Question 1
The image in a plane mirror of a modern clock looks as shown.
State the correct time
Answer
9.25 am
Question 2
Light from a point source falls on an object. Draw rays to show how the shadow of the object is formed on the screen
Answer
Question 3
Two metallic spheres A, B stand in contact as shown. A positively charged rod is held near sphere A.
i) Show the charge on each sphere when the metallic balls are separated and the rod is removed
ii) Why are the balls supported on insulated stands
Answer
i)
ii) to prevent earthing of the charges
ii) to prevent earthing of the charges
Question 4
The diagram below shows two bulbs connected in parallel to each other and then in series with a battery
a) Why would such bulb be brighter than if they were connected in series
b)A current of 2 A passes through bulb Q for 2 mm 30 seconds. Determine the quantity of charge through Q
Answer
a)Bulbs in parallel have a less force resistance than in series.
Higher/more current flows through them and hence are brighter.
b) Q = it
Q = 2 x 90
Q = 180
Higher/more current flows through them and hence are brighter.
b) Q = it
Q = 2 x 90
Q = 180
Question 5
Current flows through a straight conductor AB. A compass needle is placed above the conductor. Show the direction of deflection of the needle (in diagram 2). a)
Draw the compass in this gap
b) State the rule you have used
Answer
a)
b) Amperes swimming rule
b) Amperes swimming rule