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WorksheetsCurrent Electricity Quiz
Total questions: 51
Worksheet time: 29mins
Motion of electrons in conductor is :
Uniform
accelerated
drifting
decelerated
point rule of Kirchoff’s follows the law of conservation of:-
energy
charge
Momentum
Mass
Ohm's law is followed by
Conductor
Semiconductor
Insulator
Both (a) and (b)
The resistivity of material of a conductor depends on
length
Area of cross-section
temperature
all of above
If the length of conducting wire is stretched to double its length. how many times its resistance will be:-
Two times
Three times
Four times
Not change
A wire of 1 resistance is divided into four equal parts & connected in parallel combination, then resistance of combination will be:-
4
1
1/4
1/16
You have three resistance of 1 , then minimum resistance that can obtained due to its combination:-
1
1/2
2
1/3
The equivalent resistance of resistors in parallel combination
increases
decreases
remains same
none of these
Ohm's law is valid when the temperature of conductor is
very low
very high
varying
constant
Electron volt measures the:-
Charge
Potential difference
current
Energy
Power of electric circuit is :-
V. R
V^2/R
V^2/R
V^2R I
Killowatt hour (kWh) is the unit of:-
Power
Energy
Torque
NOT
Ampere-hour is the unit of:-
Power
Charge
Energy
P.d.
The example of a non-ohmic resistance is
Copper wire
filament lamp
carbon resistor
diode
When an electron goes from one point to other point in equipotential region, then work done
On electron
By electron
not work done
infinity work done
If σ = conductivity and = resistivity which relation is correct
σ = 1/
σ =
σ = 1/
None of these
Dimension formulae of resistivity of wire is :-
[ML^3T^-3I^-2]
[ML^2T^-3I^-2]
[ML^3T^1I^-2]
[ML^2T^-3I^-1]
Two cells of e.m.f. e1 and e2 which internal resistance is r1 and r2 are connected in parallel combination. Its equivalent e.m.f. is:-
(e1 + e2)/(r1 + r2)
(e1 + e2)/(r2 + r1)
(e1 + e2)
(e1 + e2)
Two resistance of 2 and 4 are connected in parallel combination. Then ratio of heat generated in circuit through them is :-
2 : 1
1 : 2
4 : 1
1 : 4
If J= current density, σ = conductivity and E = electric field, which relation is correct
J= σ/E
J= σE
J= E
none of these
Which type of the material used for the potentiometer wire
constantan
Manganin
Both (A) and (B)
none of these
Kirchhoff’s law is the result of :-
non conservative form of electric field
conservative form of electric field
conservative form of magnetic field
non conservative form of magnetic field
Two cells having e.m.f. E1 and E2 & due to this cells length of null point is l1 and l2 on wire of potentiometer, then:-
l1 * l2 = ε1 * ε2
l1/l2 = ε1/ε2
l1/l2 = ε2/ε1
l1 * l2 = ε1 * ε2
In parallel combination of n cells we obtain
more voltage
more electric current
less voltage
less electric current
If E be the electric field and T be the relaxation time in a conductor, the drift velocity will be
V=eET/m
Vd = neA
meE/T
me^2E/T
Copper and germanium wire are cooled to 80 K from temperature. The resistance of :-
Both wire decreases
Both wire increases
copper wire decreases and Germanium wire increases
Germanium wire decreases and Copper wire increases.
Dimension formulae of e.m.f. is –
[ML^2T^-2]
[ML^2I^-1T^-2]
[MLT^-2]
[ML^2I^-1T^-3]
In an electric circuit algebraic sum of all current at a point is:-
zero
positive
negative
none of these
The property of a circuit that converts electrical energy into heat is called as:-
Electromotive force
Current
Voltage
Resistance
If a current of 1 A is flowing in a wire through a wire, then number of electrons flowing per second through wire is:- (Let charge on one electron = 1.6 10 -19 C)
0.625 10 13
0.625 10 19
1.6 10 -19
1.6 10 19
There are n identical resistor first all connected in series and then all connected in parallel. The ratio of total resistance in series to that in parallel will be-
n^2
n
n^4
none
On increasing the temperature of a metal its resistance-
increase
decreases
remains constant
none
The ammeter and voltmeter are connected with electrical circuit in:-
Series combination and Parallel combination respectively
Parallel combination and Series combination respectively
Both are in series combination
Both are in parallel combination
Two cells of equal emf are connected in parallel combination, then equivalent emf is:-
Only equal to emf of one cell.
Half of the emf of one cell
Double to the emf of one cell
None of these
Wheat stone bridge measures the :-
High resistance
low resistance
High & low resistance
Potential difference
The dimensions of resistance are given by
[ ML2T -3 A -2 ]
[ MLT -2 A -2 ]
[ MLT -2 A -1 ]
[ MLT -2 A]
The SI unit of specific resistance or resistivity is
Ω.m
Ω.m^2
A.m
A.m -1
The emf of a cell can be measured by:-
Potentiometer
Voltmeter
Galvanometer
Ammeter
The resistance of an electric circuit is halved at constant voltage, the heat generated will be: -
half
two times
four times
same
Two bulb of 60W and 40W are connected in series combination, then equivalent power is:-
100 W
2400 W
30 W
24 W
Two bulb of power (15W-220V) and (60W-220V). Ratio of resistance of their filament is:-
1 : 4
4 : 1
1 : 2
2 : 1
If bulb of 60W and 40W is connected in series combination, then:-
60 W bulb will be more illuminated
40 W bulb will be more illuminated
same illumination for both bulb
Only 60 watts will be illuminated
Electrical energy is converted into heat :-
only when electric current pass through resistance
only when current flows through the junction of two different metals
in both condition when current pass through a resistance and when current flows through the junction of two different metals
none of these
1 kWh is equal to
10^5 J
10^3 J
3.6 x 10^4 J
3.6 x 10^6 J
The resistance of an ideal ammeter is
Zero
Very small
Very large
infinite
Heat generated by 5 register in 20 minute when potential difference is 7 V
140 cal
280 cal
700 cal
2800 cal
The electrical appliances in our houses are connected across supply switch in
series
parallel
mixed grouping
none of these
If the e.m.f. of a dry cell is 1.5 V and its internal resistance is 0.5 . If current due to this cell in external resistance is 1 A, then terminal potential difference of cell is
1.5 V
1 V
0.5 V
0 V
Cell of emf 1.5V is connected directly through 0.05 resistor, if current in circuit is 2A, then internal resistance of cell is:-
0.7
0.8
0.9
1
Kirchhoff's loop rule is based on conservation of
mass
charge
energy
none of these
The specific resistance of a rod of copper as compared to that of thin wire of copper is
less
more
same
none of these
