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1,904 questions

Question 1 of 20 1,904 total questions

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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Question 31

waec 2024

The diagram above illustrates the graph for

Athe variation of the volume of a gas with increasing temperature

Bexpansion curve of mercury

Cexpansion curve of liquid oxygen

Danomalous expansion of water

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Question 32

waec 2024

The constant temperature at which a liquid change into gaseous state is known as

Aevaporation point

Bboiling point

Cmelting point

Ddew point

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Question 33

waec 2024

Water is readily available but it is not a thermometric liquid mainly because

Aclings to glass

Bdoes not expand uniformily

Cboils at low temperature

Dis colourless

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Question 34

waec 2024

The amount of heat energy that will be extracted when 0.02kg of water vapor condenses to water at 97ºC is [specific heat capacity of water = 4200Jkg\(^{-1}\)k\(^{-1}\), Specific heat of vaporization of water = 2.26 x 10\(^6\)Jkg\(^{-1}\)]

A45,452J

B45,200J

C25,200J

D252J

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Question 35

waec 2024

A convex mirror is used as a driving mirror; however, a disadvantage in this regard is that the image

Ait produces is virtual

Bit produces is real

Cis not as bright as we would like

Dappears farther away from the driver

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Question 36

waec 2024

Which of the following factors does not affect the speed of sound?

ALoudness.

BWind direction

CTemperature

DMaterial density

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Question 37

waec 2024

In storing magnets, the keeper is used to

Acancel the effect of the earth's magnetism

Breduce self demagnetization

Cprotect the magnet from stray electric field

Dincrease the strength of the magnet.

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Question 38

waec 2024

A galvanometer of full-scale deflection 10 mA has a resistance of 5\(\Omega\). Calculate the shunt needed to convert it to measure currents of 2 A.

A0.025\(\Omega\)

B0.050\(\Omega\)

C0.250\(\Omega\)

D0.500\(\Omega\)

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Question 39

waec 2024

A non-conducting vessel contains a liquid of mass 70 g at 25º C. Another 70.0g of the same liquid at 35ºC is quickly poured into the vessel. Determine the final temperature of the mixture

A15ºC

B20ºC

C30ºC

D40ºC

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Question 40

waec 2024

The maximum displacement of particles from equilibrium position in a wave motion is known as

Awave length.

Bamplitude.

Cfrequency.

Dpolarization.

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