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49 questions

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Question 21

jamb 1985

Two masses 40g and 60g respectively, are attached firmly to the ends of the light meter rule. The center of gravity of the system is

Aat the mid-point of the meter rule

B40cm from the lighter mass

C40cm from the heavier mass

D60cm from the heavier mass

Eindeterninate because the meter-rule is light

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Question 22

jamb 1985

Which of the following is NOT a force?

AFriction

BTension

CUpthrust

DWeight

EImpulse

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Question 23

jamb 1985

A metal block of mass 5kg lies on a rough horizontal platform. If a horizontal force of 8N applied to the block through its center of mass just slides the block on the platform, then the coefficient of limiting friction between the block and platform is

A0.16

B0.63

C0.80

D1.60

E2.00

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Question 24

jamb 1985

A block of mass 2.04kg resting on a smooth horizontal plane is acted upon simultaneously by two-forces, 10N due North and 10N due East. The magnitude of the acceleration produced by the force on the block is

A0.10ms^-2

B7.07ms^-2

C10.00ms^-2

D14.10ms^-2

E20.00ms^-2

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Question 25

jamb 1985

If a car starts from rest and moves with a uniform acceleration of 10ms^-2 for ten seconds, the distance it covers in the last one second of its motion is

A95m

B100m

C500m

D905m

E1000m

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Question 26

jamb 1985

Which of the following types of motion are oscillatory? i.a diving board when used by a diver. ii. the motion of the balance wheel of a wrist watch. iii. the motion of the turn-table of a record player. iv. the motion of the center of a ten kobo piece as it rolls down an inclined plane. v. the motion of the needle of a D.C. ammeter into which a low A.C. current is passed

Ai and ii

Bi, ii and iii

Cii, ii and iv

Di, ii and v

Eiii, iv and iv

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Question 27

jamb 1985

Which of the following statements are true about the spring balance and the chemical balance? i. both are used to measure the mass of an object. ii. either of them may be used to measure the weight of an object. iii. the spring balance works on the principle of Hooke's law while the chemical balance works on the principle of moments. iv. a change in gravity does the readings of a spring balance but not that of a chemical balance.

Ai, and iv

Bii and iii

Cii and iv

Di, ii and iii

Ei and iii

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Question 28

jamb 1985

A simple pendulum with a period of 2.0s has its length doubled. Its new period is

A1.00s

B1.41s

C0.3s

D2.83s

E4.00s

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Question 29

jamb 1985

Which of the following is NOT a fundamental S.I unit?

AMeter

BAmpere

CKelvin

DSeconds

ERadian

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