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145 questions

Question 1 of 20 145 total questions

Question 51

jamb 2002

A current of 0.5 A flowing 3h Deposits 2g of metal during electrolysis. The quantity of the same metal that would be deposited by the currents of 1.5A flowing in 1h is

A2g

B6g

C10g

D18g

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Question 52

jamb 2002

At what frequency would a capacitor of 2.5μF used in the radio circuit have a reactance of 250Ω

A\(\frac{π}{800}\) Hz

B\(\frac{800}{\pi}\) Hz

C200π Hz

D2000π Hz

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Question 53

jamb 2002

The carbon-granules microphone works on the principle of change in

Ainductance

Bresistance

Ccapacitance

Dvoltage

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Question 54

jamb 2002

A transistor is used in the amplification of signals because it

Acontrols the flow of current

Bconsumes a lot of power

Callows doping

Dcontains electron and hole carriers

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Question 55

jamb 2002

The particle that is responsible for the nuclear fission in a nuclear reactor is

Aneutron

Bprton

Celectron

Dphoton

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Question 56

jamb 2002

From the generating station to each substation power is transmitted at a very high voltage so as to reduce

Ahysteresis loss

Beddy current loss

Cmagnetic flux leakage

Dheating in the coils

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Question 57

jamb 2002

The percentage of the original nuclei of the sample of a radioactive substance left after 5 half - lives is

A8%

B5%

C3%

D1%

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Question 58

jamb 2002

The energy associated with the photon of a radio transmission at 3 x 10⁵ Hz is
[h = 6.63 x 10^-34Js]

A2.00 x 10^-28J

B1.30 x 10^-28J

C2.00 x 10^{- 29}J

D1.30 x 10^-29J

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Question 59

jamb 2002

Pure silicon can be converted to a p-type by adding a controlled amount of

Atrivalent atoms

Btetravalent atoms

Cpentavalent atoms

Dhexavalent atoms

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Question 60

jamb 2002

\(^{23}_{11}\)Na + X → \(^{20}_9\)F + \(^4_2\)He

What particle is X in the reaction above?

AAlpha

BBeta

CNeurons

DGamma

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Question 61

jamb 2002

an electric cell with nominal voltage E has a resistance of 3Ω connected across it. If the voltage falls to 0.6E, the internal resistance of the cell is

A1Ω

B2Ω

C3Ω

D4Ω

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Question 62

jamb 2002

The electromagnetic wave that can produce a heating effect on the environment is

Ax -rays

Bultraviolet rays

Cinfrared rays

Dgamma rays

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Question 63

jamb 2002

The electric field between two - point charges is shown in the diagram above. What types of charges are at X and Y?

ABoth X and Y are negative

BBoth X and Y are positive

CX is positive and Y is negative

DX is negative and Y is positive

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Question 64

jamb 2002

An electric iron is rated 1000W, 230V. What is the resistance of its elements?

A51.9Ω

B52.9Ω

C55.9Ω

D57.6Ω

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Question 65

jamb 2002

The eye controls the amount of light reaching the retina by adjusting the

Acornea

Biris

Cretina

Doptic nerve

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Question 66

jamb 2002

When connected to a mains of 250V, the fuse rating in the plug of an electric device of 1 KW is

A2 A

B3 A

C4 A

D5 A

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Question 67

jamb 2002

The energy stored in a capacitor of capacitance 10μF carrying a charge of 100μC

A5 x 10⁴ J

B4 x 10² J

C4 x 10^-3 J

D5 x 10^-4 J

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Question 68

jamb 2002

From the diagram above, determine the value of the resistance X

A6Ω

B9Ω

C12Ω

D15Ω

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Question 69

jamb 2002

Calculate the refractive index of the material for the glass prism in the diagram above

A^√2/₂

B⁴/₃

C√2

D³/₂

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Question 70

jamb 2002

The diagram above shows the force (F) acting on an object through a distance (x). The work done on this object is expressed as

AFx J

B^Fx/₂ J

CFx² J

D^F/_x J

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