Get waec gce 2023/24 physics questions and answers expo

Which of the following quantities is not an example of force?

A. Mass
B. Tension
C. Weight
D. Friction
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Olive.ng exam
Correct Answer: Option A
Explanation
Mass is a measure of how much matter is in an object.

The reason for laminating the soft iron core of a transformer is to?

A. reduce eddy current.
B. reduce magnetic flux.
C. increase the magnetic flux.
D. reduce its efficiency.
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Correct Answer: Option A
Explanation
Laminated iron core means insulating layers glued compact. Now the cores are laminated to reduce Eddy current.

Formation of hydrogen bubbles at the copper plate of a primary cell is called?

A. polarization.
B. back e.m.f.
C. electrolysis.
D. local action.
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Correct Answer: Option A
Explanation
Polarization:The hydrogen bubbles which are clinging over the surface of copper electrode anode becomes a thin film of hydrogen over the copper electrode.

This hydrogen film increases the internal resistance and reduces the emf of the cell and hence the cell soon becomes inactive. This effect is known as polarization

Which of the following factors does not affect the rate of evaporation of a liquid?

A. temperature
B. volume
C. wind
D. surface area
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Correct Answer: Option B
Explanation
The rate of evaporation depends on temperature, presence of wind, the humidity of the surrounding, and the surface area of the liquid exposed to the atmosphere. It doesn’t depend on the mass of the liquid. The larger the surface area, the more would be the rate of evaporation.

Opening in the eye through which light passes to the retina is called the?

A. pupil
B. cornea.
C. iris
D. optic nerve.
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Correct Answer: Option A
Explanation
The function of the pupil is clearly that of controlling the amount of light entering the eye, and hence the light reflex.

A heat sensitive resistor made of a semiconductor is called?

A. thermometer.
B. thermostat.
C. thermistor
D. thermopile.
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Correct Answer: Option C
Explanation
Thermistors act as a passive component in a circuit. They are an accurate, cheap, and robust way to measure temperature.

Electric motor primarily converts?

A. electrical energy to chemical energy.
B. kinetic energy to potential energy
C. electrical energy to mechanical energy
D. electrical energy to heat energy.
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Olive.ng exam
Correct Answer: Option C
Explanation
An electric motor is an electrical machine that converts electrical energy into mechanical energy.

Which of the following statements about the molecules of solids and liquids is correct? They both

A. have weak attraction.
B. have wide separations.
C. exhibit random motion.
D. exhibit vibratory motion.
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Olive.ng exam
Correct Answer: Option D

The distance between a node and its adjacent antinode of a transverse wave is equal to?

A. half of the wavelength.
B. the wavelength.
C. thrice the wavelength.
D. quarter of the wavelength.
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Correct Answer: Option D

Which of the following actions will increase capacitance of a parallel plate capacitor?

I. Decreasing the distance between the plates

II. Increasing the distance between the plates.

III. Increasing the area of the plates overlap.

IV. Avoiding the use of dielectric between the plate

 

A. I and III only
B. II and III only
C. I and IV
D. . III and IV only
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Correct Answer: Option A

A metallic sphere is heated from 27°C to 200°C Without change of state. Which of the following changes would have resulted from the heating?

 

 

A. No changes occur in its volume and density
B. Its volume increases and its density increases
C. Its volume increases and its density decrease
D. Its volume increases without a change in density
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Olive.ng exam
Correct Answer: Option C

The acceleration of a moving object can be determined from the?

A. slope of its distance-time graph.
B. area under its distance-time graph.
C. slope of its velocity-time graph.
D. area under its velocity-time graph
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Correct Answer: Option C

A student wishes to measure the potential difference across a resistor,R. She has a galvanometer,G and some connecting wires.

What else does she need?

A. high value resistor connected in parallel with G
B. . low value resistor connected in parallel with G low value
C. resistor connected in series with G
D. high value resistor connected in series with G.
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Correct Answer: Option D

The handle of a screw jack is 35 cm long and pitch of the screw is 0.5 cm. What force must be applied at the end of the handle to lift a load of 2000N, if the efficiency of the jack is 30% [π = 22/7]?

A. 152.0N
B. 132.0N
C. 15.2N
D. 440.0N
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Correct Answer: Option C

The inductive reactance in a circuit of frequency 100Hz is 1ohms. Calculate the inductance of the inductor[π = 3.14]

 

A. 2.00 x 10−3
H
B. 1.59 x 10−3
H
C. 1.09 x 10−3
H
D. 6.28x 10−3
H
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Olive.ng exam
Correct Answer: Option B

The diagram illustrates the velocity- time graph of a body. Calculate the distance covered by the body during the motion

Open photo

A. 15m
B. 84m
C. 72m
D. 48m
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Olive.ng exam
Correct Answer: Option D
Explanation
Velocity = ΔsΔt
Δv = 10 – 4 → 6m/s

Δt = 12 – 4 → 8s

Δs = Δv X Δt → 6 X 8

Δs = 48m

An atom that emits an a-particle?

 

A. may become a different element.
B. becomes a different isotope of the element.
C. daughter with increased mass.
D. becomes a daughter of a different element always.
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Correct Answer: Option A
Explanation
Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and

thereby transforms or ‘decays’ into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two.

Which of the following units is equivalent to the unit of electric current?

A. C s−1

B. W
C. J s−1

D. C
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Correct Answer: Option A
Explanation
Q = It

I = Q/t

I = C / s

= Cs−1

A ball is swung in a horizontal circle of centre O with a constant speed. acceleration?

A. Away from O
B. Along the Circumference of the circle
C. Toward centre O
D. Along a tangent to the circle
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Correct Answer: Option C
Explanation
Simple harmonic motion (SHM) is a special type of periodic motion where the restoring force on the moving object is directly proportional to the magnitude of the object’s displacement and acts towards the object’s equilibrium position.

Which of the following statements is an effect of compressing gas molecules at constant temperature?

A. The pressure on the molecules decreases.
B. The molecules gain more kinetic energy.
C. The molecules make more impact per second on the walls of the container.
D. The molecules increase in size.
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Correct Answer: Option C

Explanation

More collisions mean more force, so the pressure will increase.

When the volume decreases, the pressure increases.

This shows that the pressure of a gas is inversely proportional to its volume.

This is shown by Boyle’s law.

 

The diagram above is an illustration of an a.c. circuit.Calculate the reactance of the capacitor.

 

 

 

A. 2016Ω
B. 2000Ω
C. 200Ω
D. 4000Ω
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Correct Answer: Option C

Explanation

Capacitive reactance, XC

= (\frac{1}{2πFC}) → (\frac{1}{2π * 500/π * 5 * 10^{-6}})

= 10.005
→ 200Ω

A current of 2A passes through a wire of resistance 4Ω for 3 minutes. Calculate the energy lost.

A. 960J
B. 1440J
C. 2880J
D. 48J
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Correct Answer: Option C

Explanation

Power = current[I]2
* Resistance[R] → 22
* 4 → 4 * 4 = 16watts

time = 3minutes → 3 * 60 = 180s

Energy = power * time → 16 * 180 = 2880j

Which of the following statements about the universal gravitational constant, G, is true?

A. It is fundamental quantity.
B. It has dimension M-¹L³T-².
C. Its S.I. unit is N m2
kg
D. It is a vector quantity
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Correct Answer: Option B
Explanation
The universal Gravitational constant(G) is a scalar quantity as it is not in a particular direction.

dimensional formula =M-¹L³T-²

S.I. unit = Nm2
/kg2

The sketched graph represents a progressive wave moving from the left to the right. The period the wave is 0.125s.

Determine the values of the amplitude and wavelength, respectively, of the wave.

 

Open photo

 

 

A. 8 cm; 27 cm
B. 8 cm; 9 cm
C. 4 cm; 9 cm
D. 16 cm; 27 cm
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Correct Answer: Option B

CONCLUSION: Here is the 2022/23 waec gce first series physics questions and answers expo