Question 1
A vertical object O is placed at the principal focus F of a diverging lens as shown in Fig. I
Complete the diagram by drawing appropriate rays to show the image formed
Answer
Question 2
Two electric heaters A and B rated 1000 W and 2500 W respectively are connected in parallel across a 240 mains supply. Calculate the ratio RA: RB of their resistances >
Answer
Question 3
Fig. 2 represents crests of water waves approaching a wide opening.
Crests of the same water waves are now approaching a narrow opening. Sketch the crests after passing through the opening
Answer
Question 4
Why is it advisable to store magnetized magnetic tapes in an iron box?
Answer
The iron box protects the magnetized tapes from being demagnetised . The magnetic fields of the nearby magnet/ earths magnetic field are concentrated round the iron box to form a loop hence do not enter the box
Question 5
Alpha particles are said to be more ionizing than beta particles. Give two reasons for this observation.
Answer
-Have a large charge
-Have a large mass
-Have a large mass