Government Boys Inter College Ormara

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) 6.25×10^-18	(b) 6.25×10¹⁸
(c) 6.25×10^-19	(d) 6.25×10¹⁹
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) E ∝r	(b) E ∝1/r
(c) E ∝1/r²	(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)1.6×10^-22 J	(b) 1.6×10^-20 J
(c) 1.6×10^-19 J	(d) 1.6×10^-16 J
15. The unit of surface charge density is
(a) cm	(b) C m^-1
(c) C m²	(d) C m^-2
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	(d) Increase
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