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1,904 questions

Question 1 of 20 1,904 total questions

Question 341

waec 2012

Which of the following substances is the most volatile at room temperature?

Awater

Bdiesel

Cpetrol

Dkerosine

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Question 342

waec 2012

The movement of fluid up or down a narrow tube is

Aosmosis

Bbrownian motion

Ccapillarity

Ddiffusion

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Question 343

waec 2012

A metal ball of weight W falls through a column of glycerine of viscosity V. If the ball experiences an upthrust U and terminal velocity is attained, then

AW > U + V

BW = U + V

CW = U - V

DW < U + V

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Question 344

waec 2012

A block of wood of density 0.6 gcm\(^{-3}\), weighing 3.06N in air, floats freely in a liquid of density 0.9 gcm\(^{-3}\). Calculate volume of the portion immersed (g = 10ms\(^{-2}\))

A510cm³

B340cm³

C254cm³

D170cm³

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Question 345

waec 2012

Which of the following devices is used to determine the relative density of an acid?

Amanometer

Bhydrometer

Chypsometer

Dhygrometer

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Question 346

waec 2012

The diagram above illustrates trapped air in a syringe placed in water that is gradually heated. It is observed that the piston rises as the temperature of the water rises. Which of the following statements explains this observation?

Afrequency of collision of trapped air molecules with walls of the syringe is more

Bmolecules of trapped air expands more

Cspeed of the trapped air molecules decreases

Dnumber of molecules of trapped air increases

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Question 347

waec 2012

The derived unit of pressure can be expressed as

Akgms^-2

Bkg m^-1s^-2

Ckg m^-2s^-2

Dkg m^-1s²

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Question 348

waec 2011

Using the circuit diagram above. Calculate the potential difference across the capacitors in parallel

A10.0V

B8.0V

C6.7V

D2.0V

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Question 349

waec 2011

Using the circuit diagram above. Calculate the total charge in the circuit

A80\(\mu C\)

B35\(\mu C\)

C20\(\mu C\)

D16\(\mu C\)

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Question 350

waec 2011

Nuclear fusion is not used as a source of enegy because

Avery high temperature is needed for the reaction

Bthe fuel for the reaction is not easy to obtain

Cless energy is released

Dthe reaction is too slow

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Question 351

waec 2011

The change in mass of fuel during a nuclear reaction is 2.0 x 10^-27 kg. Calculate the amount of energy released. (Speed of light = 2.0 x 10⁸ms^-1)

A1.8 x 10^-10J

B9.0 x 10^-11J

C6.0 x 10^-19J

D1.2 x 10^-45J

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Question 352

waec 2011

Uranium-234 disintegrated to form Thorium-230 by emitting

Aalpha particles

Bgamma rays

Cbeta negative rays

Dbeta positive rays

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Question 353

waec 2011

Which of the following properties is not applicable to X-rays? They

Atravel in straight lines

Btravel with the speed of light

Care deflected by magnetic field

Daffect photographic films

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Question 354

waec 2011

For photoelectric emission, the threshold frequency is the

Amaximum frequency of incident radiation that will eject elecrons

Bminimum fraquency of incident radiation required to eject elecrons

Cfrequency which results in the emission of the greater number of electrons

Dfraquency whch impacts greatest kinetic energy to emitte electrons

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Question 355

waec 2011

Which of the following practices will lead to losses in electrical power transmission?

Ausing transmission cables of large diameter

Btransmitting at high voltage and low current

Ctransmitting at relatively low voltage and high current

Dusing a set-up transformer at the production end

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Question 356

waec 2011

A wire of length 30cm is moved with a speed of 2ms^-1 at right angles to a magnetic field of flux density 0.4T. calculate the emf induced in the wire

A0.15V

B0.24V

C2.70V

D24.00V

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Question 357

waec 2011

The resistivity, \(\mathit{P}\), of a material of length l, cross-sectional area A, resistance R, is given by the equation

A\(\mathit{P} = \frac{RA}{l}\)

B\(\mathit{P} = \frac{l}{RA}\)

C\(\mathit{P} = \frac{Rl}{A}\)

D\(\mathit{P} = \frac{R}{Al}\)

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Question 358

waec 2011

An ammeter with a full scale deflection of 10mA has an internal resistance 0.5\(\Omega\). calculate the resistance of the shunt required to adapt it to read up to 3A

A0.0167\(\Omega\)

B0.0130\(\Omega\)

C0.0250\(\Omega\)

D0.1000\(\Omega\)

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Question 359

waec 2011

The unit of capacitance is

Afarad

Bcoulomb

Chenry

Dohms

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Question 360

waec 2011

Which of the following substances does not conduct electricity?

Agraphite

Bglass

Csulphuric acid

Dtable salt solution

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