Which of the following simple machines is a second class lever?
Awheel barrow
Bcrowbar
Cclaw hammer
Dseesae
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Question 512
waec2005
A body of mass 25kg, moving at 3ms-1 on a rough horizontal floor, is at rest after sliding through a distance of 2.50m on the floor. Calculate the coefficient of sliding friction. [g = 10.0ms\(^{-2}\)]
A0.09
B0.18
C0.36
D0.54
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Question 513
waec2005
The friction which exists between two layers of liquid in relative motion is called
Acapillarity
Bsurface tension
Cviscosity
Dcohension
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Question 514
waec2005
Which of the following statements about a spring balance and/or a chemical balance is not correct?
Athe chemical balance operates on the principle of moments
Bthe sprin balance operates on Hooke's law
Ceither may be used to measure the weight of a substance
Dthe reading of a spring balance changes over the surface of the earth, while that of the chemical balance remaind constant
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Question 515
waec2005
Each of the following physical quantities is classified as a vector or a scalar quantity. Which of the classifications is correct?
Aelectric potential (Vector)
Bmomentum (scalar)
Cgravitational field intensity (scalar)
Dmagnetic flux density (vector)
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Question 516
waec2005
Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules?
ATranslational motion
Brotational motion
Cbrownian motion
Doscillatory motion
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Question 517
waec2004
In an experiment using a converging lens to produce real images on a screen, the linear magnification m, is plotted against the image distance v, as illustrated in the diagram below. The distance OP represents the
Afocal legth of the lens
Bthickness of the lens
Cradius of curvature of the lens
Ddiameter of the lens
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Question 518
waec2004
Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?
A\(^{30}_{28} X\)
B\(^{28}_{30} X\)
C\(^{58}_{30} X\)
D\(^{58}_{28} X\)
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Question 519
waec2004
A radioactive substance has a half-life of 3 days. If a mass of 1.55g of this substance is left after decaying for 15 days, determine the original value of the mass
A49.6g
B37.2g
C24.8g
D12.4g
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Question 520
waec2004
Which of the following statements about X-rays is not correct? They
Aare electromagnetic waves
Bcan be used to study crystal lattice
Ccan destroy living cells
Dare produced from the nucleus of an atom
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Question 521
waec2004
In which of the following devices is the principle of photoelectric effect not applicable?
Aclose-circuit television camera
Bburglar alarm
Csolar cells
Dperiscope
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Question 522
waec2004
An atom is normally electrically neutral because the
Anumber of electrons is equal to the number of protons
Bnumber of electrons is equal to the number of neutrons
Cnumber of protons is equal to the number of neutrons
Delectrons of the atom are buried deeply in the nucleus
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Question 523
waec2004
The main function of the mouth piece of a telephone is that it converts sound energy to
Amechanical energy
Belectrical energy
Cchemical energy
Dthermal energy
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Question 524
waec2004
Which of the following statements is not correct?
Aa magnetic field is a region in which a magnetic force will be detected
Ba magnetic line of force is a path along which a magnetic fields are scalar quantities it were free
Cmagnetic fields are scalar quantities
Dneutral point are obtained where the earth's magnetic force is exactly equal and opposite to that due to a magnet
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Question 525
waec2004
A charge of 1.6 x 10-10C is placed in a uniform electric field of intensity 2.0 x 105 NC-1. calculate the magnitude of the electric force exerted on the change
A3.2 x 105N
B1.8 x 105N
C3.2 x 10-5N
D1.8 x 10-5N
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Question 526
waec2004
Given that the gravitational constant is G. Newton's universal law of gravitation states that the force of attraction between two masses M1 and M2 separation by a distance r is
A\(Gr^2 M_1M_2\)
B\(Gr M_1M_2\)
C\(\frac{GM_1 M_2}{r^2}\)
D\(\frac{GM_1 M_2}{r}\)
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Question 527
waec2004
Calculate the energy stored in a 20\(\mu F\) capacitor. If the p.d between the plates is 40V
A3.2 x 10-2J
B1.6 x 10-2J
C8.0 x 10-4J
D4.0 x 10-4J
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Question 528
waec2004
The quantity of electric charge stored in a capacitor is measured in
Afarad
Bampere
Ccoulomb
Dvolt
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Question 529
waec2004
Find the cost of running a 60W lamp for 24 hours. If 1kW hr cost 5 naira
A14.4 naira
B12.5 naira
C7.2 naira
D2.0 naira
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Question 530
waec2004
A car fuse marked 3A operates optimally on a 12V battery, calculate the resistance of the fuse
