Calculate the inductance L, of the coil in the circuit diagram shown above
A3.8H
B0.6H
C0.4H
D0.2H
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Question 1362
waec2002
A freely-suspended magnet swinging in a horizontal plane comes to rest with its axis pointing approximately
Anorth-south
Bsouth-west
Cnorth-east
Dsouth-east
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Question 1363
waec2002
A transformer has 400 turns and 200 turns in the primary and secondary windings respectively. If the current in the primary and secondary windings are 3A and 5A respectively. calculate the efficiency of the transformer?
A85.0%
B83.3%
C37.5%
D30.0%
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Question 1364
waec2002
Which of the following actions will not lead to an increase in the induced e.m.f. in a coil of wire rotating between the poles of a magnet? Increasing the
Astrength of the magnet
Bnumber of turns in the coil
Cspeed of location in the coil
Dgap between the poles of the magnet
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Question 1365
waec2002
The lead-acid accumulator consists of a
Alead as the positive electrode
Blead ocide as the negative electrode
Chydrochloric acid as the electrolyte
Dtetraoxosulphate(VI) acid as the electrolyte
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Question 1366
waec2002
Local actions is normally prevented in a simple electric cell by
Aintroducing an oxidizing agent in the acid
Bnot drawing current continously for long period
Camalgamating the surface of the zinc plate
Dusing a porous pot to isolate the zinc plate from the acid
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Question 1367
waec2002
The magnitude of the gravitational attraction between the earth and a particle is 40N. If the mass of the particle is 4kg. Calculate the magnitude of the gravitational field intensity of the earth on the particle
A10.0N kg-1
B12.6N kg-1
C25.0N kg-1
D160.0N kg-1
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Question 1368
waec2002
Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. [G = 6.70 x 10-11Nm-2kg-2]
A6.70 x 10-11N
B6.70 x 10-10N
C6.03 x 10-11N
D6.03 x 10-7N
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Question 1369
waec2002
Three capacitors each of capacitance 18\(\mu F\) are connected in series. Calculate the effective capacitance of the capacitors
A54.00\(\mu F\)
B18.00\(\mu F\)
C6.00\(\mu F\)
D0.17\(\mu F\)
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Question 1370
waec2002
Which of the following items can be used to compare the relative magnitudes of electric charges on two bodies?
Aebonite rod
Bgold leaf electroscope
Cproof plane
Dthe electrophorus
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Question 1371
waec2002
Which of the following actions will not cause an increase in the frequency of a vibrating string?
Aincreasing the tension of the string
Bdecrease the mass per unit lengthof the string
Cdecrease the length of the string
Dincreasing the cross sectional area of the string
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Question 1372
waec2002
Which of the following instruments is not a wind instrument?
Aclarinet
Bsaxophone
Ctrumpet
Dxylophone
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Question 1373
waec2002
When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon can be called
Abeats
Bdiffraction
Covertones
Dresonance
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Question 1374
waec2002
A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560ms-1]
A312.0m
B156.0m
C78.0m
D31.2m
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Question 1375
waec2002
In a compound microscope, the image formed by the objective lens is at a distance of 3.0cm from the eye lens. If the final image is at 25.0cm from the eye lens, calculate the focal length of the eye lens
A0.3cm
B2.7cm
C3.4cm
D8.3cm
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Question 1376
waec2002
A converging lens of focal length 15cm forms a virtual image at a point 10cm from the lens. Calculate the distance of the object from the lens
A10.00cm
B6.00cm
C5.00cm
D1.50cm
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Question 1377
waec2002
The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium
A68o
B56o
C34o
D18o
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Question 1378
waec2002
The size of the hole of a pin hole camera is increased. The resultant image formed becomes
Asharper
Breduced in size
Cenlarged
Dblurred
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Question 1379
waec2002
In the wave equation y = Eo, sin(299t - \(\pi\)), Eo represents the
Aamplitude
Bfrequency
Cperiod
Dwavelength
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Question 1380
waec2002
A radio wave has a wavelength of 150m. If the velocity of radio waves is free spaces is 3 x 10\(^8\) ms\(^{-1}\), calculate the frequency of the radio wave
