Basic Electrician Theory MCQ In English ||06||

1. Ohm's Law does not apply

(A) Vacuum tube

(B) carbon resistors

(C) High voltage circuit

(D) none of these

Answer: (A)

2. Who is the best conductor of electricity?

(A) Iron

(B) Silver

(C) copper

(D) Carbon

Ans: (B)

3. For which of the following can the ampere second unit be?

(A) Reluctance

(B) Charge

(C) Power

(D) Energy

Ans: (B)

4. All of which are equivalent to watts except for the following

(A) (ampere) ohm

(B) Joules / sec

(C) ampere x volt

(D) ampere / volt

Ans: (D)

5. 10 ohms, the resistance with a rating of 10 w will be

(A) metallic resistor

(B) carbon resistor

(C) wire wound resistor

(D) variable resistor

Answer: (C)

6. Which of the following is not negative temperature co-efficient?

(A) aluminum

(B) paper

(C) rubber

(D) Mica

Answer: (A)

7. Varistors are

(A) Insulator

(B) non-linear resistors

(C) carbon resistors

(D) Resistant with zero temperature coefficient

Ans: (B)

8. Insulating material has function

(A) Preventing short circuit between wiring operations

(B) Stopping an open circuit between voltage source and load

(C) Conducting very large currents

(D) Storage of very high currents

Ans: (B)

9. The rating of a fuse wire is always expressed

(A) ampere-hour

(B) ampere-volt

(C) kWh

(D) Ampere

Ans: (D)

10. Ion has a minimum charge

(A) equal to atomic number of atoms

(B) equal to the charge of an electron

(C) One atom (#) equal to the charge of the number of electrons in zero

(D) Ampere

Ans: (B)

11. In a series circuit with unequal resistors

(A) The highest resistance has the highest current through it.

(B) The lowest resistance has the highest voltage drop

(C) Lowest resistance has highest current

(D) The highest resistance has the highest voltage drop

Ans: (D)

12. What is the filament of electric bulb made of?

(A) Carbon

(B) aluminum

(C) tungsten

(D) Nickel

Answer: (C)

13. When a current of 2amp flows in a 3ohms resistance, power will be expended

(A) 2 watts

(B) 4 watts

(C) 6 watts

(D) 12 watts

Answer: (D)

14. Which of the following statements is true?

(A) A galvanometer is a voltmeter with low resistance in parallel

(B) A galvanometer with high resistance in parallel is a voltmeter

(C) A galvanometer with low resistance in series is an ammeter

(D) A galvanometer with high resistance in series is an ammeter

Answer: (C)

15. The resistance of a few meters of wire conductors in a closed electrical circuit is

(A) practically zero

(B) less

(C) high

(D) is too much

Answer: (A)

16. If the main line is opened in a parallel circuit, the current

(A) grows in the branch of lowest resistance

(B) grows in each branch

(C) All branches have zero

(D) is zero at the highest resistance branch

Answer: (C)

17. If a wire conductor of 0.2 ohm resistance doubles in length, its resistance becomes

(A) 0.4 ohm

(B) 0.6 ohm

(C) 0.8 ohm

(D) 1.0 ohm

Answer: (A)

18. Three 60 W, 60 V bulbs are connected in parallel to the power line. If a bulb burns

(A) There will be heavy current in the main line

(B) The remaining two bulbs will not light

(C) All three bulbs will light

(D) The other two bulbs will light

Ans: (D)

19. Four 40 watt bulbs are connected in series with the battery, which of the following statements is correct?

(A) Current will flow through each bulb

(B) The voltage in each bulb is not the same

(C) Electrical dissipation is not same in every bulb

(D) None of the above

Answer: (A)

20. The resistance of a closed switch is

(A) zero

(B) about 50 ohms

(C) around 500 ohms

(D) Infinite

Answer: (A)