MDCAT XII Physics Electrostatics Online Test-2

Instructions for MDCAT XI Physics Electrostatics Online Test-2:

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Test Details:

Subject: Physics
Class: 1st year / XII
Chapter Name: Electrostatics
Test: MDCAT 2025
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

Created on April 19, 2025 By

medicoengineer.com

MDCAT XII Physics Electrostatics Online Test-2

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NameEmailPhone Number

1 / 50

1. Which one is/are correct regarding gravitational and electrostatic forces?

a) Electrostatic forces are long-range forces and gravitational forces are short-range.

b) Electrostatic forces act only on charged particles, and gravitational forces act only on uncharged particles

c) Electrostatic forces are weaker than gravitational forces.

d) None of these

2 / 50

2. What is the potential at 2 cm from the center of a 4 microcoulomb charged sphere of diameter 8 cm?

a) 4.5 × 10⁵

b) 45 × 10⁵

c) 9 × 10⁵

d) 90 × 10⁵

3 / 50

3. The concept of the electric field was given by:

a) Albert Einstein

b) Coulomb

c) Faraday

d) Faraday and Coulomb

4 / 50

4. What is the electric flux through a surface of 5 m² placed parallel in a uniform field of 10 N/C?

a) 5

b) 50

c) 500

d) 0

5 / 50

5. Flux through a surface depends on:

a) Area of the surface

b) Charges enclosed in the surface

c) Shape of the area

d) All of these

6 / 50

6. What is the electric field of a 10 C charge that is experiencing a force of 50 N?

a) 10 N/C

b) 50 N/C

c) 5 N/C

d) 100 N/C

7 / 50

7. If the potential on a capacitor is doubled, what will happen?

a) Capacitance becomes doubled

b) Charge stored becomes doubled

c) Energy stored decreases

d) Both a and b

8 / 50

8. Potential energy stored in a capacitor of 10 F when the charge stored is 2 C is:

a) 10 J

b) 20 J

c) 100 J

d) 200 J

9 / 50

9. Force between two charges placed at distance r is F. When the distance between them is reduced to one-third, the force becomes:

a) F

b) 3F

c) 9F

d) 16F

10 / 50

10. When a dielectric material is placed between the plates of a capacitor, the capacitance of the capacitor:

a) Increases

b) Decreases

c) May increase or decrease

d) Can’t be determined

11 / 50

11. Which one has the maximum dielectric constant?

a) Air

b) Vacuum

c) Water

d) Mica

12 / 50

12. What is the value of electric potential at 4 m away from a 4 microcoulomb charge?

a) 1800

b) 18,000

c) 900

d) 9,000

13 / 50

13. Four capacitors each of 6 F are connected as shown in the diagram. What is the equivalent capacitance between A and B?

a) 3 F

b) 6 F

c) 24 F

d) 8 F

14 / 50

14. Time constant is the duration in which 63.2% of the ------- charge of a capacitor is deposited on its plates.

a) Average

b) Maximum

c) Minimum

d) Either of the above

15 / 50

15. Potential gradient at any point in an electric field is equal to:

a) Electric field intensity

b) Electric flux intensity

c) Electric potential intensity

d) None of these

16 / 50

16. What is the potential gradient between two charged plates separated by 2 cm when the potential difference is 2 V?

a) 20

b) 200

c) 10

d) 100

17 / 50

17. Select incorrect statement regarding electric field lines:

a) They do not intersect each other.

b) Electric field lines exist physically in the electric field.

c) These are endless.

d) All of these

18 / 50

18. An electric dipole is a system which contains:

a) Two same charges of equal magnitude

b) Two same charges of unequal magnitude

c) Two opposite charges of equal magnitude

d) Two opposite charges of unequal magnitude

19 / 50

19. Some capacitors are connected in series. When two other capacitors are added in the same way, the capacitance:

a) Will increase

b) Will decrease

c) May increase or decrease

d) Will remain the same

20 / 50

20. The figure shows:

a) Electric field of two equal and same charges

b) Electric field of two unequal and same charges

c) Electric field of two equal and different charges

d) Electric field of two unequal and different charges

21 / 50

21. Sharks have the potential to:

a) Sense electric fields

b) Detect potential difference

c) Both a and b

d) None of these

22 / 50

22. The diagram shows that the electric flux through the surface is:

a) Maximum

b) Minimum

c) Zero

d) Can’t be determined

23 / 50

23. Electric ---------- is the work done on a charge to move it from -------- potential to -------- potential.

a) Gradient, lower, higher

b) Gradient, higher, lower

c) Potential, higher, lower

d) Potential, lower, higher

24 / 50

24. The energy of a charged capacitor resides in:

a) Dielectric constant

b) Electric field

c) On plates

d) Both a and b

25 / 50

25. A charge of magnitude 0.5 C is accelerated through a potential difference of 500 V. How much kinetic energy is acquired by the charge?

a) 50

b) 250

c) 500

d) 1000

26 / 50

26. RC constant is measured in:

a) Volts

b) Ohms

c) Farads

d) Seconds

27 / 50

27. In which combination is capacitance increased by decreasing the number of capacitors?

a) Series combination

b) Parallel combination

c) Both series and parallel combination

d) Can’t be determined

28 / 50

28. Electric field around a charge is:

a) Real

b) Imaginary

c) Either real or imaginary

d) Can’t be determined

29 / 50

29. When a positively charged particle is brought inside a negatively charged sphere (charge distributed on its surface), the positive charge:

a) Will move toward the surface

b) Will move away from the surface

c) Will remain in its original position

d) Can’t be determined

30 / 50

30. A free test charge placed in an electric field moves in the direction of:

a) Electric flux

b) Electric intensity

c) Electric potential

d) None of these

31 / 50

31. Average voltage stored on a capacitor during charging is:

a) V

b) 2V

c) V/2

d) Can’t be determined

32 / 50

32. Two charges, one 10C and the other -2C, attract each other with a force of 20N. If 2C charge is added to each, what is the new force between them?

a) 40N

b) 48N

c) 480N

d) 0N

33 / 50

33. Which of the following are vector quantities?

a) Electric field

b) Electric flux density

c) Electric flux

d) Both a and b

34 / 50

34. Which type of capacitor allows control of capacitance by changing the relative area?

a) Film capacitor

b) Variable capacitor

c) Electrolytic capacitor

d) Ceramic capacitor

35 / 50

35. Capacitance is measured in:

a) Volt

b) Coulomb

c) Farad

d) None of these

36 / 50

36. Permittivity of a conductor is:

a) Zero

b) Finite

c) Infinite

d) Can’t be determined

37 / 50

37. Two capacitors, each of 3F, are connected in parallel. Three such pairs are connected in series. What is the equivalent capacitance of the system?

a) 3F

b) 6F

c) 2F

d) 9F

38 / 50

38. There are 4 charges: q1 (positive) and q2 (negative) placed inside a metallic sphere; q3 (positive) and q4 (negative) placed outside the sphere. Which charges contribute to calculating flux through the metallic sphere?

a) q1 and q3

b) q1 and q2

c) q3 and q4

d) All q1, q2, q3, and q4

39 / 50

39. Cₘ/C equals:

a) Relative permittivity of the medium

b) Absolute permittivity

c) Permittivity of free space

d) None of these

40 / 50

40. If RC is much greater than 1, then the capacitor is charged:

a) Slowly

b) Quickly

c) May be slow or fast

d) Can’t be determined

41 / 50

41. If potential difference increases, what happens to the energy stored in the capacitor?

a) Increases

b) Decreases

c) Remains the same

d) Can’t be determined

42 / 50

42. How much energy is stored in a 10F capacitor at a potential difference of 2V?

a) 10J

b) 20J

c) 30J

d) 40J

43 / 50

43. ----------- is also called the dielectric constant:

a) Permittivity of space

b) Relative permittivity

c) Both a and b

d) None of these

44 / 50

44. Which property of charges is used for detecting another charge?

a) Attraction

b) Repulsion

c) Both attraction and repulsion

d) Can’t be determined

45 / 50

45. Dielectric material used in a capacitor should be:

a) Conductor

b) Semiconductor

c) Insulator

d) Resistor

46 / 50

46. Two charges A and B are placed 10cm apart. Charge A is 1μC and charge B is 2μC. What is the ratio of force exerted on A to B?

a) 1:2

b) 2:1

c) 1:1

d) None of these

47 / 50

47. If three capacitors, each of 300μF, are connected in parallel, what is the equivalent capacitance?

a) 100μF

b) 300μF

c) 900μF

d) None of these

48 / 50

48. Three capacitors are connected in a triangle shape as shown in the diagram. Which of the following is correct regarding the diagram?

a) Equivalent capacitance between AB and AC is equal

b) Equivalent capacitance between BC and AC is equal

c) Both a and b are correct

d) None of these

49 / 50

49. Three capacitors, each of 1F, are connected as shown in the diagram. What is the equivalent capacitance between A and B?

a) 3F

b) 2F

c) 2F/3

d) 3F/2

50 / 50

50. If the charge stored on a capacitor is doubled, the capacitance:

a) Becomes twice

b) Becomes half

c) Remains the same

d) Can’t be determined

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MDCAT XII Physics Electrostatics Online Test-2

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