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Current Electricity - 05
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Q1. Kirchoff’s first law, i.e., S i = 0 at a junction, deals with the conservation of
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momentum
energy
charge
angular momentum
Q2. The Kirchhoff's second law (ΣiR = ΣE), where the symbols have their usual meanings, is based on
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conservation of charge
conservation of potential
conservation of energy
conservation of momentum
Q3. Why is the Wheatstone bridge better than the other methods of measuring resistances?
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It is based on Kirchoff’s law
It does not involve Ohm’s law
It has four resistor arms
It is a null method
Q4. If in the experiment of Wheatstone’s bridge, the positions of cells and galvanometer are interchanged, then balance point will
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remain unchanged
change
None of them
depend on the internal resistance of cell and resistance of galvanometer
Q5. In a wheatstone bridge in the battery and galvanometer are interchanged then the deflection in galvanometer will
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change in opposite direction
not change
change in previous direction
none of the
Q6. In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistance are interchanged. The error so removed is
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random error
index error
due to temperature effect
end correction
Q7. Potentiometer is based on
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(a) deflection method
(b) zero deflection method
(c) both (a) and (b)
(d) None of them
Q8. In the experiment of potentiometer, at balance point, there is no current in the
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main circuit
galvanometer circuit
potentiometer circuit
both main and galvanometer circuits
Q9. Sensitivity of potentiometer can be increased by
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increasing the e.m.f of the cell
None of them
decreasing the length of the potentiometer wire
increasing the length of the potentiometer
Q10. Potentiometer measures potential more accurately because
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it measures potential in open circuit
it uses sensitive galvanometer for null deflection
it uses high resistance potentiometer wire
it measures potential in closed circuit
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