Sound interference is necessary to produce the phenomenon of
Abeats
Bdoppler effect
Cacoustic resonance
Decho
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Question 402
waec2009
Which of the following is not a part of the electro-magnetic spectrum?
Ax-rays
Bmicrowaves
Cinfrared radiation
Dalpha rays
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Question 403
waec2009
Which of the following characteristics of light determines its colour?
Avelocity
Bwavelength
Camplitude
Dintensity
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Question 404
waec2009
A thin lens is placed 50cm from an illustrated object. The image produced has linear magnification of \(\frac{1}{4}\). Calculate the power of the lens in dioptres
A2.5D
B5.0D
C10.0D
D25.0D
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Question 405
waec2009
A concave mirror forms a magnified and errect image only when the object is placed
Aat the centre of curvature
Bat the focus
Cbetween the focus and the pole of the mirror
Dbeyound the radius of curvature
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Question 406
waec2009
The angle of incidence of a ray of light on a plane mirror is 55o. Determine the angle between the reflected ray and the mirror
A35o
B45o
C55o
D110o
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Question 407
waec2009
Light travelling through a small pinhole usually does not make a shadow with a distinct sharp edge because of
Adiffraction
Binteference
Creflection
Drefraction
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Question 408
waec2009
Which of the following waves is not transverse
Alight waves
Bsound waves
Csea waves
Dradio waves
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Question 409
waec2009
A boat is rocked by waves of speed 30ms-1 whose successive crest are 10m apart. Calculate the rate at which the boat recieves the waves
A30s-1
B10s-1
C3s-1
D1s-1
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Question 410
waec2009
The maximum displacement of a vibrating tunning fork is its
Aamplitude
Bfrequency
Cperiod
Dwavelength
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Question 411
waec2009
Which of the following factors affect the rate of evaporation of a liquid? i. Exposed surface area ii Temperature of the surroundings iii. Thermal capacity of the liquid iv. Relative humidity of the surroundings
Aii and iii only
Bii, iii and iv only
Ci, iii and iv only
Di, ii amd iv only
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Question 412
waec2009
Which of the following is used to measure relative humidity?
Ahydrometer
Bbarometer
Chypsometer
Dhygrometer
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Question 413
waec2009
When table salt is added to ice, the melting point of the ice
Ais raised
Bis lowered
Cremains unchanged
Dis first raised, then lowered
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Question 414
waec2009
It takes 4 minutes to boil a quantity of water using an electrical heating coil. How long will it take to boil the same quantity of water using the same coil if the current is doubled? [Neglect any external heat losses]
A8 minutes
B4 minutes
C2 minutes
D1 minute
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Question 415
waec2009
as a bicycle Tyre was being pumped up, it was noticed that contrary to Boyle's law the volume increased as the pressure increased. The best explanation of this is that Boyle's law is only true for
Aideal gases
Ba fixed mass of gas
Ca mixture of gases
Da gas at variable temperature
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Question 416
waec2009
A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC. Calculate the increase in length of the rod if its linear expansivity is 4.0 x 10-3K-1
A0.26m
B0.44m
C0.53m
D0.84m
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Question 417
waec2009
A faulty thermometer registers 102.5oC t 100oC. If the thermometer has no zero hour, what will it register at 55oC?
A54.6oC
B55.0oC
C56.0oC
D56.4oC
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Question 418
waec2009
A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine
A0.50
B0.63
C0.80
D1.60
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Question 419
waec2009
A stone of mass 0.5kg is dropped from a height of 12m. Calculate its maximum kinetic energy. [g = 10ms-1]
