Temperature — Set 2
Physics · तापमान · Questions 11–20 of 50
A typical clinical thermometer is designed to measure temperatures approximately in which range?
Correct Answer: B. 35°C to 42°C
Clinical thermometers are made for human body temperatures, so their range is narrow. A common range is about 35°C to 42°C. This narrow range improves sensitivity for small temperature changes in the body.
A thermocouple works primarily on which physical effect?
Correct Answer: B. Seebeck effect
A thermocouple produces an emf when two dissimilar metals have junctions at different temperatures. This is called the Seebeck effect. It allows temperature measurement over a wide range.
A platinum resistance thermometer measures temperature based on change in which property?
Correct Answer: C. Electrical resistance of platinum
In a resistance thermometer, the metal’s electrical resistance changes with temperature. Platinum is used because it is stable and gives nearly repeatable results. Such thermometers are often used for accurate laboratory measurements.
At what temperature do the Celsius and Fahrenheit scales show the same numerical value?
Correct Answer: B. -40°
Set the two readings equal using the relation F = (9/5)C + 32. Solving C = (9/5)C + 32 gives C = -40. Therefore -40°C equals -40°F.
What is the triple point of water on the kelvin scale?
Correct Answer: C. 273.16 K
The triple point is a unique state where solid, liquid, and vapor can coexist in equilibrium. For water it is defined as 273.16 K. It is an important fixed point used for precise temperature reference.
Which statement about temperature is correct?
Correct Answer: C. Temperature is an intensive property
Temperature is intensive, meaning it does not depend on how much material you have. A small cup and a large tank can be at the same temperature. In contrast, heat energy depends on the amount of substance.
The ice point 0°C corresponds to approximately what temperature on the kelvin scale?
Correct Answer: C. 273.15 K
Convert Celsius to kelvin by adding 273.15. For 0°C, the value becomes 273.15 K. This mapping links the Celsius and absolute kelvin scales.
A temperature of 300 K is approximately equal to how many degrees Celsius?
Correct Answer: A. 27°C
Convert kelvin to Celsius by subtracting 273.15. So 300 - 273.15 equals 26.85°C, about 27°C. Room temperature is often close to 300 K.
A pyrometer is mainly used to measure temperature of very hot objects by detecting which type of radiation?
Correct Answer: C. Thermal electromagnetic radiation
A pyrometer measures high temperature without contact by sensing thermal radiation. Hotter objects emit more intense radiation, especially in infrared and visible ranges. This method is useful for furnaces and molten metals.
A common thermistor used in temperature sensing typically shows what behavior as temperature increases?
Correct Answer: D. Resistance decreases significantly
Many thermistors are NTC types, meaning their resistance decreases as temperature rises. This strong change makes them sensitive sensors. They are widely used in electronic temperature control circuits.