A car fuse is marked 15A and operates normally on a 12V battery. Calculate the resistance of the fuse wire
A180Ω
B27Ω
C3Ω
D1.3Ω
E0.8Ω
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Question 782
waec1994
A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes are made to press lightly against the commutator and when these are connected in a circuit with a battery and a rheostat, the coil rotates. This is a description of
Aa moving coil ammeter
Ba D.C generator
Ca D.C electric motor
DAn induction coil
EAn A.C generator
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Question 783
waec1994
A battery of e.m.f 10V an internal resistance 2Ω is connected to a resistance of 6Ω. Calculate the p.d
A8.75V
B7.50V
C5V
D2.50V
E1.25V
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Question 784
waec1994
Which of the following scientists postulated that moving particles exhibit wave properties?
ANiels Bohr
BErnest Rutherford
CWerner Heisenberg
DLouis de Broglie
EErwin Schroedinger
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Question 785
waec1994
Which of the following is not a part of an A.C generator?
ACarbon brushes
BSlip rings
CCommutator
DField magnet
EArmature
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Question 786
waec1994
The electrical energy supplied by a Leclanche cell is obtained from the
ANuclear energy
BMagnetic energy
CSolar energy
DChemical energy
EMechanical energy
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Question 787
waec1994
Which of the following has the shortest wavelength?
AInfrared rays
BGamma rays
CUltra violet rays
DRadio waves
EVisible light
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Question 788
waec1994
Which of the following are transverse waves? I. Ripples on water II. Sound waves in air III. Light waves from the sun?
AII only
BI only
CII and III only
DI and III only
EI, II, and III.
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Question 789
waec1994
The inability of the eye to focus near objects is known as
ALong sight
BAstigmatism
CPresbyopia
DGlaucoma
EShort sight
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Question 790
waec1994
A simple magnifying glass is used to view an object. At what distance from the lens must the object be placed so that an image 5 times the size of the object is produced 20cm from the lens?
A2cm
B4cm
C15cm
D25cm
E100cm
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Question 791
waec1994
The image of an object placed at the center of the curvature of a concave mirror is
AInverted and magnified
Bat the principal focus
Creal and diminshed
DErect and virtual
Eat the center of the curvature
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Question 792
waec1994
A hygrometer is an instrument used to measure
ADew point
BTemperature
CRelative density
DRelative humidity
EVapour pressure
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Question 793
waec1994
A steam trap is a component of apparatus used in determining the specific latent heat of vaporization of steam. In the steady state, the steam trap
Astores the steam for future use
Bprevents the steam from escaping
Censures that only dry steam gets into the calorimeter
Dallows condensed steam to go into the calorimeter
Edetermines the quantity of steam used
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Question 794
waec1994
A tap supplies water at 30°C while another supplies at 86°C. If a man wishes to bath with water at 44°C, calculate the ratio of mass of hot water to that of cold water required
A1:3
B3:1
C3:7
D7:3
E15:8
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Question 795
waec1994
The instrument used in the measurement of atmospheric pressure is?
AHydrometer
BRatemeter
CBarometer
DPhotometer
EManometer
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Question 796
waec1994
When two objects P and Q are supplied with the same quantity of heat,the temperature change in P is observed to be twice that in Q. If the masses of P and Q are the same,calculate the ratio of the specific heat capacities of P and Q
A1:1
B1:3
C1:4
D1:2
E4:1
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Question 797
waec1994
A gas occupies a certain volume at 27°C. At what temperature will its volume be three times the original volume assuming that its pressure remains constant?
A81°C
B162°C
C354°C
D627°C
E900°C
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Question 798
waec1994
The ice and steam points on a mercury in glass thermometer are found to be 90mm apart. What temperature is recorded in degree Celsius when the length of the mercury thread is 33.6mm above the ice point mark?
A33.6°C
B35.0°C
C37.3°C
D52.7°C
E62.7°C
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Question 799
waec1994
In which of the following simple machines is the effort applied between the load and the fulcrum?
