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Current Electricity - 04
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Q1. EMF of a cell is
*
1 point
the potential difference between the positive and negative terminal of a cell in a closed circuit
less than terminal potential difference of the cell
the force required to push the electrons in the circuit
the maximum potential difference between the terminals of a cell when no current is drawn from the cell
Q2. When potential difference is applied across an electrolyte, then Ohm’s law is obeyed at
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1 point
zero potential
negative potential
very low potential
High potential
Q3. To draw a maximum current from a combination of cells, how should the cells be grouped?
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1 point
Parallel
Mixed grouping
Series
Depends upon the relative values of internal and external resistances.
Q4. Under what condition will the strength of current in a wire of resistance R be the same for connection is series and in parallel of n identical cells each of the internal resistance r? When
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1 point
a
b
c
d
Q5. A cell of internal resistance r is connected to an external resistance R. The current will be maximum in R, if
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1 point
R = r
R = r/2
R < r
R > r
Q6. An energy source will supply a constant current into the load if its internal resistance is
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1 point
zero
equal to the resistance of the load
very large as compared to the load resistance
non-zero but less than the resistance of the load
Q7. The resistance of the coil of an ammeter is R. The shunt required to increase its range n-fold should have a resistance
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1 point
a
b
c
d
Q8. A cell of internal resistance r is connected across an external resistance nr. Then the ratio of the terminal voltage to the emf of the cell is
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1 point
a
b
c
d
Q9. If n cells each of emf ε and internal resistance r are connected in parallel, then the total emf and internal resistances will be
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1 point
a
c
b
d
Q10. The internal resistance of dry cell is ...A..., than the internal resistance of common electrolytic cell. Here, A refers to
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1 point
much lower
much higher
slightly lower
slightly higher
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