Select the option that can be used as a one-word substitute for the highlighted group of words in the given sentence.
That scientist worked relentlessly to improve the instrument for measuring electric current.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Ammeter.
Correct word: Ammeter
Meaning: An instrument used for measuring electric current in a circuit.
Example: The technician connected an ammeter to the circuit to check the flow of current.
Meaning of the other words:
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Thermometer = an instrument used to measure temperature.
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Calculator = a device used to perform mathematical calculations.
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Compass = an instrument used for navigation and finding directions.
Hence, the chosen option will be correct.