Back to Current Electricity

Set 20 of 25 · Questions 571-600 of 723

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher

Mere Teacher · Previous Year Questions

JEE Main Physics · Current Electricity · Set 20 (Q571-600)

QR code to mereteacher.com

Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.

  1. 571.
    A direct current of 4 A and an alternating current of peak value 4A flow through resistance of 3 and 2 respectively. The ratio of heat produced in the two resistances in same interval of time will be:
    1. (1)3 : 2
    2. (2)3 : 1
    3. (3)3 : 4
    4. (4)4: 3
  2. 572.
    In this circuit, when certain current flows, the heat produced in is in a time . The heat produced in coil in the same time interval is
    1. (1)5.76
    2. (2)1.44
    3. (3)2.88
    4. (4)2.02
  3. 573.
    A potentiometer wire AB having length L and resistance is joined to a cell D of and internal resistance r. A cell C having and internal resistance 3 r is connected. The length AJ at which the galvanometer as shown in fig. shows no deflection is:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  4. 574.
    Two cells of same emf but different internal resistances and are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero, is
    1. (1)-
    2. (2)-
    3. (3)
    4. (4)
  5. 575.
    The current in the given circuit will be
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  6. 576.
    In a wheatstone bridge as shown in the figure. What will be the condition for no deflection in galvanometer?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  7. 577.
    A battery consists of a variable number (n) of identical cells, each having an internal resistance r connected in series. The terminals of the battery are short-circuited. A graph of current (I) in the circuit verses the number of cells will be as shown in figure.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  8. 578.
    In the following network, the current flowing through resistance is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  9. 579.
    Figure shows a part of an electric circuit. The potentials at points a, b and c are 30 V, 12 V and 2 V respectively. The current through the 20 resistor will be,
    1. (1)1.0A
    2. (2)0.4 A
    3. (3)0.6 A
    4. (4)0.2 A
  10. 580.
    In the circuit shown, the value of I in ampere is
    1. (1)1
    2. (2)0.60
    3. (3)0.4
    4. (4)1.5
  11. 581.
    The equivalent resistance of the circuit shown below between points a and b is:
    1. (1)16
    2. (2)3.2
    3. (3)24
    4. (4)20
  12. 582.
    A resistance is shown in the figure. Its value and tolerance are given respectively by:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  13. 583.
    Two identical batteries each of e.m.f and internal resistance are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across using these batteries is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  14. 584.
    In the figure shown, what is the current (in Ampere) drawn from the battery? You are given:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  15. 585.
    In the circuit, the cells are having negligible resistances. If the galvanometer shows null defection then the value of ' V ' is
    1. (1)
    2. (2)6 V
    3. (3)4 V
    4. (4)2 V
  16. 586.
    The current (in A) flowing through 1 Ω resistor in the following circuit is
    1. (1)0.2
    2. (2)0.4
    3. (3)0.5
    4. (4)0.25
  17. 587.
    From the graph between current (I) and voltage (V) is shown. Identify the portion corresponding to negative resistance
    1. (1)CD
    2. (2)DE
    3. (3)AB
    4. (4)BC
  18. 588.
    Potential difference between and in the following circuit
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  19. 589.
    In the circuit, given in the figure currents in different branches and value of one resistor are shown. Then potential at point with respect to the point A is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  20. 590.
    In the given circuit diagram, a wire is joining points B and D. The current in this wire is:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  21. 591.
    In a wheatstone bridge (see fig.), Resistances P and Q are approximately equal. When R = 400 Ω, the bridge is balanced. On interchanging P and Q, the value of R, for balance, is 405 Ω. The value of X is close to:
    1. (1)404.5 ohm
    2. (2)402.5 ohm
    3. (3)403.5 ohm
    4. (4)401.5 ohm
  22. 592.
    In this circuit, the value of is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  23. 593.
    Two rods are joined end to end, as shown. Both have a cross‐ sectional area of . Each is1 meter long. One rod is of copper with a resistivity of ohm‐centimeter, the other is of iron with a resistivity of ohm‐centimeter. How much voltage is required to produce a current of 1 ampere in the rods?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  24. 594.
    Current through resistor is 0.8 ampere, then potential drop through resistor is
    1. (1)9.
    2. (2)2.
    3. (3)4.
    4. (4)1.
  25. 595.
    The current density in a cylindrical wire of radius r = 4.0 mm is 1.0 x 106 A/. The current through the outer portion of the wire between radial distances r/2 and r is xA; where x is_______.
  26. 596.
    An ideal cell of emf is connected in circuit shown in figure. Each resistance is The potential difference (in V) across the capacitor when it is fully charged is
  27. 597.
    The current flowing through the resistor is . The value of is_____
  28. 598.
    In the given circuit the value of is:
  29. 599.
    The equivalent resistance between the points and in the following circuit is . The value of is .
  30. 600.
    In an electric circuit, a call of certain emf provides a potential difference 1.25V of across a load resistance of . However, it provides a potential difference of 1V across a load resistance of . The emf of the cell is given by . Then the value of x is ____.