Physics Past Questions and Answers

When viewed straight down, a fish in a pond is

A Father below than it apperas to be
B Mearer than it appears to be
C Found at exactly the same point it is seen
D Seen beside its image

Question 1237:

A converging lens and a screen are placed 20 cm and 80 cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3cm high. Calculate the height of the image formed

A 1 cm
B 9cm
C 12cm
D 15cm

Question 1238:

Which of the following defects of vision is as a result of the eye ball being too long?

A Long sight
B Astigmatism
C Short sight
D Loss of accommodation

Question 1239:

a sound wave is produced fron a source ans an echo is heard t seconds afterwards. If d is the distance of the reflecting surface from the source, v the speed, p the wavelength and T the period of the wave, then

A D = \(\frac{2t}{\lambda}\)
B D = \(\frac{\lambda t}{2T}\)
C D = \(\frac{2T}{\lambda t}\)
D D = \(\frac{\lambda T}{2t}\)

Question 1240:

A negatively charged rod is held close to an uncharged metal ball on an insulating stand. The ball will

A Be negatively chargeed
B Be positively charged
C Have an excess negatively charges on the side nearest the rod
D Have an excess positively charges on the side nearest the rod