1990 WAEC SSCE Physics Past Questions

1990

A bat emits a sound wave at a speed of 1650.0ms-1 and receives the echoes 0.15s later. Calculate the distance of the bat from the reflector

1990

When the direction of vibration of the particles of a medium is perpendicular to the direction of travel of a wave the wave transmitted is known as

1990

A parallel beam of light is to be obtained from the headlamp ofa car. At which of the following positions should the source of light be placed from the pole of its spherical minor?

1990

Where will the image of the object OB shown in the diagram above be located after reflection from the mirror?

1990

A concave mirror of radius of curvature 20cm has a pin placed at 15cm from its pole. What will be the magnification of the image formed?

1990

A stone is dropped into the middle of a pool of water. Which of the following statements is/are correct? I, Spherical waves are set up in the water. II. The water moves outwards to the sides of the pool. III. Energy is t…

1990

A simple microscope forms an image twice the size of the object. If the focal length of the lens of the microscope is 20m, how far is the object from the lens?

1990

The eye defect illustrated by the diagram above is

1990

The diagram above shows an incident ray A, inclined at angle of 50o to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?

1990

A work of 30 joules is done is transferring 5 millicoulombs of charge from a point B to a point A in an electric Held. The potential difference between B and A is

1990

What is the electric potential energy between two protons each of charge q and at a distance of r apart? (Permittivity of free space = εo)

1990

Calculate the current in the 3Ω resistor shown in the diagram above.

1990

Given that the gravitational constant is 7 X 10-11 Nm2kg-2, what is the force of attraction between 106kg mass of lead hanging one metre away from a 103kg mass of iron?

1990

Birds can perch safely on overhead electric power cables without being electrocuted because

1990

Calculate the resistance of the filament of a lamp rates 240 V, 40 W

1990

If the frequency of the ac. circuit illustrated above is 500/π Hz what would be the reactance in the circuit?Inductance (L) = 0.9H, Capacitance (C) = \(2 \times 10^{-6}\)

1990

A charge of 1.0 x 10-5 Coulombs experience force of 40N at a certain point in space. What is the electric field intensity?

1990

What is the value of R when G shows no deflection in the circuit illustrated above?

1990

Which of the following particles conduct electricity through salty water?

1990

Which of the following reduce(s) the effect of the back e.m.f. generated in the primary coil of an induction coil? The capacitor in the circuit II. The make and break contact in the circuit III. The ratio of turns in the…

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