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50 questions

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Question 21

waec 2005

A body starts from rest and accelerates uniformly at 5ms^-2 until it attains a velocity of 25ms-1. Calculate the time taken to attain this velocity

A2.5s

B5.0s

C10.0s

D125.0s

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Question 22

waec 2005

Which of the following type of motion does a body undergo when acted upon by a couple?V

Avibrational

Btranslational

Crotational

Drandom

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Question 23

waec 2005

Masses,m¹ and m² at the 20-cm and 65-cm marks respectively of a uniform metre rule freely suspended at its centre of gravity. If the metre rule balances horizontally, determine the ratio m² : m¹

A2 : 1

B3 : 3

C2 : 3

D1 : 2

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Question 24

waec 2005

A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine

A85%

B80%

C60%

D20%

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Question 25

waec 2005

Which of the following simple machines is a second class lever?

Awheel barrow

Bcrowbar

Cclaw hammer

Dseesae

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Question 26

waec 2005

A body of mass 25kg, moving at 3ms-1 on a rough horizontal floor, is at rest after sliding through a distance of 2.50m on the floor. Calculate the coefficient of sliding friction. [g = 10.0ms\(^{-2}\)]

A0.09

B0.18

C0.36

D0.54

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Question 27

waec 2005

The friction which exists between two layers of liquid in relative motion is called

Acapillarity

Bsurface tension

Cviscosity

Dcohension

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Question 28

waec 2005

Which of the following statements about a spring balance and/or a chemical balance is not correct?

Athe chemical balance operates on the principle of moments

Bthe sprin balance operates on Hooke's law

Ceither may be used to measure the weight of a substance

Dthe reading of a spring balance changes over the surface of the earth, while that of the chemical balance remaind constant

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Question 29

waec 2005

Each of the following physical quantities is classified as a vector or a scalar quantity. Which of the classifications is correct?

Aelectric potential (Vector)

Bmomentum (scalar)

Cgravitational field intensity (scalar)

Dmagnetic flux density (vector)

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Question 30

waec 2005

Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules?

ATranslational motion

Brotational motion

Cbrownian motion

Doscillatory motion

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