1990 WAEC SSCE Physics Past Questions

1990

Which of the following concept is not an evidence of the particle nature of matter?

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

1990

Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?

1990

The diagram above represents a portion of a micrometer screw 20 gauge. What is its reading?

1990

An oscillating pendulum has a velocity of 2ms-1 at the equilibrium position O and velocity at same point P. Using the diagram above, calculate the height of P above O. (Take g = 10ms2)

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?

1990

An object R leaves a platform XY with a horizontal velocity of 7m-1 and lands at Q. lf it takes the same object 0.3s to fall freely from Y to P, calculate the distance PQ.(Take g = 1Oms2)

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 g the couple acting on the plate.

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)

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?

1990

A cube made of a metal of linear expansivity is warmed through a temperature of t. lf the initial volume of the cube is V what is the increase in volume of the cube?

1990

The absolute zero temperature is defined as the temperature at which

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?

1990

The body P shown in the diagram above is in equilibrium. If the mass Q of the body is 10kg, calculate the tension T in the string. (Take g = 10ms2)

1990

Which of the following is not a suitable method for reducing loss of heat from a piece of hot iron?

1990

Heat transfer by convection in a liquid is due to the

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?

1990

Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise h…

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.

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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