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 12
waec2009
Which of the following waves is not transverse
Alight waves
Bsound waves
Csea waves
Dradio waves
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Question 13
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 14
waec2009
The maximum displacement of a vibrating tunning fork is its
Aamplitude
Bfrequency
Cperiod
Dwavelength
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Question 15
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 16
waec2009
Which of the following is used to measure relative humidity?
Ahydrometer
Bbarometer
Chypsometer
Dhygrometer
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Question 17
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 18
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 19
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 20
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 21
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 22
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 23
waec2009
A stone of mass 0.5kg is dropped from a height of 12m. Calculate its maximum kinetic energy. [g = 10ms-1]
A3.0J
B6.0J
C30.0j
D60.0J
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Question 24
waec2009
Electric energy is measured in
Aampere
Bcoulomb
Ckilowatt-hour
Dkilowatt
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Question 25
waec2009
A body of mass 5kg movimg with a velocity of 30ms-1 due east is suddenly hit by another body and changes its velocity to 50ms-1 in the same direction. Calculate the magnitude of the impulse received.
A100Ns
B150Ns
C250Ns
D400Ns
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Question 26
waec2009
The period of a simple pendulum of length 80.0cm was found to have doubled when the length of the pendulum was increased by X. Calculate X.
A26.7cm
B40.0cm
C160.0cm
D240.0cm
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Question 27
waec2009
Two forces 6N and 8N, act eastwards and northwards respectively on a body. Calculate the magnitude of their equilibrant
A2N
B7N
C10N
D14N
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Question 28
waec2009
The following properties of a solid are measured on earth i. weight ii. specific heat capacity iii. density. Which of the properties will hav a different value if measured in space?
Ai only
Bii only
Ciii only
Dii and iii only
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Question 29
waec2009
A moving body accelerates when it?
Achanges its direction at constant speed
Bmauntains a constant linear speed
Ccovers equal distances in equal times in a straight line
Dis acted upon by balanced forces
Enone of the above
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Question 30
waec2009
A body moving in a circle at constant speed has i. a velocity tangent to the circle ii. a constant kinetic energy iii. an acceleration directed towards the circumference of the circle. Which of the statements above are correct?
