2018 - JAMB Physics Past Questions and Answers - page 4

31

The process whereby a liquid turns spontaneously into vapour is called

A
regelation
B
evaporation
C
boiling
D
sublimation
correct option: b
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32

The differences observed in solids, liquids and gases may be accounted for by

A
their relative masses
B
their melting points
C
the spacing and forces acting between the molecules
D
the different molecules in each of them
correct option: c
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33

Convex mirrors are used as driving mirrors because images formed are

A
erect, Virtual and diminished
B
erect, real and diminished
C
erect, virtual and magnified
D
inverted, virtual and diminished
correct option: a
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34

Musical instruments playing the same note can be distinguished from one another owing to the difference in their

A
quality
B
pitch
C
intensity
D
loudness
correct option: b
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35

In the diagram shown, If the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be

A
north and south
B
south and south
C
north and north
D
south and north
correct option: c
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36

In homes, electrical appliances and lamps are connected in parallel because

A
less current will be used
B
less voltage will be used
C
parallel connection does not heat up the wires
D
series connection uses high voltage
correct option: d
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37

An object moves in a circular path of radius 0.5m with a speed of 1ms\(^{-1}\). What is its angular velocity?

A
8rads\(^{-1}\)
B
4rads\(^{-1}\)
C
1rads\(^{-1}\)
D
2rads\(^{-1}\)
correct option: d
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38

What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm?

A
100N
B
90N
C
80N
D
120N
correct option: a
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39

Calculate the effective capacitance of the circuit in the diagram given

A
4μf
B
3μf
C
2μf
D
1μf
correct option: d
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40
What flows to the earth by connecting the conductor to the earth?
A
Electrons
B
Ion
C
Neutron
D
Proton
correct option: a
Ion: an atom with a net electric charge due to loss or gain of one or more electrons Neutron: a subatomic particle of about the same mass as a proton without electric charge. Proton: a subatomic particle with a positive charge
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