Current Electricity Additional Practice Test

12th Standard Physics — Current Electricity: Additional Online Practice Test

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Which of the following physical quantities is defined as the rate of flow of electric charges through a given cross-sectional area?

A.Electric potential B.Electric current C.Electrical resistance D.Electromotive force

By convention, the direction of conventional current in an external circuit is taken to be from:

A.The negative terminal to the positive terminal B.The direction of electron flow C.The positive terminal to the negative terminal D.Low potential to high potential

The average velocity acquired by electrons inside a conductor when subjected to an external electric field is called:

A.Terminal velocity B.Angular velocity C.Drift velocity D.RMS velocity

In the microscopic model of current, the relationship between current (\(I\)) and drift velocity (\(v_d\)) is given by:

A.\(I = neAv_d\) B.\(I = nAv_d / e\) C.\(I = n e / Av_d\) D.\(I = v_d / neA\)

Which of the following describes a device that does not follow a linear relationship between current and voltage?

A.Ohmic conductor B.Copper wire C.Non-ohmic device D.Carbon resistor

Electrical resistivity is defined as the resistance offered by a conductor of:

A.Unit length and any area B.Unit area and any length C.Unit length and unit area of cross section D.Infinite length and zero area

If a carbon resistor has color bands Green, Blue, Orange, and Gold, what is its resistance value?

A.\(56 \Omega \pm 5\%\) B.\(5.6 k\Omega \pm 10\%\) C.\(56 k\Omega \pm 5\%\) D.\(560 k\Omega \pm 20\%\)

Three resistors of \(R_1\), \(R_2\), and \(R_3\) are connected in parallel. The equivalent resistance \(R_P\) is given by:

A.\(R_P = R_1 + R_2 + R_3\) B.\(1/R_P = 1/R_1 + 1/R_2 + 1/R_3\) C.\(R_P = (R_1 R_2 R_3) / (R_1 + R_2 + R_3)\) D.\(R_P = \sqrt{R_1^2 + R_2^2 + R_3^2}\)

An ideal battery is defined as a source of electromotive force (emf) that has:

A.Infinite internal resistance B.Zero internal resistance C.Internal resistance equal to load resistance D.Varying emf with current

Q10

Kirchhoff's Current Rule (First Rule) states that the algebraic sum of currents at any junction in a circuit is:

A.Infinite B.Equal to the source voltage C.Zero D.Equal to the total resistance

Q11

In a Wheatstone's bridge, the bridge is said to be balanced when the current through the galvanometer is:

A.Maximum B.Zero C.Equal to the source current D.Half of the source current

Q12

A meter bridge is primarily used to measure:

A.Unknown electromotive force B.Unknown resistance C.Specific heat of wire D.Internal resistance of a cell

Q13

The principle of a potentiometer states that the potential difference across any length of a wire of uniform cross-section is:

A.Inversely proportional to its length B.Directly proportional to its length C.Constant regardless of length D.Equal to the internal resistance

Q14

According to Joule's law of heating, the heat produced (\(H\)) in a resistor is proportional to:

A.The current (\(I\)) B.The square of the current (\(I^2\)) C.The inverse of resistance (\(1/R\)) D.The square root of time (\(\sqrt{t}\))

Q15

The phenomenon in which an electric current is produced in a circuit of two dissimilar metals by maintaining their junctions at different temperatures is:

A.Peltier effect B.Seebeck effect C.Thomson effect D.Joule effect

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About this Current Electricity test

This free online practice test covers Current Electricity from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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