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50 questions

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Question 21

waec 2025

A body weighing 10N in air is partially immersed in water. It displaces water of mass 0.3kg. What is the upthrust on the body?(g = 10m/s\(^2\))

A7.0N

B13.0N

C3.3N

D3.0N

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Question 22

waec 2025

A machine has an efficiency of 60%. If the machine is required to overcome a load of 30N with a force of 20N. Calculate its mechanical advantage.

A1.5

B0.9

C0.7

D2.5

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Question 23

waec 2025

A car travelling at a uniform speed of 120km/hr passes two stations in 4minutes. Calculate the distance between the two stations.

A15km

B30km

C8km

D22km

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Question 24

waec 2025

Which of the following will reduce the frequency of oscillation of a simple pendulum?

AIncreasing the mass of the bob

BDecreasing the length of the string

CIncreasing the length of the string

DDecreasing the mass of the bob.

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Question 25

waec 2025

At what angle to the horizontal must the nozzle of a machine gun be kept when firing to obtain maximum horizontal range of the bullets?

A0.0º.

B30.0º.

C45.0º

D22.5º

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Question 26

waec 2025

The angular speed of an object describes a circle of radius 4m with linear constant speed of 10m/s is

A2.50 rads\(^{-1}\)

B1.58 rads\(^{-1}\)

C14.00 rads\(^{-1}\)

D40.00 rads\(^{-1}\)

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Question 27

waec 2025

A body of mass 7.5 kg is to be pulled along a plane which is inclined at 30º to the horizontal. If the efficiency of the plane is 75%, what is the minimum force required to pull the body up the plane?

A20.0N

B50.0N

C75.0N

D5.0N

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Question 28

waec 2025

A student found out from a simple pendulum experiment that 20 oscillations were completed in 38 seconds.

A8.0s

B3.8s

C1.9s

D2.0s

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Question 29

waec 2025

A boy cycles continuously through a distance of 1.0km in 5 minutes. Calculate his average speed.

A0.3m/s

B16.6m/s

C20.0m/s

D3.3m/s

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Question 30

waec 2025

Which of the following is a fundamental quantity?

ATorque

BReactance

CHeat capacity

DElectric current

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