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98 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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98 questions

Question 1 of 20 98 total questions

Question 1

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 2

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 3

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 4

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 5

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 6

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 7

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 8

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 9

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 10

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 11

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 12

waec 2011

The unit of capacitance is

Afarad

Bcoulomb

Chenry

Dohms

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Question 13

waec 2011

Which of the following substances does not conduct electricity?

Agraphite

Bglass

Csulphuric acid

Dtable salt solution

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Question 14

waec 2011

When the pointed end of an uncharged optical pin is brought near the cap cf a positively charged electroscope, it is observed that the gold

Acollapse slowly

Bvibrate

Care not affected

Ddiverge rapidly

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Question 15

waec 2011

The capacitance of a parallel-plate capacitor

Adecreases when the seperation between the plate decreases

Bincreases when the optential difference between the plates is increased

Cis greater without a dielectric material between the plates than with a dielectric

Dis greater with a dielectric between the plates than without a dielectric.

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Question 16

waec 2011

The correct relationship between "G" and "g" in a gravitational field is given by the equation (Where the symbols have their usual meanings)

Ag = \(\frac{GM}{R}\)

Bg = \(\frac{GM}{R^2}\)

Cg = \(\frac{GM^2}{R}\)

Dg = \(\frac{GM^2}{R^2}\)

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Question 17

waec 2011

Which of the following statements about the electromagnetic waves is correct?

Aradio waves have longer frequencies than x-rays

Bx-rays have the longest wavelength

Csome of the waves travel at 3.0 x 10⁸ms^-1

Dwhite light occupies a region beyond ultraviolet rays

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Question 18

waec 2011

The main difference between echo and reverberation is that

Areverberation is reflected sound while echo is refracted sound

Bthe time interval between incident sound and reflecte sound is shorter for reverbration

Cthe amplitude of an echo is greater

Dreverberation is from acoustic speakers while echo comes from clifts

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Question 19

waec 2011

two sound waves have frequencies of 12Hz and 10Hz. Calculate their beats period

A0.5s

B1.0s

C1.2s

D2.0s

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Question 20

waec 2011

The focal length of the eye-piece of an astronomical telescope is f₁, while the focal length of the object is f₂. Fro normal adjustment, the angular magnification is given by

A\(\frac{f_2}{f_1}\)

B1 - \(\frac{f_2}{f_1}\)

C\(\frac{f_2}{f_1}\) - 1

D\(\frac{f_1}{f_2}\)

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