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Free download in PDF Ohms Law Multiple Choice 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.
(1)
Resistance of a wire is yΩ. The wire is stretched to triple its length, then the resistance becomes
[A]
y/3
[B]
3y
[C]
6y
[D]
y/6
(2)
An electric current of 10 A is the same as
[A]
10 J/C
[B]
10 V/C
[C]
10C/sec
[D]
10 W/sec
(3)
Which of the following bulbs will have high resistance?
[A]
220V, 60W
[B]
220V,100W
[C]
115V,60W
[D]
115V,100 W
(4)
Resistivity of a wire depends on
[A]
length of wire
[B]
cross section area
[C]
material
[D]
All of these
(5)
Which method can be used for absolute measurement of resistances ?
[A]
Ohm's law method
[B]
Wheatstone bridge method
[C]
Releigh method
[D]
All of these
Answer: Wheatstone bridge method
(6)
A wire of 0.14 mm diameter and specific resistance 9.6 micro ohm-cm is 440 cm long. The resistance of the wire will be
[A]
9.6 ohm
[B]
11.3 ohm
[C]
27.4 ohm
[D]
None Of The Above
(7)
A metal resistor has resistance of 10 ohm at 0°C and 11 ohms at 160°C, the temperature coefficient is
[A]
0.00625 / °C
[B]
0.0625 /°C
[C]
0.000625 /°C
[D]
None Of The Above
(8)
The current in 4 ohm resistor will be
[A]
2.1 A
[B]
2.7 A
[C]
3.0 A
[D]
3.5 A
(9)
A resistance of 5 ohms is further drawn so that its length becomes double. Its resistance will now be
[A]
5 ohms
[B]
7.5 ohms
[C]
10 ohms
[D]
20 ohms
(10)
Ohm's law is not applicable in all the following cases Except
[A]
Electrolytes
[B]
Arc lamps
[C]
Insulators
[D]
Vacuum ratio values
(11)
Which of the following material is not used as fuse material?
[A]
Silver
[B]
Copper
[C]
Aluminium
[D]
Carbon
(12)
Which of the following bulbs will have the least resistance ?
[A]
220 V, 60 W
[B]
220 V, 100 W
[C]
115 V, 100 W
[D]
None of the above
(13)
When P = Power, V = Voltage, I = Current, R = Resistance and G = Conductance, which of the following relation is incorrect?
[A]
V = √ (PR)
[B]
P= V2G
[C]
G= P / I2
[D]
I =√ (P / R)
(14)
Resistivity is usually expressed in terms of
[A]
mho
[B]
ohm / oC
[C]
ohms/cm-cube
[D]
All of these
(15)
Which material is expected to have least resistivity?
[A]
Copper
[B]
Lead
[C]
Mercury
[D]
Zinc
(16)
Low resistance can be accurately measured by
[A]
Kelvin bridge
[B]
Wheat stone bridge
[C]
Wein's bridge
[D]
None of the above
(17)
Which resistor will be physically larger in size ?
[A]
10 ohm, 50 W
[B]
100 ohm, 10 W
[C]
1 kohm, 1 W
[D]
10 Mohm, 1/ 2 W
(18)
A fuse is always installed in a circuit is
[A]
Series
[B]
Parallel
[C]
Both A and B
[D]
None of the above
(19)
Filaments of electric bulbs are usually made of
[A]
Nichrome
[B]
Tungsten
[C]
Copper
[D]
All Of These
(20)
A 100 W bulb is connected in series with a room heater of 750 W. What will happen if the bulb is replaced by a 60W bulb?
[A]
Heater output will increase
[B]
Heater output will decrease
[C]
Heater output will remain unchanged
[D]
None Of The Above
Answer: Heater output will decrease
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