JEE Main Physics: Current Electricity Practice Questions

15 questions with answers and step-by-step solutions. Tap any question to see the full worked solution.

  1. Q1.
    A wire of resistance 10 ohms is stretched to double its original length. What is the new resistance of the wire?
    Easy
  2. Q2.
    What is the equivalent resistance of two resistors of 2 ohms and 4 ohms connected in series?
    Easy
  3. Q3.
    According to Ohm's law, which of the following relations is correct?
    Easy
  4. Q4.
    A current of 2 amperes flows through a conductor for 10 seconds. What is the total charge that passes through the conductor?
    Easy
  5. Q5.
    What is the power dissipated by a resistor of 5 ohms when a current of 2 amperes flows through it?
    Easy
  6. Q6.
    A wire of resistance 10 ohms is stretched to twice its original length. What is the new resistance of the wire?
    Medium
  7. Q7.
    In a potentiometer experiment, the balancing length for a cell of EMF 1.5 volts is 300 cm. If the cell is replaced by another cell of EMF 2.5 volts, what will b
    Medium
  8. Q8.
    A battery of EMF 12 volts and internal resistance 2 ohms is connected to an external resistor. If the current in the circuit is 2 amperes, what is the value of
    Medium
  9. Q9.
    Three resistors of 2 ohms, 3 ohms, and 6 ohms are connected in parallel. What is the equivalent resistance of the combination?
    Medium
  10. Q10.
    A heater coil is cut into two equal parts and only one part is used in the heater. The heat generated will now be how many times the original heat generated for
    Medium
  11. Q11.
    Hard
  12. Q12.
    In a potentiometer circuit, a cell of emf E is balanced by a length l. If the internal resistance of the cell is r and it is shunted by a resistance R, the new
    Hard
  13. Q13.
    A galvanometer of resistance G is shunted by a resistance S. To increase the range of the galvanometer to n times its original value, what should be the value o
    Hard
  14. Q14.
    A battery of emf E and internal resistance r is connected to a variable resistor R. The power delivered to the resistor is maximum when R equals r. What is the
    Hard
  15. Q15.
    In a meter bridge experiment, the balance point is found at 40 cm from the left end. If a resistance of 10 ohms is connected in series with the left resistor, t
    Hard

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