If the position of resonance in a resonance tube is 16.50cm from open end of the tube, calculate the distance from the open end to the next position where resonance occurs. (Neglect end-correction)
A24.75cm
B33.00cm
C41.25cm
D49.50cm
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Question 12
waec1999
ln order to obtain a sound note of a high pitch from a wire stretched by a constant tension, the wire must be
Ashort and thick
Bshort and thin
Clong and thick
Dlong and thin
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Question 13
waec1999
The amplitude of a wave is the
Adistance between two successive troughs of the wave
Bseparation of two adjacent particles vibrating in phase
Cmaximum displacement of the wave particle from the equilibrium position
Ddistance travelled by a wave in a complete cycle of its motion
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Question 14
waec1999
Which of the following statements is not correct about long sight?
AA Iong-sighted person can see distant objects clearly
Bight from a nearby object is focused behind the retina.
CThe eyeball is too short
DThe defect is corrected by using a diverging lens.
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Question 15
waec1999
The real image of an object formed by a converging lens of focal length 15cm, is three times the size of the object. Calculate the object distance
A60cm
B30cm
C20cm
D15cm
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Question 16
waec1999
The refractive index of glass for yellow light is greater than that for red light because yellow light
Ahas a greater amplitude than red light
Bis more intense than red light
Ctravels more slowly than red light
Ddeviates less than red light
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Question 17
waec1999
The image of an object is located 6cm behind a convex mirror. If its magnification is 0.6, calculate the focal length of the mirror
A3.75cm
B6.60cm
C10.00cm
D-15.00cm
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Question 18
waec1999
The air column in a resonance tube is set into resonance by a vibrating tuning fork. The resultant waves in the air column will be
Amechanical and transverse
Bprogressive and longitudinal
Cstationary and transverse
Dstationary and longitudinal.
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Question 19
waec1999
A ray of light is incident on 'a plane mirror at an angle of 20o. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is
A20o
B40o
C80o
D120o.
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Question 20
waec1999
Calculate the power rating of an immersion heater used for 10 minutes to increase the temperature of 10kg of water by 15K. (Specific heat capacity of water = 4200 J l
A1,050W
B16,800W
C18,060W
D20,160W
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Question 21
waec1999
Which of the following statements about evaporation is not correct?
AThe rate of evaporation of a liquid varies with temperature
BThe molecules of an evaporating liquid have an average speed
CEvaporation occurs when faster molecules escape from the surface of a liquid
DEvaporation takes place inside a liquid.
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Question 22
waec1999
Calculate the heat energy required to change 0.1kg of ice at 0oC to water boiling at 100oC. (Specific heat capacity of water = 4200 J kg-1K-1) (Specific latent heat of fusion of ice = 336,000 J kg-1)
A75,600J
B336,000J
C340,200J
D378,000J.
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Question 23
waec1999
Which of the following statements is not correct?
AA sea breeze is due to convection in air
BCotton materials are better than woollen ones for use in hot weather
CConvectional currents play an important role in the cooling of the engine of a motor car
DThe vacuum space in a flask helps to reduce heat loss by radiation.
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Question 24
waec1999
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 25
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 26
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 27
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 28
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 29
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 30
waec1999
A pendulum bob executing simple harmonic motion has 2cm and 12Hz as amplitude and frequency respectively. Calculate the period of the motion.
