Melting ice cools an orange drink far better than the same mass of ice-cold water because
Amelting ice is lower temperature than ice-cold water
Bwater has a higher specific heat than ice
Cice floats and cools the air above the drink
Dice absorbs latent heat during melting
Eice makes better thermal contact than water
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Question 22
waec1991
a tap supplies water at 26oC while another supplies water at 82oC. If a man wishes to bathe with water at 40oC the ratio of hot mass of hot water to that of cold water required is
A1:3
B3:1
C3:7
D7:3
E15:8
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Question 23
waec1991
A team trap is a component of the apparatus used in determining the specific latent heat of vaporisation of steam. In the steady 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
Edetermine the quantity of steam used
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Question 24
waec1991
The boiling point of a liquid depends on the following except the
Anature of the liquid
Bexternal pressure
Cvolume of the liquid
Dimpurities present in the liquid
Edegree of it's molecular cohesive force
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Question 25
waec1991
A fixed mass of gas of volume 600cm3 at a temperature of 27oC is cooled at constant pressure to a temperature of 0oC. What is the change in volume?
A54cm2
B273cm2
C300cm2
D546cm2
E600cm2
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Question 26
waec1991
The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different arrangements. Using the data in the diagrams. Calculate the pressure of the atmosphere
A76cm of Hg
B75cm of Hg
C74cm of Hg
D60cm of Hg
E45cm of Hg
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Question 27
waec1991
A water fall is 420m high. Calculate the difference in temperature of the water between the top and bottom of the water fall. Neglect heat loses(g = 10.0m-2 specific heat capacity of water = 4.20 x 10\(^3\) JKg-1 K-1)
A0.1oC
B1.0oC
C42oC
D100oC
E4.20oC
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Question 28
waec1991
A wire, 20m long is heated from a temperature of 5oC to 55oC. If the change in length is 0.020m, calculate the linear expansivity of the wire
A1.0 x 10-3k-1
B2.0 x 10-4k-1
C2.0 x 10-5k-1
D1.0 x 10-5k-1
E2.0 x 10-6k-1
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Question 29
waec1991
The diagram above represents six maximum and minimum thermometer. If the temperature of the surrounding falls, which of the following correctly states how the thermometer would respond to the change in temperature?
AS1, would move upward but S2 would not move
BS1 would not move but S2 would move upwards
Cboth S1 and S2 would move upwards
DS1 would move downwards and S2 would move downwardw
ES1 would move downwards and S2 wouldnmove downwards
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Question 30
waec1991
A boatman facing north wants to cross a flowing river to a point directly opposite its position at the other bank. If the river is flowing eastwards, in what direction should he row his boat?
Awest
Beast
Cnorth-west
Dnorth-east
Esouth-west
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Question 31
waec1991
The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W
A300N
B200N
C140N
D120N
E20N
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Question 32
waec1991
The product PV where P is pressure and V is volume has the same unit as
Apower
Bwork
Cacceleration
Dimpulse
Eforce
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Question 33
waec1991
power is defined as the
Acapacity to exert a force
Bproduct of force and time
Cproduct of force and distance
Dability to do work
Eenergy expended per unit time
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Question 34
waec1991
An orange fruit drops to the ground from the top of a tree 45m tall. How long does it takes to reach the ground? (g = 10ms-2)
A3.0s
B4.5s
C6.0s
D7.5s
E9.0s
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Question 35
waec1991
the diagram above shows the position of a simple pendulum set in motion. At which of the positions does the pendulum have maximum kinetic energy?
A5
B4
C3
D2
E1
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Question 36
waec1991
A body moving with uniform acceleration has two points(5, 15) and (20, 60) on the velocity-times graph of its motion. Calculate the acceleration of the body
A0.25ms-2
B3.00ms-2
C4.00ms-2
D9.00ms-2
E16.00ms-2
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Question 37
waec1991
A ball is projected horizontally from the top of a hill with a velocity of 20m-1. If it reaches the ground 4 seconds later, what is the height of the hill? (g = 10ms-2)
A20m
B40m
C80m
D160m
E200m
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Question 38
waec1991
A body moves with a constant speed but has an acceleration. this process if it
