ELECTRICITY --------------- --------------- --------------- --- 1.Which one is a property of a material? a resistivity. b current c resistance d e.m.f 2. Which one of the following quantities is analogous to temperature in electricity? a potential difference b resistance c current d charge 3.Which one of the ‘following is the best matérial for making standard resistance wire? a constantan b copper c tungsten d steel 4. Resistance of a conductor increases with the rise of temperature of a conductor. This is due to a decrease of drift velocity of free electrons. b increase of electron density. c increase of number of free electrons per unit volume. d decrease. of pal 5.The resistance of a wire is R ohm. If the wire Is stretched to double its length, its resistance will become? a 2R b R/2 c R/4 d 4R 6.If a resistor is connected through a negligible lead to a battery as, then: a The same current will flow from negative to positive terminal b Current flow through the resistor from b to a” c Both A & C d V1 > V2 7. The current through a metallic conductor is due to the motion of: a Protons b Electrons c Neutrons d Free electrons 8. In gases the carriers of electricity are a Electrons b Protons c Neutrons d Ions 9. The carriers of electricity in solids are: a + ve ions. b Protons c Electrons d - ve ions 10. In liquids and gases, the current is due to the motion of a Negative charges b Positive charges• c Both negative and positive charges d None of the above 11. According to ohms law: a Current is proportional to potential difference b Potential difference is proportional to resistance c Both A & B d None of the above 12. In a series combinational circuit the amount of current will be: a Half of the original current b . Decreases with flow c Equal in all parts of circuits d Noneof the above
Posted on: Mon, 21 Jul 2014 09:21:05 +0000
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