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1,904 questions

Question 1 of 20 1,904 total questions

Question 91

waec 2022

The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called

Aferrite substance

Bparamagnetic substance

Cferromagnetic substance

Ddiamagnetic substance

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Question 92

waec 2022

The period of a 10 kHz radio wave traveling at 10\(^{8}\) ms\(^{-1}\) is--

A3.0 x 10\(^{-5}\)s

B1.0 x 10\(^{-4}\) s

C1.0 x 10\(^{4}\)s

D3.0 x 10\(^{4}\)s

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Question 93

waec 2022

Current is passed through two parallel conductors in the same direction. If the conductors are placed near each other, they will------------------

Amove in a circle

Brepel each other

Cremain stationary

Dattract each other

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Question 94

waec 2022

The reason for having a large number of turns in the coil of a moving coil galvanometer is to--------

Amake the deflection of the needle proportional to the current

Bincrease the sensitivity of the galvanometer

Cdecrease the magnetic flux produced by the magnet

Dmake the permanent magnet stronger

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Question 95

waec 2022

The power of the lens is +2.5D. What is the radius of the curvature?

A2.5 cm

B25.0 cm

C40.0 cm

D80.0 cm

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Question 96

waec 2022

The periodic rise and fall in the intensity of sound produced whn two notes of nearly equal frequencies are sounded together is called?

Adoppler effect

Bbeat

Cinterference

Dresonance

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Question 97

waec 2022

An object is placed at different distances, u, from a converging lens of focal length, 15.0cm. For what value of u does the lens act as a microscope?

Au = 15cm only

Bu = 30cm only

CM < 15cm only

Du > 30cm only

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Question 98

waec 2022

A freely suspended compass needle on the earth's surface settles in a plane called----------

Ageographic meridian

Bmagnetic meridian

Cmagnetic declination

Disoganals

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Question 99

waec 2022

The efficiency of a wheel and axle is 100% and the ratio of their radii is 5:1. calculate the effort required to lift a load of mass 20kg using this machine, [g = 10 m s\(^{-2}\)]

A20N

B25N

C40N

D100N

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Question 100

waec 2022

Which of the following descriptions of the image formed by a plane mirror is not correct. the image is----

Aerect and of the same size as the object

Blaterally inverted and of the same size as the object

Cerect and bigger than the object

Dvirtual and if the same size

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Question 101

waec 2022

An example of a mechanical wave is---------

Awater waves

Bradio waves

Cx-rays

Dlight rays

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Question 102

waec 2022

Which of the following statement(s) is/are correct about a fixed mass of gas compressed in an inexpansible container;

I. The average speed of the molecules increases

II. The temperature of the gas increases

III. The molecules hit the walls of the container more often than before the compression

AI only

BI and II only

CI, II, and III only

DI and III

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Question 103

waec 2022

The joule is equivalent to?

AKg m\(^{2}\) s\(^{-1}\)

BKg\(^{2}\) m s\(^{-2}\)

CKg m\(^{2}\) s\(^{-2}\)

DKg m s\(^{-1}\)

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Question 104

waec 2022

The correct relationship between the displacement, s, of a particle initially at rest in a linear motion and the time, t, is?

As \(\alpha\) t\(^{-2}\)

Bs \(\alpha\) t\(^{-1}\)

Cs \(\alpha\) t

Ds \(\alpha\) t\(^{2}\)

View Explanation & Discuss

Question 105

waec 2022

Which of the illustrated graphs above represents a body moving with uniform retardation?

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Question 106

waec 2022

Suppose three identical steel balls Q, R, and S, are placed on an undulating ground as illustrated in the diagram above. Which of the balls is/are in neutral equilibrium?

AS only

BQ only

CR only

DQ and S only

View Explanation & Discuss

Question 107

waec 2022

The linear expansivity, \(\alpha\), and cubic expansivity, \(\gamma\), of a material are related by the equation?

A\(\gamma\)=a

B\(\gamma\)=3\(\alpha\)

C\(\gamma\)=2a

D\(\gamma\)=\(\frac{1}{3} \alpha \)

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Question 108

waec 2022

The length of a simple pendulum is increased by a factor of four. By what factor is its period increase?

A0.5\(\pi\)

C2\(\pi\)

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Question 109

waec 2022

From the principle of flotation, a body sinks in a fluid until it displace a quantity equal to its own?

Adensity

Bmass

Cweight

Dvolume

View Explanation & Discuss

Question 110

waec 2022

The area under a force-time graph represents--------

Achange in kinetic energy

Bchange in momentum

Cchange in work done

Dchange in internal energy

View Explanation & Discuss

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