1998 WAEC SSCE Physics Past Questions

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1998

plane as 63cm of HG while a ground observer records a reading of 75cm of Hg with his barometer. assuming that the density of air is constant, calculate the height of the plane above the ground. (Take the relative densiti…

1998

which of the following pairs of physical quantities comprises vectors?

1998

As the end Q of the plank is raised, the component of W, normal to plank, will

1998

A rectangular block of wood floats in water with two-thirds of its volume immersed. When placed in another liquid, it floats with half of its volume immersed. Calculate the relative density of the liquid

1998

The term torque means

1998

A piece of stone attached to one end of string is whirled round in a horizontal circle. When the string is suddenly cut, the stone will

1998

The earth is not a perfect sphere because its equatorial axis is longer than the polar axis. where on the earth's surface would an object have its greatest weight?

1998

An object is protected with a velocity of 100m-1 at an angle of 60o to the vertical. Calculate the time taken by the object to reach the highest point (Take g as 10ms-2)

1998

I the box is pulled from P to Q, which of the following expresses the velocity ratio of the inclined plane?

1998

If \(\theta\) is equal to \(\alpha\) at the time the box is just about to slide down the plank, the coefficient of static friction between the plank and box is

1998

The average kinetic energy of the molecules of a perfect gas is directly proportional to the

1998

A piece of brass of mass 170kg has its temperature raised from 0oC to 30oC. Calculate its increase in volume, given the density of brass at 0oC as 8.5 x 103kgm3 and its cubic expansivity as 5.7 x 10-1k1

1998

An object is heated from 30oC to 57oC. The increases in its temperature on the kelvin scale is

1998

Dry oxygen is trapped by a pellet of mercury in a uniform capillary tube which is sealed at one end. The length of the column of oxygen at 27oC is 50cm. if the pressure of the oxygen is constant, at what temperature will…

1998

The inside of a vacuum flak is usually coated with silver to reduce heat loss by

1998

Air at temperature 527oC and pressure 30 atmospheres is admitted into the cylinder of an engine. Calculate the pressure of the gas when it has expanded to 5 times its volume and cooled to 127oC as it leaves the engine

1998

If the cubic expansivity of brass between 27oC and 100oC is 5.7 x 10-5K-1, What is its linear expansivity?

1998

An eclipse of the sun by the moon occurs when the sun, the moon and the earth are in a straight line and the

1998

If an ebonite rod is rubbed with fur

1998

A 90-W immersion heater is used to supply energy for five minutes. The energy supplied is used to completely melt 180g of a solid at is melting point. Neglecting energy losses to the surroundings, calculate the specific…

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