Current Electricity Objective Practice Test

Practice Test: Question Set - 09


1. The thickness of insulation provided on the conductor depends on
    (A) The magnitude of voltage on the conductor
    (B) The magnitude of current flowing through it
    (C) Both (A) and (B)
    (D) None of the above

2. Conductance is reciprocal of
    (A) Resistance
    (B) Inductance
    (C) Reluctance
    (D) Capacitance

3. Which of the following material has nearly zero temperature coefficient of resistance?
    (A) Manganin
    (B) Porcelain
    (C) Carbon
    (D) Copper

4. You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect
    (A) Two in parallel
    (B) Two in parallel and one in series
    (C) Three in parallel
    (D) Three in series

5. The rating of a fuse wire is always expressed in
    (A) Ampere-hours
    (B) Ampere-volts
    (C) kWh
    (D) Amperes

6. A 3 Q resistor having 2 A current will dissipate the power of
    (A) 2 watts
    (B) 4 watts
    (C) 6 watts
    (D) 8 watts

7. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
    (A) 0.4 ohm
    (B) 0.6 ohm
    (C) 0.8 ohm
    (D) 1.0 ohm

8. A closed switch has a resistance of
    (A) Zero
    (B) About 50 ohms
    (C) About 500 ohms
    (D) Infinity

9. The insulation on a current carrying conductor is provided
    (A) To prevent leakage of current
    (B) To prevent shock
    (C) Both of above factors
    (D) None of above factors

10. With rise in temperature the resistance of pure metals
    (A) Increases
    (B) Decreases
    (C) First increases and then decreases
    (D) Remains constant

11. Resistance of a tungsten lamp as applied voltage increases
    (A) Decreases
    (B) Increases
    (C) Remains same
    (D) None of the above

12. When one leg of parallel circuit is opened out the total current will
    (A) Reduce
    (B) Increase
    (C) Decrease
    (D) Become zero

13. Resistance of carbon filament lamp as the applied voltage increases.
    (A) Increases
    (B) Decreases
    (C) Remains same
    (D) None of the above

14. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
    (A) 4 : 25
    (B) 25 : 4
    (C) 2 : 5
    (D) 5 : 2

15. For testing appliances, the wattage of test lamp should be
    (A) Very low
    (B) Low
    (C) High
    (D) Any value

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