Chapter 3: Current Electricity MCQs | physics Class 12 CBSE

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Chapter 3: Current Electricity MCQs | physics Class 12 CBSE | ByteNotes.in

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Question 1

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Electric current through a cross-section of a conductor is defined as

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Question 2

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Which of the following correctly relates the drift velocity vd to the electric field E in a metallic conductor (symbols have standard meanings)?

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Question 3

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The SI unit of resistivity is

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Question 4

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If the length of a wire is doubled and its cross-sectional area is halved, its resistance becomes

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Question 5

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The conductivity σ of a material in terms of electron density n, electron charge e, relaxation time τ, and electron mass m is

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Question 6

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In a metallic conductor, as temperature increases, resistivity increases because

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Question 7

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The resistivity of a semiconductor as temperature increases

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Question 8

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Which of the following materials is most suitable for making a standard (precision) wire-wound resistor?

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Question 9

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The terminal voltage of a cell of EMF ε and internal resistance r when delivering current I is

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Question 10

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The maximum current that can be drawn from a cell of EMF ε and internal resistance r is

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Question 11

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Two cells of EMF ε₁ and ε₂ with internal resistances r₁ and r₂ are connected in series aiding. The equivalent internal resistance is

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Question 12

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Two cells of EMF ε₁ and ε₂ with internal resistances r₁ and r₂ are connected in parallel. The equivalent EMF is

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Question 13

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Kirchhoff's junction rule is a consequence of

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Question 14

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Kirchhoff's loop rule is a consequence of

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Question 15

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The balance condition for a Wheatstone bridge with arms R₁, R₂, R₃, R₄ is

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Question 16

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Power dissipated in a resistor R carrying current I is

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Question 17

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The power wasted in transmission cables of resistance Rc when transmitting power P at voltage V is

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Question 18

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The mobility μ of charge carriers is defined as

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Question 19

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The SI unit of mobility of charge carriers is

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Question 20

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In the absence of an electric field, the average velocity of conduction electrons in a metal is

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Chapter 3: Current Electricity | MCQs

Electric current through a cross-section of a conductor is defined as

Which of the following correctly relates the drift velocity vd to the electric field E in a metallic conductor (symbols have standard meanings)?

The SI unit of resistivity is

If the length of a wire is doubled and its cross-sectional area is halved, its resistance becomes

The conductivity σ of a material in terms of electron density n, electron charge e, relaxation time τ, and electron mass m is

In a metallic conductor, as temperature increases, resistivity increases because

The resistivity of a semiconductor as temperature increases

Which of the following materials is most suitable for making a standard (precision) wire-wound resistor?

The terminal voltage of a cell of EMF ε and internal resistance r when delivering current I is

The maximum current that can be drawn from a cell of EMF ε and internal resistance r is

Two cells of EMF ε₁ and ε₂ with internal resistances r₁ and r₂ are connected in series aiding. The equivalent internal resistance is

Two cells of EMF ε₁ and ε₂ with internal resistances r₁ and r₂ are connected in parallel. The equivalent EMF is

Kirchhoff's junction rule is a consequence of

Kirchhoff's loop rule is a consequence of

The balance condition for a Wheatstone bridge with arms R₁, R₂, R₃, R₄ is

Power dissipated in a resistor R carrying current I is

The power wasted in transmission cables of resistance Rc when transmitting power P at voltage V is

The mobility μ of charge carriers is defined as

The SI unit of mobility of charge carriers is

In the absence of an electric field, the average velocity of conduction electrons in a metal is

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