The Question is from neet-physics thermal-properties-of-matter , and it was created by the author Mr. ANIL KUMAR.G

Question

A pyrometer is calibrated to measure temperatures in the range of 500°C to 2500°C. Which of the following is NOT a valid reason for choosing a pyrometer over a thermocouple in this temperature range?

Mr. ANIL KUMAR.G · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Temperature Measurement Techniques
 **Related Topics**: Pyrometers, Thermocouples, High-Temperature Measurement
 **Prerequisites**: Understanding of pyrometer and thermocouple operating principles.
## SOLUTION PATHWAY
**Given Information**:
  Temperature range: 500°C to 2500°C
  Instruments: Pyrometer and Thermocouple
  Task: Identify an invalid reason for choosing a pyrometer over a thermocouple.
**Method & Steps**:
 1. Analyze each option to determine its validity as a reason for choosing a pyrometer.
  Reasoning: Evaluate the advantages and disadvantages of pyrometers and thermocouples at high temperatures.
  Formula/Rule: None explicitly needed.
 2. Identify the option that does not represent a true advantage of pyrometers in this temperature range.
  Working:  Consider the capabilities of each instrument in relation to the given temperature range.
  Key Point:  Focus on the differences in measurement principles and limitations.
 3. Select the option that is not a valid reason for preferring a pyrometer.
  Result: Option D is incorrect.
  Verification: Check if the other options are valid reasons for preferring a pyrometer.
 ## OPTION ANALYSIS
A ✓: The object being measured may be inaccessible for direct contact.  This is a valid reason. Pyrometers measure temperature non-contact, while thermocouples require contact.
B :x: The high temperatures could damage a thermocouple. This is a valid reason. Thermocouples have temperature limits; exceeding them causes damage. Pyrometers are less susceptible to damage at these temperatures.
C :x: Pyrometers offer faster response times. This is a valid reason. Pyrometers generally have faster response times than thermocouples.
D :x: Pyrometers are more accurate than thermocouples at these temperatures. This is NOT necessarily true.  While both can be accurate, the accuracy depends on the specific instrument and calibration.  At extremely high temperatures, the accuracy of both can be affected by various factors.  Thermocouples, with proper calibration and selection, can be very accurate in this range.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Assuming pyrometers are always more accurate than thermocouples: Accuracy depends on many factors, not just the type of instrument.
  2.Overlooking the limitations of both instruments: Both pyrometers and thermocouples have specific limitations in terms of accuracy, range, and response time.
 **Quick Tips**:
  1.Consider the measurement method (contact vs. non-contact) when comparing pyrometers and thermocouples.
  2.Remember that accuracy depends on calibration and proper instrument selection for the specific application.

Mr. ANIL KUMAR.G · Answer

The object being measured may be inaccessible for direct contact.

Mr. ANIL KUMAR.G · Answer

The high temperatures could damage a thermocouple.

Mr. ANIL KUMAR.G · Answer

Pyrometers offer faster response times.

Mr. ANIL KUMAR.G · Answer

The correct Option is "Pyrometers are more accurate than thermocouples at these temperatures."

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