Under which of the following conditions is workdone
AA man supports a heavy food above his head with his hands
BA boy climbs onto a table
CA man pushes unto a table
DA woman holds a pot of water
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Question 562
jamb2017
Under what conditions are cathode rays produced in a discharge tube?
AHigh pressure and low voltage
BHigh pressure and high voltage
CLow pressure and low voltage
DLow pressure and high volatge
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Question 563
jamb2017
Calculate the upthrust on an object of volume 50cm3 which is immersed in liquid of density \(10^{3}\) kgm-3 [g = 10ms-2]
A0.8N
B2.5N
C0.5N
D1.0N
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Question 564
jamb2017
Why do soldiers march disorderly while crossing a bridge?
ATo prevent resonance on the bridge
BTo set the bridge into resonance
CTo make the b ridge collapse
DTo spread their weight evenly on the bridge
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Question 565
jamb2017
Calculate the electric field intensity between two plates of potential difference 6.5V when separated by a distance of 35cm.
A18.57NC\(^{-1}\)
B53.06N C\(^{-1}\)
C2.28NC\(^{-1}\)
D0.80NC\(^{-1}\)
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Question 566
jamb2017
Which of the following is not an electromagnetic radiation?
Ax - ray
BRadio waves
Csunlight
Dsound waves
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Question 567
jamb2017
Which is the incorrect formula for a body accelerating uniformly?
Aa = v2 − \(\frac{u^2}{2}\)
Bv2 = u2 + 2as
Cs = ut + \(\frac{1}{2}\) at2
Dv2 − u2= 2as
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Question 568
waec2016
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 569
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 570
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 571
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 572
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 573
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 574
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 575
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 576
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 577
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 578
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 579
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 580
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.
