Chapter : Current Electricity Electric Current - 1 1. The rate of flow of charge in a circuit is called (A) Electric Potential (B) Electric Current (C) Electric Field (D) All of these 2. Which of the following is not a unit of charge : (A) Coulomb (B) Ampere-second (C) Ampere/second (D) Microcoulomb 3. Ampere-second stands for the unit of : (A) power (B) charge (C) potential (D) energy 4. An electric current of 5A is the same as : (A) 5 JC –1 (B) 5 VC –1 (C) 5 Cs–1 (D) 5 Js–1 5. The electric current is expressed in : (A) Volt (C) Coulomb/second (B) Ampere (D) B & C both are correct 6. – If electrons are flowing from A to B then the correct statement is : A B (A) A is at higher potential than B (B) B is at higher potential than A (C) Both are at same potential (D) Can’t say anything + 7. A flow of 105 electron per second in a conducting wire constitutes a current of : (A) 1.6 × 10–24 A (B) 1.6 × 1024 A (C) 1.6 × 10–14 A (D) 1.6 × 1010 A 8. Current of 4.8 ampere is flowing through a conductor. Then the number of electrons flowing per second through it will be : (A) 3 × 1019 (B) 6 × 1021 (C) 6 × 1020 (D) 3 × 1020 9. If I is the current through a wire and e is the charge of electron, then the number of electrons passing through it cross section in t seonds will be given by: 10. Ie (B) Ite t Value of Current i in the following circuit is : (A) (C) 1. (B) 2. (C) 3. (B) It e i 6A (B) 12 A (D) 1A 10A (A) 13 A e It 2A (C) 9 A ANSWER KEY Physics (Electric Current - 1) 4. (C) 5. (D) 6. (B) 7. (C) (D) none of the above 8. (A) 9. (D) 10. (A) Page # 1