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Waec 2017 Physics (Alternative A) Practical Answers – May/June Expo

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VERIFIED WAEC PHYSICS PRACTICAL QUESTIONS

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

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Log L *10 ^ -1 ( cm) : 19 . 031 , 18 . 451 , 17 . 782 , 16 . 990 , 16 . 021

SLOPE ( s )= ( LogT2 * 10 ^ – 2 – LogT1 * 10 ^ – 2 ) ( / Log L 2 * 10 ^ – 1 – LogL 1 * 10 ^ – 1 )

= ( 21 . 33 – 12 . 12 ( s ))* 10 ^ – 2 /( 18 . 50 – 16 . 02 ( cm)* 10 ^ – 1 )

= 3 . 714 *10 ^ -1

= 0 . 3714 cm^ – 1

1 axi )

i) ensured supports of pendula were rigged

ii ) avoided parallax error on meter rule / stop watch

1 bi)

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

1 bii)

T = 1 . 2 secs

Log 1 . 2 = 0 . 079

0079 shown on graph with corresponding Log L read L correctly determined

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

2 b )

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 .

bii) impurities increases the temperature range a

substance can exist as a liquid

3 axi )

i) ensured clean / tight terminals

ii ) open key when reading was taken

3 bi)

i) brightness of the bulb increases

ii ) voltage / current through the bulb increases

3 bii)

i) diode

ii ) transistor

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

=0.5/0.5

=1AV^-1

 

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Myedujobnews Official

Adeyemo Adewale Ayomide is the founder and editor of MyEduJobNews. He loves to share education news from various sources to keep readers informed.

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About Author

Myedujobnews Official

Adeyemo Adewale Ayomide is the founder and editor of MyEduJobNews. He loves to share education news from various sources to keep readers informed.

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