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Current Electricity 5 Mark Creative Question Paper With Answer Key

12th Standard

    Reg.No. :
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Physics

Time : 01:00:00 Hrs
Total Marks : 75

    5 Marks

    15 x 5 = 75
  1. The current through an element is shown in the figure. Determine the total charge that pass through the element at a) t = 0 s, b) t = 2 s, c) t = 5s

  2. Calculate the effect internal resistance in series and parallel.

  3. Explain the variation of resistivity of conductor and semiconductor with change in temperature.

  4. What is potentiometer? Give its constant and 5 principles.

  5. Explain what is
    (i) Thomson effect,
    (ii) Positive Thomson effect,
    (iii) Negative effect.

  6. A carbon resistor has coloured strips. What is its resistors?

  7. How will you represent a resistor of 3700\(\Omega \) ± 10 by colour code?

  8. Two students A & B were asked to pick a resistor of 25 k from a collection of carbon resistors. A picked a resistors with bands of colours of red, green, orange, white. B picked a resistor with bands of colours: black, green, red who picked the correct resistor?

  9. A conductor of length I is connected to d.c. source of potential V. If the length of the conductor is doubled by treating it, keeping V constant, explain how do the following factors vary in the conductor
    (i) Drift velocity.
    (ii) Resistor
    (iii) Resistivity.

  10. Write mathematical relation between
    (i) mobility & drift velocity of charge carriers in a conductor
    (ii) mobility & relaxation time (or) mean free time.

  11. I - V graph for a metallic wire at two different temperatures T1 & T2 as shown in figure. Which of the two temperature is lower. Why?

  12. Using the concept of drift velocity of charge carries in a conductor, deduce the relationship between circuit density and resistivity of the conductor?

  13. The V - I graphs of two resistors and their series combination are shown in the figure. Which one of these graph represents the series combination of the other two? Given reason.

  14. The variation of potential difference V with length l in the case of two potentiometer A & B is shown. Which of these two will you prefer for finding the emf of a cell or for comparing emfs of two primary cells?

  15. Two metallic wires P1 & P2 of the same material & same length but different cross sectional areas A1 & A2 are joined together & connected to a source of emf. Find the ratio of the drift velocities of free electrons in the two wires when they are connected
    (i) in series &
    (ii) in parallel.

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