1990
Which listed phenomenon demonstrates wave behaviour rather than the classical movement or regular arrangement of particles of matter?
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1990 WAEC SSCE Physics Past Questions
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1990
A plane inclined at 30o to the horizontal has an efficiency of 50%. Calculate the force parallel to the plane required to push a load of 120N uniformly upn the plane
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1990
Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?
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1990
The diagram above shows a portion of a standard metric micrometer screw gauge. Use 0.01 mm per thimble division. What reading is shown by the drawn marks?
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1990
An oscillating pendulum has a speed of \(2\,\mathrm{m\,s^{-1}}\) at the equilibrium (lowest) position O. Point P is a turning point, where the pendulum stops for an instant before swinging back. Ignore air resistance and…
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1990
A particle of mass 2.5 x 10-6kg revolving around the earth has a radial acceleration of 4 X 107 ms-2. What is the centripetal force of the particles?
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1990
An object R leaves a platform XY with a horizontal velocity of 7 m s−1 and lands at U. If it takes the same object 0.3 s to fall freely from Y to P, calculate the distance PU. (Take g = 10 m s−2.)
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1990
Two forces each of 4 N act on the opposite sides of a rectangular plate as shown in the diagram above. Calculate the magnitude of the couple acting on the plate.
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1990
A girl whose mass is 55kg stands on a spring - weighing machine inside a lift. When the lift starts to ascend, its acceleration is 2ms1. What will be the reading on the machine? (Take g = ms-2)
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1990
Dry hydrogen is trapped by pellet of mercury in a uniform capillary tube closed at one end. If the length of the column of hydrogen at 27°C is 1.0m, at what temperature will the length be 1.20m?
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1990
A cube of an isotropic metal has linear expansivity \(\alpha\) and initial volume \(V\). It is warmed through a temperature rise \(t\). Using the small-expansion approximation, what is the increase in volume?
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1990
The absolute zero temperature is defined as the temperature at which
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1990
An object weighs 10.0 N in air and 7.0 N in water. What is its weight when immersed in a liquid of relative density 1.5?
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1990
The body P shown in the diagram above is in equilibrium. If the mass Q of the body is 10 kg, calculate the tension T in the string. (Take g = 10 m/s2)
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1990
Which of the following is not a suitable method for reducing loss of heat from a piece of hot iron?
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1990
Heat transfer by convection in a liquid is due to the
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1990
How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?
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1990
Solids P and Q have equal masses and start at the same temperature, above room temperature. P is put into X and Q into Y. These identical containers each hold the same volume of water. Both containers and their water sta…
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1990
The diagram above represents part of a wave motion in air. If the wave travels with a speed of 300ms-1, calculate the frequency of the wave.
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1990
A tuning fork sounds louder when its stem is pressed against a table top than when held in air because
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