Moving Coil Galvanometer ( its sensitivity, and conversion to ammeter and voltmeter) NEET Questions

Physics - Magnetic Effects of Current and Magnetism

Moving Coil Galvanometer ( its sensitivity, and conversion to ammeter and voltmeter) MCQ Questions


13.
If a galvanometer of resistance G has full-scale deflection current Ig, to convert it into an ammeter of range I, the shunt resistance is:
A.
r_s = G × I / Ig
B.
r_s = G × (I - Ig) / Ig
C.
r_s = G × Ig / (I - Ig)
D.
r_s = G × Ig / I
😑 View Answer Rough Work Error
ANSWER :
C. r_s = G × Ig / (I - Ig)
14.
If a galvanometer of resistance G has full-scale deflection current Ig, to convert it into a voltmeter of range V, the series resistance is:
A.
R = V × G / Ig
B.
R = Ig × G / V
C.
R = V × Ig - G
D.
R = V/Ig - G
😑 View Answer Rough Work Error
ANSWER :
D. R = V/Ig - G
15.
A galvanometer with resistance 50 Ω shows full-scale deflection at 10 mA. To make it an ammeter of range 1 A, shunt required is:
A.
0.505 Ω
B.
0.5 Ω
C.
0.495 Ω
D.
0.0505 Ω
😑 View Answer Rough Work Error
ANSWER :
A. 0.505 Ω
16.
A galvanometer with resistance 100 Ω and full-scale deflection at 1 mA is to be converted to a voltmeter of range 10 V. Series resistance needed:
A.
100 Ω
B.
10000 Ω
C.
9900 Ω
D.
990 Ω
😑 View Answer Rough Work Error
ANSWER :
C. 9900 Ω
17.
Current sensitivity of a galvanometer can be increased by:
A.
Decreasing A and B
B.
Increasing area A, field B, number of turns N, or decreasing spring constant k
C.
Increasing spring constant k
D.
Decreasing number of turns N
😑 View Answer Rough Work Error
ANSWER :
B. Increasing area A, field B, number of turns N, or decreasing spring constant k
18.
If the number of turns of the coil in a galvanometer is doubled, current sensitivity:
A.
Quadruples
B.
Doubles
C.
Halves
D.
Remains same
😑 View Answer Rough Work Error
ANSWER :
B. Doubles