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Quiz 3
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Q.1
Which of the following can have negative temperature coefficient?
Compounds of silver
Liquid metals
Metallic alloys
Electrolytes
Q.2
Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be
1 Q
2 Q
3 Q
4 Q
Q.3
When one leg of parallel circuit is opened out the total current will
Reduce
Increase
Decrease
Become zero
Q.4
All good conductors have high
Conductance
Resistance
Reluctance
Thermal conductivity
Q.5
What will be energy used by the battery if the battery has to drive 6.28 x 10¹⁸ electrons with potential difference of 20 V across the terminal ?
5 joules
10 joules
15 joules
20 joules
Q.6
Ohm's law is not applicable to
Semiconductors
D.C. circuits
Small resistors
High currents
Q.7
Switching of a lamp in house produces noise in the radio. This is because switching operation produces
Arcs across separating contacts
Mechanical noise of high intensity
Both mechanical noise and arc between contacts
None of the above
Q.8
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
Two in parallel
Two in parallel and one in series
Three in parallel
Three in series
Q.9
Which of the following materials has a negative temperature coefficient of resistance?
Copper
Aluminum
Carbon
Brass
Q.10
Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
Varistors
Thermistor
Semiconductors
Variable resistors
Q.11
In a series circuit with unequal resistances
The highest resistance has the most of the current through it
The lowest resistance has the highest voltage drop
The lowest resistance has the highest current
The highest resistance has the highest voltage drop
Q.12
Which one of the following does not have negative temperature coefficient?
Aluminium
Paper
Rubber
Mica
Q.13
Two resistors are said to be connected in series when
Same current passes in turn through both
Both carry the same value of current
Total current equals the sum of branch currents
Sum of IR drops equals the applied e.m.f.
Q.14
Resistance of a tungsten lamp as applied voltage increases
Decreases
Increases
Remains same
None of the above
Q.15
Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?
3/2 Q
6 Q
4 Q
8/3 Q
Q.16
Which is the best conductor of electricity?
Iron
Silver
Copper
Carbon
Q.17
Heat in a conductor is produced on the passage of electric current due to
reactance
capacitance
impedance
resistance
Q.18
Resistance of carbon filament lamp as the applied voltage increases.
Increases
Decreases
Remains same
None of the above
Q.19
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes
1/9 times
3 times
9 times
Unchanged
Q.20
Bulbs in street lighting are all connected in
Parallel
Series
Series-parallel
End-to-end
Q.21
Nichrome wire is an alloy of
Lead and zinc
Chromium and vanadium
Nickel and chromium
Copper and silver
Q.22
Resistance of 220 V, 100 W lamp will be
4.84 Q
48.4 Q
484 ft
4840 Q
Q.23
Which of the following materials has the least resistivity ?
Zinc
Lead
Mercury
Copper
Q.24
Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open
There will be heavy current in the main line
Rest of the two bulbs will not light
All three bulbs will light
The other two bulbs will light
Q.25
Which of the following material has nearly zero temperature coefficient of resistance?
Manganin
Porcelain
Carbon
Copper
Q.26
Conductance: mho ::
Resistance : ohm
Capacitance : Henry
Inductance : farad
lumen : steradian
Q.27
The resistance of a conductor varies inversely as
Length
Area of cross-section
Temperature
Resistivity
Q.28
A resistance having rating 10 ohms, 10 W is likely to be a
Metallic resistor
Carbon resistor
Wire wound resistor
Variable resistor
Q.29
An electric filament bulb can be worked from
D.C. supply only
A.C. supply only
Battery supply only
All above
Q.30
With rise in temperature the resistance of semiconductors
Decreases
Increases
First increases and then decreases
Remains constant
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