Class X

By convention, the charge on a glass rod that has been rubbed with silk is called
  1. Positive
  2. Negative
  3. either positive or negative
  4. none of these
. Current is measured in Amperes using _______.
  1. work done, 1J(1 Joule)
  2. Ohm-meter (Ωm)
  3. sum, R = R1 + R2 + R3 + ...
  4. ammeter
The _________ of the material is the resistance per unit length of a unit cross section of the material
  1. 18 Ω
  2. parallel
  3. Ohm-meter (Ωm)
  4. resistivity
The effective resistance is less than any individual resistances when resistances are connected in _________.
  1. parallel
  2. series
  3. work done, 1J(1 Joule)
  4. Ohm-meter (Ωm)
If 90 coulombs charge passes through the conductor for 5 minutes, then the current in the conductor is _____.
  1. 0.3A
  2. work done, 1J(1 Joule)
  3. Ohm-meter (Ωm)
  4. sum, R = R1 + R2 + R3 + ...
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