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Free download in PDF Ohms Law Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, AIIMS, NEET etc. These short solved questions or quizzes are provided by Gkseries.
(21)
For a fixed supply voltage the current flowing through a conductor will decrease when
[A]
cross-sectional area of the conductor is increased
[B]
length of the conductor is increased
[C]
length of the conductor is reduced
[D]
cross-sectional area is increased and length is decreased
Answer: length of the conductor is increased
(22)
A lamp of 100 W at 200 V is supplied current at 100 volts. It will be equivalent to the lamp of
[A]
50 W
[B]
40 W
[C]
25 W
[D]
10 W
(23)
When current flows through heater coil it glows but supply wiring does not glow because
[A]
supply wiring is covered with insulation layer
[B]
current through supply line flows at slower speed
[C]
supply wires arc made of superior material
[D]
resistance of heater coil is more than that supply wires
Answer: resistance of heater coil is more than that supply wires
(24)
Two electric bulbs of 100 W, 200 V are put in series and the combination is supplied 100 V. The power consumption of each bulb will be
[A]
100 / 2 W
[B]
100 / 4 W
[C]
100 / 16 W
[D]
All of these
(25)
Which of the following lamps will have least resistance at room temperature ?
[A]
200 W, 220 V
[B]
100 W, 220 V
[C]
60 W, 220 V
[D]
All of these
(26)
The value of supply voltage for 500 W ,5 ohm load is
[A]
500 V
[B]
100V
[C]
50 V
[D]
None Of The Above
(27)
100 resistors of 100 ohms each arc connected in parallel. Their equivalent resistances will be
[A]
10,000 ohms
[B]
100 ohms
[C]
1 ohm
[D]
None Of The Above
(28)
The ratio of the resistance of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be nearly
[A]
4
[B]
2
[C]
1 / 2
[D]
1 / 4
(29)
The current carrying capacity of the fuse material depends on
[A]
cross-sectional area
[B]
length
[C]
material
[D]
all of the above
(30)
Which material is expected to have least resistivity?
[A]
Copper
[B]
Lead
[C]
Mercury
[D]
Zinc
31
Consider a circuit with two unequal resistances in parallel, then
[A]
large current flows in large resistor
[B]
current is same in both
[C]
potential difference across each is same
[D]
smaller resistance has smaller conductance
Answer: potential difference across each is same
32
In which of the following cases is Ohm’s law not applicable?
[A]
Electrolytes
[B]
Arc lamps
[C]
Insulators
[D]
None of the above
33
A copper wire of length l and diameter d has potential difference V applied at its two ends. The drift velocity is V. If the diameter of wire is made d/4, then drift velocity becomes
[A]
V/16
[B]
16V
[C]
V
[D]
V/4)
34
Ohm’s law is not applicable to
[A]
dc circuits
[B]
high currents
[C]
semi-conductors
[D]
All of these
35
Conductance is expressed in terms of
[A]
mho
[B]
mho/m
[C]
ohm/m
[D]
m/ohm
36
In a current-voltage relationship graph of a linear resistor, the slope of the graph will indicate
[A]
conductance
[B]
resistance
[C]
resistivity
[D]
None of the above
37
How many different combinations may be obtained with three resistors, each having the resistance R ?
38
Ohm's law is not applicable to
[A]
DC circuits
[B]
high currents
[C]
semi-conductors
[D]
None of the above
39
Voltage between point P and Q will be
[A]
40 V
[B]
22.5 V
[C]
20 V
[D]
All Of These
40
Least current will flow through
[A]
25 ohm resistor
[B]
18 ohm resistor
[C]
10 ohm resistor
[D]
None Of The Above
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