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49 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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49 questions

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Question 21

jamb 1992

If a plastic sphere floats in water (density = 1000kgm3) with 0.5 of its volume submerged, and floats in oil with 0.4 of its volume submerged the density of the oil is

A800kgm³

B1200kgm³

C1250kgm³

D2000kgm³

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Question 22

jamb 1992

In an experiment to determine Young's Modulus for a wire, several loads are attached to the wire and the corresponding extension measured. The tensile stress in each case depends on the

Aload and the extension

Bload and the radius of the wire

Cradius of the wire and the extension

Dextension and the original length of the wire

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Question 23

jamb 1992

A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the

A80%

B75%

C50%

D33%

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Question 24

jamb 1992

A man weight 800N climbs up a stairs to height of 15m in 12.5s. What is the man''s average power output?

A667W

B810W

C960W

D15000W

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Question 25

jamb 1992

A stone, Q is thrown with velocity U at an angle of 75^o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15^o to the horizontal. The ranges covered by the stones will be

Agreater for Q

Bgreater for R

Cthe same for Q and R

Dgreater for the heavier of the two stones

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Question 26

jamb 1992

A body starts from rest and moves with a uniform acceleration of 6 ms \(^{-2}\). What distance does it cover in the third seconds

A15m

B18m

C27m

D30m

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Question 27

jamb 1992

A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall

Ain front of his palm

Bbehind his palm

Cbeside his palm

Dinto his palm

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Question 28

jamb 1992

Which of the following affects the period of a simple pendulum? i. mass of the pendulum bob. ii. length of the pendulum. iii. acceleration due to gravity.

Ai, ii, and iii

Bii and iii only

Ci and iii only

Di and ii only

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Question 29

jamb 1992

What is the least possible error in using a rule graduated in centimeters?

A0.1cm

B0.5cm

C1.0cm

D2.0cm

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