1989
Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of water = 2260Jg-1K-1][specific latent heat of vaporisation of water = 2260Jg-1]
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1989 WAEC SSCE Physics Past Questions
1989
A boy pulls a nail from the wall with a string tied to the nail. The string is inclined at an angle of 60o to the wall. If the tension in the string is 4N, what is the effective force used in pulling the nail?
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1989
Which of the following is not a consequence of a force field?
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1989
Which of the following is NOT a vector quantity?
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1989
The motion of the prongs of the sounding tuning fork is
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1989
A stone tied to a string is made to revolve in a horizontal circle of radius 4m with an angular speed of 2 rad per sec. With what tangential velocity will the stone move off the circle if the string is cut?
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1989
A piece of cork floating on water is acted upon by the forces of...
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1989
A block of material of volume 20cm-3 and density 2.5gcm-3 is suspended from a spring balance with half the volume immersed in water. What is the reading of the spring balance? (Density of water = 1.0gcm-3).
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1989
Which of the following is used to determine the relative density of the acid in a car battery?
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1989
Which of the followiempeng statements is/are not correct?
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1989
A thermometer has its stem marked in millimeter instead of degree Celsius. The lower fixed point is 30mm and the upper is 180mm. Calculate the temperature in degree celsius when the thermometer reads 45mm.
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1989
An engine raises 1000kg of water through a height of 60m in 20s. What is the power of the engine? (Take g = 10ms-2>).
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1989
All the heat generated by a current of 2A passing through a resistor of 6Ω for 2.5s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?
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1989
A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?
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1989
Which of the following substance is not a good conductor of electricity?
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1989
Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain the
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1989
The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium?
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1989
Which of the following surfaces will radiate heat energy best?
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1989
The image in a pine-hole camera is always
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1989
A ray of light is incidence on a plane mirror at an angle of 35o. What is the angle by the reflected ray with the surface of the mirror?
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