Neco GCE Physics Question and Answer 2021

Neco GCE Physics Question and Answer 2021

 
(2a)
(i) Planets revolving around the sun
(ii) Satellites orbiting around planets
(2b)
Mass is the measure of the amount of matter present a body. While weight refers to the measure of the amount of force that acts on mass because of the pull of gravity.
===========================
(3i)
Given;
M = 40g
K = 0.5Nm-¹
Period T=?
T = 2π √m/k
T = 2π √40/0.5
T = 56.2seconds
(3ii)
Frequency = 1/T
F = 1/56.2
F = 0.0178Hz
===========================
(5a)
(i) Coal is potentially radioactive:
Other than abundant levels of carbon dioxide, coal also produces sufficient levels of outward radiation. These radiations are carcinogenic in that they cause cancer and cell mutations. The use of safety gear is one way of achieving this desirable end.
(ii) Coal destroys natural habitats:
In extracting coal for heating and industrial use, the habitats of plants and animals inevitably get destroyed. The situation is compounded by fire outbreaks that are more likely to arise in extracting the coal. This may pose extreme damages to the nearby infrastructure.
(5b)
-ELASTIC COLLISION-
(i) Elastic collision is whereby two colliding objects do not stick together; they bounce back without undergoing any deformation or heat generation.
(ii) In elastic collision, the momentum and total kinetic energy before and after collision is same.
(iii) The forces involved during elastic collision are conservative.
(iv) In elastic collision, mechanical energy is not transformed into other energies such as sound energy or thermal energy.
-INELASTIC COLLISION-
(i) Inelastic collision is a kind of collision whereby the two colliding objects stick together and move with the same post-collision speed.
(ii) In inelastic collision, the momentum and total kinetic energy before and after collision is not same.
(iii) The forces involved during inelastic collision are non-conservative.
(iv) In inelastic collision, mechanical energy is transformed into other forms of energy such as sound energy and thermal energy.
===========================
(8a)
(i) Extraction and Refining of Metals:
In the process of refining of metals the impure metal extracted from its ore is made anode, the salt of the metal is made electrolyte. Pure metal deposits on the cathode.
(ii) Production of chemicals:
During the process of electrolysis of brine, chlorine is given off. at one pole at anode and hydrogen at the other at cathode leaving caustic soda in the cell.
(8b)
A conductor is described as a material that permits electrons to flow freely and easily from one particular to another in one or more than one directions. While an Insulator is a material that does not permit electrons to flow freely.
===========================
(14a)
Accommodation is the ability of the eye to alter or adjust the focal length of its lens so as to form clear images of objects at different distances on its retina
(14b)
A convex mirror has a wide range of view
(14c)
Diagram
(14d)
Comparing; y= 5sin(500πt – 2.5x)
With y = Asin(2πft – 2πx/λ)
(i) 2πf = 500π
2f = 500
f = 500/2 = 250Hz
(ii) 2π/λ = 2.5
λ = 2π/2.5
λ = 2(3.14)/2.5 = 2.512m
 

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