Ohms Law MCQs | Ohms Law Multiple Choice Questions and Answers

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Questions
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

Answer: 3y
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

Answer: 10C/sec
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3 Which of the following bulbs will have high resistance?
A 220V, 60W
B 220V,100W
C 115V,60W
D 115V,100 W

Answer: 220V, 60W
4 Resistivity of a wire depends on
A length of wire
B cross section area
C material
D All of these

Answer: material
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

Answer: 27.4 ohm.
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

Answer: 0.000625 /°C
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

Answer: 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

Answer: 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

Answer: Insulators
11 Which of the following material is not used as fuse material?
A Silver
B Copper
C Aluminium
D Carbon

Answer: 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

Answer: 115 V, 100 W.
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)

Answer: G= P / I2
14 Resistivity is usually expressed in terms of
A mho
B ohm / oC
C ohms/cm-cube
D All of these

Answer: ohms/cm-cube
15 Which material is expected to have least resistivity?
A Copper
B Lead
C Mercury
D Zinc

Answer: Copper
16 Low resistance can be accurately measured by
A Kelvin bridge
B Wheat stone bridge
C Wein's bridge
D None of the above

Answer: Kelvin bridge
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

Answer: 10 ohm, 50 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

Answer: Series
19 Filaments of electric bulbs are usually made of
A Nichrome
B Tungsten
C Copper
D All Of These

Answer: Tungsten
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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