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1,904 questions

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Question 81

waec 2022

The diameter of a brass ring at 30 °C is 50.0 cm. To what temperature must this ring be heated to increase its diameter to 50.29 cm? [ linear expansivity of brass = 1.9 x 10\(^{-5}\) K\(^{-1}\)]

A152.6 °C

B182.6 °C

C306.1 °C

D335.3 °C

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Question 82

waec 2022

Which of the following statements-about electromagnetic waves is not correct?

AThey carry energy as they travel through space

BThey travel with the speed of light

CThey are longitudinal

DThe electric and magnetic fields are at right angles to each other

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Question 83

waec 2022

The distance between the fixed points of a mercury-in-glass thermometer is 30 cm. Determine the temperature when the mercury level is 10.5 cm above the lower fixed point

A28.6ºC

B30.0 ºC

C35.0 ºC

D40.5 ºC

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Question 84

waec 2022

A hunter fires a gun at a point 408 m away from a cliff. If he hears an echo 2.4 s later, determine the speed of the sound wave

A340 ms\(^{-1}\)

B380 m s\(^{-1}\)

C400 m s \(^{-1}\)

D680 m s\(^{-1}\)

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Question 85

waec 2022

When the direction of vibration of the particles of a medium is perpendicular to the direction of propagation of a wave, the wave is said to be--------

Alongitudinal

Btransverse

Cmechanical

Da sound wave

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Question 86

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 87

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 88

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 89

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 90

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 91

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 92

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 93

waec 2022

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

Amaximum

Bminimum

Ccapacitive

Dinductive

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Question 94

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 95

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 96

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 97

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 98

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 99

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 100

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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