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1,904 questions

Question 1 of 20 1,904 total questions

Question 211

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 212

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 213

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 214

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 215

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 216

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 217

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 218

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 219

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 220

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 221

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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Question 222

waec 2017

The diagram above illustrates a beaker of water being heated. It is observed that as the bubbles rise they get bigger in size.The reason for this observation is

Awater pressure on the bubbles decreases

Bdensity of water increases with rise in temperature

Cvolume of water increases with rise in temperature

Datmospheric pressure on the bubbles decreases

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Question 223

waec 2017

A plane is inclined at an angle \(\theta\) to the horizontal. Its velocity ratio is

A\(sin\theta\)

B\(tan\theta\)

C\(\frac{1}{sin\theta}\)

D\(\frac{1}{tan\theta}\)

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Question 224

waec 2017

Ice of mass 50g at 0°C was completely melted by 70% of the total heat energy supplied. Calculate the total heat energy supplied [Specific latent heat of fusion of ice = 336\(Jg^{-1}\)]

A2400J

B6800J

C7251J

D24000J

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Question 225

waec 2017

The energy stored in a spring of stiffness constant k = 2000\(Nm^{-1}\) when extended 4cm is

A0.16J

B1.60J

C16.00J

D160.00J

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Question 226

waec 2017

Which of the following graphs correctly represents the relationship between the kinetic energy (K.E) and the displacement (d) from point of release of a swinging pendulum bob?

BII

CIII

DIV

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Question 227

waec 2017

A body can undergo the following types of motion except

Arandom

Brotational

Ctranslational

Drelative

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Question 228

waec 2017

The angle at which a projectile must be fired to cover maximum range is

A30°

B45°

C60°

D90°

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Question 229

waec 2017

A motorist travelling at 72\(kmh^{-1}\) had his eyes shut for 0.4s during a hard sneeze. Calculate the distance covered by him during this time interval.

A50.0m

B28.8m

C18.0m

D8.0m

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Question 230

waec 2017

A body is whirled round a circular path at constant speed. Which of the following diagrams correctly indicates the direction of the body's velocity (v) and its acceleration (a)?

BII

CIII

DIV

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