Questions - Resistance

Question file 6


  1. The total resistance in a parallel circuit:                                          STUDY NOTES 
    1. is always less than the smallest resistance
    2. depends upon the voltage drop across each branch        QUESTIONS WITHOUT ANSWERS 
    3. could be equal to the resistance of one branch
    4. depends upon the applied voltage
    ========= Answer is a =========
  2. Two resistors are connected in parallel and are connected across a 40 volt battery. If each resistor is 1000 ohms, the total battery current is:
    1. 40 ampere
    2. 40 milliampere
    3. 80 ampere
    4. 80 milliampere
    ========= Answer is d =========
  3. The total current in a parallel circuit is equal to the:
    1. current in any one of the parallel branches
    2. sum of the currents through all the parallel branches
    3. applied voltage divided by the value of one of the resistive elements
    4. source voltage divided by the sum of the resistive elements
    ========= Answer is b =========
  4. One way to operate a 3 volt bulb from a 9 volt supply is to connect it in:
    1. series with the supply
    2. parallel with the supply
    3. series with a resistor
    4. parallel with a resistor
    ========= Answer is c =========
  5. You can operate this number of identical lamps, each drawing a current of 250 mA, from a 5A supply:
    1. 50
    2. 30
    3. 20
    4. 5
    ========= Answer is c =========
  6. Six identical 2-volt bulbs are connected in series. The supply voltage to cause the bulbs to light normally is:
    1. 12 V
    2. 1.2 V
    3. 6 V
    4. 2 V
    ========= Answer is a =========
  7. This many 12 volt bulbs can be arranged in series to form a string of lights to operate from a 240 volt power supply:
    1. 12 x 240
    2. 240 + 12
    3. 240 - 12
    4. 240 / 12
    ========= Answer is d =========
  8. Three 10,000 ohm resistors are connected in series across a 90 volt supply. The voltage drop across one of the resistors is:
    1. 30 volt
    2. 60 volt
    3. 90 volt
    4. 15.8 volt
    ========= Answer is a =========
  9. Two resistors are connected in parallel. R1 is 75 ohm and R2 is 50 ohm. The total resistance of this parallel circuit is:
    1. 10 ohm
    2. 70 ohm
    3. 30 ohm
    4. 40 ohm
    ========= Answer is c =========
  10. A dry cell has an open circuit voltage of 1.5 volt. When supplying a large current the voltage drops to 1.2 volt. This is due to the cell's:
    1. internal resistance
    2. voltage capacity
    3. electrolyte becoming dry
    4. current capacity
    ========= Answer is a =========
  11. A 6 ohm resistor is connected in parallel with a 30 ohm resistor. The total resistance of the combination is:
    1. 5 ohm
    2. 8 ohm
    3. 24 ohm
    4. 35 ohm
    ========= Answer is a =========
  12. The total resistance of several resistors connected in series is:
    1. less than the resistance of any one resistor
    2. greater than the resistance of any one resistor
    3. equal to the highest resistance present
    4. equal to the lowest resistance present
    ========= Answer is b =========
  13. Five 10 ohm resistors connected in series give a total resistance of:
    1. 1 ohm
    2. 5 ohms
    3. 10 ohms
    4. 50 ohms
    ========= Answer is d =========
  14. Resistors of 10, 270, 3900, and 100 ohm are connected in series. The total resistance is:
    1. 9 ohm
    2. 3900 ohm
    3. 4280 ohm
    4. 10 ohm
    ========= Answer is c =========
  15. This combination of series resistors could replace a single 120 ohm resistor:
    1. five 24 ohm
    2. six 22 ohm
    3. two 62 ohm
    4. five 100 ohm
    ========= Answer is a =========
  16. If a 2.2 megohm and a 100 kilohm resistor are connected in series, the total resistance is:
    1. 2.1 megohm
    2. 2.11 megohm
    3. 2.21 megohm
    4. 2.3 megohm
    ========= Answer is d =========
  17. If ten resistors of equal value R are wired in parallel, the total resistance is:
    1. R
    2. 10R
    3. 10/R
    4. R/10
    ========= Answer is d =========
  18. The total resistance of four 68 ohm resistors wired in parallel is:
    1. 12 ohm
    2. 17 ohm
    3. 34 ohm
    4. 272 ohm
    ========= Answer is b =========
  19. Resistors of 68 ohm, 47 kilohm, 560 ohm and 10 ohm are connected in parallel. The total resistance is:
    1. less than 10 ohm
    2. between 68 and 560 ohm
    3. between 560 and and 47 kilohm
    4. greater than 47 kilohm
    ========= Answer is a =========
  20. The following resistor combination can most nearly replace a single 150 ohm resistor:
    1. four 47 ohm resistors in parallel
    2. five 33 ohm resistors in parallel
    3. three 47 ohm resistors in series
    4. five 33 ohm resistors in series
    ========= Answer is c =========
  21. Two 120 ohm resistors are arranged in parallel to replace a faulty resistor. The faulty resistor had an original value of:
    1. 15 ohm
    2. 30 ohm
    3. 60 ohm
    4. 120 ohm
    ========= Answer is c =========
  22. Two resistors are in parallel. Resistor A carries twice the current of resistor B which means that:
    1. A has half the resistance of B
    2. B has half the resistance of A
    3. the voltage across A is twice that across B
    4. the voltage across B is twice that across B
    ========= Answer is a =========
  23. The smallest resistance that can be made with five 1 k ohm resistors is:
    1. 50 ohm by arranging them in series
    2. 50 ohm by arranging them in parallel
    3. 200 ohm by arranging them in series
    4. 200 ohm by arranging them in parallel
    ========= Answer is d =========
  24. The following combination of 28 ohm resistors has a total resistance of 42 ohm:
    1. three resistors in series
    2. three resistors in parallel
    3. a combination of two resistors in parallel, then placed in series with another resistor
    4. a combination of two resistors in parallel, then placed in series with another two in parallel
    ========= Answer is c =========
  25. Two 100 ohm resistors connected in parallel are wired in series with a 10 ohm resistor. The total resistance of the combination is:
    1. 60 ohms
    2. 180 ohms
    3. 190 ohms
    4. 210 ohms
    ========= Answer is a =========
  26. A 5 ohm and a 10 ohm resistor are wired in series and connected to a 15 volt power supply. The current flowing from the power supply is:
    1. 0.5 ampere
    2. 1 ampere
    3. 2 ampere
    4. 15 ampere
    ========= Answer is b =========
  27. Three 12 ohm resistors are wired in parallel and connected to an 8 volt supply. The total current flow from the supply is:
    1. 1 ampere
    2. 2 amperes
    3. 3 amperes
    4. 4.5 amperes
    ========= Answer is b =========
  28. Two 33 ohm resistors are connected in series with a power supply. If the current flowing is 100 mA, the voltage across one of the resistors is:
    1. 66 volt
    2. 33 volt
    3. 3.3 volt
    4. 1 volt
    ========= Answer is c =========
  29. A simple transmitter requires a 50 ohm dummy load. You can fabricate this from:
    1. four 300 ohm resistors in parallel
    2. five 300 ohm resistors in parallel
    3. six 300 ohm resistors in parallel
    4. seven 300 ohm resistors in parallel
    ========= Answer is c =========
  30. Three 500 ohm resistors are wired in series. Short-circuiting the centre resistor will change the value of the network from:
    1. 1500 ohm to 1000 ohm
    2. 500 ohm to 1000 ohm
    3. 1000 ohm to 500 ohm
    4. 1000 ohm to 1500 ohm
    ========= Answer is a =========