Basic electrical MCQ #7

1) ________ is the function of insulating material.
      (a) conducting very large currents
      (b) preventing a short circuit between conducting wires
      (c) preventing an open circuit between the voltage source and the load 
      (d) storing very high currents

2) Which is the best conductor of electricity _______________?
      (a) Silver
      (b) Carbon 
      (c) Copper
      (d) Iron 

3) Two resistors are said to be connected in series when___________?
      (a) total current equals the sum of branch currents
      (b) both carry the same value of current
      (c) same current passes in turn through both 
      (d) sum of IR drops equals the applied EMF

4) Which instrument is used to detect the current?
      (a) voltmeter
      (b) rheostat
      (c) galvanometer 
      (d) wattmeter

ANSWER: | 1-c | 2-a | 3-c | 4-c |


5) Electric pressure is also called as________?
      (a) resistance
      (b) power
      (c) voltage
      (d) energy

6) Ideal current source has ______ internal resistance.
      (a) infinite 
      (b) zero
      (c) finite
      (b) 10 ohms

7) Internal resistance of ideal voltage source is ?
      (a) infinite
      (b) zero 
      (c) finite
      (d) 10 ohms

8) Capacitor does not allow the sudden change of ?
      (a) voltage 
      (b) power
      (c) current 
      (d) None of the above

ANSWER: | 5-c | 6-a | 7-b | 8-a |


9) The resistivity of the conductor depends on
      (a) length of the conductor. 
      (b) area of the conductor.
      (c) type of material.
      (d) none of these.

10) Inductor does not allow the sudden change of _______.
      (a) current
      (b) voltage
      (c) power
      (d) None of the above

11) The unit of resistivity is
      (a) Ω.
      (b) Ωm.
      (c) Ω / m.
      (d) Ω / m².

12) Magnetic flux has the unit of
      (a) Newton
      (b) Ampere-turn
      (c) Tesla
      (d) Weber 

ANSWER: | 9-c | 10-a | 11-b | 12-c |