Waec 2017 Physics Practical Answers – May/June Expo

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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

=================================

2)

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.-pinloaded.com

bii) impurities increases the temperature range a

substance can exist as a liquid

================

(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

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