## CBSE: NCERT Solutions for Class 12 Physics Chapter 1 Electric Charges & Fields MCQ’s with Answers

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## NCERT **Physics MCQs for Class 12 Question and Answers Chapter 1 **Electric Charges & Fields **PDF**

### Q1. The surface considered for Gauss’s law is called

(a) Closed surface

(b) Spherical surface

(c) Gaussian surface

(d) Plane surface

Option c – Gaussian surface

### Q2. The total flux through the faces of the cube with side of length a if a charge q is placed at corner A of the cube is

Option – a

### Q3. Which of the following statements is not true about Gauss’s law?

(a) Gauss’s law is true for any closed surface.

(b) The term q on the right side side of Gauss’s law includes the sum of all charges enclosed by the surface.

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

(d) Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law

Option c – Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry.

### Q4. A charge Q is placed at the centre of the line joining two point charges +q and +q as shown in the figure. The ratio of charges Q and q is

(a) 4

(b) 1/4

(c) -4

(d) -1/4

Option d – -1/4

### Q5. The force per unit charge is known as

(a) electric flux

(b) electric field

(c) electric potential

(d) electric current

Option b – electric field

### Q6. Electric field lines provide information about

(a) field strength

(b) direction

(c) nature of charge

(d) all of these

Option d – all of these

### Q7. The SI unit of electric flux is

(a) N C-1 m-2

(b) N C m-2

(c) N C-2 m2

(d) N C-1 m2

Option d – N C-1 m2

### Q8. The unit of electric dipole moment is

(a) newton

(b) coulomb

(c) farad

(d) debye

Option d – debye

### Q9. SI unit of permittivity of free space is

(a) Farad

(b) Weber

(c) C2N-1 m-2

(d) C2N-1 m-2

Option c – C2N-1 m-2

### Q10. Consider a region inside which, there are various types of charges but the total charge is zero. At points outside the region

(a) the electric field is necessarily zero.

(b) the electric field is due to the dipole moment of the charge distribution only.

(c) the dominant electric field is inversely pro-portional to r3, for large r (distance from ori-gin).

(d) the work done to move a charged particle along a closed path, away from the region will not be zero.

Option c – the dominant electric field is inversely pro-portional to r3, for large r (distance from ori-gin).

### Q11. Which of the following figures represent the electric field lines due to a single negative charge?

Option – b

### Q12.The surface considered for Gauss’s law is called

(a) Closed surface

(b) Spherical surface

(c) Gaussian surface

(d) Plane surface

Option c – Gaussian surface

### Q13. An electric dipole is placed at an angle of 30° with an electric field of intensity 2 × 105 NC–1, It experiences a torque of 4 Nm. Calculate the charge on the dipole if the dipole length is 2 cm.

(a) 8 mC

(b) 4 mC

(c) 8 μC

(d) 2 mC

Option d – 2mC

### Q14. Two insulated charged metallic sphere P and Q have their centres separated by a distance of 60 cm. The radii of P and Q are negligible compared to the distance of separation. The mutual force of electrostatic repulsion if the charge on each is 3.2 × 10–7 C is

(a) 5.2 × 10–4 N

(b) 2.5 × 10–3 N

(c) 1.5 × 10–3N

(d) 3.5 × 10–4 N

Option b – 2.5 × 10–3 N

### Q15. Calculate the flux through the cuboid shown in the figure for E = E0 y j :-

(a) E0abc

(b) E0abd

(c) E0abcd

(d) Zero

Option a – E0abc

### Q16. Four charges are arranged at the comers of a square ABCD, as shown. The force on the charge kept at the centre O is

Option c – along the diagonal BD

### Q17. Which of the following statements is not true about Gauss’s law?

(a) Gauss’s law is true for any closed surface.

(b) The term q on the right side side of Gauss’s law includes the sum of all charges enclosed by the surface.

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

(d) Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law

Option c – Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry.

### Q18. The surface considered for Gauss’s law is called

(a) Closed surface

(b) Spherical surface

(c) Gaussian surface

(d) Plane surface

Option c – Gaussian surface

### Q19. Consider a region inside which, there are various types of charges but the total charge is zero. At points outside the region

(a) the electric field is necessarily zero.

(b) the electric field is due to the dipole moment of the charge distribution only.

(c) the dominant electric field is inversely proportional to r3, for large r (distance from origin).

(d) the work done to move a charged particle along a closed path, away from the region will not be zero.

Option c – the dominant electric field is inversely proportional to r3, for large r (distance from origin).

### Q20. Electric field lines provide information about

(a) field strength

(b) direction

(c) nature of charge

(d) all of these

Option d – all of these

### Q21. Gauss’s law will be invalid if

(a) there is magnetic monopole.

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

(c) the velocity of light is not a universal constant.

(d) none of these.

Option b – the inverse square law is not exactly true.

### Q22. Which of the following statement is correct? The electric field at a point is

(a) always continuous.

(b) continuous if there is a charge at that point.

(c) discontinuous only if there is a negative charge at that point.

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

Option d – discontinuous if there is a charge at that point.

### Q23. The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by

(a) mge

(b) mg/e

(c) e/mg

(d) e²g/m²

Option b – mg/e

### Q24. Which of the following graphs shows the variation of electric field E due to a hollow spherical conductor of radius R as a function of distance from the centre of the sphere?

Option – a

### Q25. Electric field at a point varies as r° for

(a) an electric dipole

(b) a point charge

(c) a plane infinite sheet of charge

(d) a line charge of infinite length

Option c – a plane infinite sheet of charge

We hope that the given** NCERT MCQ** **Questions for Class 12 Physics with Answers MCQ Chapter 1 Electric Charges & Fields Free Pdf download** will help you in gaining knowledge on the subject.