NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 1 Electric Charges and Field Sample Test,Sample questions

Question:
1 coulomb is equal to:

1.3 × 109 e.s.u.

2.13 × 109 e.s.u

3.3 × 1010 e.s.u

4.13 × 1010 e.s.u.


Question:
1 V equals to:

1.1 J

2.1 JC-1

3.1 CJ-1

4.1 JC


Question:
1 V m-1 equals to:

1.1 N

2.1 Mm-1

3.1 NC-1

4.1 J-1


Question:
A parrot comes and sits on a bare high power line. It will:

1. experience a mild shock ‘

2.experience a strong shock

3.get killed instantaneously

4.not be affected practically


Question:
A soap bubble is given a negative charge, then its radius:

1.increases

2.decreases

3.Remains unchanged

4.may increase or decrease


Question:
A soap bubble is given a negative charge, then its radius:

1.increases

2.decreases

3.Remains unchanged

4.may increase or decrease


Question:
An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is :

1.1.6 ms-2

2.1.6 × 1018ms-2

3.0.8 × 1018 ms-2

4.0.8 × 1018 ms-2


Question:
Corona discharge takes place:

1.at the surface of a conductor

2.near the sharp points of a conductor

3.outside the conductor

4.at the centre of the conductor


Question:
Each of the two point charges are doubled and their distance is halved. Force of interaction becomes p times, w here p is :

1.1

2.4

3.116

4.16


Question:
Electric field in a cavity of metal:

1.depends upon the surroundings

2.depends upon the size of cavity

3. is always zero

4.is not necessarily zero


Question:
If an electric dipole is kept in a uniform electric field then resultant electric force on it is :

1.always zero

2.never zero

3.depend upon capacity of dipole

4.None


Question:
If sphere of bad conductor is given charge then it is distributed on:

1.surface

2.inside the surface

3.only inside the surface

4.None


Question:
If two conducting sphere are connected after charging separately then

1.Electrostatic energy sphere energy will remain conserved

2.Electrostatic energy charges remains conserved

3.Electrostatic energy energy and charge remains conserved

4.None


Question:
In non-uniform electric field, electric dipole experiences:

1.torque only

2.torque as well as net force

3.force only

4.None of the above


Question:
oulomb’s law in vector form can be written as
F⃗  = (14πεn) (q1q2r2)r⃗ 
where ε0 is the permitivity of free space. The SI units of ε0 will be:

1.N-1m-2C-2

2.Nm-2C2 (

3. N-1m-2C9

4.Nm-2C2


Question:
Quantisation of charge implies:

1.Charge does not exist

2.Charge exists on particles

3.There is a minimum permissible magnitude of charge

4.Charge can’t be created


Question:
The belt of a Vande Graaf generator gets charge by :

1.corona discharge (b) (c)

2.induction

3.electrification

4.None of the these


Question:
The conservation of electric charge implies that:

1.Charge can’t be created

2.Charge can’t be destroyed

3.The number of charged particle in the universe is constant

4.Simultaneous creation of equal and opposite charges is permissible


Question:
The dielectric constant of a metal is:

1. 0

2.1

3.∞

4.-1


Question:
The dimensional representation of cu will be :

1.[MLT4 A2]

2.[M-1L-3T4A2]

3.[ML-2T ]

4.None of the above


Question:
The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :

1.straight line

2.parabola

3.hyperbola

4.None of the above


Question:
The minimum amount of charge observed so far is:

1.1 C

2.4.8 × 1-13 C

3.1.6 × 10-19 C

4.1.6 × 1019 C


Question:
The number of electron-taken out from a body to produce 1 coulomb of charge will be :

1.6.25 × 1018

2.625 × 1018

3.6.023 × 1023

4.None


Question:
The number of electrons contained in one coulomb of charge is:

1.6.25 × 1018

2.6.25 × 1017

3.6.25 × 1019

4.1.6 × 1019


Question:
The SI units of electric dipole moment are:

1.C

2. Cm-1

3.Cm

4.Nm-1


Question:
The unit of intensity of electric field is :

1.metre/volt

2.Joule/newton

3.Coulomb/newton

4.Newton/coulomb


Question:
The unit of intensity of electric field is :

1.metre/volt

2.Joule/newton

3.Coulomb/newton

4.Newton/coulomb


Question:
The work done in rotating an electric dipole in an electric field:

1.W = ME (1 – cos θ)

2.W = ME tan θ

3.W = ME sec θ

4.None


Question:
Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :

1.+3q

2. +2q

3.-3q

4.-4q


Question:
Two point charges +8q and -2q are located at ,v = O and ,v = L respectively. The location of a point on the .v-axis at which the net electric field due to these two point charges b is zero :

1.4L

2.8L

3.L/4

4.2L


Question:
When placed in a uniform field, a dipole experiences:

1.a net force

2.a torque

3.both a net force and torque

4.neither a net force nor a torque


Question:
Which one of the following is the unit of electric field?

1.Coulomb

2.Newton

3.Volt

4.N/C


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