Author Topic: CORRECT: 2024 WAEC PHYSICS ANSWERS (OBJ & ESSAY) (Read 8549 times)

MANDINHO · « **on:** May 19, 2024, 06:58:03 am »

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MANDINHO · « **Reply #1 on:** May 21, 2024, 03:41:25 pm »

PHYSICS THEORY ANSWERS

PHYSICS OBJ
01-10: BBBADBDACA
11-20: ACAAADBAAB
21-30: BCACADACBD
31-40: CDCCDDDADA
41-50: BCABADABDD

COMPLETED

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PART I: ANSWER FIVE(5) QUESTIONS ONLY

(1a)
The dimension of surface tension (γ) can be derived as follows:

γ = Force (F) per unit length (L) along a surface

F = [Mass (m) x Acceleration (a)]

Using the fundamental dimensions of mass (M), length (L), and time (T), we can express the dimension of force as:

F = [M L T^-2]

Now, substituting this into the expression for surface tension, we get:

γ = [M L T^-2] / L

Simplifying, we get:

γ = M T⁻²

(1b)
Gravimeter

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(2a)
(i) Polar satellites are used to study the Earth's polar regions, including weather patterns, climate change, and natural resources.
(ii) Polar satellites are used for navigation purposes, such as providing location information and timing signals for GPS (Global Positioning System) receivers.

(2b)
The slope of a graph of tensile stress against tensile strain represents the modulus of elasticity (also known as Young's modulus) of the material being tested.

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(3a)
Stress: Pascal (Pa) or Newton per square meter (N/m²)

(3b)
Force constant (also known as spring constant): Newton per meter (N/m)

(3c)
Planck's constant: Joule-second (J.s) or Newton-meter-second (N·m·s)

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(4)

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(5)
(i) Ferromagnetic materials are used in magnetic storage devices such as hard disks, magnetic tapes, and magnetic stripes on credit cards to store data.

(ii) They are used in electric motors to convert electrical energy into mechanical energy.

(iii) They are used in magnetic separation processes to separate ferromagnetic materials from non-ferromagnetic materials.

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(6)

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(7)

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PART II: ANSWER THREE (3) QUESTIONS ONLY

(8.)

(8c continuation)

(8e)

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(9)

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(10a)
The incident ray must be parallel to the principal axis (the axis passing through the center of the mirror and the focus).

(10b)
Spherical aberration is a defect of curved mirrors where rays incident at different distances from the principal axis do not converge at a single point (the focus), resulting in a blurred image.

(10c)
REDRAW THE DIAGRAM

-The principal axis is the horizontal line passing through the lens or mirror.
-The principal focus,
F, is marked on the principal axis.
-The center of curvature,
C, is also marked on the principal axis, and it is typically twice the distance from the mirror to the principal focus.

(10d)
Accommodation in connection to the human eye refers to the ability of the eye to change its focal length to focus on objects at different distances, achieved by changing the shape of the lens.

(10ei)
Near Point: The nearest point at which the eye can focus on an object comfortably is typically around 25 cm for a normal human eye.
Far Point: The farthest point at which the eye can focus on an object is effectively at infinity (∞) for a normal human eye

(10eii)
Optical power
P of a lens is given by the formula: P=1/f where
f is the focal length in meters.

When Reading a Book (Near Point):
The near point is 25 cm, or 0.25 meters.
P(near) = 1/0.25 = 4 diopters

When Viewing the Sky (Far Point):
The far point is at infinity.
P(far)= 1/∞ = 0 diopters

Change in Optical Power:
The change in optical power
ΔP is the difference between the optical power at the near point and the far point.
ΔP= P(near) - P(far)
ΔP= 4 -0
ΔP= 4 diopters
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(12)

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Author Topic: CORRECT: 2024 WAEC PHYSICS ANSWERS (OBJ & ESSAY) (Read 8549 times)

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