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51 questions

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Question 21

waec 2000

The bob of a simple pendulum takes 0.25s to swing from its equilibrium position to one extreme end. Calculate its period

A0.25s

B0.50s

C0.75s

D1.00s

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Question 22

waec 2000

The resultant of two forces acting on an object is maximum when the angle between them is?

A180^o

B90^o

C45^o

D0^o

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Question 23

waec 2000

A uniform metre rule of mass 90g is provided at the 40cm mark. If the rule is in equilibrium with an unknown mass m placed at the 10cm mark and a 72g mass at the 70cm mark, determine m

A72g

B102g

C298g

D504g

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Question 24

waec 2000

A bus travelling at 15ms\(^{-1}\) accelerates uniformly at 4ms\(^{-2}\), what is the distance covered in 10s?

A150m

B170m

C350m

D600m

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Question 25

waec 2000

The driver of a car moving with uniform speed of 40ms-1 observes a truck approaching from the opposite direction with a speed of 20ms-1. Calculate the speed of the car relative to that of the truck

A.5ms^-1

B2.0ms^-1

C20.0ms^-1

D60.0ms^-1

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Question 26

waec 2000

A ball bearing is gently released from rest and allowed to fall through a viscous fluid. Which of the following statements about the motion is correct?

Aits acceleration decreases before terminal velocity is attained

Bwhen terminal velocity is attained the acceleration of the fluid becomes zero

Cits velocity increases before terminal velocity is attained

Dthere is no resultant force on the ball before it attains terminal velocity

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Question 27

waec 2000

A wooden block of mass 1.6kg rests on a rough horizontal surface if the limiting friction force between the block and the surface is 8N. Calculate the coefficient of friction. (g = 10ms-2)

A0.6

B0.5

C0.3

D0.2

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Question 28

waec 2000

The apparent weight of a body wholly immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. (Density of water = 1000kgm-3, g = 10ms\(^{-2}\))

A8.9 x 10^-3m³

B6.4 x 10^-3m³

C3.2 x 10^-3m³

D3.0 x 10^-3m³

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Question 29

waec 2000

A uniform cylindrical hydrometer of mass 20g and cross sectional area 0.54cm2 floats upright in a liquid. If 25cm of its length is submerged, calculate the relative density of the liquid. (Density of water = 1 gcm-3)

A1.54

B1.48

C1.25

D0.80

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Question 30

waec 2000

An iron rod is moved from the earth to the moon. Which of the following properties of the rod would remain unchanged? i. mass ii. weight iii. relative density

Ai only

Bii only

Ciii only

Di and iii only

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Question 31

waec 2000

The diagram above illustrates three forces T\(_1\), T\(_2\) and 100N in equilibrium. Determine the magnitude of T\(_1\).

A100 tan 30^o

B\(\frac{100}{\cos 30^o}\)

C200 sin 30¹

D\(\frac{200}{tan 30^o}\)

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