Question 1 : If we want to change a galvanometer into an ammeter extra resistance required is<br/>

Question 2 : Why is the Wheatstone bridge better than the other methods of measuring resistances?

Question 3 : In the metre bridge experiment of resistances, the known and unknown resistances are inter-changed. The error so removed is:<br/>

Question 4 : The radial magnetic field is used in a suspended coil galvanometer to provide<br>

Question 5 : A current of $10^{-5}$ A produces a deflection of $10^{0}$ in a moving coil galvanometer. A current of $10^{-6}$ amp in the same galvanometer produces a deflection of<br><br><br>

Question 6 : A galvanometer with a shunt in parallel is used in series in a circuit. Then it is called<br/>

Question 7 : <strong>Which of the following is likely to have the largest resistance?</strong><br>

Question 9 : In a moving coil galvanometer a radial magnetic field is applied with concave magnetic poles, to have<br/>A) uniform magnetic field<br/>B) the plane of the coil parallel to field <br/>Choose the correct option among the following

Question 10 : Assertion: The coil is bound over the metallic frame in moving coil galvanometer. Reason: The metallic frame helps in making steady deflection without any oscillation.

Question 11 : A device used for measuring small currents due to changing magnetic field is known as:

Question 12 : In a moving coil galvanometer, deflection of the coil is related to the electrical current $i$ by the relation <br>

Question 13 : <span>State whether given statement is True or False<br/>The sum of all the voltage drops around a single closed loop in a circuit is zero.</span>

Question 14 : Best method to increase the sensitivity of the moving coil galvanometer is to decrease<br/>

Question 15 : Wheatstones&#8217;s bridge cannot be used for measurement of very _______ resistances.<br/><br/>

Question 17 : To increase the range of an ammeter, we need to connect a suitable<br/>

Question 19 : A lamp of 6 V and 30 W is used in a laboratory but the supply is of 120 V. what will be done to make use of the lamp?<br>(1) A resistance may be used<br>(2) A resistance may be used in series with lamp.<br>(3) The resistance should be of 18 $\Omega$.

Question 20 : Kirchhoff's law of meshes is in accordance with law of conservation of: <br/>

Question 21 : In a moving coil galvanometer, the deflection of the coil $\theta$ is related to the electric current $i$ by the relation<br>

Question 22 : In a moving cell galvanometer, we use a radial magnetic field so that the galvanometer scale is<br>

Question 23 : Three resistances P, Q, R each of $2\Omega $ and an<br>unknown resistance S form the four arms of a<br>Wheatstone bridge circuit. When a resistance of<br>$6\Omega $ is connected in parallel to S the bridge gets<br>balanced. What is the value of S ?<br><br><br><br>

Question 24 : A metre bridge is balanced with known resistance in the right gap and a metal wire in the left gap. If the metal wire is heated the balance point<br/>

Question 25 : To measure the resistance of a device using Ohm&#8217;s law the mode of connection used is<br/>

Question 28 : <strong>A galvanometer in series with a high resistance is called </strong><br>

Question 29 : In a moving coil galvanometer, the magnetic pole pieces are made cylindrical and a soft iron core is placed at the centre of the coil,the purpose for doing so is:<br/>

Question 30 : In ballistic galvanometer, the frame on which the coil is wound is non-metallic to:

Question 31 : Between any two points in a circuit, the sum of all .............. is the same through any pathway.<br>

Question 33 : <strong>If $2\%$ of the main current is to be passed through a galvanometer of resistance $G$, then resistance of the shunt required is </strong><br/>

Question 34 : A current of $10^{-7}$ ampere produces 50 division deflection in a galvanometer. Then its figure of merit will be<br>

Question 35 : A wire of length $L$ is made in the form of a coil in a moving coil galvanometer. To have maximum sensitiveness the shape of the coil is <br/>

Question 36 : A moving coil type of galvanometer is based upon the principle that<br>

Question 37 : Consider the following two statements:<br>1) Kirchoff's junction law follows from the conservation of charge<br>2) Kirchoff's loop law follows from the conservation of energy. <br><span>Which of the following is correct?</span>

Question 38 : A galvanometer of resistance $50\Omega $ is connected to a battery of $3 V$ along with a resistance of $2950 \Omega $ in series shown, full-scale deflection of $30$ divisions. The additional series resistance required to reduce the deflection to $20$ divisions is

Question 39 : The coil of the moving coil galvanometer is wound over an aluminium frame<br/>

Question 40 : The restoring couple in the moving coil galvanometer is due to<br/>

Question 41 : Kirchoff's first law, i.e., $\sum i = 0$ at a junction, deals with the conservation of

Question 42 : The current that must flow through the coil of a galvanometer so as to produce a deflection of one division on its scale is called<br>

Question 44 : If $10$% of the main current is to be passed through the moving coil galvanometer of resistance $99\Omega$, then the required shunt resistance will be :<br>

Question 45 : Consider the following two statements:<br>(A) Kirchhoff's Junction Law follows from conservation of charge.<br>(B) Kirchhoff's Loop Law follows from conservative nature of electric field.<br>

Question 46 : Which of the following methods does not help to minimize the error due to contact resistance in Wheatstone's meter bridge experiment:

Question 47 : In a meter bridge, a standard resistor of R ohm is connected in the left gap and two wires A and B are connected one after the other in the right gap. The balancing length measured from the left is 50 cm for either of them. If the two wires are connected is series and put in the right gap, the balancing length measured from the left would be (in cm)<br/>

Question 48 : In a Wheatstones's bridge, three resistances P, Q and R are connected in the three arms and the fourth arm is informed by two resistances $\displaystyle { S }_{ 1 }$ and $\displaystyle { S }_{ 2 }$ connected in parallel. The condition for the bridge to be balanced will be

Question 50 : Kirchoffs law of junctions is also called the law of conservation of:<br/>

Question 52 : The needle of a deflection galvanometer shows a deflection of $60^{\circ}$ due to a short bar magnet at a certain distance in $\tan A$ position. If the distance is doubled, the deflection is

Question 53 : The shunt required to send $10$% of the main current through a moving coil galvanometer of resistance $99\Omega$ is

Question 54 : A certain current on passing through a galvanometer produces a deflection of $100$ divisions. When a shunt of one ohm is connected, the deflection reduces to $1$ division. The galvanometer resistance is

Question 56 : Assertion: The coil is bound over the metallic frame in moving coil galvanometer. Reason: The metallic frame help in making steady deflection without any oscillation.

Question 57 : <div>The ratio of maximum current (with shunt) to the full scale deflection current (without current) in a permanent magnet moving coil instrument is known as</div>

Question 58 : In Wheatstones network $P = 2\Omega, Q = 2\Omega, R = 2\Omega$ and $S = 3\Omega$. The resistance with which $S$ is to shunted in order that the bridge may be balanced is

Question 59 : Which of the following material is used in making the core of a moving coil galvanometer?

Question 60 : In a potentiometer experiment for measuring the emf of a cell, the null point is at $240\ cm$ when we have a $500\Omega$$ resistor in series with the cell and galvanometer. If the series resistance reduced to half, then the null point will be at:

Question 61 : Which of the following statements is/are incorrect for a meter bridge, which is used to compare two resistances?<br>

Question 62 : Phosphor-Bronze wire is used for suspension in a moving coil galvanometer because it has.

Question 63 : The pole is pieces of a horse-shoe magnet are made cylindrical so that the deflection of the coil is proportional to<br>

Question 64 : In Wheatstone's bridge, three resistors P, Q, R are connected in three arms in order and $4^{th}$ arm S is formed by two resistors $s_1$ and $s_2$ connected in parallel. The condition for bridge to be balanced is: $\displaystyle\frac{P}{Q}=$<br/>

Question 65 : In deriving a formula for the combined resistance of three different resistors in series, Kirchhoffs<br>laws are used.<br>Which physics principle is involved in this derivation?

Question 66 : In order to convert a moving coil galvanometer into ammeter, the following will have to be connected<br>

Question 67 : The measurement of an unknown resistance $R$ is to be carried out using Wheat stones bridge Two students perform an experiment in two ways. The first students takes $R_{2}=10 \Omega$ and $R_{1}=5 \Omega .$ The other student takes $R_{2}=1000 \Omega$ and $R_{1}=500 \Omega .$ In the standard arm, both take $\mathrm{R}_{3}=5 \Omega .$ Both find $R=\dfrac{R_{2}}{R_{1}} R_{3}=10 \Omega$ within errors.

Question 68 : Two identical galvanometers are taken, one is to be converted into an ammeter and other into a milliammeter. Shunt of milliammeter compared to ammeter is

Question 69 : A moving coil ammeter requires a potential difference of $0.4V$ across it for full scale deflection. It has fixed shunt resistance of 0.01 ohm with a coil circuit resistance of $R = 1 k \ \ ohm$. The value of shunt required to give full scale deflection when the total current is $10 A$ is equal to<br/>

Question 71 : Assertion: Kirchhoff's junction rule can be applied to a junction of several lines or a point in a line. Reason: When steady current is flowing, there is no accumulation of charges at any junction or at any point in a line.

Question 72 : The AC voltage across a resistance can be measured using a<br>

Question 73 : If in a Wheatstone bridge the battery and Galvanometer are interchanged, the condition for balance<br/>

Question 74 : Assertion: A galvanometer can be used as a voltmeter to measure the voltage across a given section of the circuit. Reason: For this it must be connected in parallel with that section of the circuit.

Question 75 : The area of the coil in a moving coil galvanometer is 80 $cm^{2}$ and it has 200 turns. The magnetic induction of the radial field is 0.2 T and the couple per unit twist of the suspension wire is $2\times 10^{-6}Nm$ per degree. If the deflection is 4, the current passing through it is<br>

Question 76 : A rectangular coil 3x3 cm consisting of 100 turns caries 0.1 A. If it produces a deflection $10^{0}$, in a field of induction 0.1T, the couple per unit twist is<br/><br/>

Question 78 : A galvanometer of resistance, G, is shunted by a resistance S ohm. To keep the main current in the circuit unchanged the resistance to be put in series with the galvanometer is

Question 79 : A cell of negligible resistance and emf $2$ volt is connected to a series combination of $2, 3$ and $5$ ohm. The potential difference in volts between the terminals of $3$-ohm resistance will be:

Question 80 : In a experiment of meter bridge, a null point is obtained at the centre of the bridge wire. When a resistance of $10 \ ohm$ is connected in one gap, the value of resistance in other gap is

Question 81 : In a balanced wheat stone bridge, current in the galvanometer is zero. It remains zero when<br>$[1]$. battery emf is increased<br>$[2]$. all resistances are increased by 10 ohms<br>$[3]$. all resistances are made five times<br>$[4]$. the battery and the galvanometer are interchanged

Question 82 : <span>Kirchhoff's voltage law states that the algebraic sum of the product of resistance and current in each part of any closed circuit is equal to the algebraic sum of the emf's in that closed circuit.</span>State which law is this.

Question 83 : A galvanometer has current range of $15 mA$ and voltage range $750 mV$. To convert this galvanometer into an ammeter of range $25 A$, the required shunt is

Question 85 : A parallel combination of two resistors, of 1 $\Omega$ each, is connected in series with a $1.5 \Omega$ resistor. The total combination is connected across a $10\ V$ battery. The current flowing in the circuit is

Question 86 : A Wheatstone bridge has the resistance $10\Omega, 10\Omega, 10\Omega$ and $30\Omega$ in its four arms. What resistance joined in parallel to $30\Omega$ resistance will bring it to the balanced condition?

Question 87 : What is shape of magnet in moving coil galvanometer to make the radial magnetic field?

Question 88 : Which pair is not correct for the instrument used in the laboratory and their uses from the following?<br/><table class="wysiwyg-table"><tbody><tr><td></td><td><b>Instrument</b></td><td><b>Uses</b></td></tr><tr><td>(A)</td><td>Voltmeter</td><td>To measure the electric potential difference </td></tr><tr><td>(B)</td><td>Ammeter</td><td>To measure the electric current</td></tr><tr><td>(C)</td><td>Galvanometer</td><td>To detect the presence of current</td></tr><tr><td>(D)</td><td>Resistor</td><td>To supply the electric energy to circuit</td></tr></tbody></table>

Question 89 : A galvanometer, with a scale divided into $100$ equal divisions, has a current sensitivity of $10\;{\text{div per mA}}$ and voltage sensitivity $2{\text{ div per mV}}.$ To read $5A$ full scale deflection

Question 91 : The Kirchhoffs first law $(\sum i=0)$ and second law $(\sum \sum iR=\sum E)$ where the symbols have their usual meanings, are respectively based on

Question 92 : A galvanometer of 50 gives full scale deflection with 2 mA current as to convert it into ammeter range of 10 A is connected with it then shunt resistance will be<br/>

Question 93 : If the wire in the experiment to determine the resistivity of a material using metre bridge is replaced by copper or hollow wire the balance point i.e. null point shifts

Question 94 : A tangent galvanometer has a coil with $50$ turns and radius equal to $4$ cm. A current of $0.1$ Amp is passing through it. The plane of the coil is set parallel to the earth's magnetic meridian. If the value of the earth's horizontal component of the magnetic field is $7\times 10^{-5}T$ and $\mu_0= 4\pi \times 10^{-7}Wb/A-m$. then the deflection in the galvanometer needle will be :

Question 96 : In a metre bridge experiment null point is obtained at $40$cm form one end of the wire when resistance X is balanced against another resistance Y. If X $&lt;$ Y, then the new position of the null point from the same end, if one decides to balance a resistance of $3$X against Y, will be close to.

Question 97 : Assertion: In a meter bridge experiment, a high resistance is always connected in series with a galvanometer. Reason: As resistance increases, current through the circuit increases.

Question 98 : Assertion: The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Reason: Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.

Question 100 : The radius of each coil of a Helmholtz galvanometer is $0.1 m$ and number of turns in each is $25$. When a current is passed in it then the deflection of magnetic needle observed as $45^o$. If the horizontal component of earth's magnetic field is $0.314\times 10^{-4}T$ then the value of current will be<br/>