Temperature — Set 4
Physics · तापमान · Questions 31–40 of 50
Between the freezing and boiling points of water, which scale has 180 equal divisions?
Correct Answer: A. Fahrenheit scale
On the Fahrenheit scale, water freezes at 32°F and boils at 212°F under standard pressure. The difference is 212 - 32 = 180 divisions. This is why Fahrenheit has 180 equal steps between those points.
Which statement about writing temperature in kelvin is correct?
Correct Answer: B. Kelvin is written as K without a degree sign
Kelvin is written with the symbol K and no degree sign. This is because kelvin is an SI base unit. Celsius and Fahrenheit commonly use the degree sign.
A temperature of 373 K is approximately equal to which Celsius temperature?
Correct Answer: D. 100°C
Convert kelvin to Celsius by subtracting 273.15. So 373 - 273.15 equals 99.85°C, about 100°C. This corresponds to the boiling point of water at standard pressure.
In gas laws like Charles’ law, temperature should be measured on which scale?
Correct Answer: A. Kelvin scale
Gas laws require absolute temperature for correct proportionality. The kelvin scale is an absolute scale starting at absolute zero. Using Celsius can give wrong ratios because it is not absolute.
Under standard pressure, what is the Fahrenheit boiling point of water?
Correct Answer: D. 212°F
On the Fahrenheit scale, the boiling point of water at standard pressure is 212°F. The freezing point is 32°F on the same scale. The interval between them is 180°F degrees.
What special feature helps a clinical mercury thermometer hold the reading after it is removed from the body?
Correct Answer: D. A narrow constriction in the capillary
A clinical mercury thermometer has a small constriction in the capillary tube. This prevents mercury from flowing back quickly, so the reading can be noted. The thermometer is then shaken to reset the mercury level.
Convert 68°F to degrees Celsius.?
Correct Answer: B. 20°C
Use C = (F - 32) × 5/9 to convert Fahrenheit to Celsius. For 68°F, (68 - 32) × 5/9 equals 36 × 5/9 = 20°C. This value is a common comfortable room temperature.
What is the value of absolute zero on the kelvin scale?
Correct Answer: C. 0 K
Absolute zero is defined as 0 on the kelvin scale. Kelvin is an absolute scale, so it starts at this lower limit. This makes kelvin useful for thermodynamics and gas laws.
Convert 27°C to kelvin (approximately).?
Correct Answer: D. 300 K
Convert Celsius to kelvin by adding 273.15. So 27 + 273.15 equals 300.15 K, about 300 K. Temperatures near 27°C are often close to 300 K.
Which relation correctly connects Celsius temperature C and Fahrenheit temperature F?
Correct Answer: C. C/5 = (F - 32)/9
The standard conversion relation is C/5 = (F - 32)/9. It comes from the equal interval ratio between the two scales. This formula helps convert temperatures in either direction.