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4,719 questions

Question 1 of 20 4,719 total questions

Question 521

waec 2017

Which of the following statements is/ are correct?

I. Gravitational potential due to a mass at a point a distance r away is proportional to \(r^{2}\)

II. Gravitational field strength is a vector quantity

III. Gravitational intensity is proportional to the weight of a unit mass.

AI, II and III

BIII only

CII only

DI only

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Question 522

waec 2017

A circuit is set up as shown in the diagram above. When the key is closed, the ammeter reading will be

A6A

B4A

C2A

D1A

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Question 523

waec 2017

Which of the following objects is not a conductor of electricity?

AThe Earth

BHuman body

CIron rod

DDry wood

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Question 524

waec 2017

The force per unit charge experienced at a point in a field is the

Agravitational field strength

Belectric potential

Celectric field intensity

Dmagnetic field strength

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Question 525

waec 2017

Two bar magnets are placed near each other. Which of the following diagrams correctly illustrates the magnetic field pattern formed by the pair?

BII

CIII

DIV

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Question 526

waec 2017

The inverse of the time required for a wave to complete one full cycle is called

Awavelength

Bperiod

Cfrequency

Damplitude

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Question 527

waec 2017

A converging lens of focal length 10cm forms an erect image three times the size of the real object. Calculate the distance between the image and the object.

A6.6cm

B11.1cm

C13.3cm

D20.0cm

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Question 528

waec 2017

Two plane mirrors are inclined at an angle 20° to each other. Determine the number of images formed when an object is placed between them.

A17

B18

C19

D20

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Question 529

waec 2017

The diagram above illustrates a wave setup between two fixed ends 4.0m apart. If the speed of the wave is 1.0\(ms^{-1}\), its wavelength and frequency respectively are

A1m; 0.25Hz

B2m; 0.25Hz

C2m; 0.50Hz

D4m; 0.50Hz

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Question 530

waec 2017

A ray of light incident at an angle \(\theta\) in a rectangular prism grazes the surface of the prism on emerging from the prism. Determine the value of the angle. [Absolute refractive index of the material of the prism is 1.5]

A41.8°

B48.2°

C60.8°

D90.0°

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Question 531

waec 2017

Plane waves through a narrow gap emerge as circular waves. This phenomenon is known as

Ainterference

Bdispersion

Crefraction

Ddiffraction

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Question 532

waec 2017

Consider the wave equation: \(y = 10sin(x - 50t)\), What does the number 10 represent?

AAcceleration

BSpeed

CAmplitude

DWavelength

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Question 533

waec 2017

Which of the following statements about the 3rd overtone of a vibrating air column of an open pipe is correct? It has

A4 nodes

B5 nodes

C3 antinodes

D4 antinodes

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Question 534

waec 2017

A rainbow is formed when sunlight is incident on water droplets suspended in the air due to

Ainterference

Brefraction

Cdispersion

Ddiffraction

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Question 535

waec 2017

The diagram above illustrates two waves of equal amplitudes A and frequencies approaching each other. When the two waves meet at a point I midway between them, the vertical displacement of the resulting wave will be

B\(\frac{A}{2}\)

C\(\frac{A}{4}\)

D\(2A\)

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Question 536

waec 2017

A vapour whose molecules are in dynamic equilibrium with those of its own liquid is said to be

Aunsaturated

Bgaseous

Csaturated

Ddiffused

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Question 537

waec 2017

The maximum density of water occurs at a temperature of

A0°C

B4°C

C37°C

D273°C

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Question 538

waec 2017

Thermal energy added or removed from a substance that changes the state of the substance is called

Alatent heat

Bheat of reaction

Ccalorimetry

Dspecific heat

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Question 539

waec 2017

A motor of a corn mill machine operates on electrical energy of \(1.44 \times 10^{5}\)J. If one-quarter of the energy is wasted on sound and heat, determine the efficiency of the machine.

A25%

B36%

C64%

D75%

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Question 540

waec 2017

Which of the following devices converts light energy to electrical energy?

ABulb

BTelevision

CSolar cell

DLight emitting diode (LED)

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