Electric Charges and Fields MCQ Questions for Class 12 Physics Chapter 1 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Physics book Chapter 1 Electric Charges and Fields with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Electric Charges and Fields. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.


NCERT MCQ Chapters for Class 12 Physics

Q1. The force per unit charge is known as

(i) electric flux
(ii) electric field
(iii) electric potential
(iv) electric current

(ii) electric field


Q2. The work done in rotating an electric dipole in an electric field:

(i) W = ME (1 – cos θ)
(ii) W = ME tan θ
(iii)W = ME sec θ
(iv) None

(i) W = ME (1 – cos θ)


Q3. A charge Q is divided into two parts of q and Q – q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be

(i) 2:1
(ii) 1/2
(iii) 4:1
(iv) 1/4

(i) 2:1


Q4. Which of the following is the best insulator?

(i) Carbon
(ii) Paper
(iii) Graphite
(iv) Ebonite

(iv) Ebonite


Q5. A material in which electrons are tightly bound and cannot move freely at room temperature is called a/an

(i) Insulator
(ii) Semiconductor
(iii) Superconductor
(iv) Conductor

(i) Insulator


Q6. Which of the following statements is not true about Gauss’s law?

(i) Gauss’s law is true for any closed surface.
(ii) The term q on the right side side of Gauss’s law includes the sum of all charges enclosed by the surface.
(iii) Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry.
(iv) Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law

(iii) Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry.


Q7. If an electric dipole is kept in a uniform electric field then resultant electric force on it is :

(i) always zero
(ii) never zero
(iii) depend upon capacity of dipole
(iv) None

(i) always zero


Q8. Two similar spheres having +Q and -Q charges are kept at a certain distance. F force acts between the two. If at the middle of two spheres, another similar sphere having +Q charge is kept, then it experiences a force in magnitude and direction as

(i) zero having no direction.
(ii) 8F towards +Q charge.
(iii) 8F towards -Q charge.
(iv) 4F towards +Q charge.

(iii) 8F towards -Q charge.


Q9. On rubbing, when one body gets positively charged and other negatively charged, the electrons transferred from positively charged body to negatively charged body are

(i) valence electrons only
(ii) electrons of inner shells
(iii) both valence electrons and electrons of inner shell
(iv) yet to be established

(i) Valence electrons are outermost electrons these can get transferred on rubbing.


Q10. The surface considered for Gauss’s law is called

(i) Closed surface
(ii) Spherical surface
(iii) Gaussian surface
(iv) Plane surface

(iii) Gaussian surface


Q11. 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 :

(i) +3q
(ii) +2q
(iii) -3q
(iv) -4q

(i) +3q


Q12. In general, metallic ropes are suspended on the carriers taking inflammable materials. The reason is

(i) to control the speed of the carrier.
(ii) to keep the centre of gravity of the carrier nearer to the earth.
(iii) to keep the body of the carrier in contact with the earth.
(iv) none of these.

(iii) to keep the body of the carrier in contact with the earth.


Q13. Charge is

(i) transferable
(ii) associated with mass
(iii) conserved
(iv) All of these

(iv) All of these


Q14. The unit of electric dipole moment is

(i) newton
(ii) coulomb
(iii) farad
(iv) debye

(iv) debye


Q15. Which one of the following is the unit of electric field?

(i) Coulomb
(ii) Newton
(iii) Volt
(iv) N/C

(iv) N/C


Q16. When a glass rod is rubbed with silk, it

(i) gains electrons from silk.
(ii) gives electrons to silk.
(iii) gains protons from silk.
(iv) gives protons to silk.

(ii) gives electrons to silk.


Q17. Charge is the property associated with matter due to which it produces and experiences

(i) electric effects only
(ii) magnetic effects only
(iii) both electric and magnetic effects
(iv) None of these

(iii) both electric and magnetic effects


Q18. Electric field in a cavity of metal:

(i) depends upon the surroundings
(ii) depends upon the size of cavity
(iii) is always zero
(iv) is not necessarily zero

(iv) is not necessarily zero


Q19. Electric field at a point varies as r° for

(i) an electric dipole
(ii) a point charge
(iii) a plane infinite sheet of charge
(iv) a line charge of infinite length

(iii) a plane infinite sheet of charge


Q20. When a body is charged by induction, then the body

(i) becomes neutral
(ii) does not lose any charge
(iii) loses whole of the charge on it
(iv) loses part of the charge on it

(ii) does not lose any charge


Q21. The charge developed on a glass rod when rubbed with silk cloth is:

(i) Always negative
(ii) Positive
(iii) May be positive or negative
(iv) Depends on type of rubbing

(ii) Positive


Q22. Trajectory of an electron when it moves perpendicular to the electric field is

(i) Parabolic
(ii) Circular
(iii) Straight
(iv) Hyperbolic

(i) Parabolic


Q23. Which of the following statement is correct? The electric field at a point is

(i) always continuous.
(ii) continuous if there is a charge at that point.
(iii) discontinuous only if there is a negative charge at that point.
(iv) discontinuous if there is a charge at that point.

(iv) discontinuous if there is a charge at that point.


Q24. Gauss’s law will be invalid if

(i) there is magnetic monopoles.
(ii) the inverse square law is not exactly true.
(iii) the velocity of light is not a universal constant.
(iv) none of these.

(ii) the inverse square law is not exactly true.


Q25. Four charges equal to -Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium the value of q is

(i) −Q/4 (1 + 2√2)
(ii) Q/4 (1 + 2√2)
(iii) −Q/2 (1 + 2√2)
(iv) Q/2 (1 + 2√2)

Irrational


Q26. In annihilation process, in which an electron and a positron transform into two gamma rays, which property of electric charge is displayed?

(i) Additivity of charge
(ii) Quantisation of charge
(iii) Conservation of charge
(iv) Attraction and repulsion

(iii) Conservation of charge


Q27. What happens when some charge is placed on a soap bubble?

(i) Its radius decreases
(ii) Its radius increases
(iii) The bubble collapses
(iv) None of these

(ii) Its radius increases


Q28. Electric field at a point varies as r° for

(i) an electric dipole
(ii) a point charge
(iii) a plane infinite sheet of charge
(iv) a line charge of infinite length

(iii) a plane infinite sheet of charge


Q29. The electric field intensity due to an infinite cylinder of radius R and having charge q per unit length at a distance air r (r > R) from its axis is

(i) directly proportional to r².
(ii) directly proportional to r3.
(iii) inversely proportional to r.
(iv) inversely proportional to r².

(iii) inversely proportional to r.


Q30. Coulomb’s law is true for

(i) atomic distances (= 10–11 m)
(ii) nuclear distances (= 10–15 m)
(iii) charged as well as uncharged particles
(iv) all the distances

(iv) all the distances


Q31. The SI unit of electric flux is

(i) N C-1 m-2
(ii) N C m-2
(iii) N C-2 m2
(iv) N C-1 m2

(iv) N C-1 m2


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