An electric circuit has a 30 V battery and a resistor of 90 ohm. Then, the current in the circuit will be:
  • 30 A
  • 0.33 A
  • 0.11 A
  • 1.30 A
The resistivity of a wire:
  • varies with its length
  • varies with its mass
  • is independent of length, cross section and mass of the wire.
  • varies with its cross section
In the experiment on studying the dependence of current I on the potential difference V, three students plotted the following V and I. The graph that is likely to be correct is/are:
209188_image040-300x114.jpg
  • Student III only
  • Student II only
  • All the three students
  • Student I only
The graph between current (I) and potential difference (V) in the experimental verification of Ohm's Law drawn by four students. Which one is correct?A)B) C) D)
01.jpg
122.jpg
03.jpg
04.jpg
  • A)
  • B)
  • C)
  • D)
Electric current always flows
  • Either lower to higher or higher to lower
  • At same potential
  • From lower to higher potential
  • From higher to lower potential
The copper wires whose masses are 8 gm and 12 gm have lengths in the ratio 3:Find the ratio of their resistances.
  • 25 : 32
  • 32 : 27
  • 27 : 32
  • 32 : 25
The potential difference of a circuit is constant. If the resistance of a circuit is doubled, then its current will become;
  • 4 I
  • I/2
  • 2 I
  • I
The potential difference across a conductor is 14 V. If it carries a current of 3.5 A, calculate the resistance of the conductor.
  • 4 Ω
  • 1.33 Ω
  • 1 Ω
  • 2 Ω
The current flowing through a resistor connected in an electric circuit and the potential difference developed across the ends of it are as shown in the diagramsThe value of the resistance of the resistor used in Ohm is:
011-300x142.jpg
  • 0.024
  • 24
  • 17.5
  • 0.02
Electric current will stop flowing when the potential difference is
  • Infinity
  • Zero
  • High
  • Low
0 h : 0 m : 1 s

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