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1,904 questions

Question 1 of 20 1,904 total questions

Question 31

waec 2024

Four pieces of constantan wire, marked E, F, G, and H, each of length 1.0m, are at the temperature. Their respective diameters are 1 mm, 2 mm, 6 mm, and 10 mm. Which wire has the highest resistance?

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Question 32

waec 2024

The correct sequence of ionization power of alpha particle, gamma ray, and beta particle respectively is

Alow, medium, high.

Bhigh, medium, low.

Cmedium, low, high.

Dhigh, low, medium.

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Question 33

waec 2024

Which of the following modes is the most economical method of transmitting electrical power over a long distance?

AAlternating current at high voltage and low current.

BAlternating current at low voltage and high current.

CDirect current at high voltage and low current.

DDirect current at low voltage and high current.

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Question 34

waec 2024

The phenomenon used for explaining the formation of a rainbow in the sky is

Ainterference.

Brefraction.

Creflection.

Ddispersion.

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Question 35

waec 2024

The main difference between X-rays and gamma rays is in their

Aionizing ability.

Babsorbing rate.

Cmode of propagation.

Dmode of production.

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Question 36

waec 2024

Atmospheric pressure decreases with an increase in altitude because:

AAcceleration due to gravity increases with altitude.

BTemperature increases with altitude.

CInternal energy increases with altitude.

DInteraction among air molecules decreases due to less quantity of air.

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Question 37

waec 2024

Which of the following statements about a projectile is not correct?

AProjectile motion is a two-dimensional motion.

BA projectile is an object launched into the air and allowed to move freely due to gravity.

CThe range of a projectile is independent of the acceleration due to gravity.

DThe time of flight dependent of the acceleration due to gravity

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Question 38

waec 2024

The inside portion of a hollow metal sphere of diameter 20 cm is polished. The portion will therefore form a

AConcave mirror of focal length 5cm.

BConcave mirror of focal length 10 cm.

CConvex mirror of focal length 10 cm

DConvex mirror of focal length 5cm

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Question 39

waec 2024

In which of the following devices is the thermal expansion considered a disadvantage?

AFire alarm

BThermostat

CBimetallic thermometer

DBalance wheel of a watch

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Question 40

waec 2024

A capacitor described as a mica capacitor has

Aboth plates are made of mica.

Ba mica dielectric.

Ca dielectric made of mica

Dthe same capacitance as that of mica

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Question 41

waec 2024

Which of the following terms has different dimension from the others?

AStress x Strain

BPressure

C\(\frac{\text{stress}}{\text{strain}}\)

DTorque

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Question 42

waec 2024

The depolarizing agent in a Leclanché cell is

Apowdered carbon.

Bmanganese (IV) oxide.

Ccarbon rod.

Dammonium.

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Question 43

waec 2024

A boy of mass 40 kg jumps off a stationary skateboard and moves horizontally with a speed of 1.5 m/s while the skateboard moves in the opposite direction with a speed of 20 m/s. Calculate the mass of the skateboard.

A60 kg

B40 kg

C3 kg

D2 kg

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Question 44

waec 2024

The diagram above illustrates two boxes P and Q of masses 27.3 kg and 6.2 kg respectively on a smooth horizontal surface. If a force F of 150 N is applied to the combined forces, calculate the acceleration.

A4.5 ms\(^{-2}\)

B33.5 ms\(^{-2}\)

C70 ms\(^{-2}\)

D150 ms\(^{-2}\)

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Question 45

waec 2024

An object 2.0 cm high is placed at the radius of curvature of a concave mirror such that it is perpendicular to the principal axis of the mirror. Determine the height of the image.

A0.5 cm

B1.0 cm

C1.5 cm

D2.0 cm

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Question 46

waec 2024

Light of energy 1.12 x 10\(^{-18}\) J is incident on a metal of ejected electrons with maximum energy of 8.0 x 10\(^{-19}\)J. Calculate the threshold frequency of the metal. [h = 6.626 x 10\(^{-34}\)Js]

A4.8 x 10\(^{14}\)Hz

B1.2 x 10\(^{15}\)Hz

C1.7 x 10\(^{15}\)Hz

D2.8 x 10\(^{15}\)Hz

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Question 47

waec 2024

A body of mass, m is projected vertically upward with a velocity, y. At what position will the potential energy be maximum?

A\(\frac{y}{g}\)

B\(\frac{2y^2}{g}\)

C\(\frac{y^2}{2g}\)

D\(\frac{y^2}{4g}\)

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Question 48

waec 2024

A 2 μF capacitor is connected directly across a 150 V\(_{rms}\), 60 Hz A.C source. Calculate the r m s value of the current.

A0.113 A

B0.160 A

C150 A

D1324 A

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Question 49

waec 2024

A constant voltage source supplies a sinusoidal alternating e.m.f. The voltage marked against the components are their peak values. Determine the peak value of the applied e.m.f

A1V

B4V

C5V

D2V

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Question 50

waec 2024

For a convex lens to form a real image, the distance between the object and the screen will be:

Aequal to the focal length of the lens

Bless than the focal length of the lens

Ctwice the focal length of the lens

Dfour times the focal length of the lens

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