If the length and diameter of conductor is
double, the
resistance is
a) Remain same b) Double
c) Half d) Four time
The reciprocal of
resistivity is called
a)
Resistance
b)
Conduction
c)
Conductivity
d)
None
One coulomb per
second is equal to
a)
Joule
b)
Volt
c)
Ampere
d)
Walt
In the metallic conductor
the current is due to flow of charge
a)
Positive
b)
Negative
c)
Proton
d)
None
Conventional
current flow from
a)
Positive
to negative
b)
Negative
to positive
c)
Negative
to negative
d)
None
The main source
for the current are
a)
Two
b)
Three
c)
Four
d)
Five
The drift velocity
of electron at 0oC is
a)
zero
b)
Maximum
c)
1
cm/sec
d)
10
cm/sec
In the thermocouple
the heat energy is converted
into
a)
Mechanical
energy
b)
Electric
energy
c)
Magnetic
energy
d)
None
An electric
heater 220V, 440W has a resistance
a)
2
Ω
b)
110
Ω
c)
0.5
Ω
d)
20
Ω
The heating
effect of current utilized in
a)
Iron
b)
Tube
light
c)
Fan
d)
Motor
Mathematical form
of ohm’s law is
a)
I
= VR
b)
I
= V/R
c)
I
= R/V
d)
R
= IV
Ohm’s law is
valid for only current flowing in
a)
Conductors
b)
Transistors
c)
Diodes
d)
Electric
Areas
Through an
electrolyte electric current is passed due to drift of
a.
Free
electrons
b.
Positive
and negative ions
c.
Free
electrons and holes
d.
Protons
The e.m.f. of two
cells can be compared by
a.
AVO
meter
b.
Voltmeter
c.
Potentiometer
d.
Galvanometer
The post office
box is based on the principle of
a.
Galvanometer
b.
Wheat-stone
bridge
c.
Voltmeter
d.
None
At null point the
current through the galvanometer
is
a)
Zero
b)
Maximum
c)
Minimum
d)
None
A current of 10A
flows in a conductors of 10 Ω
resistance for 1 mint the heat produce
will be
a)
102
J
b)
6
x 102 J
c)
6
x 103 J
d)
6
x 104 J
The unit of
conductivity is
a.
Ω.
M
b.
(η.m)-1
c.
Ω.m-1
d.
None
When the bulb is
turned on, ohm’s law is
applicable
a)
Yes
b)
No
c)
May
or may not
d)
None
In series circuit
the net resistance is
a.
Increase
b.
Decrease
c.
Remain
constant
d.
None
Joule law can be
expressed as
a)
I2
Rt
b)
IR2t
c)
IRt2
d)
V2/R
The graph b/w V
and I in case of ohm law is
a)
Parabolic
b)
Curve
c)
Slope
d)
Straight
line
Resistance of
supper conductor is
a)
Finite
b)
Infinite
c)
Zero
d)
Changes
with material
The e.m.f. of a
cell or battery is the voltage b/w its
terminals, when
a.
It
is closed circuit
b.
It
is open circuit
c.
Its
internal resistance is zero
d.
None
The S.I unit of
e.m.f. is same as
a.
Work
b.
Energy
c.
Power
d.
Voltage
The main type of
resistors are
a.
Two
b.
Three
c.
Four
d.
Five
In the carbon
resistor their value can be find by
their
a.
Wires
b.
Terminals
c.
Color
d.
Spots
The third band is
written in the form of power of
a.
2
b.
6
c.
8
d.
10
Tolerance color
means
a.
Greater
b.
Less
c.
Greater-less
d.
None
If the first color
red and 2nd band is green and
third band is orange, then value of
resistance is
a.
20000
b.
24000
c.
25000
d.
None
If the tolerance
color is gold then it value is
a.
±
2%
b.
±
4%
c.
±
5%
d.
±
6%
A variable
resistors is called
a.
Resistance
b.
Rheostat
c.
Amplifier
d.
None
A heat sensitive
resistor is called
a.
Amplifier
b.
Diode
c.
Thermistor
d.
Conductor
The temperature
co-efficient of thermistor is
a.
Positive
b.
Negative
c.
Zero
d.
None
Thermistor can be
used for the accurate
measurement of
a.
Voltage
b.
Resistance
c.
Temperature
d.
Heat
A circuit which
has only one voltage source is
called
a.
Network
b.
Simple
circuit
c.
Complex
circuit
d.
None
The circuit who
has more than one voltage source
is called
a.
Network
b.
Simple
circuit
c.
Complex
circuit
d.
None
The algebraic sum
of all the current at junction is
zero, is Kirchoff’s
a.
1st
law
b.
2nd
law
c.
3rd
law
d.
4th
law
The algebraic sum
of voltages changes around a
closed circuit or loop is zero, is Kirchoff’s
a.
1st
law
b.
2nd
law
c.
3rd
law
d.
4th
law
If the resistance
of a certain length wire, diameter
5mm is 10Ω if the diameter is charge to
10mm,
then new resistance is
a.
40
b.
5
c.
20
d.
2.5
The unit for the
consumption of electrical energy
commonly used is
a.
Joule
b.
Watt
sec
c.
K.
watt. hr
d.
Watt.
hr
Heat generated by
40 watt bulb is one hour is
a.
24000
J
b.
48000
J
c.
144000
J
d.
14400
J
The principle of
potentiometer
a.
P.d
length
b.
P.d
resistance
c.
P.d.
area
d.
None
A fuse is placed
in series with circuit to protect
against
a.
High
power
b.
High
voltage
c.
High
current
d.
Over
heating
If the resistor
is traversed apposite to the direction
of current, then potential is
a.
Positive
b.
Negative
c.
Zero
d.
None
When electricity
passes through the liquid then
process is called
a.
Electro
late
b.
Electrolysis
c.
Electro-conductor
d.
None
Which one gives
pure nature of the material
a.
Resistively
b.
Conductivity
c.
Temperature
co-efficient
d.
None
Kirchoff’s 1st
law is also called law of conservation of
a.
Charge
b.
Mass
c.
Energy
d.
None
The resistivity of a material is
. If the area of cross-section of material is doubled
and length is halved then the resistivity of material is:
a)
b)
4
c) 2
d)
/ 4
Four bulbs of 10W, 20W, 30W and 40W are
connected in parallel, the bulb that will shine more is
a) 10W b) 20W
c) 30W d) 40W
A source of 200V provides a current of
10.0 Amperes to a house. The power delivered by the source is
a) 20 watt b) 40 watt
c) 2000 watt d) 200 watt
When the battery is connected at its
ends, an electric field is set up at
a) Its ends b) Every point
c) Middle d) All of them
The value of resistance depends upon
a) Nature b) Dimension
c) Physical state d) All of them
Conductance is a quantity used to
describe the
a) Physical state of the conductor
b) Electrical properties of material
c) Dimension of the conductor
d) All of them
The resistivity
of Aluminium in Ωm is
a) 2.59 × 10-8 b) 2.60 × 10-8
c) 2.63 × 10-8 d) None of these
The resistivity of Germanium in Ωm is
a) 0.7 × 10-8 b) 0.5 × 10-8
c) 0.59 × 10-8 d) None of these
The colour code for the colour Grey is
a) 7 b)
8
c) 9 d)
5
A zero ohm resistor is indicated by
a) A single silver colour band
b) A single black band
c) A silver black band
d) None of these
Thermo couples convert heat energy into
a) Mechanical energy b) Chemical energy
c) Electrical energy d) None of these
An accurate measurement of emf of a cell
is made by
a) A voltmeter b) An ammeter
c) A potentiometer d) All of them
Do
bends in a wire affect its electrical resistance
a)
Yes b) No
c)
Affects a little d)
None of these
A 50 volt battery is connected across a
10 ohm resistor. The current is 4.5A. The internal resistance of the battery
is:
a) 1.1 Ω b) 1.2 Ω
c) 1.3 Ω d) 1.4 Ω
A 25 watt and 40 watts bulbs were
connected an a series to a 220V line.
Which electric bulb will grow more brightly?
a) 25 watts bulb b) Neither will give light
c) Both will have same incandescence
d) none
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