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WAEC 2017: 100% Verified Physics Practical Questions and Answers
WAEC April 1, 2017 • 4 years ago • No Comment Yet

WELCOME TO EXAMRELIEF WAEC 2017 ANSWERS PAGE!!

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KEEP REFRESHING THIS PAGE FOR THE COMPLETE ANSWERS AS WE ARE TYPING IT


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2017 WEAC (PHYSICS PRACTICAL) 100% VERIFIED SPECIMENS

PHYSICS SPECIMENS

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QUESTIONS 1
Two retort stand;
Two metr rules;
Pieces of thread 100cm each;
Stop watch;

QUESTIONS 2
Beaker (0-500cm^3);
Water;
Measuring cylinder (250 cm^3);
Thermometer (0-200degreeC);
Stirrer;
Tripod stands with wire gauze;
Bunsen burner/source of heat;
Stop watch/clock;
Table salt/common salt 50g;

Also Read: 2017 JAMB CBT: How to Score 250 – 270+ In Upcoming 2017 Jamb CBT Exam [CLICK HERE TO SUBSCRIBE]

NOTE: The table salt should be made available in 10g x 5 places for each candidate.
Otherwise, an electronic balance should be provided.

QUESTIONS 3
Two dry cells of 1.5V each;
Plug key;
Potentiometer;
Ammeter (0-5A);
Voltmeter (0-5V);
Jockey;
Small bulb (Torch light);
Ten connecting wire;

2017 WEAC (PHYSICS PRACTICAL) 100% VERIFIED QUESTIONS

?WAEC 2017 PHYSICS PRACTICAL ANSWERS?

100% VERIFIED PHYSICS PRACTICAL ANSWERS

NOTE: ^ means raise to power
1)
TABULATE:
i:1,2,3,4,5,
L(cm):80.00,70.00,60.00,50.00,40.00
t1(s):17.87,16.22,16.09,14.08,13.28
t2(2):17.56,16.46,15.09,14.77,13.36
t(s)mean:17.715,16.340,15.590,14.425,13.320
T(t/10)s:1.7715,1.6340,1.5590,1.4425,1.3320
LogT(s):0.2483,0.2133,0.1928,0.1591,0.1212
Log L(cm):1.9031,1.8451,1.7782,1.6990,1.6021
Log T*10^-2(s):24.83,21.33,19.28,15.91,12.12
Log L*10^-1(cm):19.031,18.451,17.782,16.990,16.021
SLOPE(s)=(LogT2*10^-2 – LogT1*10^-2)(/Log L2 *10^-1 – LogL1*10^-1)
=(21.33-12.12(s))*10^-2/(18.50-16.02(cm)*10^-1)
=3.714*10^-1
=0.3714cm^-1
1axi)
i)ensured supports of pendula were rigged
ii)avoided parallax error on meter rule/stop watch
1bi)
simple harmonic motion is the motion of a body whose acceleration is always direct towards a fixed point and is proportional to the displacement from the fixed points
1bii)
T=1.2secs
Log 1.2=0.079
0079 shown on graph with corresponding Log L read L correctly determined
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CLICK HERE TO VIEW NO. 2 TABLE
2b)
bi)The boiling point of a liquid is the temperature
at which the vapor pressure of the
liquid equals the pressure surrounding the liquid
and the
liquid changes into a vapor.
OR
2bii)
The boiling point of water can also be changed by adding impurities in the water. Impurities include salt, sugar, and other dissolving molecules. Generally, impurities increase the boiling point of water. A simple explanation of this is that the impurities dilute the concentration of water (the number of water molecules per unit volume decreases), and the number of molecules that can vaporize at any give temperature decreases. The result is that a higher temperature is required to achieve the same vapor pressure.
bii) impurities increases the temperature range a
substance can exist as a liquid
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CLICK HERE TO VIEW NO. 3 GRAPH
3a)
TABULATE
x(cm):10,20,30,40,50,60
V(v):0.65,0.75,1.00,1.20,1.45,1.55
I(A):0.20,0.30,0.35,0.40,0.45,0.55
LogV(v):-0.187,-0.125,0.000,0.079,0.161,0.190
LogI(ohm):-0.699,-0.523,-0.456,-0.396,-0.391,-0.360
SLOPE(s):=( LogI2-LOgI1)/(LogV2-LogV1)
=-0.2-(-0.7)/0.3-(-0.2)
=0.5/0.5
=1AV^-1
the emf of the battery is= 3.0v
3axi)
i)ensured clean/tight terminals
ii)open key when reading was taken
3bi)
i)brightness of the bulb increases
ii)voltage/current through the bulb increases
3bii)
i)diode
ii)transistor
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