1.
[1] Why
should solar cookers are to be
covered with glass plate ?
2.
[1] Define
electric circuit. Distinguish between open and
closed circuit.
3.
[2] (a)
What material is used in making the filament of an electric bulb
?
(b) Name
the characteristics which
make it suitable for this.
4.
[2] Two electric bulbs A and
B are marked 220V, 40W and 220V,
60W respectively. Which one of the two
has greater resistance ?
5.
[2] Differentiate overloading and short
circuiting.
6.
[2] Write any
two advantages of using Biogas.
7.
[3] A piece of wire of resistance 20 Ohm is
drawn out so that its length is
increased to twice its original
length. Calculate the resistance of the
wire in the new situation
8.
[3] (a)
What is the total resistance of n resistors each of resistance
‘R’ connected in :
(i) Series (ii) Parallel
(b) Calculate the resultant resistance of 3 resistors 3 , 4
and 12 Ohm connected in parallel.
9.
[3] (a)
What is a fuel ?
(b) Write
any two characteristics of a good fuel.
10.
[3]Draw
a diagram to show how a magnetic needle deflects when it is placed above or below
a straight conductor carrying current depending on the direction of the
current in the conductor.
11.
[5] (a)
What is a Solenoid ?
(b) Draw
the field lines of the magnetic field through and around a current carrying solenoid.
(c) Compare the field
pattern with magnetic field around a bar
magnet
OR
(a) Which
rule helps to find
the force on a current carrying conductor in a magnetic field ?
(b) State the
rule.
(c) Name
the three factors
on which the
force on the
current carrying conductor depend.
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