Let \(\Delta\)x be the uncertainty in the measurements of position and \(\Delta\)p the uncertainty in measurement of momentum. The uncertainty principle relation is given as
A\(\Delta\)x . \(\Delta\)p = h
B\(\Delta\)x . \(\Delta\)p \(\leq\) = h
C\(\Delta\)x . \(\Delta\)p \(\geq\) = h
D\(\Delta\)x . \(\Delta\)p > h
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Question 2
waec2016
In a p-type semiconductor, the?
Anumber of holes are equal to the number of electrons
Belectrical resistivity increases
Celectrons are the majority charge carriers
Dholes are the majority charge carriers
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Question 3
waec2016
The phenomenon by which two light atomic nuclear combine to form a heavy nuclide with the release of energy is known as
Aradioactivity
Bnuclear fusion
Cnuclear fission
Dchain reaction
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Question 4
waec2016
How many beta particle(s) are emitted in the radioactive decay of \(^{198}_{79}Au \leftarrow ^{198}_{80}Hg\)?
A1
B2
C3
D5
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Question 5
waec2016
What determines the polarity at the ends of an electromagnet? The
Amagnitude of the current passing through the wire
Bmaterial of the core of the magnet
Cmaterial of the coil
Ddirection of current in the wire
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Question 6
waec2016
Which of the following statements is not correct about steel and soft iron?
Asteel is more magnetized than soft iron
Bpermanent magnets are usually made of steel
Csoft iron is more readily magnetized than steel
Dsoft iron more readily loses its magnetism than steel
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Question 7
waec2016
A 10\(\mu\)C charge moves with a velocity of 1.0 x 105 ms-1 at right angle to a uniform magnetic field of flux density 5.0 x 10-4T. Calculate the force on the charge
A5.0 x 10-5N
B5.0 x 10-4N
C5.0 x 105N
D5.0 x 106N
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Question 8
waec2016
In storing magnets, keepers are used to
Areduced self-demagnetization
Bcancel the effect of the earth's magnetic field
Cprotect the magnet from stray electric field
Dincrease the strangth of the magnets
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Question 9
waec2016
Two magnets are used to magnetize a soft iron bar PQ as illustrated in the diagram given. The correct polarity at P and Q respectively
AS and N
BN and N
CS and S
DN and S
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Question 10
waec2016
Which of the following factors does not affect the e.m.f of a primary cell? Its
Asize
Binternal resistance
Coperating temperature
Dduration of usage
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Question 11
waec2016
Two different materials, rubbed against each other acquired opposite charges when separated. This is an example of charging by
Ainduction
Bfriction
Cconduction
Dconvection
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Question 12
waec2016
Two different materials, rubbed against each other acquired opposite charges when separated. This is an example of charging by
Ainduction
Bfriction
Cconduction
Dconvection
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Question 13
waec2016
The p.d across a parallel-plate capacitor is 103V. If the distance between the two plates is 10cm. Calculate the magnitude of the electric field strength between the plates.
A1.0 x 104Vm-1
B1.0 x 105Vm-1
C1.5 x 105Vm-1
D2.0 x 105Vm-1
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Question 14
waec2016
A man and his friend have masses 70kg and 60kg respectively. If they are seated 1.0m apart, calculate the gravitational force of attraction between them. (G = 6.67 x 10-11 Nm2 kg-2)
A1.59 x 10-14 N
B2.80 x 10-7 N
C1.30 x 10-2 N
D6.30 x 1013 N
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Question 15
waec2016
The electricity meters in houses measure energy unit consumed in
Akilowatt-hour
Bvolt
Campere
Dcoulomb
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Question 16
waec2016
An aluminium cable of diameter 4 x 10-3m and resistivity 3.0 x 10-8\(\omega\)m has a resistance of 21\(\Omega\). Calculate the length of the cable. (\(\pi = 3.14\))
A8.0 x 102m
B8.8 x 103m
C8.0 x 104m
D8.8 x 104m
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Question 17
waec2016
An astronomical telescope has objectives and eye-piece lenses of focal length 3.5m and 5cm respectively. Determine the magnifying power of the telescope when in normal adjustment
A70.0
B17.5
C7.0
D0.7
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Question 18
waec2016
The pair of musical instruments that works on the vibration of air in pipes is
Apiano and the organ
Bguitar and the flute
Ctrumpet and the violin
Dflute and the trumpet
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Question 19
waec2016
The diagram given illustrates the waveform of a note produced by vibrations in an air column of length L. If the speed of sound in air is V, derive an expression for the frequency of the notes
