DeXtEr Tuesday 11th Nov.
Physics Paper III & II (Objective & Essay) 3hrs 2.00 pm – 5.00 pm

PHYSICS OBJ TYPE A:
1-10: BBCDCCAABC
11-20: CDCCBCBCDD
21-30: EDBCDDDACA
31-40: BACEBBCCEE
41-50: DDBBCADEBC
51-60: BAEAEEABBD

PHYSICS OBJ Type C:
1-10: CCCEEBABDC
11-20: CBBCDEACBB
21-30: BAEEABABDC
31-40: BBCABBDBDC
41-50: ACAECCABBA
51-60: ACADEDBDDB

1A)
To avoid drying and overshooting of the
process
1b)Given;
r=6.6*10^6m
V^2=gr^2/R V=sqroot(2gr) V=sqroot(2*10*6.6*10^6)
V=sqroot(132*10^6)
V=11.5*10^3m/s
132*10^6=(10*r^2)/(6.6*10^6)
871.2*2*10^12=10*r^2 r^2=8712*10^10
r=sqroot(8712*10^10)
r=9.33*10^6m

2a)
Distance,time
2b)
Metre rule,Stop watch
2c)
Wheel of a moving vehicle

3)
Total distance=3000 + 1080 =4080m
Total time=1hr 24mins =3600 (24*60) =3600 1440 = 5040s

4a)
Energy is the ability to do work and power
is the time rate of doing work
4b)
Workdone=Force(f)*Distance(s)
=mg*s =75*10*5 =3750J

6a)
i)Crest is the region of maximum
displacement
Trough is the region of minimum
displacement
ii)Compression is the region of high pressure and area
Rarefraction is the region of low pressure
and area

Q6
i.- the crest is the top of the wave, while trough is the bottom
- crest is the point on a wave with the
maximum value or upward displacement within a cycle .
A trough is the opposite of a crest, so the minimum or lowest point in a cycle.
ii.

9a)
-Electroplating
-Extraction of metal from their ore
9b)Given;
m=350g
t=15mins=15*60
t=900s
m=ZIt
350=3.3*10^-4*I*900 350=0.297I I=350/0.297
=1.18A

13a)
-Pressure
-Presence of impurities
13bi)
This is because the range of the thermometre does not extend to 100 degrees C which is the temperature of
boiling water.
if done the thermometre will break.
13bii)
-The actual volume occupied by gas
molecules is negligible
-The collision between gas molecules are
perfectly elastic
13c)
mass(m)1500kg
Final velocity(v)60km/hr
=60*1000/3600
=16.67m/s
time(t)=30s
i)retardation
(a)=? a=(v-u)/t
a=0-16.67?30
a=-0.56m/s
ii)F=ma
F=1500*0.56
F=833.5N