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4,719 questions

Question 1 of 20 4,719 total questions

Question 241

waec 2022

The half-life of a radioactive substance is 15 hours. If at some instance, the sample has a mass of 512 g, calculate the time it will take \(\frac{7}{8}\) of the sample to decay

A15 hours

B30 hours

C45 hours

D60 hours

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Question 242

waec 2022

Gamma rays are produced when?

Ahigh velocity electrons are abruptly stopped in metals

Benergy changes occur within the nuclei of atoms

Cenergy changes occur within the electronic structure of atoms

Delectrons are deflected in very strong magnetic fields

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Question 243

waec 2022

If the kinetic energy of an electron is 100 eV, what is the wavelength of the de-Broglie wave associated with it? [h = 6.6 x 10\(^{-34}\) J s, e = 1.6 x 10\(^{-19}\)C, m\(_{e}\), = 9.1 x 10\(^{-31}\) kg]

A1.22 x 10\(^{-10}\)m

B4.10 x 10\(^{-10}\)m

C3.90 x 10\(^{-10}\)m

D5.50 x 10\(^{-14}\)m

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Question 244

waec 2022

Arrange the following radiations in order of increasing ionization of air.

I. Alpha

Il. Gamma

IIl. Beta

AI < III < II

BII < I < III

CII < III < I

DI < II

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Question 245

waec 2022

In doping an intrinsic semiconductor to produce a p-type semiconductor,

Athe semiconductor is heated up

Ba donor element is added

Can acceptor element is added

Dthe semiconductor is conducted to a battery

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Question 246

waec 2022

One major reason why electrical appliances in homes are normally earthed is that the-----------

Aperson touching the appliance is safe from electric shock

Bappliances are maintained at a higher p.d. than the earth

Cappliances are maintained at a lower p.d. than the earth

Dappliances are maintained at the same p.d. with that of the earth

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Question 247

waec 2022

A lamp is rated 240 V, 60 W. Determine the resistance of the lamp when lit?

A120\(\Omega\)

B240\(\Omega\)

C540\(\Omega\)

D960\(\Omega\)

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Question 248

waec 2022

In a series R-L-C circuit at resonance, impedance is----

Amaximum

Bminimum

Ccapacitive

Dinductive

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Question 249

waec 2022

The speed of fast-moving neutrons in a nuclear reactor can be reduced by using?

Agraphite rods

Bconcrete shield

Ciron rods

Dboron rods

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Question 250

waec 2022

.An inductor of inductance 10 H is connected across an a.c circuit source of 50 V, 100 Hz. What is the current in the circuit? [\(\pi\) = 3.14]

A0.200A

B0.070A

C0.050A

D0.008A

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Question 251

waec 2022

A galvanometer with a full-scale deflection of 20 mA is Converted to read 8 K by connecting a 395 \(\Omega\) resistor in series with it. Determine the internal resistance of the galvanometer

A2.5\(\Omega\)

B5.0\(\Omega\)

C8.0\(\Omega\)

D10.0\(\Omega\)

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Question 252

waec 2022

Which of the following statements about electric potential energy is not correct?

AThe electric potential energy of a positively charged particle increases when it moves to a point of higher potential

BThe electric potential energy of a negatively charged particle increases when it moves to a point of lower potential

CThe electric potential energy of a positively charged particle decreases when it moves to a point of higher potential

DThe work done in taking a charged particle around a closed path in an electric field is zero.

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Question 253

waec 2022

Three cells each of emf, 1.0 V, and internal resistance, 2 \(\Omega\), are connected in parallel across a 3\(\Omega\) resistor. Determine the current in the resistor.

A0.90A

B0.39A

C0.30A

D0.01A

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Question 254

waec 2022

Which of the following statements about a straight current-carrying wire placed in a uniform magnetic field is correct? The wire experiences ---------------

Amaximum motor force if the current reverses its direction

Bno motor force of it is parallel to the field

Cno motor force if it is perpendicular to the field

Da motor force with constant direction if either the current or the magnetic field is reversed

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Question 255

waec 2022

A body of mass, M, moving with velocity, V, has a wavelength, X, associated with it. This phenomenon is called----------

Aphotoelectric effect

Bheisenberg's uncertainty principle

Ccompton effect

Dwave-particles paradox

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Question 256

waec 2022

The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called

Aferrite substance

Bparamagnetic substance

Cferromagnetic substance

Ddiamagnetic substance

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Question 257

waec 2022

The period of a 10 kHz radio wave traveling at 10\(^{8}\) ms\(^{-1}\) is--

A3.0 x 10\(^{-5}\)s

B1.0 x 10\(^{-4}\) s

C1.0 x 10\(^{4}\)s

D3.0 x 10\(^{4}\)s

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Question 258

waec 2022

Current is passed through two parallel conductors in the same direction. If the conductors are placed near each other, they will------------------

Amove in a circle

Brepel each other

Cremain stationary

Dattract each other

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Question 259

waec 2022

The reason for having a large number of turns in the coil of a moving coil galvanometer is to--------

Amake the deflection of the needle proportional to the current

Bincrease the sensitivity of the galvanometer

Cdecrease the magnetic flux produced by the magnet

Dmake the permanent magnet stronger

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Question 260

waec 2022

The power of the lens is +2.5D. What is the radius of the curvature?

A2.5 cm

B25.0 cm

C40.0 cm

D80.0 cm

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