Galvanometer ammeter and voltmeter | Learn Physics

10 Question-answer on Galvanometer ammeter and voltmeter

1.       Which has greater resistance

(a)    Voltmeter has more resistance

(b)   Mill voltmeter has more resistance

(c)    Both have same resistance

(d)   Depends on size of meter coil.

Ans: (a)

2.       Which has grater resistance?

(a)    Ammeter has more resistance

(b)   Milliammeter has more resistance

(c)    Both have equal resistance

(d)   Depends on size of meter

Ans: ( b)

3.       An ammeter has a resistance of G ohm and a range of I ampere. The value of resistance used in parallel to convert it into an ammeter of range ni ampere is:

(a)    n G

(b)   (n-1) G

(c)    G/n

(d)   G /(n-1)

Ans: ( b)

4.       The deflection in galvanometer falls from 50 division to 20 when a 12 ohm shunt is applied. The galvanometer resistance is:

(a)    18 ohms

(b)   36 ohms

(c)    24 ohms

(d)   30 ohms.

Ans: ( a)

5.       The sensitivity of a galvanometer does not depend upon

(a)    A very strong magnetic field in the permanent magnet

(b)   The current it measures

(c)    A very thin, weak suspension

(d)   A large number of turns in the coil.

Ans: (b)

6.       A boy wired a battery in series with resistance and an ammeter. He wired up a voltmeter in parallel with the resistance. Which of the following could the boy not find with the apparatus?

(a)    The current flowing through the voltmeter.

(b)   The current flowing through the battery.

(c)    The potential difference across the resistance

(d)   The value of the resistance

Ans: ( a)

7.       The sensitivity of a moving coil galvanometer depends on:

(a)    The angle of deflection

(b)   Earth’s magnetic field

(c)    Torsional constant of the spring

(d)   The moment of inertia of the coil.

Ans: (c)

8.       Of the following an ideal voltmeter is:

(a)    Moving coil voltmeter]

(b)   Voltmeter

(c)    An electrometer

(d)   Hot wire voltmeter.

Ans: ( c)

9.       The deflection in moving coil galvanometer is produced to half, when it is shunted with a 40Ω coil. The resistance of the galvanometer is:

(a)    60 Ω

(b)   10 Ω

(c)    40 Ω

(d)   20 Ω

Ans: ( c )

10.   In a moving coil galvanometer, we use a radial magnetic field so that the galvanometer scale is:

(a)    Exponential

(b)   Linear

(c)    Algebraic

(d)   Logarithmic.

Ans: ( b)