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4,719 questions

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Question 371

jamb 2020

A few grains of table salt were put in a cup of cold water, kept at constant temperature and left undistributed. Eventually all the water tested salty. This action is due to?

Aconvection

Bosmosis

Ccapillarity

Ddiffusion

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Question 372

waec 2019

Open Photo

The graph above illustrates the variation of temperature \(\theta\) with time (t) for a solid that is being heated. Which processes take place at segments P and Q respectively?

AFreezing and vaporization

BEvaporation and solidification

CMelting and boiling

DCondensation and evaporation

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Question 373

waec 2019

When ultraviolet light is incident on certain metallic p articles are emitted. These particles are called

Apositrons

Bprotons

Cphotoelectrons

Dphotons

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Question 374

waec 2019

Which of the following properties is not exhibited by sound waves?

ADiffraction

BPolarization

CInterference

DReflection

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Question 375

waec 2019

Which of the following statements about a neutral atom is correct? The

Acore is composed of electrons and protons

Bnumber of electrons is equal to that of neutron

Cnumber of neutrons is equal to that of protons

Dnumber of protons is equal to that of electrons.

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Question 376

waec 2019

The area under a velocity-time graph represents

Aspeed

Bacceleration

Cmoment

Ddistance

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Question 377

waec 2019

An instrument used to measure relative humidity is the?

Ahygrometer

Bhydrometer

Cpyrometer

Dmanometer

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Question 378

waec 2019

The nucleon and proton numbers of a neutral atom of an element are 238 and 92 respectively. Determine the number of neutrons in the atom.

A119

B330

C165

D146

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Question 379

waec 2019

Which of the following liquids has the highest surface tension?

ASoapy water

BCold water

CHot water

Doily water

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Question 380

waec 2019

Which of the following materials does not serve as a safety device in electrical circuits?

AConnecting wires

BEarth wire

CFuse

DSwitch

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Question 381

waec 2019

In the diagram above, the time taken to trace a wave between P and Q is?

A2 periods

B1 period

C1\(\frac{1}{2}\) periods

D1\(\frac{1}{4}\) periods

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Question 382

waec 2019

Which of the following thermometers is used to measure the temperature of the human body?

AThermocouple

BAlcohol-in-glass thermometer

CGas thermometer

DPlatinum resistance thermometer

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Question 383

waec 2019

Open Photo

The diagram above illustrates an object moving in a circular path at a constant speed. Which of the arrows indicates the direction of linear velocity?

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Question 384

waec 2019

Two bodies of masses 3.0 kg and 2.0 kg are separated by a distance of 50 cm. Calculate the force of attraction between them. [G = 6.67 x 10\(^{-11}\) Nm\(^2\) kg\(^2\)]

A1.6 x 10\(^{-9}\)N

B1.3 x 10\(^{3}\)N

C2.3 x 10\(^{3}\)N

D5.0x 10\(^{3}\)N

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Question 385

waec 2019

A rectangular piece of iron measuring 4 cm by 3 cm at 20\(^o\)C is heated until its temperature increases by 100 C. Calculate the new area of the metal. [Linear expansivity of iron is 1.2x 10\(^{-5}\) K\(^{-1}\)]

A12.0144 cm\(^3\)

B12.0346 cm\(^3\)

C12.0288 cm\(^3\)

D12.0173 cm\(^3\)

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Question 386

waec 2019

A ray of light traveling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30. Calculate its angle of refraction.

A48.6°

B19.5°

C20.0

D45.0

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Question 387

waec 2019

The anomalous expansion of water occurs in the range

A0 °C to 100 °C

B0 °C to 4 °C

C4 °C to 100 C

D-4 °C to 0 °C

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Question 388

waec 2019

Which property of a wave remains constant when the wave travels from one medium into another?

AAmplitude

BWavelength

CVelocity

DFrequency

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Question 389

waec 2019

A device consumes 100 W of power when connected to a 120 V source. Calculate its resistance.

A1.2\(\Omega\)

B12,000 \(\Omega\)

C20.0\(\Omega\)

D144\(\Omega\)

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Question 390

waec 2019

An electron of mass 9.1 x 10\(^{-31}\) kg moves with a speed of 2.0 x 10\(^6\) ms\(^{-1}\) round the nucleus of an atom in a Circular path of radius

6.1 x 10\(^{11}\) m. Calculate the centripetal force acting on the electron.

A7.7 x 10\(^{47}\) N

B6.0 x 10\(^{-8}\)N

C3.0 x 10\(^{-14}\)N

D1.3 x 10\(^{-26}\)N

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