Which of the two, an ammeter or a milliammeter, has a higher resistance and why?

Why should an ammeter have a low resistance?

Which of the main parts of an optical fibre has a higher value of refractiv index?

If the ammeter in the given circuit reads 2A, the resistance R is

Which of the two Ferrous or Ferric ion has larger magnetic moment and why ?

The current flowing through a conductor and the potential difference across it two ends are as per readings of the ammeter and voltmeter shown below. The resistance of the conductor would be

Which of the following aqueous solution has the higher freezing point?