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Quiz: Electric Charges and Fields Online Test (Progressive Test)
Total questions: 472
Questions in this round: 50
Time allotted: 60 minutes
Pass score: 5%
Total rounds: 10
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Quiz: Electric Charges and Fields Online Test (Certificate Challenge)
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Class 12 Physics: Electric Charges and Fields Online Test

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1 / 50

1. A neutral metal sphere is placed near a positively charged rod without touching it. What happens inside the sphere?

a) All charges inside the sphere disappear

b) Protons move toward the rod and leave the metal lattice

c) Electrons shift slightly toward the rod, causing charge redistribution

d) The sphere becomes permanently positively charged without any charge exchange

2 / 50

2. A point charge is fixed in vacuum. A charge is placed away from it. What is the force on the charge using the electric-field method? Take .

a) , toward the source charge

b) , away from the source charge

c) , away from the source charge

d) , toward the source charge

3 / 50

3. Why should the test charge used to define electric field be very small?

a) So that its mass becomes zero

b) So it does not disturb the source charges

c) So that it becomes negative during measurement

d) So that the electric field becomes scalar

4 / 50

4. Use the arrangement described below.

Two equal and opposite charges and are placed at and , respectively. Point P is on the perpendicular bisector above the midpoint.

What is the direction of the net electric field at P?

a) Along -direction

b) Zero because the charges have equal magnitude

c) Along -direction

d) Along -direction

5 / 50

5. Two charges and are fixed apart. At what distance from the charge, between the charges, is the net electric field zero?

6 / 50

6. A spherical shell of radius carries charge . What is the electric field magnitude at a point from its centre?

7 / 50

7. The approximate value of , the permittivity of free space, is:

8 / 50

8. A neutral body loses electrons. What is the charge left on the body?

9 / 50

9. Assertion: Electric field is a vector quantity.
Reason: Electric field is defined as force per unit positive test charge, and force is a vector.

a) Both Assertion and Reason are true, but Reason does not explain Assertion

b) Assertion is true, but Reason is false

c) Both Assertion and Reason are true, and Reason explains Assertion

d) Assertion is false, but Reason is true

10 / 50

10. Which Gaussian surface is most suitable for finding the field due to an isolated point charge?

a) A sphere centred on the point charge

b) A pillbox with the charge on one flat face

c) An arbitrary open surface

d) A cylinder with the charge on its curved surface

11 / 50

11. Two equal perpendicular electrostatic forces act on a charge: one along and the other along . If each force has magnitude , what is the magnitude of the net force?

12 / 50

12. A diagram shows electric field lines leaving one object and ending on another object. What can be inferred about the signs of the two objects?

a) The first object is negative and the second is positive

b) Both objects must be neutral

c) The first object is positive and the second is negative

d) Both objects must be negative

13 / 50

13. A uniformly charged thin spherical shell has surface charge density and radius . What is its total charge?

14 / 50

14. A graph is plotted between torque magnitude and for a fixed dipole in a fixed uniform electric field. What is the slope of the graph?

15 / 50

15. A spherical Gaussian surface is chosen for a point charge not located at the centre of the sphere. What remains true?

a) is constant everywhere on the sphere despite the off-centre charge

b) The flux must be zero

c) Net flux remains

d) is parallel to everywhere

16 / 50

16. What is the electric field inside a uniformly charged thin spherical shell?

17 / 50

17. Use the arrangement described below.

On the -axis, a charge is fixed at , and a charge is fixed at .

What is the direction of the electric dipole moment?

a) Along -direction

b) Along -direction

c) Along -direction

d) Zero because the net charge is zero

18 / 50

18. Which expression correctly states Gauss's law?

19 / 50

19. Assertion: The net charge of an electric dipole is zero.
Reason: An electric dipole consists of two equal and opposite charges.

a) Both Assertion and Reason are true, and Reason explains Assertion

b) Assertion is true, but Reason is false

c) Assertion is false, but Reason is true

d) Both Assertion and Reason are true, but Reason does not explain Assertion

20 / 50

20. What is the work done by an external agent in slowly rotating a dipole from to in a uniform electric field?

21 / 50

21. A uniform electric field passes through a square open surface of area . The chosen area vector is . What is the flux?

22 / 50

22. Which sequence correctly describes charging a neutral metal sphere positively by induction using a negatively charged rod?

a) Earth the sphere first, remove the earth connection, then bring the rod near the sphere

b) Bring the negative rod near the sphere and remove it without earthing

c) Bring the negative rod near, earth the sphere, disconnect Earth, then remove the rod

d) Touch the rod to the sphere, remove the rod, then earth the sphere

23 / 50

23. Which row correctly compares fields due to idealized charge distributions?

Row	Distribution	Field dependence on distance
P	Point charge
Q	Infinite line charge
R	Infinite plane sheet
S	Infinite plane sheet

Which rows are correct?

a) P and S only

b) Q and S only

c) P, Q, R and S only

d) P, Q and R only

24 / 50

24. Which graph description correctly represents versus for a uniformly charged solid sphere of radius ?

a) Rises linearly inside; peaks at ; falls outside

b) for , and for

c) is constant for all

d) Inverse-square inside; maximum at ; zero outside

25 / 50

25. Use the arrangement described below.

Three points lie on the -axis. Point P is at , point Q is at , and point R is at . A charge is placed at P and a charge is placed at R.

What is the direction of the force on the charge at P due to the charge at R?

a) Along -direction

b) Along -direction

c) Along -direction

d) Zero because the charges are separated by

26 / 50

26. Which row correctly describes torque and potential energy for a dipole in a uniform electric field?

Row	Angle	Torque	Potential energy
P
Q
R
S

a) Row S

b) Row Q

c) Row R

d) Row P

27 / 50

27. Study the table and identify the row with the incorrect description.

Row	Quantity or symbol	Description
P	Electric charge	Scalar quantity with sign
Q	and	Two kinds of charge
R		SI unit of electric charge
S	Sign of charge	Direction of charge as a vector

a) Row S

b) Row P

c) Row R

d) Row Q

28 / 50

28. Which statement best explains why electrostatic field lines do not form closed loops?

a) A field line can close only if it intersects another line

b) Electrostatic field lines have no direction

c) They start or end on charges or infinity, not closed loops

d) Closed loops are required only when the field is very strong

29 / 50

29. Which graph description is correct for a uniformly charged thin spherical shell?

a) inside the shell, then decreases as outside

b) decreases as both inside and outside

c) is constant inside and outside the shell

d) increases linearly from the centre to the surface, then decreases as

30 / 50

30. Which Gaussian surface is usually chosen for an infinitely long uniformly charged straight wire?

a) A flat circular disk perpendicular to the wire only

b) A cube with one edge touching the wire

c) A coaxial cylinder around the wire

d) A sphere centred at one point of the wire

31 / 50

31. Which SI unit is equivalent to the unit of electric field?

32 / 50

32. Which row correctly identifies the source from the change in field when distance is doubled?

Row	Change when becomes	Likely source
P	becomes	Point charge
Q	becomes	Infinite line charge
R	remains	Infinite plane sheet
S	becomes	Far dipole

a) P and Q only

b) Q, R and S only

c) P, Q, R and S

d) P, Q and R only

33 / 50

33. Two point charges and in vacuum are separated by . Their force magnitude is . Which row gives a correct changed condition and force?

Row	Changed condition	New force
P	doubled, unchanged
Q	and doubled, unchanged
R	doubled, charges unchanged
S	halved, charges unchanged

a) Rows Q and S only

b) Rows P and R only

c) Row Q only

d) Row P only

34 / 50

34. Study the table and identify the row with the correct description.

Row	Dipole quantity	Description
P	Net charge of dipole
Q	Dipole moment magnitude
R	Direction of	From to
S	Unit of

a) Row Q

b) Row S

c) Row P

d) Row R

35 / 50

35. A dipole has potential energy in a uniform electric field. If it rotates from to , what is the change in potential energy?

36 / 50

36. Complete the statement correctly: In electrostatics, like charges ______ and unlike charges ______.

a) repel; attract

b) repel; repel

c) attract; repel

d) attract; attract

37 / 50

37. Which option gives the correct SI unit of the Coulomb constant ?

38 / 50

38. Which statement correctly compares a charged conductor and a uniformly charged insulating solid sphere?

a) Both have charge only on their outer surfaces

b) Both must have everywhere inside

c) A conductor has inside, while an insulating solid sphere has inside

d) Conductor: inside; insulating solid sphere: inside

39 / 50

39. Two fixed charges are placed at and . A third charge is placed at the origin. What is the net force on ?

a) Along -direction

b) Along -direction

c) Along -direction

d) Zero

40 / 50

40. A uniformly charged solid sphere has radius . At , the field is . At , the field is . What is ?

41 / 50

41. A uniformly charged solid sphere and a uniformly charged thin spherical shell have the same total charge and radius . Which comparison is correct at ?

a) Both fields are zero

b) Both fields are equal to

c) The shell field is zero, while the solid-sphere field is non-zero

d) The solid-sphere field is zero, while the shell field is non-zero

42 / 50

42. Use the field-line description below.

Several electric field lines are drawn from left to right. In region P, the lines are close together. In region Q, the lines are farther apart. The lines do not cross.

Which statement is correct?

a) The electric field is zero in region P because the lines are crowded

b) The electric field is stronger in region P than in region Q

c) The electric field is stronger in region Q than in region P

d) The field direction is opposite to the direction of the lines

43 / 50

43. Which Gaussian surface is suitable for finding the field of a uniformly charged thin spherical shell?

a) A coaxial cylinder

b) A concentric spherical surface

c) An open circular disk

d) A pillbox crossing the shell at one point

44 / 50

44. A point charge is at the centre of a spherical Gaussian surface. If the radius of the surface is doubled, which quantity remains unchanged and which quantity becomes one-fourth?

a) Both total flux and field magnitude remain unchanged

b) Both total flux and field magnitude become one-fourth

c) Flux stays unchanged; field on the surface becomes one-fourth

d) Field magnitude remains unchanged; total flux becomes one-fourth

45 / 50

45. A particle of charge is placed in an electric field . What is the force on it?

46 / 50

46. In an electric dipole, the electric dipole moment is directed:

a) Perpendicular to the line joining the charges

b) Opposite to the electric field at every point

c) From to

d) From to

47 / 50

47. Two charges and are separated by in vacuum. What is the magnitude of the force between them? Take .

48 / 50

48. Which row correctly compares a uniformly charged thin spherical shell and a uniformly charged solid sphere?

Row	Distribution	Inside field for
P	Thin spherical shell
Q	Uniform solid sphere
R	Thin spherical shell
S	Uniform solid sphere

Which rows are correct?

a) P and S only

b) P and Q only

c) R and S only

d) Q and R only

49 / 50

49. A uniform electric field is parallel to a plane surface. What is the electric flux through that surface?

a) Zero

b) Negative maximum

c) Equal to

d) Maximum

50 / 50

50. A small dipole is aligned with a non-uniform electric field whose magnitude increases in the direction of . What is the qualitative direction of the net force on the dipole?

a) Toward stronger field

b) Perpendicular to

c) Zero in every case because the dipole is neutral

d) Toward weaker field

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