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Q: Voltmeter is used for measuring-
  • A. Air resistance
  • B. Voltage
  • C. Magnetic flux
  • D. Electric current
Correct Answer: Option B - A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in voltmeter for the voltage of the circuit; digital voltmeters give a numerical display of voltage by the use of an analog-to-digital converter.
B. A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in voltmeter for the voltage of the circuit; digital voltmeters give a numerical display of voltage by the use of an analog-to-digital converter.

Explanations:

A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in voltmeter for the voltage of the circuit; digital voltmeters give a numerical display of voltage by the use of an analog-to-digital converter.