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Set 24 of 25 · Questions 691-720 of 723

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JEE Main Physics · Current Electricity · Set 24 (Q691-720)

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  1. 691.
    Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across A and B, their readings are and . Choose the correct option.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  2. 692.
    A carbon resistance has a following colour code. What is the value of the resistance?
    1. (1)5.3 MΩ + 5%
    2. (2)530 kΩ + 5%
    3. (3)64 kΩ + 10%
    4. (4)6.4 MΩ + 5%
  3. 693.
    The current in the given circuit is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  4. 694.
    The equivalent resistance between A and B is:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  5. 695.
    Find the equivalent resistance between two ends of the following circuit
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  6. 696.
    To verify Ohm's law, a student connects the voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained :

    If is almost zero, identify the correct statement
    1. (1)The emf of the battery is and its internal resistance is
    2. (2)The value of the resistance is
    3. (3)The potential difference across the battery is 1.5 V when it sends a current of
    4. (4)The emf of the battery is and the value of is
  7. 697.
    The equivalent resistance of the given circuit between the terminals A and B is:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  8. 698.
    In the given circuit, the terminal potential difference of the cell is:
    1. (1)2 V
    2. (2)3 V
    3. (3)4 V
    4. (4)
  9. 699.
    From the combination of resistors with resistances values and , which of the following combination is the best circuit to get an equivalent resistance of ?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  10. 700.
    The colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  11. 701.
    In the below circuit the current in each resistance is:
    1. (1)0 A
    2. (2)1 A
    3. (3)0.25 A
    4. (4)0.5 A
  12. 702.
    Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
    Assertion A: For measuring the potential difference across a resistance of 600 , the voltmeter with resistance 1000 will be preferred over voltmeter with resistance 4000 .
    Reason R: Voltmeter with higher resistance will draw smaller current than voltmeter with lower resistance.
    In the light of the above statements, choose the most appropriate answer from the options given below.
    1. (1)A is not correct but R is correct
    2. (2)Both A and R are correct and R is the correct explanation of A
    3. (3)Both A and R are correct but R is not the correct explanation of A
    4. (4)A is correct but R is not correct
  13. 703.
    Fuse wire is a wire of
    1. (1)high resistance and high melting point
    2. (2)high resistance and low melting point
    3. (3)low resistance and low melting point
    4. (4)low resistance and high melting point
  14. 704.
    Which of the following acts as a circuit protection device?
    1. (1)fuse
    2. (2)conductor
    3. (3)inductor
    4. (4)switch
  15. 705.
    The resistance of each arm of the Wheatstone’s bridge is 10 ohm. A resistance of 10 ohm is connected in series with a galvanometer then the equivalent resistance across the battery will be
    1. (1)10 ohm
    2. (2)15 ohm
    3. (3)20 ohm
    4. (4)40 ohm.
  16. 706.
    Identify the set in which all the three materials are good conductors of electricity
    1. (1)Cu,Hg and
    2. (2) and
    3. (3) and
    4. (4) and diamond.
  17. 707.
    The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by 50%. The percentage change in voltage sensitivity of the galvanometer will be:
    1. (1)100%
    2. (2)50%
    3. (3)75%
    4. (4)0%
  18. 708.
    Kirchhoff's junction rule is a reflection of
    1. (1)Conservation of momentum
    2. (2)Conservation of current density vector
    3. (3)Conservation of charges
    4. (4)Conservation of energy.
  19. 709.
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
    Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils.
    Reason R: Constantan and manganin have very small value of temperature coefficient of resistance.
    In the light of the above statements, choose the correct answer from the options given below.
    1. (1)Both A and R are true and R is the correct explanation of A.
    2. (2)Both A and R are true but R is NOT the correct explanation of A.
    3. (3)A is true but R is false.
    4. (4)A is false but R is true.
  20. 710.
    The value of in the figure shown below is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  21. 711.
    The equivalent resistance between points A and B in the given network is :
    1. (1)65
    2. (2)20
    3. (3)5
    4. (4)2
  22. 712.
    A, B and C are voltmeters of resistance R, 1.5R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are , and respectively. Then:
    1. (1) ¹ =
    2. (2) = ¹
    3. (3) ¹ ¹
    4. (4) = =
  23. 713.
    In the given circuit, the equivalent resistance between A and B is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  24. 714.
    Consider a galvanometer shunted with resistance and 2% of current passes through it. What is the resistance of the given galvanometer?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  25. 715.
    If you are provided a set of resistances and . Connect these resistances so as to obtain an equivalent resistance of
    1. (1) and are in parallel with 2 and 8 in series
    2. (2)6 and 8 are in parallel with 2 and 4 in series
    3. (3)2 and 6 are in parallel with 4 and 8 in series
    4. (4)2 and 4 are in parallel with 6 and 8 in series
  26. 716.
    The total current supplied to the circuit as shown in figure by the 5V battery is ______ A
  27. 717.
    For the network shown below, the value - is ________V.
  28. 718.
    The net current flowing in the given circuit is A.
  29. 719.
    In the given figure of meter bridge experiment, the balancing length AC corresponding to null deflection of the galvanometer is 40 cm. The balancing length, if the radius of the wire AB is doubled, will be..........cm.
  30. 720.
    A square shaped wire with resistance of each side is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in unit of will be .