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4,719 questions

Question 1 of 20 4,719 total questions

Question 451

waec 2018

The circuit contains three ammeters A1, A2 and A3 with readings of A2 and A3 shown as indicated in the diagram. Determine the reading of A1.

A2A

B3A

C5A

D8A

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Question 452

waec 2018

Which of the following statements about parallel plate capacitors is/are correct?

I. Capacitance of the capacitor is inversely proportional to the distance between the plates

II. Capacitors can filter a.c signals from d.c

III. Capacitors can store charges

AI only

BI and II only

CII and III only

DI, II and III

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Question 453

waec 2018

The diagram above illustrates the wire connections to a three-pin plug. The wires P, Q and R respectively are:

Alive, neutral and earth

Bneutral, earth and live

Cearth, live and neutral

Dearth, neutral and live

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Question 454

waec 2018

Which of the following statements is not an advantage of an alkaline accumulator?

AThe electrolyte does not need attention

BIt can be recharged

CIt has low internal resistance

DIt has a much longer life than lead-acid accumulator

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Question 455

waec 2018

A resistor with fixed resistance value is called a

Aresistance box

Bstandard resistor

Cshunt resistor

Dmultiplier resistor

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Question 456

waec 2018

The diagram above illustrates a waveform. Determine the number of wavelengths in it

B3\(\frac{1}{2}\)

C2\(\frac{1}{2}\)

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Question 457

waec 2018

A wire of length 400cm is stretched between two fixed points. When plucked, its fundamental frequency is 150Hz. Calculate the speed of the wave produced.

A250\(ms^{-1}\)

B625\(ms^{-1}\)

C1200\(ms^{-1}\)

D1500\(ms^{-1}\)

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Question 458

waec 2018

When the speed of a car is halved, its kinetic energy is

Adoubled

Bquartered

Chalved

Dquadrupled

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Question 459

waec 2018

In the diagram illustrated a block of mass M is at rest on a plane inclined at an angle \(\theta\) to the horizontal. As \(\theta\) increases, the velocity ratio of the plane

Aincreases

Bdecreases

Cremain the same

Ddecreases and later increases

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Question 460

waec 2018

The primary of a transformer has 100 turns and its secondary has 200 turns. If the voltage at the primary is 100V, determine the voltage at the secondary.

A50V

B100V

C200V

D400V

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Question 461

waec 2018

Two objects P and Q of masses 100kg and 20kg respectively are 1.2m apart on a horizontal surface. Calculate the net gravitational force acting on Q. \([G= 6.67 \times 10^{-11} Nm^{2}kg^{-2}]\)

A\(1.11\times 10^{-7} N\) towards P

B\(1.11\times 10^{-7} N\) towards Q

C\(9.26\times 10^{-8} N\) towards P

D\(9.26\times 10^{-8} N\) towards Q

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Question 462

waec 2018

The diagram above represents a transverse travelling wave. Which two points are 180° out of phase?

AA and E

BB and D

CC and F

DD and H

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Question 463

waec 2018

To obtain a virtual, erect and magnified image from a thin converging lens, an object must be placed

Abetween the focus and the lens

Bat the focus

Cbetween the focal length and twice the focal length

Dbeyond twice the focal length

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Question 464

waec 2018

A bar AB is balanced horizontally on two knife edges as illustrated as in the diagram above. Determine the weight of the bar.

A10.0N

B20.0N

C40.0N

D50.0N

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Question 465

waec 2018

A simple barometer is constructed using a liquid \(Q_{1}\) of density 16.2\(g/cm^{3}\). Calculate the least lenth of the tube to be used to measure pressure of 1.5atm. [Density of mercury = 13.6\(g/cm^{3}\), 1atm = 76.0 cm of Mercury]

A1358mm

B957mm

C760mm

D638mm

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Question 466

waec 2018

Which electrical device is illustrated above?

Aa.c. generator

Ba.c. motor

Cd.c. generator

Dd.c. motor

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Question 467

waec 2018

When two flat plate conductors are arranged in such a way that they possess equal and opposite charges seperated by a dielectric, they form a/an

Aelectroscope

Belectrophorus

Ccapacitor

Dcell

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Question 468

waec 2018

The pitch of a note is not affected by

Afrequency

Btension in a vibrating string

Cmass of a vibrating string

Damplitude of sound wave

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Question 469

waec 2018

Two plane mirrors are inclined to each other such that an object placed between them has 11 images. Determine the angle of inclination

A30°

B45°

C60°

D90°

View Explanation & Discuss

Question 470

waec 2018

The lens illustrated above can best be described as a

Aconverging meniscus

Bplano-convex

Cdiverging meniscus

Dbi-convex

View Explanation & Discuss

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