Electric Current Test

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Electric Current Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

A car battery has ________ resistance than a dry cell.

A
same

B
much lower

C
slightly greater

D
much higher

Solution

a car battery of 12V provides a current of about 200A, which is the current needed to operate a starter motor. So a battery has a very small internal resistance.
also,The cause of non-correctable battery problems and.A weak cell holds less capacity and is discharged more quickly.
Question 2
1 / -0

The internal resistance of a battery cannot be measured with a conventional multimeter

A
since the resistance has a small value

B
since it is not a measurable quantity

C
since it requires a current to be observed

D
since it is a fictitious quantity
Question 3
1 / -0

Electromotive force is a

A
non contact force

B
potential

C
potential difference

D
contact force

Solution

EMF is equal to potential difference between plates when the battery is not connected to any external circuit.
Potential difference is due to the charge accumulation on the plates. So, EMF produces a potential difference between the two terminals which drives the current.
Question 4
1 / -0

emf is measured in

A
J.C

B
J

C
J/C

D
J/C/m

Solution

The unit for electromotive force is Volt.
EMF is numerically expressed as the number of Joules of energy given by the source divided by each Coulomb to enable a unit electric charge to move across the circuit.
Volts=Joules/Coulombs
Question 5
1 / -0

Under what condition, the current drawn from the cell is maximum?

A
R = r

B
R > r

C
R = 0

D
R < r

Solution

The maximum current can be drawn from a cell if the external resistance R = 0.
When current is to be drawn at max then the conducting wire rating comes high such that resistance is less.
Resistance R = rho x l/a
Rho = resistivity constant
L=length
a=area of cross-section
Hence, if the area of cross-section increases resistance decreases by increasing the rate of current to flow.
Question 6
1 / -0

Internal resistance of cell when there is current of 0.40 A when a battery of 6.0 V is connected to a resistor of 13.5 Ω is

A
1.5 Ω

B
2.3 Ω

C
3.5 Ω

D
4.5 Ω

Solution
Question 7
1 / -0

Two terminals of a cell of emf 2.5 V are connected to the two ends of the 10 ohm resistance coil. If the current in the circuit is 0.2 A, then the internal resistance of the cell is

A
2.5 ohm

B
3.2 ohm

C
2 ohm

D
4.5 ohm

Solution

The internal resistance of the cell can be obtained from the relation,
I=ε/R+r
0.2=2.5/(10+r)=2.5ohm
Question 8
1 / -0

Current provided by a battery is maximum when

A
internal resistance is equal to external resistance

B
internal resistance is greater then external resistance

C
internal resistance is less than external resistance

D
none of these

Solution

Current provided by a battery is maximum when internal resistance is equal to external resistance. As a battery discharges, not only does it diminish its internal store of energy, but its internal resistance also increases (as the electrolyte becomes less and less conductive), and its open-circuit cell voltage decreases (as the chemicals become more and more dilute). The most deceptive change that a discharging battery exhibits is increased resistance.
Question 9
1 / -0

What is the maximum current that can be drawn from a cell of emf E and internal resistance r connected to an external resistance R?

A
I = E/(R+r)

B
infinite

C
I = E/R

D
I = E/r

Solution

as the maximum current that can be drawn from a cell is for R =0 therefore, it is I = E/r.
Question 10
1 / -0

The term open circuit means

A
the condition R = r is true

B
the two terminals are directly connected

C
maximum possible current flows in the cell

D
no current flows through the cell

Solution

An open circuit implies that the two terminals are points that are externally disconnected, which is equivalent to a resistance R=∞ . This means that zero current can flow between the two terminals, regardless of any voltage difference.

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Re-Attempt Weekly Quiz Competition

Electric Current Test - 17

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Electric Current Test - 17

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SHARING IS CARING

Question 1

same

much lower

slightly greater

much higher

Solution

Question 2

since the resistance has a small value

since it is not a measurable quantity

since it requires a current to be observed

since it is a fictitious quantity

Question 3

non contact force

potential

potential difference

contact force

Solution

Question 4

J.C

J

J/C

J/C/m

Solution

Question 5

R = r

R > r

R = 0

R < r

Solution

Question 6

1.5 Ω

2.3 Ω

3.5 Ω

4.5 Ω

Solution

Question 7

2.5 ohm

3.2 ohm

2 ohm

4.5 ohm

Solution

Question 8

internal resistance is equal to external resistance

internal resistance is greater then external resistance

internal resistance is less than external resistance

none of these

Solution

Question 9

I = E/(R+r)

infinite

I = E/R

I = E/r

Solution

Question 10

the condition R = r is true

the two terminals are directly connected

maximum possible current flows in the cell

no current flows through the cell

Solution

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