# Current Electricity · Physics · NEET

Start Practice## MCQ (Single Correct Answer)

NEET 2024 (Re-Examination)

A uniform wire of diameter $$d$$ carries a current of $$100 \mathrm{~mA}$$ when the mean drift velocity of electrons in the wire is $$v$$. For a wire ...

NEET 2024 (Re-Examination)

A uniform metal wire of length $$l$$ has $$10 \Omega$$ resistance. Now this wire is stretched to a length $$2l$$ and then bent to form a perfect circl...

NEET 2024 (Re-Examination)

The given circuit shows a uniform straight wire $$A B$$ of $$40 \mathrm{~cm}$$ length fixed at both ends. In order to get zero reading in the galvanom...

NEET 2024

The terminal voltage of the battery, whose emf is $$10 \mathrm{~V}$$ and internal resistance $$1 \Omega$$, when connected through an external resistan...

NEET 2024

A wire of length '$$l$$' and resistance $$100 \Omega$$ is divided into 10 equal parts. The first 5 parts are connected in series while the next 5 part...

NEET 2024

Two heaters $$A$$ and $$B$$ have power rating of $$1 \mathrm{~kW}$$ and $$2 \mathrm{~kW}$$, respectively. Those two are first connected in series and ...

NEET 2024

Choose the correct circuit which can achieve the bridge balance.

NEET 2023 Manipur

A certain wire $$\mathrm{A}$$ has resistance $$81 ~\Omega$$. The resistance of another wire $$\mathrm{B}$$ of same material and equal length but of di...

NEET 2023 Manipur

A copper wire of radius $$1 \mathrm{~mm}$$ contains $$10^{22}$$ free electrons per cubic metre. The drift velocity for free electrons when $$10 \mathr...

NEET 2023 Manipur

The emf of a cell having internal resistance $$1 \Omega$$ is balanced against a length of $$330 \mathrm{~cm}$$ on a potentiometer wire. When an extern...

NEET 2023

The magnitude and direction of the current in the following circuit is :-
...

NEET 2023

If the galvanometer $$G$$ does not show any deflection in the circuit shown, the value of $$R$$ is given by:
...

NEET 2023

Resistance of a carbon resistor determined from colour codes is $$(22000 \pm 5 \%) \Omega$$. The colour of third band must be :

NEET 2023

The resistance of platinum wire at $$0^{\circ} \mathrm{C}$$ is $$2 ~\Omega$$ and $$6.8 ~\Omega$$ at $$80^{\circ} \mathrm{C}$$. The temperature coeffic...

NEET 2023

10 resistors, each of resistance $$\mathrm{R}$$ are connected in series to a battery of emf $$E$$ and negligible internal resistance. Then those are c...

NEET 2022 Phase 2

The reciprocal of resistance is :

NEET 2022 Phase 2

A cell of emf 4 V and internal resistance 0.5 $$\Omega$$ is connected to a 7.5 $$\Omega$$ external resistance. The terminal potential difference of th...

NEET 2022 Phase 2

The equivalent resistance of the infinite network given below is :
...

NEET 2022 Phase 2

The sliding contact C is at one fourth of the length of the potentiometer wire (AB) from A as shown in the circuit diagram. If the resistance of the w...

NEET 2022 Phase 1

Two resistors of resistance, 100 $$\Omega$$ and 200 $$\Omega$$ are connected in parallel in an electrical circuit. The ratio of the thermal energy dev...

NEET 2022 Phase 1

A copper wire of length 10 m and radius $$\left( {{{{{10}^{ - 2}}} \over {\sqrt \pi }}} \right)$$ m has electrical resistance of 10 $$\Omega$$. The c...

NEET 2022 Phase 1

A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most...

NEET 2021

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then...

NEET 2021

The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25$$...

NEET 2021

Column - I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some mathematical relations invo...

NEET 2021

Three resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. The ratio $${{{i_3}} \over {{i_1}}}$$ of currents in ter...

NEET 2020 Phase 1

A resistance wire connected in the left gap of a metre bridge balances a 10 $$\Omega $$
resistance in the right gap at a point which divides the brid...

NEET 2020 Phase 1

The color code of a resistance is given below : The values of resistance and tolerance, respectively, are...

NEET 2020 Phase 1

A charged particle having drift velocity 7.5$$ \times $$10-4 ms-1 in an electric field of 3$$ \times $$10-10 Vm-1 has a mobility in m2 V-1s-1 of :...

NEET 2020 Phase 1

Which of the following graph represents the variation of resistivity ($$\rho $$) with temperature (T) for copper?

NEET 2020 Phase 1

The solids which have the negative temperature coefficient of resistance are :

NEET 2019

Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resistance.
The ratio of power consumption by th...

NEET 2019

In the circuits shown below, the readings of voltmeters and the ammeters will be :
...

NEET 2019

Which of the following acts as a circuit protection device?

NEET 2018

A battery consists of a variable number n of
identical cells (having internal resistance r each)
which are connected in series. The terminals
of the b...

NEET 2018

A carbon resistor of (47 $$ \pm $$ 4.7) k$$\Omega $$ is to be marked
with rings of different colours for its identification.
The colour code sequence ...

NEET 2018

A set of n equal resistors, of value R each, are
connected in series to a battery of emf E and
internal resistance R. The current drawn is I. Now,
the...

NEET 2017

The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length. its new resistance will be

NEET 2017

A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves

NEET 2016 Phase 2

The potential difference (VA $$-$$ VB) between the points A and B in the given figure is
...

NEET 2016 Phase 2

A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consu...

NEET 2016 Phase 1

A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support on...

NEET 2016 Phase 1

The charge flowing through a resistance R varies with time t is Q = at $$-$$ bt2, where $$a$$ and $$b$$ are positive constants. The total heat produce...

AIPMT 2015

Two metal wires of identical dimensions are connected in series. If $$\sigma $$1 and $$\sigma $$2 are the conductivity of the combination is ...

AIPMT 2015

A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm ...

AIPMT 2015

A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E0 and a resistance r1. An unknown e.m.f. E is ba...

AIPMT 2015 Cancelled Paper

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the con...

AIPMT 2015 Cancelled Paper

A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y...

AIPMT 2015 Cancelled Paper

A potentiometer wire has length 4 m and resistance 8 $$\Omega $$. The resistance that must be connected in series with the wire and an accumulator of ...

AIPMT 2014

The resistances in the two arms of the meter bridge are 5 $$\Omega $$ and R$$\Omega $$ respectively. When the resistance R is shunted with an equal re...

AIPMT 2014

A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has...

AIPMT 2014

Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and t...

NEET 2013 (Karnataka)

Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm2. Each is 1 meter long. One rod is of copper with a resistivity ...

NEET 2013 (Karnataka)

A 12 cm wire is given a shape of a right angled triangle ABC having sides 3 cm, 4 cm and 5 cm as shown in the figure. The resistance between two ends ...

NEET 2013 (Karnataka)

Ten identical cells connected in series are needed to heat a wire of length one meter and radius 'r' by 10oC in time 't'. How many cells will be requi...

NEET 2013

The resistances of the four arms P, Q, R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal r...

NEET 2013

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 $$\Omega $$ is

NEET 2013

A wire of resistance 4 $$\Omega $$ is stretched to twice its original length. The resistance of stretched wire would be

AIPMT 2012 Mains

A cell having an emf $$\varepsilon $$ and internal resistance r is connected across a variable external resistance R. As the resistance R is increased...

AIPMT 2012 Mains

The power dissipated in the circuit shown in the figure is 30 watts. The value of R is
...

AIPMT 2012 Prelims

In the circuit shown the cells A and B have negligible resistances. For VA = 12 V, R1 = 500 $$\Omega $$ and R = 100 $$\Omega $$ the galvanometer (G) ...

AIPMT 2012 Prelims

A ring is made of a wire having a resistance R0 = 12 $$\Omega $$. Find the points A and B, as shown in the figure, at which a current carrying conduct...

AIPMT 2012 Prelims

If voltage across a bulb rated 220 volt-100 watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease...

AIPMT 2011 Mains

In the circuit shown in the figure, if the potential at point A is taken to be zero, the potential at point B is
...

AIPMT 2011 Mains

A thermocouple of negligible resistance
produces an e.m.f. of 40 µV/ºC in the linear range
of temperature. A galvanometer of resistance 10
ohm whose s...

AIPMT 2011 Prelims

A current of 2 A flows through a 2 $$\Omega $$ resistor when connected across a battery a 2 $$\Omega $$ resistor when connected across a battery. The ...

AIPMT 2011 Prelims

If power dissipated in the 9 $$\Omega $$ resistor in the circuit shown is 36 watt, the potential difference across the 2 $$\Omega $$ resistor is
...

AIPMT 2010 Prelims

Consider the following two statements.
(A) Kirchoff's junction law follows from the conservation of charge.
(B) Kirchhoff's lo...

AIPMT 2010 Prelims

A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is k volt/cm and the ammeter, present in the circui...

AIPMT 2009

See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ?
...

AIPMT 2009

A wire of resistance 12 ohms per meter is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points...

AIPMT 2009

The mean free path of electrons in a metal is 4 $$ \times $$ 10$$-$$8 m. The electric field which can give on an average 2 eV energy to an electron in...

AIPMT 2009

A student measures the terminal potential difference (V) of a cell (of emf $$\varepsilon $$ and internal resistance r) as a function of the current (I...

AIPMT 2008

In the circuit shown, the current through the 4 $$\Omega $$ resistor is 1 amp when the points P and M are connected to a d.c. voltage source. The pot...

AIPMT 2008

A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively

AIPMT 2008

A current of 3 amp. flows through the 2 $$\Omega $$ resistor shown in the circuit. The power dissipated in the 5 $$\Omega $$ resistor is
...

AIPMT 2008

A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of 10...

AIPMT 2008

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20oC ? The temperature of boiling wat...

AIPMT 2007

The total power dissipated in watt in the circuit shown here is
...

AIPMT 2007

Three resistances, P, Q, R each of 2$$\Omega $$ and an unknown resistance S from the four arms of a Wheatstone bridge circuit. When a resistance of 6 ...

AIPMT 2006

In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will
...

AIPMT 2006

Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r1 and r2 (r1 > r2) res...

AIPMT 2006

Kirchoff's first and second laws of electrical circuits are consequences of

AIPMT 2006

Power dissipated across the 8 $$\Omega $$ resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the 3 $$\Omega $$ re...

AIPMT 2005

Two batteries, one of emf 18 volts and internal resistance 2 $$\Omega $$ and the other of emf 12 volts and internal resistance 1 $$\Omega $$, are conn...

AIPMT 2005

A 5-ampere fuse wire can withstand a maximum power of 1 watt in the circuit. The resistance of the fuse wire is

AIPMT 2005

For the network shown in the figure the value of the current $$i$$ is
...

AIPMT 2005

When a wire of uniform cross-section $$a$$ length $$l$$ and resistance R is bent into a complete circle. resistance between any two of diametrically o...

AIPMT 2004

Five equal resistances each of resistances R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flow...

AIPMT 2004

when three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

AIPMT 2004

A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100 ohm. The difference of potential...

AIPMT 2004

In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, th...

AIPMT 2004

Resistance n, each of r ohm, when connected in parallel give an equivalent resistance of R ohm. If these resistances were connected in series, the co...

AIPMT 2004

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then

AIPMT 2003

Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply lin...

AIPMT 2003

An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in 10 minutes. When the ...

AIPMT 2003

Fuse wire is a wire of

AIPMT 2003

In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of ...

AIPMT 2002

For a cell terminal potential difference is 2.2V when circuit is open and reduce to 1.8 V when cell is connected to a resistance of R = 5 $$\Omega $$....

AIPMT 2002

Specific resistance of a conductor increases with

AIPMT 2001

Copper and silicon is cooled from 300 K to 60 K , the specific resistance

AIPMT 2001

The resistance of each arm of the Wheatstone's bridge is 10 ohm. A resistance of 10 ohm is connected in series with a galvanometer then the equivalent...

AIPMT 2001

If specific resistance of a potentiometer wire is 10-7$$\Omega $$ m and current flow through it is 0.1 amp., cross-sectional area of wire is 10$$-$$6 ...

AIPMT 2000

Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistances

AIPMT 2000

The net resistance of the circuit between A and B is
...

AIPMT 2000

A car battery of emf 12 V and internal resistance $$5 \times {10^{ - 2}}$$ $$\Omega $$., receives a current of 60 amp, from external source, then term...

AIPMT 2000

The potentiometer is best for measuring voltage, as