CONFIRMED PHYSICS OBJ
1.A 2.C 3.C 4.D 5.A .
6.B 7.A 8.D 9.A 10.B
11.C 12. 13. 14.D 15.D
16.B 17.C 18.D 19.A 20.A
26.A 27.D 28.B 29.B 30.C
31.C 31.A 32.B 34.D 35.A
36.A 37.C 38.B 39.D 40.B
41.C 42.D 43.A 44.A 45.D
46.C 47.C 48.A 49.A 50.C
1a.)Impules=MLT^1
1b.)Acceleration=LT^2
1c.)Work=ML^2T^-2
5.)i. Space travel
ii.Scientific research
iii.Fire work
(5)
-for exploration of space
-it is used for war fare
-it is used for launching of satellite
(6)
(a)doping is the process of producing an impure semiconductor by adding foreign elements to the pure semiconductor
(b)Doping a semiconductor improves the number of charge carriers
(3)
-smoke
-aerosol
-dust particle
(4)
Given flux density(B)=0.217
Force(F)=9.6*10^-12N
Speed(v)=?
F=Bqv
9.6*10^-12= 0.12* 1.6* V
V=(9.6*10^-12)/0.192*10^-19
=50*10^-12+9
v=50*10^7
=5*10^8ms^-1
(2)
Velocity(u)=20ms^-1
Angle(tita)=40 degree
At maximum height, h
V^2=u^2 + 2gh
U^2 sin^2 tita+u
u= 20^2* (sin 40 degree)^2
u=20^2*(sin 4o degree)
u=400* 0.3455
u=138.2ms^-1
(1)
(a)
impulse(I)=F*t
F=ma= m(v/t)= M((d/t)/(t))
f=M(l/T)/T)= MLT^-2
I=MLT^-2 * T
I=MLT^-1
(b)
Acceleration(a)=v/t=(d/t)/t
a=d/t^2= L/T^2= LT^-2
(c)
WOrk(w)=f*d
W=MLT^-2 * L
W=ML^2T^-2
8a) Net force: The net force is the vector sum of all the forces that act upon an object. It is also the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.
8b)
The law of conservation of linear momentum states that the total
momentum of a system of particles remains constant, so long as no
external forces act on the system.
e.g Firing a bullet from a gun or a radioactive nucleus spontaneously emitting an alpha particle.
9a)
i)Foundamental interval: is the value arbitrarily assigned to the difference in temperature between two fixed points (such as the ice point and steam point) on a temperature scale, in order to define the scale.
ii)Thermal equilibrium: is a higher temperature object which is in contact with
a lower temperature object that transfers heat to the lower temperature
object. The objects will approach the same temperature, and in the
absence of loss to other objects, they will then maintain a constant
temperature.
b) Uses of hydraulic press:
- It is used in metal forming operations
- For moulding
ii)
8a) Net force: The net force is the vector sum of all the forces that act upon an object. It is also the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.
9aiii. The value arbitrarily assigned to the difference in temperature between two fixed points (such as the ice point and steam point) on a temperature scale, in order to define the scale.
The difference between the values recorded by a thermometer at two fixed points; for example, the difference between the resistances recorded by a resistance thermometer at the ice point and steam poin
7 -is a cathode ray machine
X is power supply
AC-DC power
Y should be d cathodes
And Z should be d splitter
(6)
(a)doping is the process of producing an impure semiconductor by adding foreign elements to the pure semiconductor
(b)Doping a semiconductor improves the number of charge carriers
(3)
-smoke
-aerosol
-dust particle
(4)
Given flux density(B)=0.217
Force(F)=9.6*10^-12N
Speed(v)=?
F=Bqv
9.6*10^-12= 0.12* 1.6* V
V=(9.6*10^-12)/0.192*10^-19
=50*10^-12+9
v=50*10^7
=5*10^8ms^-1
11a)
Dielectric strength is the property of an insulating material to retain material to retain electrical properties
11bi)
-Infra-red wave
-Geiger muller counter
-Scintillation counter
11bii)
Irradiation of solar energy
11c)
Charge(q)=1.0*10^-19C
Electric field intensity(E)=1200NC^-1
Weight of the oil drop=?
E=F/q
1200=F/1.0*10^-19
F=1200*1.0*10^-19
F=1.2*10^3*10^-19
F=1.2*10^-16N
11d)
R=100ohm, L=0.05H, C=0.25uF
V=220v, f=50Hz
..
11di)
Impedance(z)=sqroot(R^2+(Xl-Xc)^2)
Xl=2*pie*fl
Xl=2*(22/7)*50*0.05
Xl=15.71ohm
Xl=(1/2*pie*fc)
Xc=1/78.55*10^-6
Xc=10^6/78.55
=12730.7ohm
Z=sqroot(100^2+(15.71^2-12730.7^2)
Z=sqroot(10000+2.63*10^16
Z=sqroot(2.63*10^16)
Z=1.62*10^16ohm
11dii)
Vrms=IZ
I=220/1.62*10^16
=1.36*10^-14
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