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WAEC GCE Physics Essay and Objective Complete Correct Questions and Answers 2020/2021 for January/February first series expo Complete Questions and Answers runz posted for free now available for free download. We are here to offer you the latest legit, correct, verified early answers on Physics Obj And Essay 6hours before your exam starts. In other to Get our legit 100% solutions for WAEC GCE Physics Obj And Essay Answers, You have to subscribe for it by following the Procedure bellow.

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WAEC GCE PHYSICS EXAM HAS BEEN SCHEDULED TO TAKE PLACE ON

Table of Contents

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Monday 27th January, 2020

  • Physics 2 (Essay) › 9:30 am – 11:00 am
  • Physics 1 (Objective) › 11:00 am – 12:15 pm

==> (1a)
Q= 1/2 ev²
dimension for Q = M/L³ * L/T * L/T
=M/L * I/T²
=ML-¹T-²

(1b)
Mass flow rate

(2)
Given Range R = 7200
Using R max = u²/g
7200= u²/10
U²=72,000
U=√72000
U=268.3m|s
The missle should be launched at a speed of 268.3m|s

(3)
(i) Astronomical satellite
(ii) Weather satellite
(iii) communication satellite

(4)
(i)origin up to a point A
(ii)origin up to B (the elastic unit )
(iii)the yield point is point C

(5a)
Optical fiber is used as a medium for telecommunication and computer networking because it is flexible and can be bundled as cables. It is especially advantageous for long-distance communications because infrared light propagates through the fiber with much lower attenuation compared to electrical cables.

(5ci)
Pascal’s law is a principle in fluid mechanics given by Blaise Pascal that states that a pressure change at any point in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere

(5cii)
a) Hydraulic Lift: The image you saw at the beginning of this article is a simple line diagram of a hydraulic lift. This is the principle of working of hydraulic lift. It works based on the principle of equal pressure transmission throughout a fluid (Pascal’s Law).

b) The construction is such that a narrow cylinder (in this case A) is connected to a wider cylinder (in this case B). They are fitted with airtight pistons on either end. The inside of the cylinders is filled with an incompressible fluid.

(5ciii)
(i) Complete Submersion
The buoyancy force on a completely submerged object of the volume is
F

B

V
ρ
g
.
(ii) Buoyancy and Archimedes’ Principle
The buoyant force on an object can be calculated using the Archimedes principle.

(9a)
(i)Humidity is the concentration of water vapour present in the air.
(ii) Saturated vapour can be defined as a state where the system is holding the maximum amount of water in vapour (gaseous form) at a corresponding temperature and pressure.

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(9bi)

Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporization.

(9bii)
Water pipes burst because the water inside them expands as it gets close to freezing, and this causes an increase in pressure inside the pipe. When the pressure gets too high for the pipe to contain, it ruptures.

(9biii)
(i)They travel linearly.
(ii)They have a negative electric charge.
(iii)They have particle property.
(iv)Magnets can deflect them.

(9c)
It receives electrical energy and converts it into two other forms: x-radiation and heat. The heat is an undesirable byproduct. X-ray tubes are designed and constructed to maximize x-ray production and to dissipate heat as rapidly as possible. The x-ray tube is a relatively simple electrical device typically containing two principle elements: a cathode and an anode. As the electrical current flows through the tube from cathode to anode, the electrons undergo an energy loss, which results in the generation of x-radiation.

(11a)
The capacitance of a Capacitor is defined as being that a capacitor has the capacitance of One Farad when a charge of One Coulomb is stored on the plates by a voltage of one volt. Note that capacitance, C is always positive in value and has no negative units.

(11aii)
One of the reason is to keep the conducting plate from coming contact

(11aiii)
(i)used in ratio circuit for tuning
(ii)used in the ignition system of motor vehicle

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