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Class XII Physics Important Questions on Current Electricity
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Question 1
Which of the following statements is false?
Question 2
A potentiometer PQ is set up to compare two resistances as shown in the figure. The ammeter A in the circuit reads 1.0 A when two way key K3 is open. The balance point is at a length l1 cm from P when two way key K3 is plugged in between 2 and 1, while the balance point is at a length l2 cm from P when key K3 is plugged in between 3and 1. The ratio of two resistances
, is found to be:
, is found to be: Question 3
A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold, then, an electric current will
Question 4
The gap between the plates of a parallel plate capacitor is filled with glass of resistivity ï. The capacitance of the capacitor without glass equals C. The leakage current through the capacitor when a voltage V is applied across it is
Question 5
The temperature dependence of resistance of Cu and undoped Si in the temperature range 300K – 400K, is best described by
Question 6
Two conductors have the same resistance a 0 ºC but their temperature coefficients of resistance are α1 and α2. The respectively temperature coefficients of their series an parallel combinations are nearly
Question 7
In the circuit shown, the resistance r is a variable resistance. If for r = f R, the heat generation in r is maximum then the value of f is: 
Question 8
In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R (in Ω) will be 
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Nov 18JEE & BITSAT
