General Science MCQ – 154 (Physics)

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

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) Electroretinography
(B) Electro radiography
(C) Electrography
(D) All of the above

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) 9 times
(C) 10 times
(D) 1/6 times

5. NaCl is ________ 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 and B
(D) None of the above

8. The unit of the energy density of the capacitor is?
(A) jm^2
(B) JF
(C) J/m^3
(D) j/F

9. The capacitance of two 5µF 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 the above

General Science MCQ – 153 (Chemistry)