Which device does NOT make use of the magnetic effects of an electric current?
Ahot-wire ammeter
Bmoving-coil ammeter
Cmoving-coil loudspeaker
Dmoving-iron ammeter
Etelephone earpiece
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Question 22
neco2002
The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?
A4V
B8V
C16V
D200V
E4000V
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Question 23
neco2002
Which is a fundamental unit?
Aampere
Bjoule
CNewton
Dohm
Ewatt
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Question 24
neco2002
An object 8cm in front of a plane mirror moves at a speed of 6cm s-1 away from the mirror. What will be the distance separating the object and the image after 2s?
A8cm
B12cm
C20cm
D28cm
E40cm
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Question 25
neco2002
An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?
A10k
B50k
CN1.00
DN5.00
EN10.00
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Question 26
neco2002
Which colour is deviated least when white light passes through a triangular prism?
Agreen
Bindigo
Cred
Dviolet
Eyellow
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Question 27
neco2002
The ability of the eye to focus on objects at various distances is known as
Aaccommodation
Bastigmatism
Ceye ring
Dmyopia
Epresbyopia
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Question 28
neco2002
In an operating X-ray tube, a high p.d is applied between the cathode and the anode for the purpose of
Aaccelerating the electrons to a very high energy
Bconcentrating electrons on the target
Cheating the anode
Dheating the cathode
Eproducing a stream of electrons
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Question 29
waec2002
A nuclide X is produced by bombarding a nitrogen(N) nucleus with an alpha(\alpha\) particle with the release of heavy hydrogen(D) nucleus as shown by the following nuclear equation, \(\alpha + ^{14}_{7}N \to ^p_qX + ^2_1D\). Determine the values of p and q in the equation
A12 and 6
B14 and 7
C16 and 8
D19 and 8
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Question 30
waec2002
Which of the following materials is used to control the rate of neutron production in a nuclear reactor?
Aboron rods
Bconcrete shield
Cgraphite rods
Duranium rods
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Question 31
waec2002
Which of the following is usually used to cause fission in an atomic reactor?
AAlpha particles
Bbeta particles
Celectrons
DNeutrons
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Question 32
waec2002
If a radioactive atom emits a beta particle, Its mass number
Aincreases by one
Bremains the same
Cdecreases by one
Dincreases by two
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Question 33
waec2002
In a model of the hydrogen atom, the energy levels Wn are given by the formula Wn = -\(\frac{R}{n^2}\), where n is an integer and R is a constant. Determine the energy released in the transition from n = 3 to n = 2.
A\(\frac{R}{5}\)
B-\(\frac{R}{4}\)
C\(\frac{5R}{36}\)
D\(\frac{-5R}{36}\)
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Question 34
waec2002
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 35
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 36
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 37
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 38
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 39
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 40
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
