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1,904 questions

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Question 71

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 72

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 73

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 74

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 75

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 76

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 77

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 78

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 79

waec 2023

A1.00m

B0.75m

C0.25m

D0.50m

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Question 80

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 81

waec 2022

In which of the following situations is friction not useful?

AOperation of a grinding machine

BWalking

CApplication of brakes

DMoving piston in a sleeve

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Question 82

waec 2022

The basic principle of operation of a beam balance is------------------

AHooke's law

BArchimedes principle

Claw of flotation

Dprinciple of moments

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Question 83

waec 2022

Using venier calipers, which of the following readings gives the correct measurement for the length of a rod?

A4.1 cm

B4.13cm

C125 cm

D1254 cm

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Question 84

waec 2022

The viscosity of a fluid depends on the following factors except the?

Arelative motion between the layers of the fluid

Bnature of the material of the fluid

Csurface area of the fluid in contact

Dnormal reaction in the fluid

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Question 85

waec 2022

Molecules move in random motion within a liquid. The total internal energy of the liquid depends on all of the following except its?

Atemperature

Bmass

Cspecific heat capacity

Dmelting point

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Question 86

waec 2022

A small object of mass 50 g is released from a point A. Determine the velocity of the object when it reaches a point B, a vertical distance of 30m below A. [g = 10 ms\(^{-2}\)

A1.5 ms\(^{-1}\)

B6.0 m s\(^{-1}\)

C17.3 m s\(^{-1}\)

D24.5 m s\(^{-1}\)

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Question 87

waec 2022

A quantity of water at 0 °C is heated to 30 °C. For each degree rise in temperature, its density will---------

Arise steadily

Bfall steadily

Cfall and then rises

Drise and then falls

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Question 88

waec 2022

The engine of a car provides a forward force of 1240 N and the total resistive force on the car is 800N. If the mass of the car is 1220 kg, determine the distance the car has to travel from the rest before acquiring a speed of 4 m s\(^{-1}\).

A44.0 m

B22.2 m

C11.1 m

D5.5 m

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Question 89

waec 2022

Which of the folowing statements about light travelling from one material medium to another is not correct?

AIts wavelength does not change

BIt bends away from the normal if the speed is lower in the first material

DIts frequency changes.

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Question 90

waec 2022

Which of the following concepts is a method of heat transfer that does not require a material medium?

AConduction

BDiffusion

CConvection

DRadiation

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