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2002 - WAEC Physics Past Questions and Answers - page 1

1

The force between the molecules of a liquid in contact with that of a solid is

A
adhesive
B
cohesive
C
magnetic
D
repulsive
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2

A reservoir is filled with a liquid of density 2000kgm-3. Calculate the depth at which the pressure in the liquid will equal to 9100Nm-2 [g = 10ms-2]

A
0.262m
B
0.455m
C
0.664m
D
0.819m
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3

A solid weight 45N and 15N respectively in air and water. Determine the relative density of the solid

A
0.33
B
0.50
C
1.50
D
3.00
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4

One common characteristics of solids, liquids and gasses is that

A
all the three has fixed volume
B
their molecule have the same size
C
their molecules are always in motion
D
all the three have the same inter molecular forces
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5

A boy travels 8 km eastward to a point B and then 6km northward to another point C. Determine the difference between the magnitude of displacement of the boy and distance travelled by him

A
2.0km
B
4.0km
C
10.0km
D
13.0km
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6

The magnitude of the force required to make an object of mass, m move with speed, v in a circular of radius r is given by the expression

A
\(\frac{mr}{v}\)
B
\(\frac{mr^2}{v}\)
C
\(\frac{mv^2}{r}\)
D
\(\frac{mv}{r^2}\)
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7

A man was moving round a circular path continuously for 4 minutes and covered the following distances in the times stated :
Distance (in metres) 200, 400, 600, 300
Time(in minutes) : 1, 2, 3, 4 respectively. Which of the following statements is correct about the motion of the man?

A
the man was moving without uniform velocity
B
the speed was changing constantly
C
the velocity was uniform
D
it was an instance of motion in which both speed and velocity are the same
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8

A car takes off from rest and covers a distance of 80m on a straight road in 10s. Calculate the magnitude of its acceleration

A
1.25ms-2
B
1.60ms-2
C
4.00ms-2
D
8.00ms-2
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9

An object is released from rest at a height of 25m. Calculate the time it takes to fall to the ground. [g = 10ms-2]

A
25.00s
B
10.00s
C
2.50s
D
2.24s
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10

An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is not correct?

A
The resultant of the parallel force is zero
B
the algebraic sum of the moment of the forces is zero
C
all the parallel forces must be equal in magnitude and in direction
D
the sum of the forces in one direction must be equal to the sum of forces in the opposite direction
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