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Class 12 Physics
Electrostatic Potential And Capacitance
Quiz 1
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The dimensions of fall of potential per unit distance are given by:
0%
[MLT
-3
A
-1
]
0%
[ML
2
T
-2
A
-1
]
0%
[ML
2
T
-2
A
-3
]
0%
[MLT
-2
A
-2
]
Explanation
[ML
2
T
-2
A
-3
]
Which of the following is blocked by a capacitor?
0%
A.C.
0%
D.C.
0%
Both A.C. and D.C.
0%
Neither A.C. nor D. C
Explanation
D.C.
Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge?
0%
Solid sphere
0%
Hollow sphere
0%
Both will have an equal charge
0%
None of these
Explanation
Both will have an equal charge
The capacitance of a capacitor will decrease if we introduce a slab of:
0%
copper
0%
aluminium
0%
zinc
0%
None of these
Explanation
None of these
Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor?
0%
72 V
0%
60 V
0%
48 V
0%
zero
Explanation
72 V
In which of the following forms is the energy stored in a capacitor?
0%
Charge
0%
Potential
0%
Capacitance
0%
Electric field
Explanation
Electric field
Two conducting spheres of radii r
1
and r
2
are equally charged. The ratio of their potential is
0%
(r
1
/r
2
)²
0%
(r
1
r
2
)²
0%
(r
1
/r
2
)
0%
(r
2
/r
1
)
Explanation
(r
1
r
2
)²
Twenty seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop?
0%
180 V
0%
90 V
0%
120 V
0%
45 V
Explanation
90 V
The P.E. of an electric dipole is maximum when it makes an angle θ with electric field. The value of θ is :
0%
\(\frac{π}{2}\)
0%
π
0%
zero
0%
\(\frac{3π}{2}\)
Explanation
π
The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :
0%
1.8 J
0%
2.4 J
0%
1.8 µJ
0%
2.4 µJ
Explanation
2.4 J
An electron initially at rest is accelerated through a potential difference of one volt. The energy gained by electron is:
0%
1 J
0%
1.6 × 10
-19
J
0%
10
-19
J
0%
None of these
Explanation
1.6 × 10
-19
J
A bird sitting on a high power line:
0%
gets killed instantly
0%
gets a mild shock
0%
gets a fatal shock
0%
is not affected practically
Explanation
is not affected practically
Choose the SI unit of electric potential energy :
0%
Joule
0%
Coulomb
0%
Netwon per coulomb
0%
Erg
Explanation
Joule
The capacitance of earth, viewed as a spherical conductor of radius 6408 km is:
0%
1420 µF
0%
712 µF
0%
680 µF
0%
540 µF
Explanation
712 µF
A capacitor is connected to a cell of emf E having some internal resistance r, the potential across the:
0%
cell is < E
0%
cell is E
0%
cell is > E
0%
capacitor is E
Explanation
cell is E
If a +ve charge is moved from low to high potential region, the electric potential energy:
0%
decreases
0%
increases
0%
remain the same
0%
may increase or decrease
Explanation
increases
A capacitor is connected across a battery and the plate separation of capacitor is increased without removing the battery, then:
0%
capacitance will increase
0%
charge stored will increase
0%
energy stored will decrease
0%
potential difference will increase
Explanation
energy stored will decrease
Two capacitors of 3 µF and 6 µF are connected in series with a battery of P.d. 12 V. The P.d. across 3µF and 6µF capacitors respectively will be :
0%
8 V, 4 V
0%
6 V, 6 V
0%
4 V, 8 V
0%
9 V, 3 V
Explanation
8 V, 4 V
An electric charge of 425 f µC is removed from a fully charged capacitor of capacitance 8.5µF. Its potential will be lowered by:
0%
75 V
0%
100 V
0%
85 V
0%
50 V
Explanation
100 V
Minimum number of capacitor of 2µF each required to obtain a capacitance of 5µF will be:
0%
4
0%
3
0%
5
0%
6
Explanation
4
0 h : 0 m : 1 s
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