Which of the following actions will not increase the sensitivity of a moving coil galvanometer?
Ausing a strong temporary magnet
Bincreasing the area and number of turns of the coil
Cusing a week hair spring
Dusing a light pointer
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Question 422
waec2008
A voltmeter is a device that
Adraws high current
Bhas a very low resistance
Chas a very high resistance
Dis able to measure both voltage and current
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Question 423
waec2008
Three capacitors each of capacitance 1.5\(\mu F\) are connected in series. The total capacitance in the circuit is
A2.0 \(\mu F\)
B1.5 \(\mu F\)
C0.6 \(\mu F\)
D0.5 \(\mu F\)
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Question 424
waec2008
A wire 1.0m long and with cross-sectional area 2.0 x 10-7 m2 has a resistance of 0.1\(\Omega\). Calculate the electrical conductivity of the wire
A2.0 x 107\(\Omega^{-1} m^{-1}\)
B5.0 x 107\(\Omega^{-1} m^{-1}\)
C2.0 x 108\(\Omega^{-1} m^{-1}\)
D5.0 x 108\(\Omega^{-1} m^{-1}\)
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Question 425
waec2008
Which of the following is a unit of the time rate of flow of electric charges?
Acoulomb
Bampere
Cvolt
Dwatt
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Question 426
waec2008
If the charge on an object is measured as 4.0 x 10-18C, how many excess electrons does the object possess, given that the charge of an electron is 1.6 x 10-18C
A18
B19
C25
D37
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Question 427
waec2008
Two bodies each carrying a charge of 2.00 x 10-10C are 5cm apart. Calculate the magnitude of the force between the charges.[\(\frac{1}{4\pi \mathit{E}_o} = 9.00 \times 10^9 Nm^2C{-2}\)]
A1.44 x 10-7N
B7.20 x 10-9N
C7.20 x 10-11N
D1.44 x 1011N
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Question 428
waec2008
A negatively charged rod is held close to an uncharged metal ball on an insulating stand. The ball will
Abe negatively chargeed
Bbe positively charged
Chave an excess negatively charges on the side nearest the rod
Dhave an excess positively charges on the side nearest the rod
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Question 429
waec2008
a sound wave is produced fron a source ans an echo is heard t seconds afterwards. If d is the distance of the reflecting surface from the source, v the speed, p the wavelength and T the period of the wave, then
Ad = \(\frac{2t}{\lambda}\)
Bd = \(\frac{\lambda t}{2T}\)
Cd = \(\frac{2T}{\lambda t}\)
Dd = \(\frac{\lambda T}{2t}\)
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Question 430
waec2008
Which of the following defects of vision is as a result of the eye ball being too long?
Along sight
Bastigmatism
Cshort sight
Dloss of accommodation
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Question 431
waec2008
A converging lens and a screen are placed 20 cm and 80 cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3cm high. Calculate the height of the image formed
A1 cm
B9cm
C12cm
D15cm
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Question 432
waec2008
When viewed straight down, a fish in a pond is
Afather below than it appears to be
Bnearer than it appears to be
Cfound at exactly the same point it is seen
Dseen beside its image
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Question 433
waec2008
The image of an object formed by a convex mirror is
Areal, errect and enlarged
Breal, inverted and enlarged
Cvirtual, erect and diminished
Dvirtual, erect and enlarge
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Question 434
waec2008
The distance between a concave mirror and an object placed in front of it is 1.0m. If the raduis of curvature of the mirror is 4.0m, the image formed will be
A2.00m behind the mirror
B2.00m in front of the mirror
C1.25m in front of the mirror
D1.25m behind the mirror
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Question 435
waec2008
In the day time, it is possible to see under shady areas such as under a tree because light has undergone
Ainternal reflection
Brefraction
Cdiffraction
Ddiffuse reflection
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Question 436
waec2008
Light is considered as a transverse wave because it travels
Athrough material without causing disturbance of the medium
Bthrough space with constant speed
Cin a direction parallel to the plane containing the electric and magnetic fields
Din a direction perpendicular to the plane containing the electric and magnetic fields
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Question 437
waec2008
It takes a shorter time for a liquid to boil at the top of a mountain than at the base because at the top, the
Atemperature is higher
Bpressure is lower
Chumidity is higher
Dtemperature is constant
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Question 438
waec2008
The working principle of a pressure cooker is based on the
Aincrease in the volume of steam inside it
Bcomplete trapping of heat inside it
Cincrease in the pressure of the pot
Ddecrease in the pressure of the pot
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Question 439
waec2008
Water of mass 1.5kg is heated from from 30oC to 80oC using an electric kettle which is rated 5A, 230V. Calculate the time taken to reach the final destination [specific heat capacity of water 4200Jkg-1K-1]
A4.57 minutes
B5.02 minutes
C7.30 minutes
D10.04 minutes
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Question 440
waec2008
The cubic expansivity of a certain gas at constant pressure is \(\frac{1}{273} k^{-1}\). If a given mass of the gas is held at constant pressure and its volume at 0oC is 273m3, determine the volume of the gas at 273oC.
