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Current Electricity

Physics
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Kirchoffs law of junctions is also called the law of conservation of:

A
Energy
B
Charge
C
Momentum
D
Angular momentum
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In comparing e.m.f.s of 2 cells with the help of potentiometer, at the balance point, the current flowing through the wire is taken from:

A
1) Any one of these cells
B
2) both of these cells
C
3) Battery in the main circuit
D
4) From an unknown source
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A steady current is passing through a linear conductor of non uniform cross-section.  The net quantity of charge crossing any cross section per second is

A
Independent of area of cross-section
B
Directly proportional to the length of the conductor
C
Directly proportional to the area of cross section.
D
Inversely proportional to the length of the conductor
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Assertion(A) : The e.m.f of the cell in secondary circuit must be less than e.m.f of cell in primary circuit in potentiometer.
Reason (R): Balancing length cannot be more than length of potentiometer wire.

A
Both A & R are true and R is the correct explanation of A
B
Both A & R are true and R is not a correct explanation of A
C
A is true but R is false
D
A is false but R is true
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Choose the correct statement:

A
The potential difference between the terminals of a cell in closed circuit is called EMF of the cell.
B
Electromotive force and accelerating force have the same dimensions.
C
The internal resistance of an ideal cell is infinity.
D
The difference between the emf of a cell and potential difference across the ends of the cell is called lost volts.
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For a chosen non-zero value of voltage, there can be more than one value of current in:

A
Copper wire
B
Thermistor
C
nichrome wire
D
Manganine wire
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