Questions and Answers related to current 1 | Electrical Questions
MCQ type questions and answers of current which helps a lot in competitive exams and also extend your basic knowledge about in electrical branch, Questions and answers are given below
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| Questions and Answers related to current 1 | Electrical Questions |
Questions & Answers
Q.1. Which is the best conductor of
electricity?
(a)Iron
(b)Silver
(c)Copper
(d)Carbon
Ans.
(b)Silver
Q.2. For which of the following 'ampere
second 'could be the unit?
(a)Reluctance
(b)Charge
(c)Power
(d)Energy
Ans.
(b)Charge
Q.3. All of the following are equivalent to
watt except
(a)(amperes)ohm
(b)joules/sec.(c)amperes x volts
(d)amperes/volt
Ans.
(d)amperes/volt
Q.4. A resistance having rating 10 ohms,10
W is likely to be a
(a)metallic resistor
(b)carbon resistor
(c)wire wound resistor
(d)variable resistor
Ans.
(c)wire wound resistor
Q.5. Which one of the following does not
have negative temperature co-efficient?
(a)Aluminum
(b)Paper
(c)Rubber
(d)Mica
Ans.
(a)Aluminum
Q.6. Varistors are
(a)insulators
(b)non-linear resistors
(c)carbon resistors
(d)resistors with zero temperature co-
efficient
Ans.
(b)non-linear resistors
Q.7. Insulating materials have the function
of
(a)preventing a short circuit between
conducting wires
(b)preventing an open circuit between
the voltage source and the load
(c)conducting very large currents
(d)storing very high currents
Ans.
(a)preventing a short circuit between
conducting wires
Q.8. The rating of a fuse wire is always
expressed in
(a)ampere-hours
(b)ampere-volts
(c)kWh
(d)amperes
Ans.
(d)amperes
Q.9. The minimum charge on an ion is..
(a)equal to the atomic number of the
atom
(b)equal to the charge of an electron.
(c)equal to the charge of the number
of electrons in an atom
(d)zero
Ans.
(b)equal to the charge of an electron.
Q.10. In a series circuit with unequal
resistances
(a)the highest resistance has the most
of the current through it
(b)the lowest resistance has the
highest voltage drop
(c)the lowest resistance has the
highest current
(d)the highest resistance has the
highest voltage drop
Ans.
(d)the highest resistance has the
highest voltage drop
Q.11. The filament of an electric bulb is made
of
(a)carbon
(b)aluminum
(c)tungsten
(d)nickel
Ans.
(c)tungsten
Q.12. A 3 ohm resistor having 2 A current will
dissipate the power of
(a)2 watts
(6)4 watts
(c)6 watts
(d)8 watts
Ans.
(c)6 watts
Q.13. Which of the following statement is
true?
(a)A galvanometer with low resistance
in parallel is a voltmeter
(b)A galvanometer with high resis-
tance in parallel is a voltmeter
(c)A galvanometer with low resistance
in series is an ammeter
(d)A galvanometer with high resis-
tance in series is an ammeter
Ans.
(c)A galvanometer with low resistance
in series is an ammeter
Q.14. The resistance of a few meters of wire
conductor in closed electrical circuit is
(a)practically zero
(b)low
(c)high
(d)very high
Ans.
(a)practically zero
Q.15. If a parallel circuit is opened in the
main line, the current
(a)increases in the branch of the
lowest resistance
(b)increases in each branch
(c)is zero in all branches
(d)is zero in the highest resistive
branch
Ans.
(c)is zero in all branches
Q.16. If a wire conductor of 0.2 ohm resis-
tance is doubled in length, its resis-
tance becomes
(a)0.4 ohm
(b)0.6 ohm
(c)0.8 ohm
(d)1.0 ohm
Ans.
(a)0.4 ohm
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