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Previous Year Questions

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Board, class, subject, chapter, year-wise PYQ. Practice effectively and ace your board exams.

1,573 Questions
CBSE
#1 Class Class 12 Physics Current Electricity 2021 Short 2M
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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CBSE
#2 Class Class 12 Physics Current Electricity 2020 Short 1M
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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CBSE
#3 Class Class 12 Physics Current Electricity 2018 Mcq 1M
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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CBSE
#4 Class Class 12 Physics Current Electricity 2017 Mcq 1M
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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CBSE
#5 Class Class 12 Physics Current Electricity 2019 Mcq 1M
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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CBSE
#6 Class Class 12 Physics Current Electricity 2018 Short 1M
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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CBSE
#7 Class Class 12 Physics Current Electricity 2020 Short 1M
Write the relation between drift velocity $v_d$ and applied electric field $E$ of a conductor.
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CBSE
#8 Class Class 12 Physics Current Electricity 2019 Mcq 1M
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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CBSE
#9 Class Class 12 Physics Current Electricity 2021 Mcq 1M
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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CBSE
#10 Class Class 12 Physics Current Electricity 2018 Mcq 1M
Electron-volt (eV) is the measure of
A. charge
B. potential difference
C. current
D. energy
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CBSE
#11 Class Class 12 Physics Current Electricity 2017 Mcq 1M
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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CBSE
#12 Class Class 12 Physics Current Electricity 2020 Mcq 1M
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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CBSE
#13 Class Class 12 Physics Current Electricity 2019 Mcq 1M
The net charge on a current carrying conductor is
A. zero
B. constant
C. varying
D. negative
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CBSE
#14 Class Class 12 Physics Current Electricity 2018 Mcq 1M
Kilowatt-hour (kWh) is the unit of
A. energy
B. power
C. torque
D. force
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CBSE
#15 Class Class 12 Physics Current Electricity 2017 Mcq 1M
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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CBSE
#16 Class Class 12 Physics Current Electricity 2018 Mcq 1M
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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CBSE
#17 Class Class 12 Physics Current Electricity 2019 Short 2M
A cell of emf $E$ is connected across an external resistance $R$. When current $I$ is drawn from the cell, the potential difference across the electrodes drops to $V$. Write the expression for the internal resistance $r$ of the cell.
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CBSE
#18 Class Class 12 Physics Current Electricity 2020 Mcq 1M
A current of 0.8 A flows in a conductor of 40 $\Omega$ for 1 minute. The heat produced in the conductor will be
A. 1445 J
B. 1536 J
C. 1569 J
D. 1640 J
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CBSE
#19 Class Class 12 Physics Electric Potential & Capacitance 2023 Short 5M
Twenty seven spherical drops of radius 3 mm and carrying 10⁻¹² C of charge each are combined to form a single drop. Find the capacitance and potential of the bigger drop.
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CBSE
#20 Class Class 12 Physics Electric Potential & Capacitance 2024 Short 5M
An electric dipole of length 2 cm is placed with its axis making 30° to a uniform electric field of 10⁵ N/C. It experiences a torque of 10√3 N·m. Find (i) magnitude of charge on dipole and (ii) potential energy of the dipole.
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