- 1(current)
Q. No.To measure the potential difference across an element in a circuit:
| 1. | voltmeter is connected in parallel to the element. |
| 2. | voltmeter is connected in series to the element. |
| 3. | ammeter is connected in parallel to the element. |
| 4. | ammeter is connected in series to the element. |
Subtopic: Moving Coil Galvanometer |
85%
Level 1: 80%+
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The device used to measure small electric current in a circuit:
1. meter bridge
2. voltmeter
3. galvanometer
4. resistance
1. meter bridge
2. voltmeter
3. galvanometer
4. resistance
Subtopic: Moving Coil Galvanometer |
83%
Level 1: 80%+
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A galvanometer with a coil resistance of \(25~\Omega\) requires a current of \(1~\text{mA}\) for full-scale deflection. To construct an ammeter that can measure up to \(2~\text A,\) what should be the approximate value of the shunt resistance?
1. \(1.25 × 10^{–2}~\Omega\)
2. \(2.5 × 10^{–3}~\Omega\)
3. \(2.5 × 10^{–2}~\Omega\)
4. \(1.25 × 10^{–3}~\Omega\)
1. \(1.25 × 10^{–2}~\Omega\)
2. \(2.5 × 10^{–3}~\Omega\)
3. \(2.5 × 10^{–2}~\Omega\)
4. \(1.25 × 10^{–3}~\Omega\)
Subtopic: Moving Coil Galvanometer |
75%
Level 2: 60%+
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If the current \(200~\mu\text{A}\) deflects the coil of the moving coil galvanometer through \(60^\circ,\) then the current required to cause deflection through \(\pi\over 10\) radians is:
1. \(60~\mu\text{A}\)
2. \(50~\mu\text{A}\)
3. \(20~\mu\text{A}\)
4. \(150~\mu\text{A}\)
1. \(60~\mu\text{A}\)
2. \(50~\mu\text{A}\)
3. \(20~\mu\text{A}\)
4. \(150~\mu\text{A}\)
Subtopic: Moving Coil Galvanometer |
81%
Level 1: 80%+
JEE
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Given below are two statements:
| Assertion (A): | When a soft iron is inserted into the coil of a moving coil galvanometer, both the current sensitivity and voltage sensitivity of the galvanometer increase. |
| Reason (R): | Current sensitivity and voltage sensitivity are directly proportional to the magnetic induction in the coil. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Moving Coil Galvanometer |
83%
Level 1: 80%+
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A galvanometer of resistance \(G\) is converted into a voltmeter of range \(0\text-1\) V by connecting a resistance \(R_1\) in series with it. The additional resistance that should be connected in series with \(R_1\) to increase the range of the voltmeter to \(0\text-2\) V will be:
1. \(R_1\)
2. \(R_1+G\)
3. \(R_1-G\)
4. \(G\)
Subtopic: Moving Coil Galvanometer |
81%
Level 1: 80%+
JEE
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A galvanometer having a coil resistance of \(60~ \Omega\) shows full-scale deflection when a current of \(1.0\) A passes through it. It can be converted into an ammeter to read currents up to \(5.0\) A by:
| 1. | Putting in parallel, a resistance of \(24~ \Omega\) |
| 2. | Putting in series, a resistance of \(15~ \Omega\) |
| 3. | Putting in series, a resistance of \(240~ \Omega\) |
| 4. | Putting in parallel, a resistance of \(15~ \Omega\) |
Subtopic: Moving Coil Galvanometer | Conversion to Ammeter & Voltmeter |
80%
Level 1: 80%+
AIPMT - 2009
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The resistance of an ammeter is 13 Ω and its scale is graduated for a current up to 100 A. After an additional shunt has been connected to this ammeter, it becomes possible to measure currents up to 750 A by this ammeter. The value of shunt resistance is:
1. 20
2. 2
3. 0.2
4. 2 k
Subtopic: Moving Coil Galvanometer |
79%
Level 2: 60%+
AIPMT - 2007
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In an experiment to determine the resistance of a galvanometer by half deflection method, the following circuit is used. In one set of readings, if \(R = 500~ \Omega\) and \(S = 50~ \Omega\) then the resistance of Galvanometer is:
1. \(50.5~ \Omega\)
2. \(55.56~ \Omega\)
3. \(52.5~ \Omega\)
4. \(47.5~ \Omega\)
1. \(50.5~ \Omega\)
2. \(55.56~ \Omega\)
3. \(52.5~ \Omega\)
4. \(47.5~ \Omega\)
Subtopic: Moving Coil Galvanometer |
78%
Level 2: 60%+
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The deflection of a moving coil galvanometer falls from \(60\) divisions to \(12\) divisions for the same value of current in the circuit, when a shunt of \(12~\Omega\) is connected. The resistance of the galvanometer is:
| 1. | \(2~\Omega\) | 2. | \(20~\Omega\) |
| 3. | \(48~\Omega\) | 4. | \(96~\Omega\) |
Subtopic: Moving Coil Galvanometer |
77%
Level 2: 60%+
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Q. No.
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