एका विशिष्ट अंशाचे तापमान नियंत्रित करण्यासाठी वापरले जाणारे साधन म्हणजे काय? A. थर्मोस्टॅट B. थर्मामीटर C. पायरोमीटर D. थर्मोकपल

A thermostat automatically switches heating or cooling on and off to keep the temperature at a set value, as in irons, refrigerators and air conditioners. A thermometer only measures temperature, a pyrometer measures very high temperatures, and a thermocouple is a temperature sensor.