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31 Years NEET Previous Year Questions: Current Electricity - NEET MCQ


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65 Questions MCQ Test - 31 Years NEET Previous Year Questions: Current Electricity

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31 Years NEET Previous Year Questions: Current Electricity - Question 1

In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will [2006]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 1

Current will flow from B to A

Potential drop over the resistance CA will be
more due to higher value of resistance. So
potential at A will be less as compared with at
B. Hence, current will flow from B to A.

31 Years NEET Previous Year Questions: Current Electricity - Question 2

Kirchhoff’s first and second laws for electricalcircuits are consequences of [2006]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 2

Kirchhoff ' s first law deals with conservation
of electrical charge & the second law deals
with conservation of electrical energy.

31 Years NEET Previous Year Questions: Current Electricity - Question 3

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) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is [2006

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 3

Current in the circuit

P.D. across first cell = E – ir1

31 Years NEET Previous Year Questions: Current Electricity - Question 4

The total power dissipated in watts in the circuit shown here is [2007]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 4

The resistance of 6Ω and 3Ω are in parallel in the given circuit, their equivalent resistance is

31 Years NEET Previous Year Questions: Current Electricity - Question 5

Three resistances P, Q, R each of 2 Ω  and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6 Ω is connected in parallel to S the bridge gets balanced. What is the value of S?

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 5

For a balanced Wheatstone bridge, we get

Therefore, the equivalent circuit diagram drawn below. 

31 Years NEET Previous Year Questions: Current Electricity - Question 6

The resistance of an ammeter is 13 Ω and itsscale is graduated for a current upto 100 amps.After an additional shunt has been connectedto this ammeter it becomes possible to measurecurrents upto 750 amperes by this meter. Thevalue of shunt-resistance is [2007]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 6

We know

31 Years NEET Previous Year Questions: Current Electricity - Question 7

A steady current of 1.5 amp flows through acopper voltameter for 10 minutes. If the electrochemical equivalent of copper is30 × 10–5 g coulomb–1, the mass of copperdeposited on the electrode will be [2007]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 7

We have, m = ZIt
where, Z is the electrochemical equivalent
of copper.
⇒ m = 30 x10-5 x1.5 x10 x 60
= 0.27 gm.

31 Years NEET Previous Year Questions: Current Electricity - Question 8

A current of 3 amp flows through the 2Ω resistor shown in the circuit. The power dissipated in the 5-Ω resistor is: [2008]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 8

Clearly, 2Ω, 4Ω and ( 1 + 5) Ωresistors are
in parallel. Hence, potential difference is
same across each of them.
∴ I1 × 2 = I2 × 4 = I3 × 6

Given I1 = 3A ∴ I1 × 2 = I3 × 6
Given I1 = 3A.
∴ I1 × 2 = I3 × 6 provides

Now, the potential across the 5Ω resistor is
V = I3 × 5 = 1 × 5 = 5V.
∴ the power dissipated in the 5Ωresistor

31 Years NEET Previous Year Questions: Current Electricity - Question 9

A wire of a certain material is stretched slowlyby ten per cent. Its new resistance and specificresistance become respectively: [2008]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 9

In stretching, specific resistance remains unchanged.
After stretching, specific resistance (rho) will remain same.
Original resistance of the wire,

31 Years NEET Previous Year Questions: Current Electricity - Question 10

A cell can be balanced against 110 cm and 100cm of potentiometer wire, respectively with andwithout being short circuited through aresistance of 10Ω. Its internal resistance is [2008]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 10

Here   hence the lengths 110 cm
and 100 cm are interchanged.
Without being short-circuited through R,
only the battery E is balanced.

 

When R is connected across E, Ri, V/L, l2

Dividing (i) by (ii), we get

or, 100 R + 100 r = 110 R
or, 10 R = 100 r

31 Years NEET Previous Year Questions: Current Electricity - Question 11

A galvanometer of resistance 50 Ω is connectedto battery of 3V along with a resistance of 2950 Ωin series. A full scale deflection of 30 divisions isobtained in the galvanometer. In order to reducethis deflection to 20 divisions, the resistance inseries should be [2008]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 11

Total internal resistance = (50+2950)Ω
= 3000 Ω
Emf of the cell, ε = 3V

Current for full scale deflection of 30
divisions is 1.0 mA.
∴ Current for a deflection of 20 divisions

Let the resistance be x Ω. Then

= 4500 Ω
But the resistance of the galvanometer
is 50Ω
∴ Resistance to be added
= (4500 –50) Ω= 4450 Ω

 

31 Years NEET Previous Year Questions: Current Electricity - Question 12

See the electric circuit shown in the figure.

Which of the following equations is a correct equation for it? [2009]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 12

Applying Kirchhoff ’s rule in loop abcfa
ε1 – (i1 + i2) R – i1 r1 = 0.

31 Years NEET Previous Year Questions: Current Electricity - Question 13

A wire of resistance 12 Ωm-1 is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite point, A and B as shown in the figure, is [2009]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 13

Total resistance of wire = 12Ω×2π×10−1
= 2.4π
Resistance of each half = 2.4π/2​=1.2π
and as about diameter both parts are in parallel
Req. = 1.2π/2​=0.6πΩ
The correct answer is option D.
 

31 Years NEET Previous Year Questions: Current Electricity - Question 14

A student measures the terminal potentialdifference (V) of a cell (of emf E and internalresistance r) as a function of the current (I)flowing through it. The slope and intercept, ofthe graph between V and I, then, respectively,equal: [2009]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 14

The terminal potential difference of a cell is
given by V + Ir = E

V= VA – VB
or V = E – Ir

 Also for, i = 0 then V = E

∴ slope = – r, intercept = E

31 Years NEET Previous Year Questions: Current Electricity - Question 15

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 circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths ℓ1 cm and ℓ2 cm respectively. The magnitudes, of the resistors R and X, in ohms, are then, equal, respectively, to             [2010]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 15

(i) When key between the terminals 1
and 2 is plugged in,
P.D. across R = IR = k l1
⇒ R = k l1 as I = 1A
(ii) When key between terminals 1 and 3 is
plugged in,
P.D. across (X + R) = I(X + R) = k l2
⇒ X + R = k l2
∴ X = k (l2 – l1)
∴ R = kl1 and X = k (l2 – l1)

31 Years NEET Previous Year Questions: Current Electricity - Question 16

In producing chlorine by electrolysis 100 kWpower at 125 V is being consumed. How muchchlorine per minute is liberated? (E.C.E. ofchlorine is 0.367×10–6 kg / C) [2010]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 16

Power = 100KW
Voltage = 125V
Power = Vi
100×103 = 125i
i = 100000/125
i = 800A
We know that first law of electrolysis 
m = Zit (Z = E.C.E)
= 0.367/1000×10-6×800×60
= 367×48×10-6
= 17616×106 kg
= 17.6×10-3 kg

31 Years NEET Previous Year Questions: Current Electricity - Question 17

Consider the following two statements:
(a) Kirchhoff's junction law follows from the conservation of charge.
(b) Kirchhoff's loop law follows from the conservation of energy.

Which of the following is correct? [2010]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 17

Junction law follows from conservation
of charge and loop law is the conservation
of energy

31 Years NEET Previous Year Questions: Current Electricity - Question 18

The thermo e.m.f E in volts of a certain thermocouple is found to vary with temperature difference θ in °C between the two junctions according to the relation

The neutral temperature for the thermocouplewill be

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 18

For neutral temperature, 

Hence, neutral temperature is 225°C.

31 Years NEET Previous Year Questions: Current Electricity - Question 19

A current of 2A flows through a 2Ω resistorwhen connected across a battery. The samebattery supplies a current of 0.5 A whenconnected across a 9Ω resistor. The internalresistance of the battery is [2011]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 19

Let the internal resistance of the battery be
r. Then the current flowing through the
circuit is given by

⇒ 1.5 r  = 0.5 ⇒ r = 1/3Ω

31 Years NEET Previous Year Questions: Current Electricity - Question 20

If power dissipated in the 9-Ω resistor in the circuit shown is 36 watt, the potential difference across the 2-Ω resistor is [2011]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 20

We have, 

Current passing through the 9Ω resistor is

The 9Ω and 6Ω resistors are in parallel,
therefore

where i is the current delivered by the
battery.

Thus, potential difference across 2Ω
resistor is
V = iR
= 5 × 2
= 10V

31 Years NEET Previous Year Questions: Current Electricity - Question 21

The rate of increase of thermo–e.m.f. withtemperature at the neutral temperature of athermocouple [2011]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 21

We have,

At neutral temperature,

31 Years NEET Previous Year Questions: Current Electricity - Question 22

A thermocouple of negligible resistanceproduces an e.m.f. of 40 μV/°C in the linear rangeof temperature. A galvanometer of resistance 10ohm whose sensitivity is 1μA/div, is employedwith the termocouple. The smallest value oftemperature difference that can be detected bythe system will be [2011M]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 22

31 Years NEET Previous Year Questions: Current Electricity - Question 23

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

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 23

Current from D to C = 1A
∴ VD – VC = 2 × 1 = 2V
VA = 0     ∴ VC = 1V, ∴ VD – VC = 2
⇒VD – 1 = 2     ∴ VD = 3V
∴ VD – VB = 2 ∴ 3 – VB = 2 ∴ VB = 1V

31 Years NEET Previous Year Questions: Current Electricity - Question 24

A milli voltmeter of 25 milli volt range is to beconverted into an ammeter of 25 ampere range.The value (in ohm) of necessary shunt will be :[2012]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 24

Galvanometer is converted into ammeter,
by connected a shunt, in parallel with it.

Here S << G so
S = 0.001 Ω

31 Years NEET Previous Year Questions: Current Electricity - Question 25

In the circuit shown the cells A and B have negligible resistances. For VA = 12V, R1 = 500Ω and R = 100Ω the galvanometer (G) shows no deflection. The value of VB is : [2012]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 25

Since deflection in galvanometer is zero so
current will flow as shown in the above
diagram.

31 Years NEET Previous Year Questions: Current Electricity - Question 26

If voltage across a bulb rated 220 Volt-100 Wattdrops by 2.5% of its rated value, the percentageof the rated value by which the power woulddecrease is : [2012]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 26

Resistance of bulb is constant

31 Years NEET Previous Year Questions: Current Electricity - Question 27

A ring is made of a wire having a resistance R0 = 12 Ω. Find the points A and B as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub-circuit between these points is equal to 8/3 Ω

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 27

Let x is the resistance per unit length then

(y2 + 1 + 2y) ×  8/36 y  (where  y l1/l2

31 Years NEET Previous Year Questions: Current Electricity - Question 28

The power dissipated in the circuit shown in the figure is 30 Watts. The value of R is: [2012M]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 28

The power dissipated in the circuit

v = 10 volt

Substituting the values in equation (i)

31 Years NEET Previous Year Questions: Current Electricity - Question 29

Cell having an emf ε and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by : [2012M]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 29

The current through the resistance R

The potential difference across R

Thus V increases as R increases upto certain
limit, but it does not increase further.

31 Years NEET Previous Year Questions: Current Electricity - Question 30

A wire of resistance 4 Ω is stretched to twice itsoriginal length. The resistance of stretched wirewould be [NEET 2013]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 30

Therefore the resistance of new wire
becomes 16 Ω

31 Years NEET Previous Year Questions: Current Electricity - Question 31

The internal resistance of a 2.1 V cell which givesa current of 0.2 A through a resistance of 10 Ω is[NEET 2013]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 31

Given : emf ε = 2.1 V
I = 0.2 A, R = 10Ω
Internal resistance r = ?
From formula.
ε – Ir = V = IR
2.1 – 0.2r = 0.2 × 10
2.1 – 0.2 r = 2 or 0.2 r = 0.1

⇒ 2.1 = 0.2r +2 ⇒ r = 1/2 = 0.5Ω

31 Years NEET Previous Year Questions: Current Electricity - Question 32

The resistance 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 resistance of the cell are 7 volt and 5 ohmrespectively. If the galvanometer resistance is50 ohm, the current drawn from the cell will be [NEET 2013]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 32

Given : V = 7 V
r = 5Ω

31 Years NEET Previous Year Questions: Current Electricity - Question 33

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 (AB, BC, CA) of the respective sides are measured one by one by a multi-meter. The resistances will be in the ratio of    [NEET Kar. 2013]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 33

Resistance is directly proportional to length

∴ RAB : RBC : RAC = 27 : 32 : 35

31 Years NEET Previous Year Questions: Current Electricity - Question 34

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 of 1.7 × 10–6 ohm-centimeter, the other is of iron with a resistivity of 10–5 ohmcentimeter.     [NEET Kar. 2013]


How much voltage is required to produce a current of 1 ampere in the rods?

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 34

Copper rod and iron rod are joined in series.

From ohm’s law V = RI

= (1.7 × 10–6 × 10–2 + 10–5 × 10–2) ÷ 0.01 × 10–4 volt
= 0.117 volt ( I = 1A)

31 Years NEET Previous Year Questions: Current Electricity - Question 35

Ten identical cells connected in series areneeded to heat a wire of length one meter andradius ‘r’ by 10ºC in time ‘t’. How many cells willbe required to heat the wire of length two meterof the same radius by the same temperature intime ‘t’? [NEET Kar. 2013]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 35

Resistance is directly proportionl to length
of the wire. As length is doubled so mass is
doubled and resistance is doubled.
We have

31 Years NEET Previous Year Questions: Current Electricity - Question 36

In a metre-bridge, the balancing length from theleft end when standard resistance of 1 Ω is inright gap is found to be 20 cm. The value ofunknown resistance is [1999]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 36

Let unknown resistance be X. Then
condition of Wheatstone's bridge gives  where r is resistance of wire
per cm.

31 Years NEET Previous Year Questions: Current Electricity - Question 37

Two electric bulbs, one of 200 V, 40W and otherof 200 V, 100W are connected in a domesticcircuit. Then [2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 37

∴ R1 (for 40W) > R2 (for 100 W)

31 Years NEET Previous Year Questions: Current Electricity - Question 38

In electrolysis, the amount of mass deposited orliberated at an electrode is directly proportionalto [2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 38

By Faraday's Ist Law
Amount deposited (m) = Zit = Zq
m ∝ q
Amount deposited is directly proportional
to charge.

31 Years NEET Previous Year Questions: Current Electricity - Question 39

Potentiometer measures potential moreaccurately because [2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 39

Potentiometer measures potential current
more accurately because it measure potential
in open circuit and hence error in potential
due to internal resistance is removed.

31 Years NEET Previous Year Questions: Current Electricity - Question 40

Five resistances have been connected as shown in the figure. The effective resistance between A and B is

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 40

It is a balanced wheatstone bridge    , so the 7Ω resistance is
ineffective.
Equivalent resistance of 3Ω and 4Ω = 3 + 4
= 7Ω (series)
Equivalent resistance of 6Ω and 8Ω = 6 + 8
=14Ω (series)
Equivalent resistance of 7Ω and 14Ω (parallel)

31 Years NEET Previous Year Questions: Current Electricity - Question 41

A car battery has e.m.f. 12 volt and internalresistance 5 × 10–2 ohm. If it draws 60 amp current,the terminal voltage of the battery will be   [2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 41

31 Years NEET Previous Year Questions: Current Electricity - Question 42

Si and Cu are cooled to a temperature of 300 K,then resistivity? [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 42

For metals specific resistance decrease with decrease in temperature where as for semiconductors specific resistance increases with decrease in temperature.

31 Years NEET Previous Year Questions: Current Electricity - Question 43

If 25W, 220 V and 100 W, 220 V bulbs areconnected in series across a 440 V line, then    [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 43

As for an electric appliance R = (Vs2 /W) ,
so for same specified voltage Vs

i.e, R25 = 4R with R100 = R
Now in series potential divides in proportion
to resistance.

From this, it is clear that voltage across 100
W bulb (= 88 V) is lesser than specified
(220 V) while across 25 W bulb (= 352 V) is
greater than specified (220 V), so, 25 W bulb
will fuse.

31 Years NEET Previous Year Questions: Current Electricity - Question 44

A battery of 10 V and internal resistance 0.5Ω isconnected across a variable resistance R. Thevalue of R for which the power delivered ismaximum is equal to [1992, 2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 44

Power is maximum when r = R, R = r = 0.5Ω.

31 Years NEET Previous Year Questions: Current Electricity - Question 45

A wire has a resistance of 3.1Ω at 30ºC and aresistance 4.5Ω at 100ºC. The temperaturecoefficient of resistance of the wire [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 45

R1 = 3.1 Ω at t = 30°C
R2 = 4.5 Ω at t = 100°C
We have, R = R0 (1 + αt)
∴ R1 = R0 [1 + α (30)]
R2 = R0 [1 + α (100)]

31 Years NEET Previous Year Questions: Current Electricity - Question 46

If specific resistance of a potentiometer wire is10–7 Ωm, the current flow through it is 0.1 A andthe cross-sectional area of wire is 10–6 m2 thenpotential gradient will be [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 46

Potential gradient = Potential fall per unit
length. In this case resistance of unit length.

Potential fall across R is

V = I.R = 0.1x10-1 = 0.01 volt/m.
= 10-2 volt /m

31 Years NEET Previous Year Questions: Current Electricity - Question 47

The resistivity (specific resistance) of a copperwire [2002]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 47

Resistivity of copper wire increases with
increase in temprature as ρt = ρ0 (1+ αt)
Copper being a metal has positive coefficient
of resistivity.

31 Years NEET Previous Year Questions: Current Electricity - Question 48

The potential difference between the terminals of a cell in an open circuit is 2.2 V. When a resistor of 5Ω is connected across the terminals of the cell, the potential difference between the terminals of the cell is found to be 1.8 V. The internal resistance of the cell is [2002]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 48

Open circuit emf of the cell is E = 2.2 V

When measured across the 5Ω resistor the Voltage becomes V = 1.8 Ω

31 Years NEET Previous Year Questions: Current Electricity - Question 49

An electric kettle has two heating coils. Whenone of the coils is connected to an a.c. source,the water in the kettle boils in 10 minutes. Whenthe other coil is used, the water boils in 40minutes. If both the coils are connected inparallel, the time taken by the same quantity ofwater to boil will be    [2003]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 49

 

31 Years NEET Previous Year Questions: Current Electricity - Question 50

Two 220 volt, 100 watt bulbs are connected firstin series and then in parallel. Each time thecombination is connected to a 220 volt a.c.supply line. The power drawn by thecombination in each case respectively will be   [2003]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 50

In series combination, resistance doubles.

Hence, power will be halved.
In parallel combination, resistance halves.
Hence, power will be doubled.

31 Years NEET Previous Year Questions: Current Electricity - Question 51

Fuse wire is a wire of    [2003]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 51

Fuse wire : It is used in a circuit to control the
maximum current flowing in circuit. It is a thin
wire having high resistance and is made up
of a material with low melting point.

31 Years NEET Previous Year Questions: Current Electricity - Question 52

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 the combination as seen by the battery is    [2003]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 52

Since, Wheatstone's bridge is balanced, then
resistance of galvanometer will be
uneffective.

31 Years NEET Previous Year Questions: Current Electricity - Question 53

A battery is charged at a potential of 15V for 8hours when the current flowing is 10A. Thebattery on discharge supplies a current of 5Afor 15 hours. The mean terminal voltage duringdischarge is 14V. The “watt-hour” efficiency ofthe battery is [2004]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 53

Efficiency is given by η = output/input

31 Years NEET Previous Year Questions: Current Electricity - Question 54

When three identical bulbs of 60 watt, 200 voltrating are connected in series to a 200 voltsupply, the power drawn by them will be        [2004]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 54

31 Years NEET Previous Year Questions: Current Electricity - Question 55

In India electricity is supplied for domestic useat 220 V. It is supplied at 110 V in USA. If theresistance of a 60 W bulb for use in India is R,the resistance of a 60 W bulb for use in USA will  be    [2004]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 55

31 Years NEET Previous Year Questions: Current Electricity - Question 56

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

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 56

∴ Resistance is halved, but specific
resistance remains the same.

31 Years NEET Previous Year Questions: Current Electricity - Question 57

Resistances n, each of r ohm, when connectedin parallel give an equivalent resistance of Rohm. If these resistances were connected inseries, the combination would have a resistancein ohms, equal to [2004]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 57

When connected in series, Req = nr
= n (nR) = n2R

31 Years NEET Previous Year Questions: Current Electricity - Question 58

Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be [2004]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 58

A balanced Wheststone’s bridge exists
between A & B.

∴ Req = R
Current through circuit = V/R
Current through AFCEB = V/2R

31 Years NEET Previous Year Questions: Current Electricity - Question 59

A 6 volt battery is connected to the terminals ofthe three metre long wire of uniform thicknessand resistance of 100 ohm. The difference ofpotential between two points on the wireseparated by a distance of 50 cm will be  [2004]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 59

R α
For 300 cm, R = 100 Ω

31 Years NEET Previous Year Questions: Current Electricity - Question 60

A 5–ampere fuse wire can withstand amaximum power of 1 watt in the circuit. Theresistance of the fuse wire is [2005]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 60

31 Years NEET Previous Year Questions: Current Electricity - Question 61

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 opposite points will be [2005]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 61

31 Years NEET Previous Year Questions: Current Electricity - Question 62

For the network shown in the Fig. the value of the current i is [2005]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 62

It is a balanced Wheatstone bridge. Hence
resistance 4Ω can be eliminated.

31 Years NEET Previous Year Questions: Current Electricity - Question 63

Two batteries, one of emf 18 volt and internal resistance 2Ω and the other of emf 12 volt andinternal resistance 1Ω, are connected asshown. The voltmeter V will record a readingof [2005]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 63

(Since the cells are in parallel).

31 Years NEET Previous Year Questions: Current Electricity - Question 64

In producing chlorine through electrolysis, 100watt power at 125 V is being consumed. Howmuch chlorine per minute is liberated? E.C.E. ofchlorine is 0.367 × 10–6 kg/ coulomb. [2006]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 64

Power = V × I

E.C.E. of chlorine is 0.367 × 10–6 kg/coulomb
Charge passing in one minute = 

= 48 coulomb

Chlorine precipitated = 0.367 × 10–6 × 48
= 17.6 × 10–6 kg
= 17.6 mg

31 Years NEET Previous Year Questions: Current Electricity - Question 65

Power dissipated across the 8Ω resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the 3Ω resistor is

[2006]

Detailed Solution for 31 Years NEET Previous Year Questions: Current Electricity - Question 65

Power = V . I = I2R

This is the potential over parallel branch. So,

i1 = 4/4 =1A

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