NECO Physics Practical Questions and Answers 2020/2021 (Complete Solution)

NECO Physics Practical Questions and Answers 2020. Many NECO candidates find it difficult to answer the NECO Practical Physics correctly due to not understanding the questions. I will show you the best way to answer NECO Physics Practical questions and make a good NECO result in your Physics examination.

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You need to understand the NECO Physics Practical marking scheme before attempting any question so as to present your answers in such a way that it will look attractive to the examiner to earn you big marks.

Bear it in mind that every single procedure is awarded marks. So, ensure you do not skip any step while reporting and presenting your practical results. And do not forget to remember that the units are very important.

The Physics Practical question paper will consist of three areas and general Physics questions namely:

  1. Optics
  2. Electricity
  3. Mechanics

You will be expected to carry out an experiment, take readings and tabulate your values, plot graph, state precautions taken during the experiment, and report observation.

What you will see will not be far from the NECO Physics Specimen given to your school.

Note: Ensure you avoid parallax error while taking your readings to get accurate results and do not forget to choose lines of best fit while plotting the graph. It is not compulsory that all the points will enter the line.

WAEC Practical Physics Questions and Answers

Note: The 2020 WAEC Practical Physics answers (expo) will be posted here on the day of NECO Physics Practical exam. Keep checking and reloading this page to know when the answers are posted. Do not forget to reload this page in order to see the answers.

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NECO Physics Practical Specimen

PHYSICS PRACTICAL SPECIMEN:

QUESTION 1
-Knife edge
-Meter rule
-100g and 150g masses
-Thread
Question 2
-Four thumb pins
-Four optical pins
-Drawing paper
-Drawing board
-Rectangular glass prism
Question 3
-Plug key
-Connecting wires
-Ammeter (0.2A or 0-3A)
-Voltmeter (0-3V) (gistpower.com)
-2Ω standard resistor covered and labeled Q
-Jockey
-2 × 15V dry Leclanche cell or 2V Accumulator
-1.2 constantan wire (SWG 26)
-Crocodile clip.

The questions below are for practice not the 2020 Physics Practical questions.

1(a)

You are provided with two retort stands, two metre rules, pieces of thread and other necessary apparatus. (i) Set up the apparatus as illustrated above ensuring that the strings are permanently 10cm from either end of the rule.

(ii) Measure and record the length L = 80cm of the two strings.

(iii) Hold ends of the rule and displaces the rule slightly, then release so that it oscillates about a vertical axis through its centre.

(iv) Determine and record the time t for 10 complete oscillations. (v) Determine the period T of oscillations.

(vi) Evaluate log T and log L. (vii) Repeat the procedure for four other values of L = 70cm, 60cm, 50cm, and 40cm.

(viii) Tabulate your readings.

(ix) Plot a graph with log T on the vertical axis and log L on the horizontal axis.

(x) Determine the slope, s and the intercept, e on the vertical axis, of the graph.

(xi) State two precautions taken to ensure accurate results.

(b)(i) Define simple harmonic motion

(ii) Determine the value of L corresponding to t = 12s from the graph in 1 (a).

2(a) You are provided with a beaker, a thermometer, a stirrer, stop watch/clock, measuring cylinder, table salt, water and other necessary materials.

(i). Measure 200cm3 of water into the beaker.

(ii). Heat the water until it boils steadily for about 2 minutes

(iii). Read and record the boiling point bo.

(iv). Add table salt of mass M = 10.0g to the boiling water and stir continuously until another boiling point bi is attained.

(v). Read and Record bi.

(vi). Evaluate θi = (bi – bo )

(vii) Using the same mixture, repeat the procedure four more times by adding 10.0g of salt each times to give the cumulative mass Mi of salt as 20g. 30g. 40g. and 50g.

(viii) in each case, allow the mixture to boil steadily for at least 2 minutes then read and record the boiling point bi.

(ix). Tabulate your readings

(x). Plot a graph with Mion the vertical axis and θi on the horizontal axis.

(xi). Determine the slope, s, of the graph.

(xii). State two precautions taken to ensure accurate results.

(xiii). Define the boiling points of a liquid

(xiv). What effect do impurities have on the boiling point of a liquid?

3(a) You are provided with cells, a potentionmeter, an ammeter, a voltmeter, a bulb, a key, a jockey and other necessary materials.

(i) Measure and record the e.m.f. E of the battery

(ii) Set up a circuit as shown in the diagram above.

(iii) Close the key K and use the jockey to make a firm contact at J on the potentiometer wire such that PJ = x = 10cm.

(iv) Take and record the voltmeter reading V and the corresponding ammeter reading I.

(v) Evaluate the log V and log I.

(vi) Repeat the procedure for five values of x = 20cm, 30cm, 40cm, 50cm, and 60cm,

(vii) Tabulate your readings,

(viii) Plot a graph with log I on the vertical axis, and log  V on the horizontal axis.

(ix) Determine the slope s, of the graph.

(x) Determine the intercept c, on the vertical axis.

(xi) State two precautions taken to ensure accurate results.

(b)(i) How is the brightness of the bulb affected as x increases? Give a reason for your answer.

(ii) List two electrical devices whose actions do not obey Ohm’s law.

PHYSICS PRACTICAL ANSWERS

1(a)(iii) Table of reading

S/NL(cm)L(m)T1(s)T2(s)t(mean)T = t/nLog TLog L
1800.811.111.211.151.120.05-0.10
2700.710.510.510.501.050.02-0.15
3600.69.89.79.750.98-0.01-0.22
4500.58.78.78.700.87-0.06-0.30
5400.47.77.77.700.77-0.11-0.40

(x)

Slope = ΔlogT/ΔlogL = LogT2 – LogT1/LogL2 – LogL1 = 0.098-(0.10)/0.00 – (-0.38)

= 0.098 + 0.10/0.00 + 0.38 = 0.198/0.38 = 0.52

The intercept, C on the vertical axis = 0.99

(I) I ensured strings were tight

(II) I avoided parallax error on metre rule

(III) I ensured smooth and regular oscillation in a horizontal plane.

(b)(i) Simple harmonic motion is the motion of a body whose acceleration is always directed towards, a fixed point and is directly proportional to the displacement from the fixed point.

(ii) T = t/n = 12/10 = 1.2s

;log 1.2 = 0.079

The value of LogL = 0.035 = 0.04

L = 1.1

GRAPH

  1. Table of reading

bo = 98oC

S/Nm(g)bi(oC)θi = (bi-bo)
1101002.0
2201024.0
3301046.0
4401068.0
55010810.0

(xi) Slope = Δmi/Δθi = mi2 – mi1/θ2 – θ1 = 50-5/10-1.0 =  45/9 = 5

(I) I ensured that the water was stirred gently

(II) I avoided parallax error on the thermometer and stopwatch; (III) I avoided zero error on stop watch.

(b) (i) This is the temperature of a liquid at which is saturated vapour pressure equals the external atmospheric pressure.

(ii) impurities raise the boiling point of a liquid.

GRAPH

  • Table of reading
S/NI(cm)I(A)V(v)Log1LogV
110.00.060.20-1.22-0.70
220.00.120.35-0.92-0.50
330.00.150.45-0.82-0.35
440.00.180.50-0.75-0.30
550.00.240.65-0.62-0.19
660.00.270.80-0.57-0.09

(ix)

Slope = ΔlogI/ΔlogV = logI2 – logI1/logV2 – logV1 = -0.28 – (-1.22)/0.1 – (-0.7)

= -0.28 + 1.22/0.1 + 0.7 = 0.94/0.8 = 1.175

(x) the intercept on the vertical axis = -04

(xi) (I) I opened tight terminals;

        (II) I opened key when reading was not taken

(b)(i) Brightness of the bulb increases

Reason: Voltage across and current through the bulb increases

(ii) (a) Diode; (b) Transistor; (c) Filament bulb (d) Capacitor

GRAPH

If you have any question about the NECO Physics Practical questions and answers, kindly let us know in the comment box.

Last Updated on October 17, 2020 by Admin

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