A thermometer has its stem marked in millimeter instead of degree Celsius. The lower fixed point is 30mm and the upper is 180mm. Calculate the temperature in degree celsius when the thermometer reads 45mm.
A67.5oC
B30.0oC
C25.0oC
D15.0oC
E10.0oC
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Question 922
waec1989
An engine raises 1000kg of water through a height of 60m in 20s. What is the power of the engine? (Take g = 10ms-2>).
A120,000 W
B30,000 W
C333 W
D300 W
E30 W
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Question 923
waec1989
Which of the following is a derived unit?
AMetre
BCoulomb
CKilogram
DSecond
EAmpere
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Question 924
waec1989
The motion of the prongs of the sounding tuning fork is
Arandom
Btranslational
Crotational
Dvibratory
Evibratory and rotational
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Question 925
waec1989
A stone tied to a string is made to revolve in a horizontal circle of radius 4m with an angular speed of 2 rad per sec. With what tangential velocity will the stone move off the circle if the string is cut?
A16.0 ms-1
B8.0 ms-1
C6.0 ms-1
D2.0 ms-1
E0.5 ms-1
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Question 926
waec1989
A piece of cork floating on water is acted upon by the forces of...
AWeight and viscosity
Bweight and upthrust
Cupthrust and viscosity
Dweight only
Eupthrust only
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Question 927
waec1989
A block of material of volume 20cm-3 and density 2.5gcm-3 is suspended from a spring balance with half the volume immersed in water. What is the reading of the spring balance? (Density of water = 1.0gcm-3).
A8g
B25g
C30g
D40g
E50g
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Question 928
waec1989
Which of the following is used to determine the relative density of the acid in a car battery?
AHypsometer
BHygrometer
CManometer
DHydrometer
ESpectrometer
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Question 929
waec1989
A boy pulls a nail from the wall with a string tied to the nail. The string is inclined at an angle of 60o to the wall. If the tension in the string is 4N, what is the effective force used in pulling the nail?
A2√3 N
B4 N
C4√3 N
D8 N
E2 N
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Question 930
waec1989
Which of the following is not a consequence of a force field?
Awieght
Bsurface tension
Cgravitational pull
Dmagnetic force
Eelectric force
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Question 931
waec1989
Which of the following is NOT a vector quantity?
Amomentum
Bforce
Cvelocity
Dtemperature
Edisplacement
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Question 932
waec1988
During the same interval, it is observed that a train travels the same distance as does a lorry. The two vehicles therefore have the same
Auniform accelation
Binstateneous velocity
Cinitial velocity
Daverage speed
Eaverage velocity
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Question 933
waec1988
Two radioactive elements A and B have half-lives of 100 and 50 years respectively. Samples of A and B initially contain equal amounts/number of atoms. What is the ratio of the number of the remaining atoms of A to that of B after 200 years?
A4 : 1
B2 : 1
C1 : 1
D1 : 2
E1 : 4
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Question 934
waec1988
Which of the following is not an electromagnetic radiation?
AX-ray
BRadio waves
CSunlight
DSound waves
EInfra-red radiation
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Question 935
waec1988
An electron of charge 1.6 x 1019C is accelerated in vacuum from rest at zero volt towards a plate of 40KV. Calculate the kinetic energy of the electron.
A4 x 10 25J
B4 x 1021 J
C6.4 x 1020 J
D6.4 x 10-15 J
E2.5 x 1020 J
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Question 936
waec1988
Which of the following is/are not affected by a magnetic field?
I. Neutrons
II. Cathode rays
III. Alpha particles
AI only
BII only
CIII only
DI & III only
EI, II & III
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Question 937
waec1988
Which of the following is/are not correct about isotopes of an element? The have
Athe same neutron number
Bthe same proton number
Csame number of electrons
Dsame chemical properties
Edifferent physical poperties.
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Question 938
waec1988
The unit of inductance is the
Afarad
Bhenry
Chertz
Dampere
Ecoulomb
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Question 939
waec1988
Which of the following explains the concave meniscus of water in a glass tube?
AThe adhesion between water and glas is greater than the cohesion between water molecules
BThe cohesion between water molecule is greater than the adhesion between glass and water
CThe molecules of water in the glass are moving faster than the molecules in the other parts
DThe molecules of water at the water-air boundary are often attracted to the center of the tube
EThe weight of the water pulls the central part of the surface down
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Question 940
waec1988
When sugar at the bottom of a glass of water gradually dissolves, the water level does not change applicably. Which of the following statements best describe this?
AWater is suitable solvent for sugar
BThe sugar and the water have become single solution
CThe volume of water molecule does not change when sugar dissolves.
DSugar molecule is small than that of water
EWater molecules are separated by large spaces between them
