Which of the following statements about moving particle is correct?
Aif the resultant force acting on the particle is zero, then it is in dynamic equillibrium
BIf the resultant force acting on the acting on the particle is greater than zero, then it is moving with a uniform velocity
Cthe rate of change of its momentum with time tales place in a direction opposite to that of its motion
Dthe particle falling freely covers equal distances in equal time interval
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Question 392
waec2010
Which of the following statements about static friction is correct? It
Ais independent of the nature of the surface in contact
Bdepends on the area of surface in contact
Cdepends on the relative motion between the surface in contact
Ddepends on the weight of the moving body
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Question 393
waec2010
The types of motion which a cylindrical drum rolling down an inclined plane undergoes are
Acircular and translational
Brotational and translational
Crotational and circular
Drectilinear and circular
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Question 394
waec2010
What is the density of a fuel of relative density 0.72? [Density of water = 1000kg m-3]
A72 kgm-3
B720 kgm-3
C7200 kgm-3
D72000 kgm-3
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Question 395
waec2010
Which of the following instruments is best for measuring the diameter of a thin constantan wire?
Acallipers
Bmetre rule
Cmicometer screw guage
Dvernier callipers
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Question 396
waec2010
Which of the following properties of a long steel bar would alter if the bar were melted, recast into a cube and allowed to cool to its original temperature?
Asensity
Bvolume
Cspecific heat capacity
Delectrical resistance
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Question 397
waec2009
An electron of mass 9.1 x 10-31 kg moves with a speed of 107ms-1. Calculate the wavelength of the associates wave[h = 6.6 x 10-34Js]
A9.0 x 10-24m
B4.55 x 10-17m
C7.25 x 10-11m
D6.20 x 10-8m
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Question 398
waec2009
The main difference between x-rays and \(\gamma-rays\) lies in their
Aionizing ability
Babsorption rate
Cmode of production
Dmode of propagation
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Question 399
waec2009
Two isotopes of uranium are designed as \(^{238}U\) and \(^{235}U\). The numbers 238 and 235 represent their
Aatomic numbers
Bnucleon numbers
Cproton numbers
Dneutron numbers
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Question 400
waec2009
An ammeter connected to an a.c circuit records 5.5. The peak current in the circuit is
A7.8A
B7.1A
C3.8A
D3.5A
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Question 401
waec2009
An inductor of inductance 1.0H is connected in series with a capacitor of capacitance 2.0\(\mu F\) in an a.c. circuit. to resonate
A112.5Hz
B225.0Hz
C323.5Hz
D707.1Hz
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Question 402
waec2009
If the direction of the curent in a straight wire is reversed, the magnetic field
Aremains the same
Bbecomes parallel to the wire
Cceases to exist
Dis oppositely directed
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Question 403
waec2009
A battery of e.m.f. 12.0V and internal resistance0.5\(\Omega\) is connected to 1.5\(\Omega\) and 4.0\(\Omega\) series resistor. Calculate the terminal voltage of the battery.
A13.0V
B11.0V
C3.0V
D1.0V
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Question 404
waec2009
A wire of resistivity 4.40 x 10-5\(\Omega\) cm has a cross sectional area of 7.50 x 10-4 cm2. Calculate the length of the wire that will be required to make a 4.0\(\Omega\) resistor
A82.50 cm
B68.18cm
C15.90cm
D11.95cm
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Question 405
waec2009
A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 3.0\(\Omega\). A voltmeter connected across the cell registers 0.9V. Calculate the internal resistance of the cell
A2.0\(\Omega\).
B3.0\(\Omega\).
C5.0\(\Omega\).
D6.0\(\Omega\).
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Question 406
waec2009
A resistor of resistance R is connected to a battery of negligible internal resistance. If a siilar resistor is connected in series with it the
Aeffective resistance of the circuit is halved
Btotal power dissipated is doubled
Ctotal current in the circuit is halved
Dterminal voltage is halved
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Question 407
waec2009
An isolated metal sphere of radius R, carrying an electric charge Q, is situated in the medium of relative permitivity, Er. A test charge is placed at a point p, distance r from the surface of the sphere. Let Eo represent the permitivity of free space. The magnitude of the electric field intensity at P is given by the expression
A\(\frac{Q}{4 \pi E_o E_r r^2}\)
B\(\frac{Q}{4 \pi E_o E_r(R + r)^2}\)
C\(\frac{Q}{4 \pi E_o E_r(R - r)^2}\)
D\(\frac{Q}{4 \pi E_o E_rR^2}\)
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Question 408
waec2009
An isolated metal sphere of radius R, carrying an electric charge Q, is situated in the medium of relative permitivity, Er. A test charge is placed at a point p, distance r from the surface of the sphere. Let Eo represent the permitivity of free space. The electric potential at p is given by the expression
A\(\frac{Q}{4 \pi E_o E_r}\)
B\(\frac{Q}{4 \pi E_o E_r (R +r)}\)
C\(\frac{Q}{4 \pi E_o E_r(R - r)}\)
D\(\frac{Q}{4 \pi E_o E_rR}\)
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Question 409
waec2009
When a conductor mounted on an insulating stand is charged and left for sometime, the conductor eventually loses all its charges. This is because the
Aelectric charges evaporate from the surface of the conductor
Bcharges are connected to earth
Ccharges on the conductor are neutralized by opposite charges from the surrounding air
Dcharges ionize the surrounding air
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Question 410
waec2009
A satellite in circular motion around the earth does not have
