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45 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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45 questions

Question 1 of 5 45 total questions

Question 21

neco 2003

A machine has an efficiency of 80%. If the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio.

A0.53

B0.83

C1.20

D1.50

E1.88

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Question 22

neco 2003

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

A2.0 × 10⁴J

B1.0 × 10⁴J

C5.0 × 10³J

D4.0 × 10³J

E2.0 × 10²J

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Question 23

neco 2003

Evaporation of a liquid produces cooling of the liquid because the

Aattraction between the vapour molecules and the liquid molecules is great

Baverage kinetic energy of the liquid is reduced

Cdensity of the liquid decreases

Dvapour pressure above the liquid rises

Evolume of the liquid decreases

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Question 24

neco 2003

Which of the following instruments can be used to measure e.m.f. most accurately.

AAmmeter

BGalvanometer

CMetre bridge

DPotentiometer

EVoltmeter

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Question 25

neco 2003

Young’s modulus of elasticity is the ratio of stress to strain, provided the load does not exceed the

Abreaking point

Belastic limit

Cplastic limit

Dstress limit

Eyield point

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