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2012 - WAEC Physics Past Questions and Answers - page 1

1

The derived unit of pressure can be expressed as

A
kgms-2
B
kg m-1s-2
C
kg m-2s-2
D
kg m-1s2
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2

The diagram above illustrates trapped air in a syringe placed in water that is gradually heated. It is observed that the piston rises as the temperature of the water rises. Which of the following statements explains this observation?

A
frequency of collision of trapped air molecules with walls of the syringe is more
B
molecules of trapped air expands more
C
speed of the trapped air molecules decreases
D
number of molecules of trapped air increases
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3

Which of the following devices is used to determine the relative density of an acid?

A
manometer
B
hydrometer
C
hypsometer
D
hygrometer
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4

A block of wood of density 0.6 gcm-3, weighing 3.06N in air, floats freely in a liquid of density 0.9 gcm-3. Calculate volume of the portion immersed (g = 10ms-2)

A
510cm3
B
340cm3
C
254cm3
D
170cm3
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5

A metal ball of weight W falls through a column of glycerine of viscosity V. If the ball experiences an upthrust U and terminal velocity is attained is attained, then

A
W > U + V
B
W = U + V
C
W = U - V
D
W < U + V
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6

The movement of fluid up or down a narrow tube is

A
osmosis
B
brownian motion
C
capillarity
D
diffusion
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7

Which of the following substances is the most volatile at room temperature?

A
water
B
diesel
C
petrol
D
kerosine
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8

a bird flies at 10ms-1 for 3s, 15ms-1 for 3s and 20 ms-1 for 4s. Calculate the bird's average speed

A
4.5 ms-1
B
15.0 ms-1
C
15.5 ms-1
D
51.7 ms-1
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9

The time of flight for a projectile motion is given by the expression

A
\(\frac{U sin \theta}{g}\)
B
\(\frac{U sin \theta}{2g}\)
C
\(\frac{2U sin \theta}{g}\)
D
\(\frac{U sin 2\theta}{g}\)
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10

An object is dropped from the top of a tower. If it takes 4s for it to reach the ground, calculate the height of the tower.(g = 10 ms-2, ignore air resistance)

A
20m
B
40m
C
80m
D
160m
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