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50 questions

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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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