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Current electricity

11. The condition for the validity under Ohm’s law is that

[amp_mcq option1=”Resistance must be uniform” option2=”Current should be proportional to the size of the resistance” option3=”Resistance must be wire wound type” option4=”Temperature at positive end should be more than the temperature at negative end” correct=”option1″]

Detailed SolutionThe condition for the validity under Ohm’s law is that

12. When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is

[amp_mcq option1=”A.C.” option2=”D.” option3=”B.” option4=”None of the above” correct=”option1″]

Detailed SolutionWhen electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is

13. Resistance of carbon filament lamp as the applied voltage increases.

[amp_mcq option1=”Increases” option2=”Decreases” option3=”Remains same” option4=”None of the above” correct=”option1″]

Detailed SolutionResistance of carbon filament lamp as the applied voltage increases.

14. Voltage dependent resistors are usually made from

[amp_mcq option1=”Charcoal” option2=”Silicon carbide” option3=”Nichrome” option4=”Graphite” correct=”option2″]

Detailed SolutionVoltage dependent resistors are usually made from

15. Which is the best conductor of electricity?

[amp_mcq option1=”Iron” option2=”Silver” option3=”Copper” option4=”Carbon” correct=”option1″]

Detailed SolutionWhich is the best conductor of electricity?

16. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?

[amp_mcq option1=”18 ohms” option2=”36 ohms” option3=”48 ohms” option4=”64 ohms” correct=”option2″]

Detailed SolutionThe resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?

17. Conductance: mho ::

[amp_mcq option1=”Resistance : ohm” option2=”Capacitance : Henry” option3=”Inductance : farad” option4=”lumen : steradian” correct=”option1″]

Detailed SolutionConductance: mho ::

18. When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is

[amp_mcq option1=”1 n-mho” option2=”106 mho” option3=”1 milli-mho” option4=”None of the above” correct=”option1″]

Detailed SolutionWhen a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is

19. Which of the following material has nearly zero temperature coefficient of resistance?

[amp_mcq option1=”Manganin” option2=”Porcelain” option3=”Carbon” option4=”Copper” correct=”option1″]

Detailed SolutionWhich of the following material has nearly zero temperature coefficient of resistance?

20. The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature coefficient of the filament is

[amp_mcq option1=”Zero” option2=”Negative” option3=”Positive” option4=”About 2 ohms per degree” correct=”option3″]

Detailed SolutionThe hot resistance of the bulb’s filament is higher than its cold resistance because the temperature coefficient of the filament is

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