Neco Gce Physics Answers – Nov/Dec 2018 Expo

Physics OBJ:
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11BBBADDCBCB
21DDDEDADABB
31BEDBACDEED
41BDCAADCCEE
51ACADEBBCEB

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(10a)
Surface tension is the force acting along the surface of a liquid,causing the liquid surface to behave like a stretched elastic skin

(10b)
-Adhesion is the force of attraction between molecules of different kinds eg the molecules of water and glass

-Cohesion is the force of attraction between molecules of the same kind eg The molecules of water

(9ai)
-Gravitational field is a convenient and informative method of describing the gravitational attraction of one body for another at a distance
-Magnetic field is the region or space around the magnet in which the influence of the magnet can be felt or detected
(9aii)
Similarities
Gravitational field and Magnetic field are both force field

(9b)
(i)Iron filing

(ii)Magnetic compass needle

(1ai)
An Artificial Satellite is an artificial object that is manufactured by humans and launched into the Earth’s orbit or in another planet’s orbit.
(1aii)
A multistage rocket consists of two or more sections called stages. Each state has a rocket engine and propellant.A rocket is multistage because Rocket travelling to space requires more than one engine. The reason is because it will require much large amount of fuel or propellant to gain the speed required to escape earth gravity

(1b)
(i)Objective lens:-Objective lens collects parallel rays from a distant object and forms a real inverted and diminished image at the principal focus of the lens

(ii)Eyepiece:-Eyepiece acts as a magnifying glass and forms a magnified and virtual image

(6a)
Convex mirror is used as driving mirror of cars because they give an erect image of an object behind the driver

(6b)
velocity = 0.42m
Frequency = 6Hz
Distance =?
V=FX
X=V/F

X= 0.42/6 =0.07m

(8a)
(i)Length of the conductor

(ii)cross section area of the conductor

(8b)
I=E/R+r
E=12r , r=1.2n , R=4.0n
I=12/1.2+4=12/5.2

=2.31A

(12a)
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

(12bi)
A projectile is any object thrown into space by the exertion of a force.
(12cii)
(i)a bullet fired from a gun
(ii)a stone release from catapult

(12c)
Centripetal force is defined as, “The component of force acting on a body in curvilinear motion that is directed toward the center of curvature or axis of rotation,” while centrifugal force is defined as, “The apparent
force , equal and opposite to the centripetal force , drawing a rotating body away from the center.

(12d)
Taking moment about D
Sum of ( moment )= moment
Rc * 17 = 20*12

Rc = 20*12/17= 14.117

(5a)
Heat Capacity (Cp) of a body is the quantity of heat required to raise the temperature of the body by 1 Kelvin.

(5b)
m=5kg, I=3.3610^5Jkg^-1
H=5
3.3610^5J
H=16.8
10^5J

(3a)
Amplitude of a simple harmonic motion is defined as the maximum distance that an object moves from its equilibrium position.

(3b)
-Speed-
(i)Speed is how fast an object is moving.
(ii)It is calculated by the displacement of space per a unit of time.
(iii)speed does not deals on direction
-Velocity-
(i)Velocity is the rate at which an object changes position in a certain direction.
(ii)It is calculated by the displacement of space per a unit of time in a certain direction.
(iii)Velocity deals with direction

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