Physics MCQ’s From Past Papers

1. What is the relative permittivity of air?
(A) 1.0006
(B) 7.8
(C) 3.7

2. The working principle of the dielectric in the capacitor is …
(A) Electric Polarization
(B) No Charge
(C) Small Charge
(D) Maximum Charge

3. ERG stands for what…?
(A) Electro Retinography
(B) Electro Radiography
(C) Electrography
(D) None of these

4. If air is the dielectric between plates of a capacitor, by doubling the distance between the plates and reducing the area to 1/3 of the original value, its capacitance becomes
(A) 6 times
(B) 90 times
(C) 10 times
(D) 1/6 times

5. NaCl is a __________ dielectric.
(A) Polar
(B) Non-Polar
(C) Electric
(D) Magnetic

6. Initially, when the capacitor is uncharged, the potential difference between plates is
(A) Infinite
(B) Zero
(C) Maximum
(D) Minimum

7. The unit of resistance–capacitance is …
(A) Ohm Farad
(B) Coulomb
(C) Both A & C
(D) Second

8. The unit of the energy density of the capacitor is
(A) Jm²
(B) JF
(C) J/m³
(D) J/F

9. The capacitance of two 5 µF capacitors in series is ______ µF
(A) 25
(B) 2.5
(C) 10
(D) 5

10. The electric field lines will be uniform when placed …
(A) Near a –ve charge
(B) Near a +ve charge
(C) The middle between two positively charged plates
(D) All of these

11. Visual representation of the electric field can be obtained by …
(A) Electric lines of force
(B) Electric flux
(C) Both A & B
(D) Electric field lines

12. How is energy stored in the capacitor?
(A) Magnetic field
(B) Gravitational field
(C) Electric field
(D) All of these