Question

Consider the following statements.
$1$. A galvanometer is converted into an ammeter when we connect a low resistance in parallel.
$2$. A galvanometer is converted into a voltmeter when we connect a high resistance in series.
$3$. The conductivity of superconductor is infinite.
Which of the statement(s) given is/are correct?

• A. Only $1$
• B. Only $2$
• C. $2$ and $3$
• D. $1,2$ and $3$

Answer 1

The correct option is D $1,2$ and $3$

A galvanometer can be converted into a voltmeter by connecting it with a resistance in series so as to increase the overall resistance. A galvanometer can be converted into an ammeter by connecting it with a resistance in parallel which decreases the overall resistance.
Superconductor have infinite conductivity.
So all the statments are correct.