The temperature of a piece of metal of mass 9 g is raised from 10oC to 110oC when it absorbs 108J of heat energy. Determine the specific heat capacity of the metal in J kg-1K-1
A1.2
B12.0
C120.0
D1200.0
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Question 652
waec1999
The heat capacity of a substance is the energy
Arequired to raise the temperature of a unit mass of the substance by one degree.
Brequired to raise the temperature of the substance by one degree
Cabsorbed by the substance at constant temperature
Dlost by a unit mass of the substance.
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Question 653
waec1999
An iron rod of length 50m and at a temperature of 60oC is heated to 70oC. Calculate its new length. (Linear expansivity of iron = 1.2 x 10-5K-1)
A50.006m
B50.060m
C51.600m
D51.200m
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Question 654
waec1999
Iron at 30oC feels colder to the hand than wood at 28oC because
Atheir linear expansivities are not equal.
Bthe temperature of the iron is higher than that of the wood
Ciron is a better radiator of heat than wood
Diron conducts heat more quickly from the hand than wood
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Question 655
waec1999
The ice point of an ungraduated mercury-in-glass thermometer is X, while its steam point is 90o. This thermometer reads 60o when the true temperature is 40oC Calculate the value of X.
A60o
B48o
C40o
D30o
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Question 656
waec1999
A trolley of mass 4kg moving on a smooth horizontal platform with a speed of 1.0ms-1 collides perfectly with a stationary trolley of the same mass on the same platform. Calculate the total momentum of the two trolleys immediately after the collision.
A0.5Ns
B1.0Ns
C4.0Ns
D8.0Ns
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Question 657
waec1999
A pendulum bob executing simple harmonic motion has 2cm and 12Hz as amplitude and frequency respectively. Calculate the period of the motion.
A2.00s
B0.83s
C0.08s
D0.60s
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Question 658
waec1999
A 15kg mass, suspended from a ceiling, is pulled aside with a horizontal force, F, as shown in the diagram above. Calculate the value of the tension, T. (g = 10ms-2)
A300.0N
B173.2N
C30.0N
D17.3N
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Question 659
waec1999
If the force of attraction between the sun and the 1 planets is removed; the planets will
Afall towards the sun
Bscatter and stop moving
Ccontinue to move at tangent to their original orbits
Dcontinue to move perpendicular to their original orbits. '
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Question 660
waec1999
A stone of mass 0.7kg is projected vertically , upwards with a speed of 5ms-1. Calculate the maximum height reached. (Take g as 10ms-2 and neglect air resistance)
A1.00m
B1.25m
C1.50m
D3.75m
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Question 661
waec1999
The time rate of change of displacement is known as
Aspeed
Bvelocity
Cimpulse
Dacceleration
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Question 662
waec1999
A motorcyclist, passing a road junction, moves due west for 8 s at a uniform speed of 5ms-1. He then moves due north for another 6 s with the same speed. At the end of the 6s his displacement from the road junction is 50m in the direction of
AN53oE
BN37oE
CN53oW
DN37oW
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Question 663
waec1999
A body weighing 100N moves with a speed of 5ms-1 in a horizontal circular path of radius 5m. Calculate the . magnitude of the centripetal force acting on the body. (g = 10ms-2)
A10N
B50N
C75N
D100N
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Question 664
waec1999
Palm oil from a bottle flows out more easily after it as been heated because the
Amolecules are given potential energy during the heating
Bfriction between oil layers is reduced
Coil molecules force each other out
Dadhesion between the oil molecules and those of the bottle is increased
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Question 665
waec1999
A net force of magnitude 0.6N acts on a body of mass 40g, initially at rest. Calculate the magnitude of tire resulting acceleration.
A90ms-2
B60ms-2
C30ms-2
D15ms-2.
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Question 666
waec1999
The force between molecules of the same substance is termed
Aelastic force
Brepulsive force
Ccohesive force
Dadhesive force
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Question 667
waec1998
It is always not possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the
ADe broglie's law
BHeisenberg's uncertainty principle
CCompton effect
DFrank-Hertz experimental law
EWave particle paradox
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Question 668
waec1998
Two radioactive elements X and Y have half-lives of 100 and 50 years respectively. Samples of X and Y initially contain equal number of atoms. What is the ratio of the number of the remaining atoms of X to that of Y after 200 years?
A4:1
B3:1
C1:1
D1:2
E1:4
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Question 669
waec1998
The frictional effect between the layers of a moving fluid is called
Acapillarity
Bturbulence
Cdiffusion
Dosmosis
Eviscosity
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Question 670
waec1998
A radioactive nuclide of proton number X emits a \(\beta\)-particle to form a new nuclide to proton number Y. The correct equation relating X and Y is
