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#1 Class 12 Physics Current Electricity 2019 Short 2M CBSE
Nichrome and Copper wires of same length and same radius are connected in series. Current $I$ is passed through them. Which wire gets heated up more? Justify your answer.
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#2 Class 12 Physics Current Electricity 2018 Short 1M CBSE
Write the expression for the drift velocity of charge carriers in a conductor of length $L$ across which a potential difference $V$ is applied.
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#3 Class 12 Physics Current Electricity 2022 Short 3M CBSE
A coil contains $N$ turns of insulated copper wire of diameter $d$ and resistivity $\rho$ wound on a cylinder of diameter $D$. What is the total resistance between the two ends of the coil? (Given: $D \gg d$)
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#4 Class 12 Physics Current Electricity 2019 Short 2M CBSE
Internal resistance of a cell of emf 12 V is 0.05 $\Omega$. Find the voltage across the cell when a current of 60 A is drawn from it.
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#5 Class 12 Physics Current Electricity 2021 Short 2M CBSE
A battery of 12 V and internal resistance 0.5 $\Omega$ is connected across a variable resistance $R$. Find the value of $R$ for which the power delivered to $R$ is maximum.
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#6 Class 12 Physics Current Electricity 2020 Short 1M CBSE
The $V$-$I$ graphs for a conductor at two different temperatures $T_1$ and $T_2$ are shown in figure. The steeper slope corresponds to $T_1$. Write the relation between $T_1$ and $T_2$.
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#7 Class 12 Physics Current Electricity 2018 Mcq 1M CBSE
If the length of a conductor is halved, then its conductance will be
A. halved
B. doubled
C. quadrupled
D. unchanged
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#8 Class 12 Physics Current Electricity 2017 Mcq 1M CBSE
The internal resistance of a cell is the actual resistance of
A. electrodes of the cell
B. vessel of the cell
C. material used in the cell
D. electrolyte used in the cell
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#9 Class 12 Physics Current Electricity 2019 Mcq 1M CBSE
An energy source will supply a constant current into the load, if its internal resistance is
A. zero
B. equal to load resistance
C. very large compared to load resistance
D. non-zero but less than load resistance
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#10 Class 12 Physics Current Electricity 2018 Short 1M CBSE
If the resistivity of an alloy is $\rho'$ and that of its constituent metal is $\rho$, state the relation between them.
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#11 Class 12 Physics Current Electricity 2020 Short 1M CBSE
Write the relation between drift velocity $v_d$ and applied electric field $E$ of a conductor.
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#12 Class 12 Physics Current Electricity 2019 Mcq 1M CBSE
The algebraic sum of all currents meeting at a point in an electrical circuit is
A. zero
B. infinite
C. positive
D. negative
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#13 Class 12 Physics Current Electricity 2021 Mcq 1M CBSE
If voltage across a lamp increases by 2%, then the increase in its power will be
A. 1%
B. 2%
C. 3%
D. 4%
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#14 Class 12 Physics Current Electricity 2018 Mcq 1M CBSE
Electron-volt (eV) is the measure of
A. charge
B. potential difference
C. current
D. energy
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#15 Class 12 Physics Current Electricity 2017 Mcq 1M CBSE
Wheatstone's bridge is used in measuring
A. High resistance
B. Low resistance
C. Both high and low resistance
D. Potential difference
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#16 Class 12 Physics Current Electricity 2020 Mcq 1M CBSE
A steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantities is constant along the conductor?
A. current
B. drift speed
C. current density
D. none of these
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#17 Class 12 Physics Current Electricity 2019 Mcq 1M CBSE
The net charge on a current carrying conductor is
A. zero
B. constant
C. varying
D. negative
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#18 Class 12 Physics Current Electricity 2018 Mcq 1M CBSE
Kilowatt-hour (kWh) is the unit of
A. energy
B. power
C. torque
D. force
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#19 Class 12 Physics Current Electricity 2017 Mcq 1M CBSE
Beams of electrons and protons move parallel to each other in the same direction. They
A. attract each other
B. repel each other
C. neither attract nor repel
D. force depends upon speed of beams
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#20 Class 12 Physics Current Electricity 2018 Mcq 1M CBSE
Pieces of copper and silicon are initially at room temperature. Both are heated to temperature $T$. The conductivity of
A. both increases
B. both decreases
C. copper increases and silicon decreases
D. copper decreases and silicon increases
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