, I and in composite table
4. Distinguish both axes
5. Plot graph using appropriate scales
6. Draw line of best fit
7. evaluate slope, intercept and k =

State any two of the following precautions:

1. Key opened when readings are not being taken
2. Ensured clean / tight connections
3. Noted/adjusted/corrected zero error of ammeter
4. Avoided parallax error on ammeter
5. Repeated readings shown on the table.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

The expected answers for part (b) are:
b(i) The electromotive force of a cell is the work done in driving a unit of electric charge round a complete circuit
OR
The electromotive force of a cell is the terminal potential difference across a cell when it does not supply electric current to an external resistor.

## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

OR
The emf of a cell is the total energy per coulomb of charge obtained from a cell

Correct diagram
G = Galvanometer , S = Shunt or low resistor wire

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## WAEC GCE PHYSICS PAST QUESTIONS AND ANSWERS, PRACTICALS 2017

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