1.
Define Ohm’s
Law.
2.
What is green
house effect ?
3.
A
wire is cut into three equal
parts and then
connected in parallel. How will
its :
(a) resistance (b) resistivity get effected
?
4.
Calculate
the resistance of a conductor when the
current flowing through it is 0.2
A and the potential difference is 0.8 V
?
5.
How does
the strength of the Magnetic field at the
centre of a circular coil of a wire depend on
(a) radius of the coil (b) number of turns of wire
in the coil
6.
What are exothermic and endothermic reaction. Explain
with the help of one example each.
7.
What are the disadvantage of using fossil fuels ?
8.
How many
resistors of 8W
are connected in parallel to carry 10 A current on 220V line ?
9.
State
Fleming’s Right hand rule.
Give one application of this rule.
What is SI unit of induced
current ?
10.
Explain the following :
(a) Why is Tungsten used for the filament in electric bulbs
?
(b) Why
are the conductors of electric
heating devices, made of an Alloy ?
(c) How
does the resistance of a
wire vary with
its cross sectional area.
11.
Draw a labelled diagram of a biogas plant.
12.
(a) Draw
a shcematic diagram of the common
domestic ciruit.
(b) Write
difference between overloading and
short circuiting.
OR
Answer the
following questions :
(i) What
is the direction of magnetic field lines outside a bar-magnet ?
(ii) What
is SI unit of magnetic field ?
(iii) What
does crowding of magnetic field
lines indicate ?
(iv) What
is the frequency of A.C. in India
?
(v) Name
two organs in the human body where magnetic field is quite significant.
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