Choose the most appropriate option.
1. The electrostatic force between two point charges is independent of one of the following quantities | |
(a) Magnitude of charges | (b) Temperature of the charges |
(c) Distance between charges | (d) Medium between charges |
2. If the distance between two equal charges is reduced to half and the magnitude of charges is also decreased to half, then the force between them will be | |
(a) Remain same | (b) Decreased to half |
(c) Increased to double | (d) Becomes four time |
3. The concept of electric field was introduced by | |
(a) Coulomb | (b) Faraday |
(c) Gauss | (d) Ampere |
4. The number of electrons or protons which constitutes a charge of one coulomb is | |
(a) | (b) 6.25×1018 |
(c) | (d) |
5. For static electricity the value of relative permittivity is always | |
(a) Zero | (b) Less than one |
(c) Equal to one | (d) Greater than one |
6. Field inside the sphere will be A metallic charged sphere is placed in uniform electric field E, the electric | |
(a) E | (b) Less than E |
(c) Greater than E | (d) zero |
7. The electric intensity E at a point in a field due to a dipole depends upon distance ‘r’ the relationship between them is | |
(a) | (b) |
(c) | (d) E ∝1/r3 |
8. The dipole moment is defined as the product of | |
(a) Charge and distance | (b) Charge and displacement |
(c) Charge and force | (d) Charge and electric field |
9. Debye is the unit of | |
(a) Electric field | (b) Electric charge |
(c) Lines of force | (d) Dipole moment |
10. The electric flux is maximum when angle ‘θ’ between area vector and electric intensity is | |
(a) 0° | (b) 45° |
(c) 60° | (d) 90° |
11. Electric flux is independent of one of the following quantities | |
(a) Charge | (b) Medium |
(c) Field | (d) Distance |
12. The dimension of an electric potential is same as that of | |
(a) Work | (b) Work per unit charge |
(c) Electric field per unit charge | (d) Electric force per unit charge |
13. Electron volt is the unit of | |
(a) Energy | (b) Charge |
(c) Current | (d) Electric Potential |
14. The energy of an electron which accelerates through a potential difference of 1000V is | |
(a) | (b) |
(c) | (d) |
15. The unit of surface charge density is | |
(a) cm | (b) C m-1 |
(c) | (d) |
16. Capacitance of a capacitor does not depend upon | |
(a) Area of plate | (b) Distance between plates |
(c) Medium between plates | (d) Material of the plates |
17. In the presence of dielectric material, the electric field between the plates of the capacitor will be | |
(a) Zero | (b) Remain same |
(c) Decrease | (d) Increase |
18. When the potential difference across the capacitor is decreased by dielectric Then the capacitance of the capacitor will be | |
(a) Zero | (b) Remain same |
(c) Decrease | |
19. The unit of product of resistance and capacitance is equal to unit of | |
(a) Time | (b) Work |
(c) Potential difference | (d) Current |
20. A capacitor is approximately full charged after | |
(a) Two time constant | (b) Three time constant |
(c) Four time constant | (d) Five time constant |
Answers
1. (b) Temperature of the charges
2. (c) Increased to double
3. (b) Faraday
4. (b) 6.25×1018
5. (d) Greater than one
6. (d) zero
7. (d) E ∝1/r3
8. (b) Charge and displacement
9. (d) Dipole moment
10. (a) 0°
11. (d) Distance
12. (b) Work per unit charge
13. (a) Energy
14. (d) 1.6×10-16 J
15. (d) C m-2
16. (d) Material of the plates
17. (c) Decrease
18. (d) Increase
19. (a)Time
20. (d) Five time constant
