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EEE : Ohms Law - Quiz(MCQ)
1 .
If a current of 5 Amperes flows through the conductor. The number of electrons per second will is
A)
3.12 x 1019
B)
1.6 x 10-19
C)
4 x 1019
D)
7.68 x 1020

Correct Answer :   3.12 x 1019

2 .
Ohm's law is true for
A)
Metallic conductors at high temperature
B)
Metallic conductors at low temperature
C)
For diode when current flows
D)
For electrolytes, when current passes through them

Correct Answer :   Metallic conductors at low temperature

3 .
An example of non-ohmic resistance is
A)
Diode
B)
Tungsten wire
C)
Copper wire
D)
Carbon resistance

Correct Answer :   Diode

4 .
How much current is produced by a voltage of 18 kV across a 15 kΩ resistance?
A)
1.2 A
B)
12 A
C)
12 mA
D)
120 mA

Correct Answer :   1.2 A

5 .
What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing?
A)
6.6 Ω
B)
18.3 Ω
C)
66 Ω
D)
183 Ω

Correct Answer :   183 Ω

6 .
Four amperes of current are measured through a 24 Ω resistor connected across a voltage source. How much voltage does the source produce?
A)
8 V
B)
9.6 V
C)
96 V
D)
960 V

Correct Answer :   96 V

7 .
The ampere is the unit of resistance.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   False

8 .
What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?
A)
8.2 kΩ
B)
8.2 Ω
C)
82 Ω
D)
820 Ω

Correct Answer :   82 Ω

9 .
A resistance of 3.3 MO is connected across a 500 V source. The resulting current is approximately
A)
15.1 µA
B)
66 mA
C)
151 µA
D)
660 mA

Correct Answer :  

10 .
An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately
A)
3.1 Ω
B)
31 Ω
C)
38.5 Ω
D)
385 Ω

Correct Answer :   31 Ω

11 .
A current of 200 µA through a 6.8 kΩ resistor produces a voltage drop of
A)
1.36 V
B)
13.6 V
C)
34.4 V
D)
340 V

Correct Answer :   1.36 V

12 .
A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.
A)
2 Ω
B)
4 Ω
C)
20 Ω
D)
40 Ω

Correct Answer :   20 Ω

13 .
When 12 V are applied across a 68 Ω resistor, the current is
A)
8.16 mA
B)
17.6 mA
C)
176 mA
D)
816 mA

Correct Answer :   176 mA

14 .
If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is
A)
2.2 kΩ
B)
22 kΩ
C)
220 kΩ
D)
220 Ω

Correct Answer :   2.2 kΩ

15 .
Ohm's law describes how current is related to voltage and resistance.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   True

16 .
Determines the relationship between current, resistance, and voltage.
A)
Bardeen, John (1816 AD)
B)
Shockley, William (1836 AD)
C)
Hans Christian is a German author (1846 AD)
D)
Ohm, Georg Simon (1826 AD)

Correct Answer :   Ohm, Georg Simon (1826 AD)

17 .
Current (I) is proportional to Resistance (R) according to Ohm's Law (R).
A)
Directly
B)
Indirectly
C)
Can Not Say
D)
None of the above

Correct Answer :   Indirectly

Explanation : as formula goes as V= IR

18 .
According to Ohm's Law, what is the current (I) when 500 Voltage (V) is supplied to a 2K Resistance (R)?
A)
0.25 Amp
B)
0.50 Amp
C)
0.75 Amp
D)
4 Amp

Correct Answer :   0.25 Amp

Explanation : V=IR is used to solve

19 .
Resistance of a wire is yΩ. The wire is stretched to triple its length, then the resistance becomes
A)
y/3
B)
y/6
C)
3y
D)
6y

Correct Answer :   3y

20 .
An electric current of 10 A is the same as
A)
10 J/C
B)
10C/sec
C)
10 V/C
D)
10 W/sec

Correct Answer :   10C/sec

21 .
Which of the following bulbs will have high resistance?
A)
115V,60W
B)
115V,100 W
C)
220V, 60W
D)
220V,100W

Correct Answer :   220V, 60W

22 .
In a conductor, if 6-coulomb charge flows for 2 seconds. The value of electric current will be
A)
2 volts
B)
2 amperes
C)
3 volts
D)
3 ampere

Correct Answer :   3 ampere

23 .
An EMF source of 8.0 V is connected to a purely resistive electrical appliance. An electric current of 2.0 A flows through it. What is the resistance offered by the electrical appliances?
A)
2 ohm
B)
3 ohm
C)
4 ohm
D)
6 ohm

Correct Answer :   4 ohm

24 .
A potential difference of 10 V is applied across a conductor whose resistance is 2.5 ohm. What is the value of current flowing through it?
A)
2 amperes
B)
4 amperes
C)
6 amperes
D)
10 amperes

Correct Answer :   4 amperes

25 .
If the conductor resistance is 50 ohm and the current passing through it is 5 A. What is the value of potential difference?
A)
15 V
B)
50 V
C)
150 V
D)
250 V

Correct Answer :   250 V

26 .
If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?
A)
3.2 V
B)
8 V
C)
32 V
D)
320 V

Correct Answer :   32 V

27 .
A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange and silver?
A)
2 mA
B)
2.2 mA
C)
21.4 mA
D)
214 mA

Correct Answer :   2.2 mA

28 .
Approximately how many milli-amperes of current flow through a circuit with a 40 V source and 6.8 kΩ of resistance?
A)
5.9 mA
B)
27.2 mA
C)
59 mA
D)
590 mA

Correct Answer :   5.9 mA

29 .
If 750 µA is flowing through 11 kΩ of resistance, what is the voltage drop across the resistor?
A)
8.25 V
B)
14.6 V
C)
82.5 V
D)
146 V

Correct Answer :   8.25 V

30 .
How much voltage is needed to produce 2.5 A of current through a 200 Ω resistor?
A)
8 V
B)
50 V
C)
80 V
D)
500 V

Correct Answer :   500 V

31 .
Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?
A)
4 Ω
B)
4 kΩ
C)
4.4 Ω
D)
400 Ω

Correct Answer :   4 kΩ

32 .
How much resistance is needed to draw 17.6 mA from a 12 volt source?
A)
6.8 kΩ
B)
68 Ω
C)
212 Ω
D)
680 Ω

Correct Answer :   680 Ω

33 .
When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is
A)
1.4 V
B)
10 V
C)
14.4 V
D)
100 V

Correct Answer :   14.4 V

34 .
You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
A)
0 V
B)
9 V
C)
18 V
D)
900 mV

Correct Answer :   9 V

35 .
What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?
A)
1.8 V
B)
7.2 V
C)
18 V
D)
72 V

Correct Answer :   72 V

36 .
The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately
A)
1.2 Ω
B)
11.2 Ω
C)
18 Ω
D)
112 Ω

Correct Answer :   112 Ω

37 .
How much resistance is required to limit the current from a 12 V battery to 3.6 mA?
A)
3.3 kΩ
B)
2.2 kΩ
C)
33 kΩ
D)
22 kΩ

Correct Answer :   3.3 kΩ

38 .
What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?
A)
9.7 Ω
B)
23 Ω
C)
97 Ω
D)
230 Ω

Correct Answer :   230 Ω

39 .
According to Ohm's Law
A)
V is inversely proportional to I
B)
V is directly proportional to I
C)
V is directly proportional to vI
D)
All of the above

Correct Answer :   V is directly proportional to I

40 .
Approximately how much current flows through a 3.3 MO resistor across a 30 V source?
A)
9 µA
B)
90 µA
C)
900 µA
D)
9000 µA

Correct Answer :   9 µA

41 .
1 milliampere equals-
A)
10A
B)
10µA
C)
100µA
D)
1000µA

Correct Answer :   1000µA

42 .
The Tungsten filament in a light bulb has a resistance of-
A)
Linear
B)
Non-Linear
C)
Fixed
D)
Both (A) and (B)

Correct Answer :   Non-Linear

43 .
The following are the most common non-linear resistor types:
A)
Thermistor Resistor
B)
Varistor Resistor
C)
Photo Resistor or LDR Resistor
D)
Both (A) and (B) are accurate.

Correct Answer :   Both (A) and (B) are accurate.

44 .
Conductance is expressed in-
A)
mho
B)
mho/m
C)
ohm/m
D)
m/ohm

Correct Answer :   mho

Explanation : The reciprocal of resistance is conductance, which is measured in mho.

45 .
The watt is an electric power unit named after Scottish inventor
A)
James Watt (1736–1819)
B)
Alexander Graham Bell (1847–1922)
C)
Otto Blathy (1860–1939)
D)
Walter Houser Brattain (1902–1987)

Correct Answer :   James Watt (1736–1819)

46 .
One horsepower is equivalent to
A)
576 watt
B)
646 watt
C)
746 watt
D)
796 watt

Correct Answer :   746 watt

47 .
The Power Formula is_______
A)
P = E/T
B)
P = W/T
C)
P = W/ΔT
D)
All of the above

Correct Answer :   All of the above

Explanation : where P is power,,W is work done and T is total time

48 .
The joule is the SI unit of work or energy, and it is named after an English scientist .
A)
Joule, James Prescott (1818–1889)
B)
James Watt (1736–1819) was an Englishman who lived from 1736 to 1819.
C)
Alexander Graham Bell (1847–1922) was an Englishman who lived from 1847 to 1922.
D)
Brattain, Walter Houser (1902–1987)

Correct Answer :   Joule, James Prescott (1818–1889)

49 .
Which method can be used for absolute measurement of resistances?
A)
Releigh method
B)
Ohm's law method
C)
Wheatstone bridge method
D)
All of the above

Correct Answer :   Wheatstone bridge method

50 .
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)
27.4 ohm
C)
11.3 ohm
D)
None of the above

Correct Answer :   27.4 ohm

51 .
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

Correct Answer :   20 ohms

52 .
Ohm's law is not applicable in all the following cases Except
A)
Arc lamps
B)
Electrolytes
C)
Insulators
D)
Vacuum ratio values

Correct Answer :   Insulators

53 .
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

Correct Answer :   115 V, 100 W

54 .
Low resistance can be accurately measured by
A)
Kelvin bridge
B)
Wein's bridge
C)
Wheat stone bridge
D)
None of the above

Correct Answer :   Kelvin bridge

55 .
Which resistor will be physically larger in size?
A)
1 kohm, 1 W
B)
10 ohm, 50 W
C)
10 Mohm, 1/ 2 W
D)
100 ohm, 10 W

Correct Answer :   10 ohm, 50 W

56 .
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

Correct Answer :   Heater output will decrease

57 .
When the length of the conductor is doubled and the area of cross-section remains the same then its resistance
A)
Will be doubled
B)
Will become half
C)
Remains the same
D)
Will increase by four times

Correct Answer :   Will be doubled

58 .
The current passing through a resistor in a circuit is 1 A when the voltage across the same resistor is 10 V. What is the value of current when the voltage across the resistor is 8 V
A)
0.8 A
B)
8 A
C)
18 A
D)
80 A

Correct Answer :   0.8 A

59 .
A lamp of 100 W at 200 V is supplied current at 100 volts. It will be equivalent to the lamp of
A)
10 W
B)
25 W
C)
40 W
D)
50 W

Correct Answer :   25 W

60 .
100 resistors of 100 ohms each arc connected in parallel. Their equivalent resistances will be
A)
1 ohm
B)
100 ohms
C)
10,000 ohms
D)
None of the above

Correct Answer :   10,000 ohms