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Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 7 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. Resultant force on a charge is the ..... sum of the individual forces on that charge.

Correct Answer: B) Vector.

2. Which sentence best describes electrical conductors?

Correct Answer: C) Electrical conductors have electric charges that move freely.

3. In the absence of other conductors, the surface charge density

Correct Answer: C) Directly proportional to the charge and inversely proportional to the surface area.

4. The basic cause of quantisation of electric charge is that during rubbing only an integral number of electrons can be transferred from one body to another.

Correct Answer: A) True.

5. Quantization of charge can be neglected at macroscopic level.

Correct Answer: A) True.

6. What is meant by the expression action at a distance?

Correct Answer: A) The idea that things not in contact can still exert forces on one another.

7. A point charge is placed at the center of a spherical balloon. The electric flux emerging from the balloon is:

Correct Answer: B) $\frac{q}{\epsilon_0}$.

8. Two like charged particles are held in place near each other. When the particles are released, what will most likely happen?

Correct Answer: B) They will accelerate away from each other.

9. What is the direction of the electric field for a negative charge?

Correct Answer: D) Radially inward.

10. A small metal ball is suspended in a uniform electric field with the help of an insulated thread. If high energy X-ray beam falls on:

Correct Answer: A) The ball will be deflected in the direction of field.

11. Two equal and opposite charges separated by a small distance constitute a dipole.If q is the charge and 2l is the distance between the charges, then the dipole moment is, .....

Correct Answer: B) P = 2l * q.

12. When two objects have opposite charge (+ and-), they are:

Correct Answer: A) Attracted to each other.

13. Definition of dielectric constant of a medium in terms of force is

Correct Answer: A) $\frac{F_{vac}}{F_{med}}$.

14. The electric force between two charges changes, if we bring a third charge closer to them.

Correct Answer: B) False.

15. An electric di-pole of moment $\overrightarrow{p}$ $\overrightarrow{E}$

Correct Answer: B) $\overrightarrow{p}\times\\overrightarrow{E}$.

16. Two spheres carrying charge q are hanging from a same point of suspension with the help of threads of length 1 m, in a space free from gravity. The distance between them will be .....

Correct Answer: C) 2.0 m.

17. Two identical conducting balls A and B have charges-Q and +3Q respectively. They are brought in contact with each other and then separated by a distance d apart. Find the nature of the Coulomb force between them

Correct Answer: B) Repulsive.

18. Electric field lines form:-

Correct Answer: A) Open loop.

19. Electric dipole moment is a ..... quantity.

Correct Answer: C) Vector.

20. What is the relationship between electric field and potential difference?

Correct Answer: A) Directly proportional.

21. Which statement is true about both magnetic and electric fields?

Correct Answer: A) Like charges repel each other.

22. What is the dielectric constant of a metal?

Correct Answer: A) Infinity.

23. Which of the following statements is true about electric field lines?

Correct Answer: B) They start from positive charges and end on negative charges.

24. Electrical forces are .....

Correct Answer: A) Invisible.

25. When objects have equal numbers of positive and negative charges, they are

Correct Answer: C) Electrically neutral.

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