Neco GCE 2017 Physics Theory and Obj Answers
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-Regular maintenance is essential to keep machines and the work environment safe and reliable.
-It helps to eliminate workplace hazards.
Electrolysis can be used for electroplating of metals. expand in length by a fraction
A couple is a pair of forces, equal in magnitude, oppositely directed, and displaced by perpendicular distance or moment.
i)The forces exerted by one’s hand on a screw-driver
ii)The forces exerted by the tip of a screw-driver on the head of a screw
critical angle is the angle of incidence beyond which rays of light passing
through a denser medium to the
surface of a less dense medium
are no longer refracted but totally
-Light travels as transverse waves and can travel through a vacuum.
-Sound travels as longitudinal waves and needs to travel through a solid, liquid or gas.
i)wrapping the coil around an iron core.
ii)adding more turns to the coil.
iii)increasing the current flowing through the coil.
i)they dont move around
ii)they are rigid and dont flow
i)liquids slosh around
ii)the maintain the shape of their container
ii) The upthrust of the fluid to which it fluts
Draw a table
i) Reducing the contact between the surfaces.
ii) Application of grease
total distance travelled
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– The body tube
– The launch lug
– Broadcasting: This involves mainly television broadcast
– Internet and multimedia: This involves communication and exchange of information through the internet
object distance for eyepiece, u=3.0cm
Final image distance v=?
Focal length of eyepiece f=5cm
Using mirror/lens formular
Multiply through by 15v
The image is virtual and 7.5cm from the eyepiece on the same side of the eyepiece as the object
-Book lying on table
-A car engine that keeps running for a constant for a considerable length of time
Ship floats in water,although they are made of steel and iron which are materials denser than water. This Is because the ship is hollow I.e an open object
Specific latent heat of vaporization ( L ) of a substance is the quantity of heat required to change unit mass of the substance from it’s liquid at boiling point to vapor without a change in temperature
– Kinetic energy is the energy due to motion while potential energy is the energy at rest due to it’s level or position
– kinetic energy is an horizontal energy while potential energy is a vertical energy
– Kinetic energy is denoted by k.E while potential energy is denoted by P.E
– Kinetic energy does not act against gravity while potential energy acts against gravity
Wave front is a line or surface in the path of advancing wave on which all d particles are in the same phase or state of disturbance
-Plane wave front
– Spherical or circular wave front
– Pupil:The pupil serves as the passage for light into the eye
– Shutter:The Shutter works on the stimulation of light before photograph can be taken
-Screen of pinhole camera: It helps to form images which are inverted
12ai) Newton’s second law of motion states that the rate of change of momentum is proportional to the impressed fotvr and takes place in the direction of the force
– The motion of the strings in a musical instrument eg. Guitar
– The motion of the balance wheel of a watch
Resultant force is that single force which acting alone will have the same effect in magnitude and direction as two or more forces acting together
Equilbrum force is that single force which will balance all the other forces taken together. It is equal in magnitude buy opposite in direction to the resultant force
Resultant force F =root4^2 + 3^2
F =root16 + 9
Using F = m(v – u) / t
5= 5.5 (v – 2) / (5 × 60)
=5 × 60×5 = 5.5(V-2)
5.5(V – 2) = 1500
V – 2 = 272.7
V=272.7 + 2
Final velocity of body is = 274.7m/s
– Solar energy is for providing a cheap and clean source of hot water supply.
– Solar energy provides electricity supply
-Renewable energy are those that can be replaced as they are used up. They can be continually replenished as they are exploited and utilized while Non-Renewable energy are those that cannot be replenished as they are used up
-Examples of renewable energy are Solar energy, wind energy, Biomass and Bio feuls while examples of Non renewable energy are Coal and wood, Fossil fuel, Petroleum and Natural gas, Nuclear energy
The principle of conservation of linear momentum us also utilized in the propulsion of jet aircraft. Gases are burnt within the combustion chambers of the engine. As jets of hot gases are expelled downwards through the tail nozzle at very high speeds from the aircraft, an equal and opposite momentum is given to the rocket or aircraft which then moves forward
Heat lost H=4200J
Initial temperature tita1=100C
Final temperature tita2=?
SHC of water Cw=4200j/kg/k
A transverse wave is one which travels perpendicularly to the direction of vibrations producing the wave
-Light waves do not need a material medium for its propagation but sound waves does
-Light waves cannot be plane polarized but sound waves can
Given y=4sin(1000pie*t/landa + 0.5x)
Comparing with y=Asin(2pie ft +2pie/landax)
Hence wavelength, landa=12.56cm
Coulomb’s law state that magnitude of the electrostatic force of attraction between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them
Let equivalent resistance be R
1/R = 1/R1 + 1/R2 + 1/R3
I/R = R2R3 + R1R3 + R1R2 / R1R2R3
R= R1R2R3 / R1R2+R2R3+R1R3
200Ω C =4mf f=50h2 π =3.14
Impedance Z =√R^2 + (1/2Ω + c) ^2
Z =√200^2 + (1/2×3.145×50×4×10^-6)^2
Z=√200^2 + 796.178^2
Z=√40000 + 633900