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Test: EMFs & Internal Resistance - NEET MCQ


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10 Questions MCQ Test Physics Class 12 - Test: EMFs & Internal Resistance

Test: EMFs & Internal Resistance for NEET 2024 is part of Physics Class 12 preparation. The Test: EMFs & Internal Resistance questions and answers have been prepared according to the NEET exam syllabus.The Test: EMFs & Internal Resistance MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: EMFs & Internal Resistance below.
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Test: EMFs & Internal Resistance - Question 1

A car battery has ________ resistance than a dry cell.

Detailed Solution for Test: EMFs & Internal Resistance - Question 1

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.

Test: EMFs & Internal Resistance - Question 2

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

Detailed Solution for Test: EMFs & Internal Resistance - Question 2

The correct option is C

since it requires a current to be observed

 

It can be calculated from current and voltage data measured from a test circuit containing the battery and a load resistor 

Test: EMFs & Internal Resistance - Question 3

Electromotive force is a

Detailed Solution for Test: EMFs & Internal Resistance - Question 3

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.

Test: EMFs & Internal Resistance - Question 4

emf is measured in​

Detailed Solution for Test: EMFs & Internal Resistance - Question 4

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

Test: EMFs & Internal Resistance - Question 5

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

Detailed Solution for Test: EMFs & Internal Resistance - Question 5

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.

Test: EMFs & Internal Resistance - Question 6

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

Detailed Solution for Test: EMFs & Internal Resistance - Question 6

Test: EMFs & Internal Resistance - Question 7

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​

Detailed Solution for Test: EMFs & Internal Resistance - Question 7

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

Test: EMFs & Internal Resistance - Question 8

Current provided by a battery is maximum when

Detailed Solution for Test: EMFs & Internal Resistance - Question 8

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.

Test: EMFs & Internal Resistance - Question 9

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?

Detailed Solution for Test: EMFs & Internal Resistance - Question 9

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

Test: EMFs & Internal Resistance - Question 10

The term open circuit means

Detailed Solution for Test: EMFs & Internal Resistance - Question 10

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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