Question Library

Which gas produces a red coloured light in a discharge tube?

an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]

An object is placed in front of two plane mirrors inclined at 60o to each other. Determine the number of the images formed

A transverse wave can be distinguished from a longitudinal wave by

Refraction of lights differs from reflection in that, in refraction i. at least two media are involved ii. there is a change in the direction of the ray iii. the speed of the ray changes. Which of the statements above is/are correct?

Which of the following relations about the focal length fo of the objective and focal length fe of the eye piece of a compound is correct?

The functional difference between a lens and a mirror is that a lens

The diagram above illustrates an electromagnetic wave travelling with speed 3.0 x 108ms-1. Calculate the wave length of the wave

In an ac circuit when the supply voltage frequency is equal to the resonant frequency, the current

Which of the following conditions occur at resonance in a series RLC circuit? i. Impedance equals resistance ii. Current is maximum iii. Reactance is maximum iv. Current and voltage are 90^\circ out of phase

You are provided with an illuminated object, converging lens, screen, metre rule, and other necessary materials. Measure and record the size \(a_o\) of the illuminated object. Place the object O and the screen S on Opposite sides of the converging lens L. Set the distance between the object and the lens U = 30cm. Adjust the screen until a sharp image of the illuminated object is obtained on the screen. Measure and record the size a of the image. Evaluate m = \(\frac{a}{a_{0}}\), and m\(^{-1}\) Repeat the procedure for four other values of U=35cm, 40cm, 45cm and 50cm respectively. Tabulate your readings. Plot a graph with m\(^{-1}\) on the vertical axis and U on the horizontal axis. Determine the slope, s, of the graph and intercept, C, on the vertical axis. Determine the value of U for which m\(^{-1}\)=0. State two precautions taken to obtain accurate results. (b)i. Using your graph, determine the value of m for which U= 37cm. ii. Sketch a diagram to illustrate how a converging lens may be used to produce a real diminished image of an object.

A wave that travels through stretched strings is known as

A transverse wave and a longitudinal wave travelling in the same direction in a medium differ essentially in their

If a sonometer has a fundamental frequency of 450HZ, what is the frequency of the fifth overtone?

If the linear magnification of the objective and eyepiece convex lenses of a compound microscope are 4 and 7 respectively. Calculate the angular magnification of the microscope