Nabteb 2016 Physics Practical Answers – May/June Expo - Gidifans

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1i)
TABULATE
s/n, L(cm), t1(s), t2(s), t=t1+t2/2(s), T(s), 100T, log100T, logL
s/n 1, 2, 3, 4, 5
L(cm) 90.00, 85.00, 80.00, 75.00, 70.00
t1(s) 9.20, 8.90, 8.65, 8.20, 7.65
t2(s) 9.30, 9.00, 8.45, 8.10, 7.54
t=t1+t2/2(s) 9.25, 8.95, 8.55, 8.15, 7.59
T(s) 0.463 0.448 0428 0408 0379
100T 46.30 44.80 42.80 40.80 37.90
log100T 1.666 1.653 1.634 1.613 1.579
logL 1.954, 1.929, 1.903, 1.875, 1.845,
1x)
slope,S=change in log100T/change in logL
1bi)
couple is an occurence when two equal but oppositely directed parrallel force not acting straight line.
Moment of a couple is define as the product of the force and perpendicular distance between the line of action of the two forces
1bii)
Relationship:R=Mg+Mg
1biii)
centre of gravity of a body is the point at which its resultant weight seems to act.
Stability of an object depends on the position of the centre of gravity.
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2i)
TABULATE
S/n, L(cm), H(cm)
S/n 1, 2, 3, 4, 5
L(cm) 1000 1500 2000 2500 3000
H(cm) 7.50, 11.25, 15.00, 18.75, 22.50
2vii)
slope,S=
2bi)
total internal reflection of light occures when light travels from a dense medium to a less dense medium so that the angle of incidence (in the dense medium) is greater than critical angle
2bii)
conditions
i)the angle of incidence from the denser medium must be greater than the critical angle
ii)the light rays must come from a denser medium to a less dense medium
iii)real depth=6cm, u=1.5, App. dept=d,
u= real dept/Apparent dept => 1.5=6/6-d
1.5(6-d)=6=>9-1.5d=6
9-6=1.5d
d=3/1.5=2.0cm
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3a)
TABULATE
S/n 1, 2, 3, 4, 5, 6
L(cm) 10.00, 20.00, 30.00, 40.00, 50.00, 60.00
I(A) 0.60, 0.50, 0.45, 0.40, 0.35, 0.30
I^-1(A^-1) 1.667, 2.000, 2.222, 2.500, 2.857, 3.333
3ix)
slope =change in L/change in I^-1
intercept
3x)
when L=0, I^-1=
3xi)
i)i ensure that parallax error is avioded when reading the armeter
ii)i ensure clean terminals and tight connections to get acurate results
3bi)
jockey contact with potentiometer wire at C means L =100cm while I^-1=1 I=
3bii)
reasons
i)to aviod successive increase in the resistance of the wire.
ii)to aviod the cells from being run down
3biii)
i)generator
ii)dynamo
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3 Comments
  1. samzy says:

    tnkz gidi ur dah best

  2. ninfa dangkum says:

    expo

  3. Aminu says:

    anytime I aks for expo

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