This question was previously asked in

Official Soldier GD Paper : [Punjab Regt Centre, Ramgarh Cantt] - 2020

Option 4 : 0° C

The correct answer is__ 0°C__.

__Key Points__

- Celsius scale
- The Celsius scale is nowadays set in such a way that Zero degrees C is the temperature at which ice melts.
- At the other end of the scale, 100 degrees Celsius is the boiling point of water.
- In this scale, a lower fixed point (ice point) is designated as 0° and the upper fixed point (steam point) is designated as 100°.
- The temperature measured on this scale was all in degrees Celsius (°C).
- Formula (32°F - 32) × 5/9 = 0°C.
- 32 degrees Fahrenheit is equal to 0 degrees Celsius. Hence, Option 4 is correct.

- Fahrenheit scale
- The change in temperature of 1°F corresponds to a change of less than 1°C on the Celsius scale.
- On the Fahrenheit scale, water freezes at 32 degrees and boils at 212 degrees. The boiling and freezing point are therefore 180 degrees apart.
- Normal body temperature is considered to be 98.6 °F (in real life it fluctuates around this value).
- Absolute zero is defined as -459.67°F.

- Kelvin scale
- We also know the Kelvin temperature scale as the thermodynamic scale.
- On the Kelvin scale, the boiling point of the water is considered to be 373.15 K and its freezing point is 273.15 K.
- Whereas it was assumed that at 0 K there is no relative motion of particles,
- The change in temperature of 1° K corresponds to a change of less than 1°C on the Celsius scale.

- Conversion Formulas
- Celsius
- °C = (°F - 32) × 5/9
- °C = K - 273.15

- Fahrenheit
- °F = (°C × 9/5) + 32
- °F = ((K - 273.15) x 9/5) + 32

- Kelvin
- K = °C + 273.15
- K = ((°F - 32) × 5/9) + 273.15

- Celsius