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Current Electricity MCQs for NEET

Current Electricity physics

Objective type questions on Electric Current, Ohm’s Law, Resistance, Kirchhoff’s Law, Measuring Instruments and current electricity with answers.

Electric Current Physics

Question 1
It is easier to start  a car engine on a hot day than on a cold day. This is because the internal resistance of the car battery
A
Increases with rise in temperature
B
Decreases with rise in temperature
C
Does not change with a change in temperature
D
Decreases with a fall in temperature
Question 2
A uniform wire of resistance 9 ohm is cut into 3 equal parts.  They are connected in the form of equilateral triangle ABC.  A cell of e.m.f. 2 V and negligible internal resistance is connected across B and C.  Potential difference across AB is
A
3 V
B
1 V
C
0.5 V
D
2 V
Question 3
By increasing the temperature, the specific resistance of a conductor and a semiconductor
A
Increases for both
B
Increases, decreases
C
Decreases, increases
D
Decreases for both
Question 4
Current provided by a battery is maximum when
A
None of these
B
Internal resistance equal to external resistance
C
Internal resistance is greater than external resistance
D
Internal resistance is less than external resistance
Question 5
For driving a current of 2 A for 6 minutes in a circuit, 1000 J of work is to be done.  The e.m.f. of the source in the circuit is
A
1.38 V
B
3.10 V
C
2.04 V
D
1.68 V
Question 6
An ammeter whose resistance is 180 ohm gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is
A
10
B
20
C
18
D
0.1
Question 7
An energy source will supply a constant current into the load if its internal resistance is
A
Very large as compared to the load resistance
B
Equal to the resistance of the load
C
Zero
D
Non-zero but less than the resistance of the load
Question 8
Potential gradient is defined as

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A
Potential at any one end of the wire
B
Fall of potential between two ends of the wire
C
Fall of potential per unit area of the wire
D
Fall of potential per unit length of the wire
Question 9
A potentiometer having the potential gradient of 2 mV /cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)
A
2
B
1
C
5
D
10
Question 10
If a 0.1 % increase in length due to stretching, the percentage increase in its resistance will be
A
0.1 %
B
0.2 %
C
1 %
D
2 %
Question 11
The length of the wire is doubled. Its conductance will be
A
Unchanged
B
Quadrupled
C
Halved
D
1/4 of the original value
Question 12
The internal resistance of a cell depends on

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A
The area of the plates immersed
B
The concentration of the electrolyte
C
All the these
D
The distance between the plates
Question 13
The resistivity of a wire depends on its

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A
Area of cross-section
B
Material
C
Length
D
Shape
Question 14
The tangent galvanometer, when connected in series with a standard resistance can be used as
A
An ammeter
B
A voltmeter
C
Both an ammeter and a voltmeter
D
A wattmeter
Question 15
A torch battery consisting of two cells of 1.45 volts and an internal resistance 0.15 ohm, each cell sending currents through the filament of the lamps having resistance 1.5ohms. The value of current will be
A
16.11 amp
B
1.611 amp
C
0.1611 amp
D
2.6 amp
Question 16
The reciprocal of resistance is
A
Voltage
B
Resistivity
C
None of these
D
Conductance
Question 17
Which is a wrong statement
A
The rheostat can be used as a potential divider
B
Kirchhoff's first law (for currents meeting at a junction in an electric circuit) expresses the conservation of charge
C
The Wheatstone bridge is most sensitive when all the four resistances are of the same order
D
In a balanced Wheatstone bridge, interchanging the positions of galvanometer and cell affects the balance of the bridge
Question 18
A galvanometer can be converted into an ammeter by connecting
A
Low resistance in parallel
B
High resistance in series
C
High resistance in parallel
D
Low resistance in series
Question 19
The material of wire of potentiometer is

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A
Copper
B
Manganin
C
Aluminium
D
Steel
Question 20
The resistance of a conductor is 5 ohm at 50oC and 6 ohm at 100oC.  Its resistance at  0oC is
A
1 ohm
B
4 ohm
C
3 ohm
D
2 ohm
Question 21
A copper wire of resistance R is cut into ten parts of equal length. Two pieces each are joined in series and then five such combinations are joined in parallel. The new combination will have a resistance
A
R/5
B
R/25
C
R
D
R/4
Question 22
Resistance in the two gaps of a meter bridge are 10 ohm and 30 ohm respectively. If the resistances are interchanged the balance point shifts by
A
66.67cm
B
50 cm
C
33.3 cm
D
25 cm
Question 23
A potentiometer consists of a wire of length 4 m and resistance 10 ohm. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be
A
0.5 V/m
B
10 V/m
C
2 V/m
D
5 V/m
Question 24
A wire of resistance R is divided in 10 equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be
A
0.01 R
B
10 R
C
0.1 R
D
100 R
Question 25
The equivalent resistance of resistors connected in series is always

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A
Equal to sum of component resistors
B
Equal to the mean of component resistors
C
In between the lowest and the highest of component resistors
D
Less than the lowest of component resistors
Question 26
A piece of wire of resistance 4 ohms is bent through 180o at its mid point and the two halves are twisted together, then the resistance is
A
1 ohm
B
8 ohms
C
5 ohms
D
2 ohms
Question 27
By a cell a current of 0.9 A flows through 2 ohm resistor and 0.3 A through 7 ohm resistor. The internal resistance of the cell is
A
1.2 ohm
B
0.5 ohm
C
2.0 ohm
D
1.0 ohm
Question 28
If resistance of voltmeter is 10000 ohm and resistance of ammeter is 2 ohm then find R when voltmeter reads 12V and ammeter reads 0.1 A
A
124 ohm
B
120 ohm
C
114 ohm
D
118 ohm
Question 29
The current in a simple series circuit is 5.0 amp. When an additional resistance of 2.0 ohms is inserted, the current drops to 4.0 amp. The original resistance of the circuit in ohms was
A
20
B
10
C
8
D
1.25
There are 29 questions to complete.
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Vishal Arora

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