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61 questions

Question 1 of 20 61 total questions

Question 1

waec 1996

The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days, what would be the count rate per minute after 15 days?

A20

B25

C50

D200

E400

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Question 2

waec 1996

Which of the following particles/rays do not originate from the nucleus of an atom?

AAlpha particles

BBeta particles

CNeutrons

DGamma rays

EX-rays

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Question 3

waec 1996

Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?

ACarbondioxide gas

BLiquid sodium metal

CConcrete shield

DGraphite rods

EBoron rods

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Question 4

waec 1996

Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?

ACarbondioxide gas

BLiquid sodium metal

CConcrete shield

DGraphite rods

EBoron rods

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Question 5

waec 1996

Which of the following is not part of the electromagnetic spectrum?

ARadio wave

BGamma ray

CInfra-red ray

DAlpha particle

EX-ray.

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Question 6

waec 1996

Which of the following substances is most viscous at room temperature?

AWater

BAlcohol

CPetrol

DPalm oil

EKerosine

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Question 7

waec 1996

What is the decay constant of a radioactive element whose half-life is 3 seconds

A0.132s^-1

B0.23s^-1

C0.347s^-1

D0.693s^-1

E0.924s^-1

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Question 8

waec 1996

The resistance in a series R-C circuit is 5 Ω. If the impedance of the circuit is 13 Ω, calculate the reactance of the capacitor

A65 Ω

B18 Ω

C16 Ω

D14 Ω

E12 Ω

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Question 9

waec 1996

ln the diagram above, the resistor has a resistance 8 Ω while the reactances of the inductor and the capacitor are 10 Ω and 16 Ω respectively Calculate the current in the circuit

A3.6A

B3.8A

C9.2A

D10.0A

E13.0A

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Question 10

waec 1996

Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5A is passed through for 100s.

A20,000J

B10,000J

C5,000J

D4,000J

E200J

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Question 11

waec 1996

The electric potential at point P in the diagram above can be expressed as

AQ²/(4πε_or²)

BQ/(4πε_or²)

CQ/(4πε_or)

DQ²/(4πε_or²)

EQ/(4πε_or) ²

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Question 12

waec 1996

The diagram above illustrates an isolated metal sphere carrying charge W in a medium whose permittivity is so. The magnitude of the electric field intensity at P can be expressed as

AQ²/(4πε_or²)

BQ/(4πε_or²)

CQ/(4πε_or)

DQ²/(4πε_or²)

EQ/(4πε_or) ²

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Question 13

waec 1996

Soft iron is used in making the armature of an electric bell because it

Aretains its magnetism for a longtime

BLoses its magnetism readily

CProduces permanent magnets

Dis not easily magnetised

Edecreases the magnetic effect of a direct current

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Question 14

waec 1996

A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 39. A high-resistance voltmeter connected across the cell registers only 0.9V. Calculate the internal resistance of the cell

A1.85Ω

B2.0Ω

C2.4Ω

D4.5Ω

E5.0Ω

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Question 15

waec 1996

Lenz's law of electromagnetic induction states that

Ae.m.f. is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit.

Bthe induced current in a conductor is in such a direction as to oppose the change producing it

Cthe magnitude of the induced e.m.f. in a circuit is proportional to the rate of change of the number of lines of force linking the circuit

Da force is exerted on a current-carrying conductor in a magnetic Held

Ethe induced charge is constant for a fixed change of flux.

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Question 16

waec 1996

A wire of length 100cm and cross-sectional area of 2.0 x 10-3cm2 has a resistance of 0.10 Ω. Calculate its electrical conductivity.

A5.0 x 10⁷Ω^-1cm^-1

B5.0 x 10⁶Ω^-1cm^-1

C2.0 x 10⁶Ω^-1cm^-1

D5.0 x 10⁵Ω^-1cm^-1

E2.0 x 10⁶Ω^-1cm^-1

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Question 17

waec 1996

The diagram above illustrates the conversion of a galvanometer of resistance 29 to an ammeter. The galvanometer gives a full-scale deflection for a current of 10mA. Calculate the value of R.

A2.0 x 10³ Ω

B2.0 x 10² Ω

C2.0 x 10^-1 Ω

D2.0 x 10^-2 Ω

E2.0 x 10^-3 Ω

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Question 18

waec 1996

Which of the following is not a component of a d.c. electric motor?

ACommutator

BField magnets

CSlip rings

DArmature

ECarbon brushes

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Question 19

waec 1996

The main function of the mouth of a telephone is to convert sound energy into

Aheat energy

Blight energy

Cchemical energy

Delectrical energy

Emechanical energy

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Question 20

waec 1996

CalcuIate the power delivered by a 3-phase line if its voltage and current at 132KV and 60A respectively.

A2.38 x 10⁷W

B7.92 x 10⁶W

C3.96 x 10⁶W

D2.64 x 10⁶W

E7.92 x 10⁴W

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