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45 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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45 questions

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Question 21

jamb 1989

A block-and-tackle system is used to lift a load of 20N through a vertical height of 10m. if the efficiency of the system is 40%, how much work is done against friction?

A80J

B120J

C300J

D500J

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Question 22

jamb 1989

A thin film of liquid is trapped between two glass plates. The force required to pull the plates apart will increase if the

Asurface tension of the liquid is reduced

Bperpendicular distance between the plates is increased

Carea of the liquid surface in contact with the plates is increased

Dpressure of the air is decreased

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Question 23

jamb 1989

Two points on a velocity time-graph have coordinates (5s, 10ms^-1) and (20s, 20ms^-1). Calculate the mean acceleration between the two points

A0.67ms^-1

B0.83ms^-1

C1.50ms^-1

D2.00ms^-1

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Question 24

jamb 1989

The magnitude of the resultant of two mutually perpendicular forces, F₁ and F₂ is 13N, if the magnitude of F₁ is 5N, what is the magnitude of F₂?

A2.6N

B6.0N

C12.0N

D18.0N

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Question 25

jamb 1989

Which of the following is a set of vectors?

Aforce, mass and moment

Bacceleration, velocity and moment

Cmass, weight and density

Dmass, volume and density

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