1. The unit of absolute permittivity of a medium is
(a) joule/coulomb
(b) newton-metre
(c) farad/metere
(d) farad/coulomb
2. If relative permittivity of mica is 5, its absolute permittivity is
(a) 5 ฮต0 (b) 5/ฮต0
(c) ฮต0/5 (d) 8.854 ร 10โ12
3. Two similar electric charges of 1 C each are placed 1 m apart in air. Force of repulsion between them would be nearly…… newton
(a) 1
(b) 9 ร 109
(c) 4 ฯ
(d) 8.854 ร 10โ12
4. Electric flux emanating from an electric charge of + Q coulomb is
(a) Q/ฮต0 (b) Q/ฮตr
(c) Q/ฮต0ฮตr (d) Q
5. The unit of electric intensity is
(a) joule/coulomb
(b) newton/coulomb
(c) volt/metre
(d) both (b) and (c)
6. If D is the electric flux density, then value of electric intensity in air is
(a) D/ฮต0 (b) D/ฮต0ฮตr
(c) dV/dt (d) Q/ฮตA
7. For any medium, electric flux density D is related to electric intensity E by the equation
(a) D = ฮต0 E (b) D = ฮต0ฮตr E
(c) D = E/ฮต0ฮตr (d) D = ฮต0E/ฮตr
8. Inside a conducting sphere,…remains constant
(a) electric flux
(b) electric intensity
(c) charge
(d) potential
9. The SI unit of electric intensity is
(a) N/m
(b) V/m
(c) N/C
(d) either (b) or (c)
10. According to Gaussโs theorem, the surface integral of the normal component of electric flux density D over a closed surface containing charge Q is
(a) Q (b) Q/ฮต0
(c) ฮต0 Q (d) Q2/ฮต0
11. Which of the following is zero inside a charged conducting sphere ?
(a) potential
(b) electric intensity
(c) both (a) and (b)
(d) both (b) and (c)
12. In practice, earth is chosen as a place of zero electric potential because it
(a) is non-conducting
(b) is easily available
(c) keeps lossing and gaining electric
charge every day
(d) has almost constant potential.
ANSWERS
1. c 2. a 3. b 4. d 5. d 6. a
7. b 8. d 9. d 10. a 11. c 12. d
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