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4,719 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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4,719 questions

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Question 1051

jamb 2007

The instantaneous value of the induced e.m.f as a function of time is ε = ε_o sin ωt where ε_o is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is

A0.00

B^ε_o/₄

C^ε_o/₂

Dε_o

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Question 1052

jamb 2007

In the diagram above , if the magnetic field points into the paper and the force on a current - carrying conductor points upwards, what is the direction of the current?

AUpwards

BDownwards

CRight

DLeft

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Question 1053

jamb 2007

Three cells each of e.m.f 1.5 V and internal resistance 2.5Ω are connected as shown in the diagram above. Find the net e.m.f and the internal resistance

A1.5V, 7.50Ω

B1,5V, 0.83Ω

C4.5V, 7.50Ω

D4.5V, 0.83Ω

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Question 1054

jamb 2007

The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is

A1600N

B400N

C160N

D40N

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Question 1055

jamb 2007

The ratio of the coefficient of linear expansion of two metals \(\frac{∝_1}{∝_2}\) is 3:4. If, when heated through the same temperature change, the ratio of the increase in length of the two metals, \(\frac{e_1}{e_2}\) is 1:2, the ratio of the original lengths \(\frac{l_1}{l_2}\) is

A⁸/₃

B³/₂

C²/₃

D³/₈

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Question 1056

jamb 2007

A blacksmith heated a metal whose cubic expansivity is 6.3 x 10\(^{-6}\)K\(^{-1}\). The area expansivity is

A2.0 x 10^-6K^-1

B2.1 x 10^-6K^-1

C4.2 x 10^-6K^-1

D6.3 x 10^-6K^-1

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Question 1057

jamb 2007

A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at the angle of 60^o to the floor. The work done after a distance of 3m is

A3 J

B4 J

C5 J

D6 J

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Question 1058

jamb 2007

In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?

A40N

B80N

C120N

D200N

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Question 1059

jamb 2007

From the diagram above, the bob of the pendulum has the fastest speed at

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Question 1060

jamb 2007

The figure above shows 4 forces 3N, 10N, 3√3N and 6N acting on a particle P. The resultant of he four forces is

A5N

B5√ 3N

C10N

D10√ 3N

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Question 1061

jamb 2007

Silicon doped with aluminum and germanium doped with arsenic become?

Ap- and n- types respectively

Bn- en p- type respectively

Cp- type semiconductor

Dn- type semiconductors

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Question 1062

jamb 2007

The bond that forms a semiconductor is?

Acovalent

Belectrovalent

Cionic

Dmetallic

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Question 1063

jamb 2007

The energy E of a photon and its wavelength are related by Eλ = X. the numerical value of X is?
[h = 6.63 x 10\(^{-34}\)js, c = 3 x 10\(^8\) ms\(^{-1}\)]

A6.6 X 10^-28

B1.99 X 10^-27

C6.60 x 10^-26

D1.99 x 10^-25

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Question 1064

jamb 2007

A charge 50 µc has electric field strength of 360 NC-1 at a certain point. The electric field strength due to another charge 120 µc kept at the same distance apart and in the same medium is?

A864 NC^-1

B150 NC^-1

C144 NC^-1

D18 NC^-1

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Question 1065

jamb 2007

The production of pure spectrum could easily be achieved using a?

Aglass prism with a pin

Btriangular prism with two convex lens

Ctraingular prism only

Dtriangular prism with two concave lenses

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Question 1066

jamb 2007

When an object is placed between the principal focus and the optical center of a convex lens, it could be used as a?

ASimple microscope

Brefecting lens

Ccompound microscope

Dprojector

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Question 1067

jamb 2007

A glass plate 0.9cm thick has a refractive index of 1.50. How long does it take for a pulse of light to pass through the plate?
[c = 3.0 x 10\(^8\) ms-1]

A4.5 x 10^-11s

B4.5 x 10^-10s

C4 .5 x 10^-12 s

D3.0 x 10^-10s

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Question 1068

jamb 2007

The instrument used by designers to obtain different color pattern is called?

Aperiscope

Bsextant

Cepiscope

Dkaleidoscope

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Question 1069

jamb 2007

The phenomenon of light bending round an obstacle is?

Adiffraction

Brefraction

Creflection

Dpolarization

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Question 1070

jamb 2007

In a large telecommunications auditorium, perforated absorbent materials are used to line the ceiling so as to

AIncrease the reverberation of sound in the hall

Bincrease the amount of echo in the hall

Creduce the hight of the ceiling from the floor

Dreduce the reverberation of sound in the hall

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