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2004 - JAMB Physics Past Questions and Answers - page 3

21

The pitch of a sound note depends on

A
timbre
B
frequency
C
harmonics
D
quality
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22

If u is the object distance and v the image distance, which of the following expressions gives the linear magnification produced by a convex lens of focal length f?

A
u/f - f
B
u/v + f
C
v/f + 1
D
v/f - 1
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23
The refractive index of the medium M in the diagram above is
A
1/√3
B
2√3
C
√3
D
2/√3
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24

When left in a freezer, a bottle full of water cracks on freezing into ice because of the

A
increase in the volume of water
B
contraction of the bottle
C
expansion of the bottle
D
decrease in the volume of water
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25
The phase difference between waves P and q in the diagram above is
A
2π
B
π
C
π/4
D
π/2
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26

The change in volume when 450kg of ice is completely melted is

[density of ice = 900 kgm-3, density of water = 100 kgm-3]

A
0.50m3
B
0.45m3
C
0.05m3
D
4.50m3
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27

Tea pots are often silver-coated to prevent heat loss by

A
conduction only
B
convention only
C
convection and conduction
D
radiation only
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28

I. Wavelength

II. Medium of propagation

III. Wave velocity

IV. Frequency

V. Energy

Which of the above are used for characterizing waves?

A
I, II and V
B
I and IV
C
I, III and IV
D
III, IV and V
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29

A 50W electric heater is used to heat a metal block of mass 5kg. If in 10 minutes a temperature rise of 12oC is achieved, the specific heat capacity of the metal is

A
400 J kg-1K-1
B
500 J kg-1K-1
C
390 J kg-1K-1
D
130 J kg-1K-1
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30

Metal rods of length 20m each are laid end to end to form a bridge at 25oC. What gap will be provided between consecutive rails for the bridge to withstand 75oC?

[Linear expansivity of the material = 2.0 x 10-5K-1

A
0.20m
B
0.22m
C
0.25m
D
0.02m
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