Physics XII chapter 1 MCQs with Answers
1
charge appears due to
charge appears due to
a.rubbing
b.induction
c.touch
d.all
2
electric feild lines
2
electric feild lines
a.cross each other
b.never cross each other
c.always parallel to each other
d.all
3
Electric field can deflect
3
Electric field can deflect
a)alpha particles
b)beta particles
c)electron
d)all
4
the field in measurng the elctrc potential at a point due to a point charge is
4
the field in measurng the elctrc potential at a point due to a point charge is
a.symmetrical
b.linear
c.radial
d.none
5
the energy required to charge a capacitor of 5micro farad by connecting D.C source of 20KV is
5
the energy required to charge a capacitor of 5micro farad by connecting D.C source of 20KV is
a.10KJ
b.5KJ
c.2kJ
d.1kJ
6
The dielectric constant k of an insulator can be
6
The dielectric constant k of an insulator can be
a)-1
b)0.5
c)0
d)5
7
The unit of potential gradient is
7
The unit of potential gradient is
a)volt/metre
b)volt*meter
c)C/m
d)Volt/ampere
8
Three capacitors of capacitences, 4microF, 2microF, 2microF are connected in parallel there equivalent capacitence will be_______
8
Three capacitors of capacitences, 4microF, 2microF, 2microF are connected in parallel there equivalent capacitence will be_______
a)8microF
b)0.8microF
c)1microF
d)16microF
9
If a 10F capacitor is to have an energy content of 20j , it must be placed across a potential difference of _________
9
If a 10F capacitor is to have an energy content of 20j , it must be placed across a potential difference of _________
a)4volts
b)9volts
c)2volts
d)1volt
10
A charge of 0.10C accelerated through a potentilal difference 0f 1000V acquires k.E
10
A charge of 0.10C accelerated through a potentilal difference 0f 1000V acquires k.E
a)200j
b)10j
c)100j
d)100ev
11
If mica sheet is placed between the plates of a capacitor then capacity_______
11
If mica sheet is placed between the plates of a capacitor then capacity_______
a)increase
b)decrease
c)first increase then decrease
d)first decrease then increase
12
For what value of angle , the electric flux has average value of those of extreme values ?
12
For what value of angle , the electric flux has average value of those of extreme values ?
a)60degree
b)45degree
c)90degree
d)0degree
13
Work done in moving a point charge from one point to another point of equipotential surface is_________
13
Work done in moving a point charge from one point to another point of equipotential surface is_________
a)Delta W =q Delta V
b)Delta W = F delta r
c)zero
d)W=1/4 pi epsilon-not delta V
14
In a charged capacitor the energy resides in
14
In a charged capacitor the energy resides in
a)electric field surrounding the capacity
b)electric field inside the capacitor
c)both a and b
c)gravitational field
15
If the distance b/w the plates of parallel plates condenser is increased, its potential will
15
If the distance b/w the plates of parallel plates condenser is increased, its potential will
a)remain same
b)increase
c)decrease
d)decrease exponentially
16
Electric potential of earth is taken as zero because earth is a good a
16
Electric potential of earth is taken as zero because earth is a good a
a)insulator
b)conductor
c)semiconductor
d)superconductor
17
Equivalent capacitence is greater than individual capacitence in
17
Equivalent capacitence is greater than individual capacitence in
a)series
b)parallel
c)both a and b
d)none
18
The value of the capacitence depends upon the
18
The value of the capacitence depends upon the
a)voltage
b)thickness of the capacitor plates
c)geometry of the capacitor
d)both a and c
19
Electric lines of force are
19
Electric lines of force are
a)imaginery
b)physically existing everywhere
c)physically existing near the charges
d)depend upon case
20
Electric lines of force are
20
Electric lines of force are
a)imaginery
b)physically existing everywhere
c)physically existing near the charges
d)depend upon case
21
--- hav special organs calld ----- that r vry sensitv to elctrc field
21
--- hav special organs calld ----- that r vry sensitv to elctrc field
a.whales+ampullae of shock waves
b.eels+ voltage absrbrs
c.sharks +ampullae of lorenzini
d.bony fishs+currnt genrtr
22
An electric field can deflect
22
An electric field can deflect
a)neutrons
b)gamma rays
c)x-rays
d)none
23
______ cant b created nor destroyed
23
______ cant b created nor destroyed
a.force
b.charge
c.work
d.all
24
The papper on which recquired document is to be copied in photocopier is
24
The papper on which recquired document is to be copied in photocopier is
a)+vely charged
b)-vely charged
c)neutral
d)none
25
if soap bubble is charged then:
25
if soap bubble is charged then:
a. size increases
b. size decreases
c. no change
d. none
26
Capacitance is max whn dielctrc usd is
26
Capacitance is max whn dielctrc usd is
a.paraffind papr
b.bakelite
c.teflon
d.distilld watr
27
N/C =
27
N/C =
a)V/A
b)Vm
c)V/m
d)A/m
28
The unit of relative permitivity are
28
The unit of relative permitivity are
a)Nm-1A-
b)N-1m1C2
c)Nm2C2
d)No unit
29
1 volt=
29
1 volt=
a.coulmb/newton
b.newtn/metr
c.newtn/coulmb
d.joule/coulomb
30
the potencial at a point situated at a distance of 50cm from a charge of 5 micro C is
30
the potencial at a point situated at a distance of 50cm from a charge of 5 micro C is
a.9*10^-4
b.9*10^-2
c.9*10^4V
d.9*10^2V
31
two opposit chrgs point chrgs each of magnitud Q are sprtd by a distanc 2d.Wht is the elctrc potential at a point P mid-way btwen thm?
31
two opposit chrgs point chrgs each of magnitud Q are sprtd by a distanc 2d.Wht is the elctrc potential at a point P mid-way btwen thm?
a.9.6 * 10 -19V
b.5.4 micro V
c.3.67* 10^-2 V
d.O
32
A capacitor of capacity 1micro farad is charged to 1kV .the energy stored in J
32
A capacitor of capacity 1micro farad is charged to 1kV .the energy stored in J
a.5
b.0.5
c.0.005
d.50
33
if product of 2 stationary charges is -ive, then the coulomb force is:
33
if product of 2 stationary charges is -ive, then the coulomb force is:
a. attractive and directed away from source
b. attractive and directed towards source
c. repulsive and directed towards source
d. repulsive and directed away from source charge
34
the coulomb force b/w 2 charges is 80 N , what will be the force b/w them when kept in water:
34
the coulomb force b/w 2 charges is 80 N , what will be the force b/w them when kept in water:
a. 1 N
b. 4 N
c. 80 N
d. none
35
when identical charges r brought closer then
35
when identical charges r brought closer then
a.lateral expension is created
b.neutral zone is created between the charges
c.lateral contraction is crated between charges
d.none
36
dimensions of electric feild intensity is
36
dimensions of electric feild intensity is
a.MLTA
b.MLT-3A-1
C.M2LTA
D.none
37
capacitence of capacitor depends on
37
capacitence of capacitor depends on
geometry of plates
b.medeium between plates
c.area of plates
d.all
38
dielectric is referred as
38
dielectric is referred as
a.conductor
b.insulator
c.air
d.none
39
coulombs force is
39
coulombs force is
a.directly proportional to product of charges
b.invrsly proportional to the distance btween
charges
c.directly proportional to distance btween
charges
d.both a and b
40
capacitor is a device that can
40
capacitor is a device that can
a.produce charge
b.store charge
c.remove charge
d.none
41
if area of two capacitor plates is increased then
41
if area of two capacitor plates is increased then
a.capacitence is increased
b.capacitence is decreased
c.no effect
d.none
42
If the distancee b/w the two point charges become half , then force b/w them
42
If the distancee b/w the two point charges become half , then force b/w them
a)double
b)half
c)four times
d)remains same
43
if C1=5 coulumb, C2=10 coulumb, and both capcitors are connected in parallel in a circuit.then the value of equivalent capcitor is
43
if C1=5 coulumb, C2=10 coulumb, and both capcitors are connected in parallel in a circuit.then the value of equivalent capcitor is
a.15 coulumb
b.3/10 coulumb
c.10/3 coulumb
d.1/15 coulumb
44
if surface density of charge on 2 plates is decreased then
44
if surface density of charge on 2 plates is decreased then
a.capactence should b increased
b.should b decreased
c.doesnt effect
d.none
45
Why does positively charged get object neutral by touching it
45
Why does positively charged get object neutral by touching it
a)electron flow from object
b)electron flow on the object
c)protons flow from the object
d)protons flow on the object
46
smaller values of time constant RC lead to a --- discharg
46
smaller values of time constant RC lead to a --- discharg
a.less rapid
b.more rapid
c.no chnge
d.all possibilties r there
47
On moving a charge of 20 couloms by 2cm ,2j of work is done .then potential different between the points is
47
On moving a charge of 20 couloms by 2cm ,2j of work is done .then potential different between the points is
a.0.1V
b.8V
c.2V
d.0.5V
48
A capacitor is perfect insulator for
48
A capacitor is perfect insulator for
a)direct current
b)Alternating current
c)both a and b
d)rapidly fluctuating current
49
two point charges A and B separated by a distance R attract each other with a force of 12*10^-3N.the force between A and B when the charge on them are doubled and distance is halved
49
two point charges A and B separated by a distance R attract each other with a force of 12*10^-3N.the force between A and B when the charge on them are doubled and distance is halved
a.1.92
b.19.2N
c.12N
d.0.192N
Answer key
1d
2b
3d
4c
5d
6d
7a
8a
9c
10c
11a
12a
13c
14b
15b
16b
17b
18d
19a
20a
21c
22d
23b
24b
25a
26d
27c
28d
29d
30c
31d
32b
33b
34a
35b
36b
37d
38b
39a
40b
41a
42c
43a
44a
45b
46b
47a
48a
49d
Answer key
1d
2b
3d
4c
5d
6d
7a
8a
9c
10c
11a
12a
13c
14b
15b
16b
17b
18d
19a
20a
21c
22d
23b
24b
25a
26d
27c
28d
29d
30c
31d
32b
33b
34a
35b
36b
37d
38b
39a
40b
41a
42c
43a
44a
45b
46b
47a
48a
49d
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