JEE Questions for Physics Current Electricity I Quiz 13

A potentiometer consists of a wire of length 4 m and resistance 10 Ω. It is connected to cell of e.m.f 2 V. The potential difference per unit length of the wire will be

0%
0.5 V/m
0%
10 V/m
0%
2 V/m
0%
5 V/m

A galvanometer of resistance 36 Ω is changed into an ammeter by using a shunt of 4 Ω. The fraction f₀ of total current passing through the galvanometer is

0%
0%
2)
0%
0%

A resistance of 2 Ω is connected across one gap of a meter-bridge (the length of the wire is 100 cm) and an unknown resistance, greater than 2 Ω is connected across the other gap. When these resistances are interchanged, the balance point shifts by 20 cm. neglecting any corrections, the unknown resistance is

0%
3Ω
0%
4Ω
0%
5Ω
0%
6Ω

A 50 ohm galvanometer gets full scale deflection when a current of 0.01 A passes through the coil. When it is converted to a 10 A ammeter, the shunt resistance is

0%
0.01 Ω
0%
0.05 Ω
0%
2000 Ω
0%
5000 Ω

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

0%
33.3 cm
0%
66.67cm
0%
25 cm
0%
50 cm

A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10^–7m² ohm-meter and the current passing through it is 0.1 ampere: cross-section of the wire is 10^–6 m². The potential gradient along the potentiometer wire is

0%
10–4 V/m
0%
10–6 V/m
0%
10–2 V/m
0%
10–8 V/m

Two resistances of 400 Ω and 800 Ω are connected in series with 6 volt battery of negligible internal resistance. A voltmeter of resistance 10,000 Ω is used to measure the potential difference across 400 Ω. The error in the measurement of potential difference in volt approximately is

0%
0.01
0%
0.02
0%
0.03
0%
0.05

An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A the value of the required shunt is

0%
0.09 Ω
0%
0.03 Ω
0%
0.3 Ω
0%
0.9 Ω

The length of a wire of a potentiometer is 100 cm, and the e.m.f of its standard cell is E volt. It is employed to measure the e.m.f of a battery whose internal resistance is 0.5 Ω. If the balance point is obtained at l= 30 cm from the positive end, the e.m.f. of the battery is

0%
0%
2)
0%
0%

In given figure, the potentiometer wire AB has a resistance of 5 Ω and length 10 m. The balancing length AM for the e.m.f of 0.4 V is
Physics-Current Electricity I-65385.png

0%
0.4 m
0%
4 m
0%
0.8 m
0%
8 m

What is the reading of voltmeter in the following figure?
Physics-Current Electricity I-65387.png

0%
3 V
0%
2 V
0%
5 V
0%
4 V

The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is ... (in ohm)

0%
5040
0%
4960
0%
2010
0%
4050

For the post office box arrangement to determine the value of unknown resistance the unknown resistance should be connected between
Physics-Current Electricity I-65390.png

0%
B and C
0%
C and D
0%
A and D
0%
B and C

In a metre bridge experiment null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X < Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y

0%
50 cm
0%
80 cm
0%
40 cm
0%
70 cm

The potentiometer is superior to a voltmeter for measuring a potential difference because

0%
The resistance of the voltmeter
0%
The potentiometer does not draw any current from the source of the potential
0%
The sensitivity of potentiometer is better than that of the voltmeter
0%
The voltmeter has a dial and of small size

The range of a voltmeter of resistance 500 Ω is 10V. The resistance to be connected to convert it into an ammeter of range 10 A is

0%
1 Ω in parallel
0%
1 Ω in series
0%
0.1 Ω in parallel
0%
0.1 Ω in series

Three voltmeters A, B and C having resistances R, 1.5R and 3R respectively are used in a circuit as shown. When a P.D. is applied between X and Y, the reading of the voltmeters are V₁, V₂ and V₃ respectively. Then
Physics-Current Electricity I-65393.png

0%
V1 = V2 = V3
0%
V1< V2 = V3
0%
V1> V2> V3
0%
V1> V2 = V3

When the number of turns of the coil is doubled, the current sensitivity of a moving coil galvanometer is doubled whereas the voltage sensitivity of the galvanometer

0%
Remains the same
0%
Is halved
0%
Is doubled
0%
Is quadrupled

A galvanometer of resistance 100 Ω is converted to a voltmeter of range 10 V by connecting a resistance of 10 k Ω The resistance required to convert the same galvanometer to an ammeter of range 1 A is

0%
0.4 Ω
0%
0.3 Ω
0%
1.2 Ω
0%
0.1 Ω

A meter bridge is set-up as shown, to determine an unknown resistance ‘X’ using a standard 10 ohm resistor. The galvanometer shows null point when tapping-key is at 52 cm mark. The end-corrections are 1 cm and 2 cm respectively for the ends A and B. The determined value of ‘X’is
Physics-Current Electricity I-65396.png

0%
10.2 ohm
0%
10.6 ohm
0%
10.8 ohm
0%
11.1 ohm

In a potentiometer experiment, when three cells A, B and C are connected in series, the balancing length is found to be 740 cm. If A and B are connected in series balancing length is 440 cm and for B and C connected in series that is 540 cm. Then the e.m.f of E_A, E_B and E_Care respectively (in volts)

0%
1, 1.2 and 1.5
0%
1, 2, and 3
0%
1.5, 2 and 3
0%
1.5, 2.5 and 3.5

A galvanometer of resistance G can measure lA current. If a shunt S is used to convert it into an ammeter to measure A current. The ratio of G/S is

0%
0%
2)
0%
10
0%

Two uniform wires A and B are of the same metal and have equal masses. The radius of wire A is twice that of wire B. The total resistance of A and B when connected in parallel is

0%
4 Ω when the resistance of wire A is 4.25 Ω
0%
5 Ω when the resistance of wire A is 4.25 Ω
0%
4Ω when the resistance of wire B is 4.25 Ω
0%
5 Ω when the resistance of wire B is 4.25 Ω

Twelve wires of equal length and same cross-section are connected in the form of a cube. If the resistance of each of the wires is R, then the effective resistance between the two diagonal ends would be
Physics-Current Electricity I-65404.png

0%
2 R
0%
12 R
0%
0%
8 R

You are given several identical resistances each of value R = 10 Ω and each capable of carrying maximum current of 1 ampere. It is required to make a suitable combination of these resistances to produce a resistance of 5Ω which can carry a current of 4 ampere. The minimum number of resistances of the type R that will be required for this job

0%
4
0%
10
0%
8
0%
20

Figure shows three resistor configurations R₁, R₂ and R₃ connected to 3V battery. If the power dissipated by the configuration R₁, R₂ and R₃ is P₁, P₂ and P₃respectively then
Physics-Current Electricity I-65408.png

0%
P1> P2> P3
0%
P1> P3> P2
0%
P2> P1>P3
0%
P3> P2> P1

A torch bulb rated as 4.5 W, 1.5 V is connected as shown in the figure. The e.m.f. of the cell needed to make the bulb glow at full intensity is
Physics-Current Electricity I-65410.png

0%
4.5 V
0%
1.5 V
0%
2.67 V
0%
13.5 V

In the circuit shown in the figure, the current through
Physics-Current Electricity I-65412.png

0%
The 3 Ω resistor is 0.50 A
0%
The 3Ω resistor is 0.25 A
0%
The 4Ω resistor is 0.50 A
0%
The 4 Ω resistor is 0.25 A

There are three resistance coils of equal resistance. The maximum number of resistances you can obtain by connecting them in any manner you choose, being free to use any number of the coils in any way is

0%
3
0%
4
0%
6
0%
5

In the circuit shown, the value of each resistance is r, then equivalent resistance of circuit between points A and B will be
Physics-Current Electricity I-65415.png

0%
(4/r
0%
3r/2
0%
r/3
0%
8r/7

If in the circuit shown below, the internal resistance of the battery is 1.5 Ω and V_P and V_Q are the potentials at P and Q respectively, what is the potential difference between the points P and Q ?
Physics-Current Electricity I-65417.png

0%
Zero
0%
4 volts (VP>VQ)
0%
4 volts (VQ>VP)
0%
2.5 volts (VQ>VP)

Two wires of resistances R₁ and R₂ have temperature coefficient of resistances α₁ and α₂ respectively. These are joined in series. The effective temperature coefficient of resistance is

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0%
2)
0%
0%

When connected across the terminals of a cell, a voltmeter measures 5 V and a connected ammeter measures 10 A of current. A resistance of 2 ohm is connected across the terminals of the cell. The current flowing through this resistance will be

0%
2.5 A
0%
2.0 A
0%
5.0 A
0%
7.5 A

In the circuit shown here, E₁ = E₂ = E₃ = 2V and R₁ = R₂ = 4 ohm. The current flowing between points A and B through battery E₂ is
Physics-Current Electricity I-65425.png

0%
Zero
0%
2 amp from A to B
0%
2 amp from B to A
0%
None of these

Two resistors of resistances 200 kΩ and 1 MΩ respectively form a potential divider with outer junctions maintained at potentials of +3V and –15 V. Then, the potential at the junction between the resistors is

0%
+1V
0%
–0.6 V
0%
0 V
0%
–12 V
0%
+12 V

The potential difference across 8 ohm resistance is 48 volt as shown in the figure. The value of potential difference across X and Y points will be
Physics-Current Electricity I-65428.png

0%
160 volt
0%
128 volt
0%
80 volt
0%
62 volt

Two resistances R₁ and R₂ are made of different materials. The temperature coefficient of the material of R₁ is ∝ and of the material of R₂ is B. The resistance of the series combination of R₁ and R₂ will not change with temperature, if R₂ equals

0%
0%
2)
0%
0%

An ionization chamber with parallel conducting plates as anode and cathode has 5 × 10⁷ electrons and the same number of singly-charged positive ions per cm³. The electrons are moving at 0.4 m/s. The current density from anode to cathode is 4 μA/m². The velocity of positive ions moving towards cathode is

0%
0.4 m/s
0%
16 m/s
0%
Zero
0%
0.1 m/s

A wire of resistance 10 Ω. is bent to form a circle. P and Q are points on the circumference of the circle dividing it into a quadrant and are connected to a battery of 3 V and internal resistance 1 Ω as shown in the figure. The currents in the two parts of the circle are
Physics-Current Electricity I-65436.png

0%
0%
2)
0%
0%

In the given circuit, it is observed that the current I is independent of the value of the resistance R₆. Then the resistance values must satisfy
Physics-Current Electricity I-65442.png

0%
0%
2)
0%
0%

In the given circuit, with steady current, the potential drop across the capacitor must be
Physics-Current Electricity I-65448.png

0%
V
0%
V / 2
0%
V / 3
0%
2V / 3

A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to current, the temperature of the wire is raised by ∆T in time t. A number N of similar cells is now connected in series with a wire of the same material and cross-section but of length 2L. The temperature of the wire is raised by the same amount ∆T in the same time t. The value of N is

0%
4
0%
6
0%
8
0%
9

What is the equivalent resistance between the points A and B of the network?
Physics-Current Electricity I-65451.png

0%
0%
2)
0%
0%

4 cells each of e.m.f 2 V and internal resistance of 1 Ω are connected in parallel to a load resistor of 2 Ω. Then thecurrent through the load resistor is

0%
2 A
0%
1.5 A
0%
1 A
0%
0.888 A

The effective resistance between points P and Q of the electrical circuit shown in the figure is
Physics-Current Electricity I-65457.png

0%
2Rr/ (R + r)
0%
8R (R + r) / (3R + r)
0%
2r + 4R
0%
5R/2 + 2r

The current in a conductor varies with time t as I = 2t + 3t² where I is in ampere and t in seconds. Electric charge flowing through a section of the conductor during t = 2 sec to t = 3 sec is

0%
10 C
0%
24 C
0%
33 C
0%
44 C

A group of N cells whose e.m.f varies directly with the internal resistance as per the equation E_N = 1.5 r_N are connected as shown in the figure below. The current I in the circuit is
Physics-Current Electricity I-65460.png

0%
0.51 amp
0%
5.1 amp
0%
0.15 amp
0%
1.5 amp

The resistance of a wire of iron is 10 ohm and temp, coefficient of resistance is 5 × 10^–3/° C. At 20°C it carries 30 milliampere of current. Keeping constant potential difference between its ends, the temperature of the wire is raised to 120°C . The current in milliampere that flows in the wire is

0%
20
0%
15
0%
10
0%
40

Seven resistances are connected as shown in the figure. The equivalent resistance between A and B is
Physics-Current Electricity I-65463.png

0%
3 Ω
0%
4 Ω
0%
4.5 Ω
0%
5 Ω

A battery of internal resistance 4 Ω is connected to the network of resistances as shown. In order to give the maximum power to the network, the value of R (in Ω) should be
Physics-Current Electricity I-65465.png

0%
4/9
0%
8/9
0%
2
0%
18

JEE Questions for Physics Current Electricity I Quiz 13 - MCQExams.com

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JEE Questions for Physics Current Electricity I Quiz 13 - MCQExams.com

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