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Current Electricity Test - 4

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Current Electricity Test - 4
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  • Question 1
    1 / -0

    Two cells of 1.25 V and 0.75 V are connected in series with anode of one connected to anode of the other . The effective voltage will be

    Solution

    The cells are in opposition. 
    Eeq = E1 − E2 = 1.25 − 0.75 = 0.5V

  • Question 2
    1 / -0

    In a potentiometer experiment, for measuring internal resistance of a cell, the balance point has been obtained on the fourth wire. The balance point can be shifted to fifth wire by

    Solution

    If the current due to the auxillary battery is decreased, the potential gradient will be decreases, so the balancing length increases.
    Thus null point will move to fifth wire.

  • Question 3
    1 / -0

    A battery is connected with a potentiometer wire. The internal resistance of the battery is negligible. If the length of the potentiometer wire of the same material and radius is doubled then

    Solution

    Potential gradient Is given by V/l. If V and l are constant, the potential gradient also remains constant. The change in the radius will cause a change in the current. This does not change the potential gradient.

  • Question 4
    1 / -0
    The terminal potential difference of a cell is greater than its e.m.f. when it is
  • Question 5
    1 / -0

    The instrument for the accurate measurement of the e.m.f of a cell is

    Solution

    Both potentiometer and voltmeter are devices to measure potential difference. E M F is the terminal p.d between the electrodes of a cell in open circuit, i.e., when no current is drawn from it. Potentiometer measures the potential difference using null deflection method, where no current is drawn from the cell; whereas voltmeter needs a small current to show deflection. So, accurate measurement of p.d is done using a potentiometer.

  • Question 6
    1 / -0
    The resistivity of a wire depends upon 
  • Question 7
    1 / -0

    A current of 2 A flows in conductors as shown. The potential difference VA - VB will be

    Solution

  • Question 8
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    It is easier to start car engine on a hot day than on a cold day. This is because the internal resistance of the car battery  
  • Question 9
    1 / -0
    An electric cell is
  • Question 10
    1 / -0
    Specific resistance of all metals is most affected by
  • Question 11
    1 / -0
    The resistance of a wire of length L is R. If the wire is stretched to increase its length to 4L, then what will be the new resistance of the wire?
  • Question 12
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    The electrical intensity E, current density J and specific resistance ρ are related to each other through the relation
  • Question 13
    1 / -0
    A uniform wire of resistance R and length L is cut into four equal parts of length L/4 and then connected in parallel combination. What will be the effective resistance of the combination?
  • Question 14
    1 / -0
    If a circuit containing two unequal resistors is connected in parallel,
  • Question 15
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    A teacher asked a student to connect 'N' cells, each of emf 'e' in series to get a total emf of 'Ne'. While connecting, the student, by mistake, reversed the polarity of 'n' cells. Find the total emf of the resulting series combination.
  • Question 16
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    Ohm`s law is the relation between
  • Question 17
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    Which of the following is an example of non-ohmic resistance?
  • Question 18
    1 / -0
    In the electric circuit shown, Three cells each cell has an emf of 2V and internal resistance of 1 connected in series . The external resistance is 2. The value of the current I is (in amperes)

     
  • Question 19
    1 / -0
    A wire has radius r having resistance R , when a wire is stretched and its radius becomes r/2, then its resistance will be
  • Question 20
    1 / -0
    Which of the following setups can be used to verify Ohm's law?
  • Question 21
    1 / -0

    Therefore, the red colour will emerge first after travelling through the slab.

    Solution

    The cells support each other. Eeq = E1 + E2 = 1.25 + 0.75 = 2.0V

  • Question 22
    1 / -0

    Potentiometer measures the potential difference more accurately than a voltmeter, because

    Solution

    Potentiometer measures the potential difference using null deflection method, where no current is drawn from the cell; whereas voltmeter needs a small current to show deflection. So, accurate measurement of p.d is done using a potentiometer.

  • Question 23
    1 / -0

    Kirchhoff’s second law is a consequence of

    Solution

    Work done in moving a charge in a closed circuit is zero, therefore the algebraic sum of potential differences in a closed circuit is zero.

  • Question 24
    1 / -0
    Fuse wire is an alloy of
  • Question 25
    1 / -0

    It is observed in a potentiometer experiment that no current passes through the galvanometer, when the terminals of the cell are connected across a certain length of the potentiometer wire. On shunting the cell by a 2 Ω resistance, the balancing length is reduced to half. The internal resistance of the cell is

    Solution

  • Question 26
    1 / -0
    What is the equivalent resistance across A and B?

  • Question 27
    1 / -0
    A parallel combination of two resistors, of 1 ohm each, is connected in series with a 1.5 ohm resistor. The total combination is connected across a 10 V battery. The current flowing in the circuit is
  • Question 28
    1 / -0

    The sensitivity of the potentiometer can be increased by:

    Solution

    A potentiometer is considered to be sensitive if the potential gradient (dV/dl) is low. Such a potentiometer can measure very small changes in potential difference. Increasing the length of the potentiometer wire decreases the potential gradient. Its sensitivity increases. Increasing potential gradient decreases the sensitivity. increasing the emf of the primary cell and by decreasing the length, potential gradient increases.

  • Question 29
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    Melting point of fuse wire should be
  • Question 30
    1 / -0
    Two wires with the same dimensions and resistivities 1 and 2 are connected in series. The equivalent resistivity of the combination is
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