### Chapter 16 - Current & Electricity - 2 1. The unit of potential difference is known as a) Volt b) Ohm c) Farad d) Ampere 2. As the length of conductor increases, its resistance a) Decreases b) Does not change c) Increases d) Some time change 3. The unit of power is known as a) Joule b) Volt c) Watt d) Farad 4. Methematically satement of Ohms law is given as. a) R=V x I b) V=IR c) V=I^2R d) I=VR 5. 2 Ohm and 3 Ohm resistors are connected in sereis its equivalent resistance a) 2.5 Ohm b) 5 Ohm c) 6 Ohm d) 4 Ohm 6. The length of a copper wire is 1 meter and its diameter is 2 mm. Its resistance is as a) 4.5m ohm b) 3.6m ohm c) 5.4m ohm d) 4.9m ohm 7. The specific resistance of platinum is as a) 1.62 x 10-6 ohm m b) 3.5 x 10-5 ohm m c) 10.6 x 10-8 ohm m d) 2.75 x 10-8 ohm m 8. In SI system unit of resistance is a) Volt b) Ohm c) Columb d) Farad 9. The mathemetical statement of joul's law is written as a) W=V/q b) Q=WV c) W=Q2V d) W=QV 10. As the temprature of a conductor rises, its resistance a) Does not change b) Decreases c) Increases d) Some time decrease 11. 1 mega Ohm is equal to a) 1 x 104 ohm b) 1 x 105 ohm c) 1 x 106 ohm d) 1 x 103 ohm 12. Ohm meter is used for measuring the a) Energy b) Resistance c) Potential difference d) Current 13. The unit of electric charge is a) Coulomb b) Joul c) Ampere d) Farad 14. If the resistance of conductor is 5 ohm and potential difference is 10 volt. Then current is as a) 2.5 A b) 50 A c) 1.5 A d) 2 A 15. A platinum resistance thermometer can measure the temperature from a) -250 degree C to 530 degree C b) -100 degree C to 630 degree C c) 0 degree C to 250 degree C d) -260 degree C to 630 degree C

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