Class X

Which of the following correctly represents the relation among Charge (Q), Potential difference (V) and Work done (W)
  1. V = W × Q
  2. W = V / Q
  3. V = Q / W
  4. V = W / Q
The source of all electricity is ______. It’s SI unit is _________.
  1. work done, 1J(1 Joule)
  2. charge, coulomb (C)
  3. Ohm-meter (Ωm)
  4. sum, R = R1 + R2 + R3 + ...
. When two resistances of 6 Ω and 12 Ω are connected in parallel then the effective resistance is _____.
  1. 4 Ω
  2. : parallel
  3. watt (W
  4. Ohm-meter (Ωm)
An electric fuse is based on
  1. the heating effect of the current
  2. the chemical effect of the current
  3. the magnetic effect of the current
  4. none of these
The resistance of a conductor is directly proportional to its _____.
  1. 18 Ω
  2. Ohm-meter (Ωm)
  3. work done, 1J(1 Joule)
  4. length
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