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126 questions

Question 1 of 20 126 total questions

Question 21

waec 2023

A planet has mass, M, and radius R, If the universal gravitational constant is G, what is the expression for the escape velocity of an object on the planet?

A\(\frac{\sqrt{GR}}{2}\)

B\(\frac{\sqrt{2GM}}{R}\)

C\(\frac{\sqrt{2G}}{R}\)

D\(\frac{\sqrt{GM}}{R}\)

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Question 22

waec 2023

Increasing the frequency of a sound wave produces a sound with

Ahigher pitch

Blonger wavelength

Cmore overtones

Dreduced loudness

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Question 23

waec 2023

In a mass spectrometer, an ion of charge, q, and mass, m, moving in a path of radius, r, in a field of flux density, B, has a speed of

A\(\frac{qBr}{m}\)

B\(\frac{mr}{qB}\)

C\(\frac{qm}{Br}\)

D\(\frac{mq}{r}\)

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Question 24

waec 2023

A body starts with an initial velocity of 20 m/s and moves with a uniform acceleration, a, for 15 seconds. Which of the following equations represents the distance, S, traveled?

A300 + 56\(\frac{a}{2}\)

B300 + \(\frac{225a}{2}\)

C300 + \(\frac{225}{2a}\)

D300a + \(\frac{225}{2}\)

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Question 25

waec 2023

In a controlled thermal fission reactor, the use of control rods will not affect the

Aenergy generated in the nuclear reactor

Brate of production of the neutrons.

Cspeed of the neutrons released on fission.

Damount of radiation produced in the nuclear reactor.

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Question 26

waec 2023

The process of producing electric current by a changing magnetic field is referred to as

Amagnet induction

Belectromagnetic induction

Cflux linkage

Delectrostatic induction.

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Question 27

waec 2023

Which of the following diagrams correctly illustrates the mode of oscillation of air in a tube for the first overtone?

( The diagrams above are meant to help you in answering this question)

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Question 28

waec 2023

The diagram above illustrates a mode of vibration of a wire of length 125 cm. The speed of the waves along the wire is 120 ms-1. Use the diagram to answer questions 2 and 3.
Determine the frequency of the waves

A240Hz

B24Hz

C192Hz

D286Hz

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Question 29

waec 2023

A1.00m

B0.75m

C0.25m

D0.50m

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Question 30

waec 2023

Which of the following statements about the properties of the electric field produced by charged parallel plates is not correct?

AThe electric field in the region outside the parallel plate is zero, except for the edge effects

BThe magnitude of the electric field strength at any point between the plates, except near the edges, depends on the magnitude of the charge on each plate.

CThe magnitude of the electric field strength at any point between the plates is directly proportional to the magnitude of the charge on each plate.

DThe electric field is uniform everywhere in the space between the parallel plates

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Question 31

jamb 2023

A metal sphere is placed on an insulating stand. A negatively charged rod is brought close to it. If the sphere is earthed and the rod is taken away, what will be the charge on the sphere?

AThe sphere will remain neutral.

BThe sphere will have a net negative charge.

CThe sphere will have a net positive charge.

DThe sphere will become polarized

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Question 32

jamb 2023

The pitch of a musical note is determined by the frequency of the sound wave that it produces. If two instruments have the same frequency, which of the following factors will most affect the difference in their pitches?

AThe shape of the instrument

BThe tension of the string

CThe size of the instrument

DThe material of the instrument

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Question 33

jamb 2023

In an AC circuit, resonance occurs when the impedance of the circuit is:

AZero

BMaximum

CEqual to the capacitive reactance of the circuit

DMinimum

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Question 34

jamb 2023

Which of the following is a type of wave that is both mechanical and longitudinal?

AWater waves

BSeismic waves

CSound waves

DLight waves

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Question 35

jamb 2023

Which of the following types of electromagnetic waves is used in night vision goggles?

AMicrowaves

BUltraviolet waves

CInfrared waves

DRadio waves

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Question 36

jamb 2023

In the diagram above, if the south poles of two magnets stroke a steel bar, the polarities at X and Y will respectively be

Asouth and north

Bnorth and south

Cnorth and north

Dsouth and south

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Question 37

jamb 2023

Which of the following statements is correct about the angle of dip at various points on Earth?

AThe angle of dip is zero at the equator and 90 degrees at the magnetic poles.

BThe angle of dip is greater at higher altitudes than at lower altitudes

CThe angle of dip is positive in the northern hemisphere and negative in the southern hemisphere.

DThe angle of dip is constant at all points on Earth

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Question 38

jamb 2023

When a water droplet is placed on a freshly cut piece of wood, it spreads out to form a thin layer because the wood is

Anot at equilibrium with the water

Bcohesive to water

Cat equilibrium with the water

Dadhesive to water

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Question 39

jamb 2023

A positively charged particle is placed near a negatively charged particle. What is the direction of the electric force between the two particles?

AThe electric force is directed from the negative particle to the positive particle.

BThe electric force is zero.

CThe direction of the electric force cannot be determined.

DThe electric force is directed from the positive particle to the negative particle.

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Question 40

jamb 2023

Which of the following is an example of a couple?

AAll of the above.

BThe forces that are applied to the handle of a screwdriver when you twist it.

CThe forces that are applied to a cross wench to loosen or tighten the lug nuts on a wheel of a car.

DThe forces that are applied to the steering wheel of a car when you turn it.

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