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1,904 questions

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Question 41

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 42

waec 2024

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

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Question 43

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 44

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 45

waec 2024

A temperature of 60º C is equivalent to

A25ºF

B140ºF

C50ºF

D108ºF

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Question 46

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 47

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 48

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 49

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 50

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 51

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 52

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 53

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 54

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 55

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 56

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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Question 57

waec 2024

What are cathode rays?

AStream of electrons

BBeam of neutrons

CBeam of protons

DStream of alpha particles

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Question 58

waec 2024

In which of the following states is MAXIMUM pressure exerted on a person

AStanding on two feet

BStanding on one foot

CLying on the floor

DKneeling on the floor

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Question 59

waec 2024

The magnitude of the acceleration of a moving object is equal to the

Agradient of a displacement-time graph

Bgradient of a velocity-time graph

Carea below a force-time graph

Darea below a velocity-time graph

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Question 60

waec 2024

The vacuum and silvered wall surfaces of a vacuum flask walls are respectively

Aminimize conduction and convection and prevent radiation

Bprevent conduction and convection and minimize radiation

Cprevent conduction and minimize convection and radiation

Dminimize convection and prevent conduction and radiation

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