1990 - JAMB Physics Past Questions and Answers - page 3

A boy looks at the image of an object in a plane mirror. He observes two images, a main bright one and the other faint. The observed images result from

What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?

For a short sighted person, light rays from a point on a very distant object is focused

When light is incident on an object which is magenta in colour, which of the following colour would be absorbed?

In a resonance tube experiment, the effective length of the air column for the first resonance is 20cm when set into vibration by a tuning fork of frequency 480Hz. Neglecting and effect, the velocity of sound in air is

An organic pipe closed at one end is 80cm long. Determine the frequency of the fundamental note assuming that the speed of sound in air is 340ms^-1

A sonometer wire of length 100cm under a tension of 10N, has a frequency of 250Hz. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350Hz. The new tension is

One of the properties of the earth's magnetic field is that the

Which of the following statements are true of an insulated charged body carrying positive charge? i. it contains excess positive charges. ii. it creates an electric field. iii. it possesses potential energy. iv. it carries electric current.

Which of the following is a vector?