Current Electricity Objective Conversion physics questions with solutions

Showing 1–10 of 30 questions

• MCQdifficultCurrent electricityEquivalent Resistance & Networks

  In the circuit shown in figure, find the equivalent resistance across points A and B.

  

  Options

  • Option A

    5R/4

  • Option B

    2R/5

  • Option C

    3R/2

  • Option D

    R/2

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• MCQeasyCurrent electricityCells, Maximum Power & Heating Effect

  A metallic wire has variable cross sectional area. Cross sectional area at cd is twice the area at ab. The wire is connected to a cell as shown. Find the ratio of heat dissipated per unit volume at section cd to that at section ab.

  

  Options

  • Option A

    1/4

  • Option B

    1/2

  • Option C

    2

  • Option D

    4

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• NumericmediumCapacitorRC circuit

  In the circuit shown, after the switch is shifted to position 2 the heat generated in 50 Ω resistance is 6 J. Find the emf (V) of the cell.

  

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• Multi-correctdifficultCurrent electricityElectric Current, Drift Velocity & Resistance

  An electric bulb has a solid cylindrical filament of length l and radius r and it consumes power P when connected to a power source. Another bulb having cylindrical filament of same material, operating at same voltage and emitting the same spectrum of light consumes 8P power. Find length and radius of the new filament. Assume that the filaments do not radiate from the flat ends and radiation is the only source of heat loss from the filaments.

  Select all that apply

  • Option A

    New radius = 2r

  • Option B

    New radius = 4r

  • Option C

    New length = 2l

  • Option D

    New length = l/2

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• Multi-correctmediumCurrent electricityCircuit Theory & Kirchhoff’s Laws

  In the circuit shown the switch is closed at time t = 0 then

  

  Select all that apply

  • Option A

    I = (V₀/R)$e^(-t/RC)$

  • Option B

    V꜀ = V₀(1-$e^(-t/RC))$

  • Option C

    Power absorbed by capacitor = (V₀²/R)($e^(-t/RC)-e^(-2t/RC))$

  • Option D

    V꜀ = V₀$e^(-t/RC)$

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• MCQmediumCapacitorRC circuit

  A capacitor having initial charge q₀ and capacitance C is connected to a variable resistance R. The resistance R can have values ranging from 0 to R₀. How should we vary R with time (t) such that the discharging current remains constant with time?

  Options

  • Option A

    R = R₀ - t/C

  • Option B

    R = R₀ + t/C

  • Option C

    R = R₀$e^(-t/CR₀)$

  • Option D

    R must remain constant

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• MCQdifficultCurrent electricityCircuit Theory & Kirchhoff’s Laws

  Find current through the cell and potential difference between A and D in the circuit shown in the Figure.

  

  Options

  • Option A

    I = E/R and V(A,D) = E/2

  • Option B

    I = E/(2R) and V(A,D) = E/2

  • Option C

    I = 2E/R and V(A,D) = E

  • Option D

    I = E/R and V(A,D) = 0

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• NumericmediumCurrent electricityCells, Maximum Power & Heating Effect

  Eight identical 1 volt cells are connected to make a ring as shown in the Figure. An ideal voltmeter is connected as shown. What will be its reading?

  

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• MCQmediumCurrent electricityEquivalent Resistance & Networks

  Find equivalent resistance between points A and B in the figure. Each resistance is R.

  

  Options

  • Option A

    R/2

  • Option B

    2R/5

  • Option C

    3R/5

  • Option D

    R

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• Multi-correctdifficultCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  A 10 wire potentiometer has first five wires of cross sectional radius r and next five wires of radius 2r. The wires are uniform and made of same material. An ideal cell of emf 2 V is connected across the potentiometer wire. What length of the potentiometer wire will balance the emf of—

  Select all that apply

  • Option A

    For 1.0 V, balance length = 312.5 cm

  • Option B

    For 1.5 V, balance length = 468.75 cm

  • Option C

    For 1.8 V, balance length = 750 cm

  • Option D

    For 1.8 V, balance length = 875 cm

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