Question 2: 6-ohm resistors are connected to form a triangle. What is the resistance between any two corners

A.3/2 Ohm
B.6 Ohm
C.4 Ohm
D.8/3 Ohm

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] 4 Ohm [/bg_collapse]

Question 3: Ohm’s law is not applicable to

A.semi-conductors
B.D.C. circuits
C.small resistors
D.high currents

Question 4: Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having a smaller cross-sectional area has a resistance of 40 ohms the resistance of another conductor will be

A.160 ohms
B.80 ohms
C.20 ohms
D.10 ohms

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] 10 ohms [/bg_collapse]

Question 5: A nichrome wire used as a heater coil has the resistance of 2 ohms. For a heater of 1 kW at 200 V, the length of wire required will be

A.80 m
B.60 m
C.40 m
D.20 m

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] 80 m [/bg_collapse]

Question 6: Temperature coefficient of resistance is expressed in terms of

A.ohms/°C
B.mhos/ohm°C
C.ohms/ohm°C
D.mhos/°C

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] ohms/ohm°C [/bg_collapse]

Question 7: Which of the following materials has the least resistivity ?

A.Zinc
B.Lead
C.Mercury
D.Copper

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] Copper [/bg_collapse]

Question 8:When current flows through heater coil it glows but supply wiring does not glow because

A.current through supply line flows at slower speed
B.supply wiring is covered with in¬sulation layer
C.resistance of heater coil is more than the supply wires
D.supply wires are made of superior material

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] resistance of heater coil is more than the supply wires [/bg_collapse]

Question 9:The condition for the validity under Ohm’s law is that

A.resistance must be uniform
B.current should be proportional to the size of the resistance
C.resistance must be wire wound type
D.temperature at positive end should be more than the temperature at negative end

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] resistance must be uniform [/bg_collapse]

Question 10:Which of the following statement is correct ?

A.A semi-conductor is a material whose conductivity is same as be¬tween that of a
conductor and an insulator
B.A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator
C.A semi-conductor is one which con¬ducts only half of the applied voltage
D.A semi-conductor is a material made of alternate layers of conducting material and insulator

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] A semi-conductor is a material whose conductivity is same as be¬tween that of a
conductor and an insulator [/bg_collapse]

Question 11:A rheostat differs from potentiometer in the respect that it

A.has lower wattage rating
B.has higher wattage rating
C.has large number of turns
D.offers large number of tapping

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] has higher wattage rating [/bg_collapse]

Question 12:An open resistor, when checked with an ohm-meter reads

A.zero
B.infinite
C.high but within tolerance
D.low but not zero

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] infinite [/bg_collapse]

Question 13:_____ are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

A.Varistors
B.Thermistor
C.Semi-conductors
D.Variable resistors

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] Semi-conductors [/bg_collapse]

Question 14:All good conductors have high

A.conductance
B.resistance
C.reluctance
D.thermal conductivity

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] conductance [/bg_collapse]

Question 15:Voltage dependent resistors are usually made from

A.charcoal
B.silicon carbide
C.nichrome
D.graphite

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] silicon carbide [/bg_collapse]

Question 16:Voltage dependent resistors are used

A.for inductive circuits
B.to supress surges
C.as heating elements
D.as current stabilizers

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] to supress surges [/bg_collapse]

Question 17:The ratio of mass of proton to that of electron is nearly

A.1840
B.1640
C.30
D.4

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] 1840 [/bg_collapse]

Question 18:The number of electrons in the outer most orbit of carbon atom is
A.3
B.4
C.6
D.7

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Question 19:A thermistor has

A.positive temperature coefficient
B.negative temperature coefficient
C.zero temperature coefficient
D.variable temperature coefficient

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] negative temperature coefficient [/bg_collapse]

Question 20:If I, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to

A.I²Rt
B.I²Rf
C.I²R²t
D.IRt

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] I²Rt [/bg_collapse]

Question 21:Nichrome wire is an alloy of

A.lead and zinc
B.chromium and vanadium
C.nickel and chromium
D.copper and silver

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] nickel and chromium [/bg_collapse]

Question 22: When a voltage of one volt is applied, a circuit allows one-microampere current to flow through it. The conductance of the circuit is

A.1 n-mho
B.106 mho
C.1 milli-mho
D.none of these

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] 1 n-mho [/bg_collapse]

Question 23:Which of the following can have negative temperature coefficient ?

A.Compounds of silver
B.Liquid metals
C.Metallic alloys
D.Electrolytes

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Question 24:Conductance : mho ::

A.resistance : ohm
B.capacitance : henry
C.inductance : farad
D.lumen : steradian

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] resistance : ohm [/bg_collapse]

Question 25:1 angstrom is equal to

A.10⁻⁸ mm
B.10⁻⁶ cm
C.10⁻¹⁰ m
D.10¹⁰ m

[bg_collapse view=”button-orange” color=”#4a4949″ icon=”arrow” expand_text=”Show Answer” collapse_text=”Hide Answer” ] 10⁻¹⁰ m [/bg_collapse]

Answer-C