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4,719 questions

Question 1 of 20 4,719 total questions

Question 91

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 92

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 93

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 94

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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Question 95

waec 2024

A particle of mass 3.6 x 10\(^{-6}\)kg revolving around the earth has a radial acceleration of 4.3 x 10\(^7\)ms\(^{-2}\). Calculate the centripetal force of the particle.

A1.55 x 10\(^2\)N

B2.00 x 10\(^{-2}\)N

C6.25 x 10\(^{-14}\)N

D1.00 x 10\(^2\)N

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Question 96

waec 2024

In the circuit diagram above, which lamp causes the other to go off?

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Question 97

waec 2024

Two isolated charged spheres each of magnitude + 1.0 x 10\(^{-6}\) C are seperated by a distance of 2.0 x 10\(^{-1}\) m. Calculate the magnitude of the electrostatic force between them [K = \(\frac{1}{4\pi \epsilon_o}\) = 9 x 10\(^9\)Nm\(^2\)C\(^{-2}\)]

A2.25 x 10\(^{-1}\)N

B4.50 x 10\(^{-1}\)N

C2.25 x 10\(^1\)N

D4.50 x 10\(^1\)N

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Question 98

waec 2024

All of the following uses are practical applications of x-ray except

Athe treatment of tumors

Bdetermining the depth of a mine

Cdental operation

Ddetecting fractures in bones

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Question 99

waec 2024

A temperature of 60º C is equivalent to

A25ºF

B140ºF

C50ºF

D108ºF

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Question 100

waec 2024

A cube of water with side 10.0 cm floats vertically in water with 4.5 cm its length submerged. Calculate the density of the wood.
[Density of water = 1 g/cm\(^3\); D = 0.090 g/cm\(^3\)]

A0.090 g/cm\(^3\)

B0.450 g/cm\(^3\)

C0.230 g/cm\(^3\)

D0.0450 g/cm\(^3\)

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Question 101

waec 2024

Chromatic aberration in lenses can be corrected by using a combination of

Adiverging and converging lenses.

Ban opaque material to cover the rims of lenses.

Cwide parallel beams on the lenses' surface.

Da thin convex lens.

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Question 102

waec 2024

An object is placed 1.5 m from a plane mirror. How far is the image from the object?

A3.0 m

B1.3 m

C1.0 m

D0.3 m

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Question 103

waec 2024

To convert a milli-ammeter to an ammeter, a resistor of low value is necessary to connect a resistor of

Alow value in series with it

Bhigh value in series with it

Clow value in parallel with it

Dhigh value in parallel with it

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Question 104

waec 2024

A stone of mass 200 g attached to a string is made to revolve in a horizontal circle of radius 1.5 m at a steady speed of 5 m/s. Calculate the tension in the string at the bottom of the circle.

A5.3 N

B3.3 N

C2.0 N

D1.3 N

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Question 105

waec 2024

The law of conservation of momentum is stated for closed and isolated system. What are the two conditions for a system to be closed and isolated?

ANo external force acts on the system and there is no change in mass of the system.

BNo external force acts on the system and there is a gain in mass.

CNo external force acts on the system and there is a loss in mass.

DAn external force acts on the system and there is no change in mass.

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Question 106

waec 2024

A body moves with uniform velocity when the resultant force on it is

Agreater than the frictional force acting on it

Bless than the frictional force acting on it

Cequal to zero

Dequal to unity

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Question 107

waec 2024

The function of a fuse in an electric circuit is to

Abreak the circuit when the current exceeds a certain value

Bsave energy by reducing voltage

Censure that the current in the circuit exceeds a certain value

Dsave energy by reducing the current

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Question 108

waec 2024

A ray of light travels from a less dense medium to a denser medium. How are the speed and frequency of the light affected? The speed

AIncreases and the frequency increases

Bdecreases and the frequency decreases

Cincreases and the frequency remains the same

Ddecreases and the frequency remains the same

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Question 109

waec 2024

The diagram above illustrates the motion of a cyclist from P to R. The distance travelled is determined by the

Aarea under QR

Barea under PQR

Cgradient of PQR

Dgradient of QR

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Question 110

waec 2024

The capacitance of a parallel plate capacitor

Adecreases when the temperature between the plates decreases

Bincreases when the potential difference between the plates is increased

Cis greater without a dielectric between the plates than with dielectric

Dis greater with dielectric between the plates than without dielectric.

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