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4,719 questions

Question 1 of 20 4,719 total questions

Question 1751

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 1752

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 1753

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 1754

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 1755

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 1756

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 1757

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 1758

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 1759

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 1760

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 1761

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

View Explanation & Discuss

Question 1762

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 1763

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 1764

waec 1995

Which of the following is a fundamental quantity?

AHeat capacity

BElectric current

CTorque

DReactance

EDensity

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Question 1765

jamb 1995

The resultant capacitance in the fig above is

A15.0µF

B9.8µF

C1.3µF

D0.8µF

View Explanation & Discuss

Question 1766

jamb 1995

The fig above shows two similar bulbs X and Y connected to suitable power supply with F as an appropriate fuse rating, if the filament of X breaks then the

ABrightness Of Y will reduce

BBrightness Of Y will remain constant

CBrightness Of Y will increase

Dfuse F will blow

View Explanation & Discuss

Question 1767

jamb 1995

A body of mass 40kg is being dragged along the floor by a rope inclined at 60 degrees to the horizontal. The frictional force between the box and the floor is 100N and the tension on the rope is 300N. How much work is done by dragging the box for a distance of 4m

A680J

B400J

C200J

D100J

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Question 1768

jamb 1995

The acceleration of the system show above is

A2ms^-2

B4ms^-2

C6ms^-2

D8ms^-2

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Question 1769

jamb 1995

The value of T in the figure above is

A10.0N

B11.8N

C20.0N

D40.0N

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Question 1770

jamb 1995

In the above fig, PQ and R are vectors, which of the following options, gives a correct relationship between the vectors?

AP = Q + R

BP = Q - R

CP = R - Q

DP + Q + R = O

View Explanation & Discuss

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