9/15/2016

WAEC GCE 2016 EXPO: Physics Objective Theory Questions And Answers

Today's examination papers
Physics

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PHY.
1.ABDCCCDBCA
11.DBCAABBCAD
21.BBDCDBABDC
31.ABABDDDCBD
41.AACDABDAAD




11b) Farad is the standard unit of capacitance in the International System of Units (SI), formally defined to be the capacitance of a capacitor between the plates of which there appears a potential difference of one volt when it is charged by a quantity of electricity equal to one coulomb. Symbol: F. Origin of farad Expand.
=====================================
11a)
-the number of turns in the coil
-the strength of the magnet
11b) Farad is the standard unit of capacitance in the International System of Units (SI), formally defined to be the capacitance of a capacitor between the plates of which there appears a potential difference of one volt when it is charged by a quantity of electricity equal to one coulomb. Symbol: F. Origin of farad Expand.




Use diz 11 a nd b

7)The effect of Doping a Semiconductors. The addition of a small percentage of foreign atoms in the regular crystal lattice of silicon or germanium produces dramatic changes in their electrical properties, producing n-type and p-type semiconductors. Pentavalent impurities.

SECTION B:
(Answer three)

(11a)
-Number of turns in the coil
-Area of coil

(11b)
Farad is a capacitor of a unit charge when a unit of voltage drop is applied

(11ci)
The brightness of the bulb remains the same since the same current will flow through them

(11cii)
(a)The resistor should be connected in parallel with the galvanometer

(b)
VR=Vg
I*R=0.05I*Rg
IR=0.05I*100
IR=5I
R=5I/I
R=5ohm

(11di)
I=40sin5w(pie)t
but I=Iosin2(pie)ft
therefore 2(pie)ft=500(pie)t
2f=500
f=500/2
f=250Hz

(11dii)
Io=40amp

11diii)
Ir.m.s=Io/sqroot2
=40/sqroot2
Ir.m.s=28.3amp


(10a)
-Sound wave is mechanical wave while light wave is electromagnetic
-Sound wave is longitudinal wave while light wave is transverse wave
-Sound wave cannot be plane polarized while light wave can be plane polarized

(10bi)
DRAW THE DIAGRAM

(10bii)
Nature=>It is a real image and inverted
Position=>It is at 2f on the other side
Size=>It has the same size of the object

(10c)
Because the light ray travel on a straight line ie rectilinear propagation of light rays

(10d)
u=36m=3600cm
hi=2.5cm
v=0.30cm

(i)m=v/u
m=0.3/3600
m=0.000083

(ii)m=hi/ho
ho=hi/m
ho=2.5/0.000083
ho=30120cm
ho=301.2m

(iii)
1/f=1/u+1/v
1/f=1/3600+1/0.3
1/f=0.00028+3.33333
1/f=3.33361
f=0.3cm
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