Practice Test: Question Set - 08
1. Which of the following material has least value of dielectric constant?
- (A) Ceramics
- (B) Oil
- (C) Glass
- (D) Paper
2. The time constant and R-C circuit may also be defined as the time during which the charging current falls to _________ percent of its initial maximum value,
- (A) 37
- (B) 42
- (C) 63
- (D) 73
3. A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is
- (A) 50 joules
- (B) 150 joules
- (C) 200 joules
- (D) 250 joules
4. A capacitor consists of
- (A) Two insulators separated by a conductor
- (B) Two conductors separated by an insulator
- (C) Two insulators only
- (D) Two conductors only
5. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them
- (A) All in series
- (B) All in parallel
- (C) Two in parallel and third in series with
this combination
- (D) Two in series and third in parallel across
this combination
6. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is
- (A) 0.024 F
- (B) 0.12 F
- (C) 0.6 F
- (D) 0.8 F
7. The force between two charges is 120 N. If the distance between the charges is doubled, the force will be
- (A) 60 N
- (B) 30 N
- (C) 40 N
- (D) 15 N
8. Which of the following expression is correct for electric field strength?
- (A) E = D/E
- (B) E = D2/t
- (C) E = jtD
- (D) E= nD2
9. A capacitor charged to 200 V has 2000 iC of charge. The value of capacitance will be
- (A) 10 F
- (B) 10 uF
- (C) 100 uF
- (D) 1000 uF
10. The electrostatic force between two charges of one coulomb each and placed at a distance of 0.5 m will be
- (A) 36 × 10 N
- (B) 36 × 107 N
- (C) 36 × 108 N
- (D) 36 × 109 N
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