The distance between two successive crests of a water is 1m. lf a particle on the surface of the water makes two complete vertical oscillations in 1 second, calculate the speed of the wave
A0.5 ms-1
B1.0 ms-1
C2.0ms-1
D3.0ms-1
E4.0ms-1
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Question 1712
waec1996
A string of length 1.0 m vibrates in 10 loops. If the total mass of the string is 1.0 x 10-3 kg and the tension in it is 10N, calculate the frequency of the vibration.
A50Hz
B100Hz
C250Hz
D400Hz
E500Hz
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Question 1713
waec1996
The walls and ceilings of many standard auditoria are covered with perforated pads to
Aincrease the intensity of sound waves
Bincrease the loudness of sound waves
Creduce the effect of reverberations of sound waves
Dincrease the interference effect of sound waves
Edecrease the frequency of sound waves.
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Question 1714
waec1996
Which of the following instruments produces sound by the vibration of air column?
APiano
BGuitar
CFlute
DHand bell
ETalking drum
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Question 1715
waec1996
A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object?
A2.0cm
B3.3cm
C5.0cm
D10.0cm
E15.0cm
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Question 1716
waec1996
The refractive index of a medium relative to air is 1.8. Calculate the critical angle for the medium to the nearest degree.
A18o
B34o
C45o
D68o
E90o.
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Question 1717
waec1996
When a ray of light is incident normally on an air- glass interface, its angle of refraction is
A0o
B42o
C45o
D60o
E90o
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Question 1718
waec1996
A ray of light is incident on a glass block as shown in the diagram above. If the reflected and the retracted rays are perpendicular to each other, what is the refractive index of the glass relative to air.?
A1.60
B1.58
C1.52
D1.50
E1.48
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Question 1719
waec1996
When a ray of light is incident normally on an air- glass interface, its angle of refraction is
A0o
B42o
C45o
D60o
E90o.
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Question 1720
waec1996
The graph above shows the relationship between sin i and sin r for a ray of light in air incident on a liquid surface. If i and r are respectively angles of incidence and refraction, deduce the refractive index of the liquid from the graph
A1.63
B1.50
C1.33
D1.25
E0.08
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Question 1721
waec1996
A boy walks away from a plane mirror at a speed of 3 ms-1 in a direction normal to the surface of the mirror. At what speed is his image approaching him?
A8 9.0ms-1
B6.0ms-1
C4.5ms-1
D1.5ms-1
E0.0ms-1
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Question 1722
waec1996
A ray of light strikes a plane mirror at a glancing angle of 50o. Calculate the angle between the incident and reflected rays
A20o
B40o
C50o
D80o
E100o.
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Question 1723
waec1996
In which of the following media would sound waves travel fastest?
AKerosine
BAlcohol
CWater
Dlron
EAir
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Question 1724
waec1996
The main reason why rice cooks faster in a pressure cooker than in cooking pot is that
Aless heat escapes from the cooker
Bthe vapour pressure in the cooker is constant
Cthe rice is not affected by the draught over the cooker
Dthe vapour pressure in the cooker decreases
Ethe boiling point of water in the cooker is raised.
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Question 1725
waec1996
Water boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of the mountain the
Asaturation vapour pressure of water is higher than at sea-level
Bsun adds more heat to the water
Ctemperature is lower than at sea- level
Drelative humidity of the atmosphere is lower
Epressure of the atmosphere is lower
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Question 1726
waec1996
Cloud formation is the direct result of
Aprecipitation
Bvaporization
Cfusion
Dsublimation
Econdensation
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Question 1727
waec1996
The saturated vapour pressure of a liquid increases as the
Avolume of the liquid increases
Bvolume of the liquid decreases
Ctemperature of the liquid increases
Dtemperature of the liquid decreases
Emass of the liquid decreases
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Question 1728
waec1996
The inside of a vacuum flask is usually coated with silver to reduce heat lost by
Aconvection
Bconduction
Cradiation
Dabsorption
Eevaporation
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Question 1729
waec1996
The heating element in an electric kettle is usually located near the bottom of the kettle because
Awater is a good conductor of heat
Bheat can be more quickly radiated to all parts of the water
Cno heat can be lost to the surroundings
Dthe convectional currents which are set up can carry heat to all parts of the water
Ethe molecules of the heating element can carry heat to all parts of the water.
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Question 1730
waec1996
What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100oC to 80oC? (Specific latent heat of steam = 2.260,000J kg-1) (Specific heat capacity of water =4,200 J kg-1)
