CLICK TO JOIN WHATSAPP GROUP # Physics Neco Answers 2022

(6a)
Transverse wave particles of waves move perpendicular in the direction of the wave while in longitudinal waves particles move horizontally in the direction of the wave.

(6b)
(i) Water waves
(ii) Sound waves
(7)
(i) The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.

(ii)
– Kaleidoscope
– Periscope
(7i)
{PICK ANY ONE}
(i) The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.
(ii) The incident ray, the normal and the reflected ray are all in the same plane.
(iii) The incident ray and the reflected ray are on different sides of the normal

(7ii)
{PICK ANY TWO}
(i) Colorimeter
(ii) spectrophotometer
(iii) Periscope
(iv) kaleidoscope
(3)
(i) The principle of floatation states that when a body floats with its volume partially above the liquid surface, the quantity of the liquid displaced by the body is equal to the quantity of the submerged portion of the body. As the body is in equilibrium, the buoyant force acting on the body must be equal to its weight.

(ii)
– Gravity (pulls object downward)
– Buoyant force (pushes object upward). The buoyant force is equal to the weight of the volume of water displaced by the object.
(6a)
Transverse wave particles of waves move perpendicular in the direction of the wave while in longitudinal waves particles move horizontally in the direction of the wave.

(6b)
(i) Water waves
(ii) Sound waves

(7)
(i) The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.

(ii)
– Kaleidoscope
– Periscope

(7i)
{PICK ANY ONE}
(i) The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.
(ii) The incident ray, the normal and the reflected ray are all in the same plane.
(iii) The incident ray and the reflected ray are on different sides of the normal

(7ii)
{PICK ANY TWO}
(i) Colorimeter
(ii) spectrophotometer
(iii) Periscope
(iv) kaleidoscope
(12a)
(i) It makes walking and running possible.
(ii) It enables the gripping of belts in machines possible.
(iii) It enables nails to stay in the wall when driven.

(12b)
(i) It always resists the motion, so extra energy is required to overcome it.
(ii) It causes wear and tears on machines.
(iii) It decreases the life expectancy of moving parts of vehicles.

See also  Monday 18th July 2022 Neco Papers

Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.

(12ai)

(i) It makes walking and running possible.

(ii) It enables gripping of belt in machines possible.

(iii) It enables nails to stay in the wall when driven.

(12aii)

(i) It always resists the motion, so extra energy is required to overcome it.

(ii) It causes wear and tear of machines.

(iii) It decreases the life expectancy of moving parts of vehicles.

(12bi)

The bob does not oscillate forever. It comes to rest because air resistance resists its motion. The pendulum loses its kinetic energy to overcome this friction and stops after some time.

(12bii)

The period of oscillation of a simple pendulum is known to be affected by the length of the pendulum and the acceleration due to gravity. The period is known to be completely independent of other factors like the mass of the pendulum.

(2)

*TABULATE*

Scalar Quantities

(i). They have magnitude but no direction.

(ii). Scalars are added by ordinary algebraic methods.

Vector Quantities

(i). They have both magnitude and Direction.

(ii). Vectors are added by Geometrical methods.

NECO PHYSICS ESSAY SOLUTIONS

Instruction: Answer question 1 and any other 5 questions making it 6 questions in total.

(2a)

Scalar Quantity Vector Quantity

These are physical quantities which are expressed only by their magnitude. These physical quantities require magnitude as well as the direction to express them, then only their meaning is complete.

We need two parameters to express a scalar quantity. We require three parameters to express a vector quantity.

The parameters are:

(i) unit in which the quantity is being measured

(ii) numerical value of the measured quantity. The parameters are:

(i) unit

(ii) direction

(iii) numerical value of quantity.

Scalar quantities can be added, subtracted, multiplied and divided by simple arithmetic methods. Vector quantities follow different algebra for their addition, subtraction, multiplication and division.

(2b) opposite direction

Resultant = 3N – 4N= -1N

(3)

(i) The principle of floatation states that when a body floats with its volume partially above the liquid surface, the quantity of the liquid displaced by the body is equal to the quantity of the submerged portion of the body. As the body is in equilibrium, the buoyant force acting on the body must be equal to its weight.

(ii)

– Gravity (pulls object downward)

– Buoyant force (pushes object upward). The buoyant force is equal to the weight of the volume of water displaced by the object.

(4a) E= mgh = 40 X 10 X 0.3 X 6= 720J

(4b) P= mgh/t

m= PT/GH= 60 X 12 / 10 X 0.3 X 6 = 40g

(6a) Transverse waves particles of waves move perpendicular in the direction of the wave while in longitudinal waves particles move horizontally in the direction of the wave.

(6b)

(i) Water waves

(ii) Sound waves

(7i)

{PICK ANY ONE}

(i) The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.

(ii) The incident ray, the normal and the reflected ray are all in the same plane.

(iii) The incident ray and the reflected ray are on different sides of the normal

(7ii)

{PICK ANY TWO}

(i) Colorimeter

(ii) spectrophotometer

(iii) Periscope

(iv) kaleidoscope

(8a) The resistivity of a material  is defined in terms of the magnitude of the electric field across it that gives a certain current density.

(8b) R=Pl/A

0.5= 0.000003 X 4 / A

0.5A = 0.000012

A= 0.000012/0.5= 0.000024m²

(12ai)

{PICK ANY TWO}

(i) It makes walking and running possible.

(ii) It enables gripping of belt in machines possible.

(iii) It enables nails to stay in the wall when driven.

(12aii)

{PICK ANY TWO}

(i) It always resists the motion, so extra energy is required to overcome it.

(ii) It causes wear and tear of machines.

(iii) It decreases the life expectancy of moving parts of vehicles.

(12bi)

The bob does not oscillate forever. It comes to rest because air resistance resists its motion. The pendulum loses its kinetic energy to overcome this friction and stops after some time.

(12bii)

The period of oscillation of a simple pendulum is known to be affected by the length of the pendulum and the acceleration due to gravity. The period is known to be completely independent of other factors like the mass of the pendulum.

(8a)

Resistivity of a wire is the resistance per unit length and cross-sectional area. It is the property of the material that opposes the flow of charge or the flow of electric current. The unit of resistivity is ohm meter. We know that R = ρ L / A.

(8b).

R = ρ L / A.

ρ = R A /L

A = ρ L / R

A= 3.0 x 10^-6 x 4 / 0.5

A = 1.2 x 10^-5 / 0.5

A = 2.4 x 10^-5 m²

(5a).

[Pick One]

(i). Positive charge: This type of charge can be produced by rubbing a glass rod with silk.

Or

(ii). Negative charge: It can be obtained on an ebonite rod by rubbing it with fur.

(5a).

[Pick One]

(i). Positive charge: This type of charge can be produced by rubbing a glass rod with silk.

Or

(ii). Negative charge: It can be obtained on an ebonite rod by rubbing it with fur.

(5b).

V1= 500cm³

T1 = 23° + 273= 296k

P1 = 600mmHg

V2 = ?

T2= 37° + 273 = 310K

P2 = 720mmHg

V1P1 / T1 = V2P2 / T2

500 x 600 / 296 = V2 x 720 / 310

V2 = 500 x 600 x 310 / 720 x 296

V2 = 436.37 cm³    OBJ:

Coming soon

(1)

{VIEW IMAGE BELOW}

[img]https://i.imgur.com/4Escfn0.jpg[/img]

(2)

-TABULATE-

SCALAR QUANTITIES

(i) They have magnitude but no direction.

(ii) Scalars are added by ordinary algebraic methods.

VECTOR QUANTITIES

(i) They have both magnitude and Direction.

(ii) Vectors are added by Geometrical methods.

(2b)

R²=3²+4²

=9+16

=25

R=✓25

R=5N

(3i)

The floatation principle states that when an object floats in a liquid, the buoyant force acting on the object is equal to the object’s weight.

(3ii)

{PICK ANY TWO}

(i) The density of the fluid.

(ii) The volume of the fluid displaced.

(iii) The local acceleration due to gravity.

(5a)

{PICK ANY DEFINITION}

(i) Positive charge: This type of charge can be produced by rubbing a glass rod with silk.

OR

(ii) Negative charge: It can be obtained on an ebonite rod by rubbing it with fur.

(5b)

V1= 500cm³

T1 = 23° + 273= 296k

P1 = 600mmHg

V2 = ?

T2= 37° + 273 = 310K

P2 = 720mmHg

V1P1 / T1 = V2P2 / T2

500 x 600 / 296 = V2 x 720 / 310

V2 = 500 x 600 x 310 / 720 x 296

V2 = 436.37 cm³

(6a)

Transverse waves particles of waves move perpendicular in the direction of the wave while in longitudinal waves particles move horizontally in the direction of the wave.

(6b)

(i) Water waves

(ii) Sound waves

(7i)

{PICK ANY ONE}

(i) The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.

(ii) The incident ray, the normal and the reflected ray are all in the same plane.

(iii) The incident ray and the reflected ray are on different sides of the normal

(7ii)

{PICK ANY TWO}

(i) Colorimeter

(ii) spectrophotometer

(iii) Periscope

(iv) kaleidoscope

(8)

{VIEW IMAGE BELOW}

[img]https://i.imgur.com/ZMdwmMu.jpg[/img]

(9)

{VIEW IMAGE BELOW}

[img]https://i.imgur.com/PJ7VFar.jpg[/img]

(10)

{VIEW IMAGE BELOW}

[img]https://i.imgur.com/D7ISf5Z.jpg[/img]

(12)

{VIEW IMAGE BELOW}

[img]https://i.imgur.com/Wa7S2Bq.jpg[/img]

[img]https://i.imgur.com/a3CIM0v.jpg[/img]

[img]https://i.imgur.com/mTOulr9.jpg[/img]

(13)

{VIEW IMAGE BELOW}

[img]https://i.imgur.com/SfnXTls.jpg[/img]

[img]https://i.imgur.com/mO5PBtl.jpg[/img]

(15)

{VIEW IMAGE BELOW}

[img]https://i.imgur.com/dr03KaI.jpg[/img]

(16)

{VIEW IMAGE BELOW}

[img]https://i.imgur.com/0Ta9AzB.jpg[/img]

Physics obj

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