Solve this: (d) why a single fixed pulley is used no gain mechanical
advantage,
(c) A metal wire of 60 Q. It •scut inmhreeequal lengths. Find
the equivalent resistance when two pans are connected in parallel and the third
pan is in series with them.
Question 3
(a) Establish a relation between an electron volt and the Sl unit of the physical
quantity which it measures.
(b) Why is the earth pin ofa three-pin plug made longer and thicker?
(c) Write the energy conversions m the followmg:
(i) microphone
(iii lighted candle
(d) Mention two ways to increase the strength of an electro-magnet.
G) What characteristics of sound would change if there is a change in its:
(i) amplitude
(ii) wave form.
'oestion 4
Which cools faster, I and or Water? Give a reason for your answer.
State any two properties of u radiation.
Scissorsfbr cnt'ing cloth haw blades much longer than handles Why?
Two lamps. onc rated 40 W. 220 V and the other having reststance
Q(ohtn) 60 W, 220 V arc connected in parallel combination across to
supply. Calculate the current drawn from the supply line.
State two precautions that should be taken while handling
'bstances,
