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57 questions

Question 1 of 17 57 total questions

Question 21

waec 1995

The temperature of glass vessel containing 100cm3 of mercury is raised from 10oC to 100oC. Calculate the apparent cubic expansion of the mercury. (Real cubic expansivity of mercury = 1.82 x 10-4K-1) (Cubic expansivity of glass = 2.4 x 10-5K-1)

A0.52cm³

B1.42cm³

C1.87cm³

D5.22cm³

E14.22cm³

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Question 22

waec 1995

The pressure of a given mass of gas changes from 200 Nm2 to 100 N m2, while its temperature drops from 127oC to - 73oC. Calculate the radio of the final volume of the gas to its initial volume.

A2.4:1

B2.0:1

C1.2:1

D1.0:1

E1.0:2

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Question 23

waec 1995

An air bubble of volume 2 cm\(^3\) is formed 20m under water. What will be its volume when it rises to just below the surface of the water if the atmospheric pressure is equivalent to a height of 10m of water?

A6cm³

B4cm³

C3cm³

D2cm³

E1cm³

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Question 24

waec 1995

Hot water at a temperature of t is added to twice that amount of water at a temperature of 30°C. If the resulting temperature of the mixture is 50°C. Calculate t.

A90^oC

B80^oC

C50^oC

D40^oC

E30^oC.

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Question 25

waec 1995

A body of specific heat capacity 450J kg^-1 K^-1 falls to the ground from rest through a vertical height of 20m. Assuming conservation of energy, calculate the change in temperature of the body on striking the ground level. (g = 10ms^-2)

A0^oC

B2/9^oC

C4/9^oC

D9/4^oC

E9/2^oC

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Question 26

waec 1995

A brass rod is 2 m long at a certain temperature. Calculate the linear expansion of the rod for a temperature change of 100K. (Take the linear expansivity of brass as 1.8 x 10'5K").

A0.3600 m

B0.1800 m

C0.0360 m

D0.0036m

E0.0018 m

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Question 27

waec 1995

A mercury-in-glass thermometer reads - 20^o at the ice point and 100^o at the steam point. Calculate the celcius temperature corresponding to 70^o on the thermometer.

A41.0^oC

B50.0^oC

C62.5^oC

D70.0^oC

E75.0^oC.

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Question 28

waec 1995

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

A13.0 N

B7.0 N

C3.3N

D3.0N

E0.3 N.

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Question 29

waec 1995

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

A0.7

B0.9

C1.5

D2.5

E10.0

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Question 30

waec 1995

A car travelling at a uniform speed of 120km h^-1 passes two stations in 4 minutes. Calculate the distance between the two stations.

A8km

B15km

C22km

D30km

E60km

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Question 31

waec 1995

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

AIncreasing the mass of the bob

BDecreasing the mass of the bob

CIncreasing the length of the string

DDecreasing the length of the string

EDecreasing the amplitude of oscillation

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Question 32

waec 1995

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

A0.0^o

B22.5^o

C30.0^o

D45. 0^o

E90.0^o

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Question 33

waec 1995

The angular speed of an object describing a circle of radius 4m with a linear constant speed of 10 ms-1 is

A40.00 rad s^-1

B14.00 rad s^-1

C2.50 rad s^-1

D1.58 rad s^-1

E0.40 rad s^-1

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Question 34

waec 1995

A body of mass 7.5 kg is to be pulled up along a plane which is inclined at 30^o to the horizontal. If the efficiency of the plane is 75%, what is the minimum force required to pull the body up the plane?
(g = 10ms^-1)

A5.0 N

B20.0 N

C50.0 N

D75.0 N

E200.0 N

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Question 35

waec 1995

A student found out from a simple pendulum experiment that 20 oscillations were completed in 38 seconds. What is the period of oscillation of the pendulum?

A8.0s

B3.8 s

C2.0 s

D1.9 s

E0.5s

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Question 36

waec 1995

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

A0.3ms^-1

B3.3ms^-1

C16.6ms^-1

D20.0ms^-1

E200.0ms^-1

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Question 37

waec 1995

Which of the following is a fundamental quantity?

AHeat capacity

BElectric current

CTorque

DReactance

EDensity

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