Current Electricity Objective Conversion physics questions with solutions

Showing 1–10 of 30 questions

• MCQdifficultCurrent electricityequivalent resistance

  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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• MCQdifficultCurrent electricitycircuit theory

  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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• Multi-correctdifficultCurrent electricityelectric current ,current density and 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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• MCQeasyCurrent electricitycombination of cells and maximum power theorem

  A battery of emf V and internal resistance r is connected to N identical bulbs, all in parallel. Resistance of each bulb is R. It is observed that maximum cumulative power is dissipated in the bulbs if N = 10. Can we say that r = R/10?

  

  Options

  • Option A

    Yes

  • Option B

    No, r = 10R

  • Option C

    No, r = R/100

  • Option D

    Cannot be determined

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• Multi-correctdifficultCurrent electricitycircuit theory

  In the circuit shown in Figure B1, B2 and B3 are identical bulbs and C is a parallel plate capacitor.
  

  

  Select all that apply

  • Option A

    In steady state, B1 is brightest

  • Option B

    In steady state, B2 and B3 have equal brightness

  • Option C

    While plate separation increases, B3 glows temporarily

  • Option D

    While plate separation increases, B2 becomes dimmer temporarily

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• MCQdifficultCurrent electricityelectric current ,current density and resistance

  A conducting plate of thickness t is in the shape of an arc. Its inner and outer rim form a 30° arc of radius r and 2r respectively at point O (see Figure). Electric current flows through the strip along circular arcs as indicated in the diagram. Find resistance of the plate if its material has conductivity σ.

  

  Options

  • Option A

    π/(6σt ln2)

  • Option B

    6π/(σt ln2)

  • Option C

    πln2/(6σt)

  • Option D

    6/(πσt ln2)

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• NumericdifficultCurrent electricityelectric instruments

  A rotary potentiometer has a circular resistance (C) and a conducting wiper (W) can rotate over it. An ideal battery and an ideal voltmeter are connected to it as shown in the figure. As the wiper is rotated on the circular resistance the reading of the voltmeter changes from zero to 20 V. What is reading of the voltmeter when wiper is at angular position θ = 120°? Assume that resistance C is almost a complete circle and resistance of all connecting wires and knobs in the circuit is zero.

  

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• MCQmediumCurrent electricityelectric instruments

  In the figure shown PQ is a potentiometer wire. When galvanometer is connected at A, it shows zero deflection when PJ = x. Now the galvanometer is connected to B and it shows zero deflection when PJ = 3x. Find the value of unknown resistance Rₓ in term of R.

  

  Options

  • Option A

    Rₓ = R

  • Option B

    Rₓ = 2R

  • Option C

    Rₓ = 3R

  • Option D

    Rₓ = R/2

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• MCQdifficultCurrent electricityequivalent resistance

  An infinite network of resistances has been made as shown in the Figure. Each resistance is R. Find the equivalent resistance between A and B.

  

  Options

  • Option A

    R

  • Option B

    2R

  • Option C

    R/2

  • Option D

    R/3

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• MCQdifficultCurrent electricityelectric current ,current density and resistance

  A conductor having resistivity ρ is bent in the shape of a half cylinder as shown in the figure. The inner and outer radii of the cylinder are a and b respectively and the height of the cylinder is h. A potential difference is applied across the two rectangular faces of the conductor. Calculate the resistance offered by the conductor.

  

  Options

  • Option A

    πρ/[h ln(b/a)]

  • Option B

    ρ ln(b/a)/(πh)

  • Option C

    πρ ln(b/a)/h

  • Option D

    ρ(b-a)/(πah)

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