Question

The lower fixed point on the Celsius scale is:
A. Melting point of ice
B. Boiling point of water
C. Melting point of mercury
D. Mean of melting point and boiling point of water

Answer 1

Hint: – The lower fixed point in the Celsius scale is zero (0⁰C). Try to relate this information with the options.

Step By Step Answer:
The lower fixed point in the Celsius scale is zero (0⁰C) which is the melting point of ice.

Hence, the correct answer is A.

Additional information:
There are three temperature scales in use today, Fahrenheit, Celsius and Kelvin. Fahrenheit temperature scale is a scale based on 32 for the freezing point of water and 212 for the boiling point of water, the interval between the two being divided into 180 parts. If it's Celsius, 100 degrees Celsius is the temperature of boiling water (at sea level). Just fully boil it. If it's Fahrenheit, 100 degrees Fahrenheit is very close to body temperature (if you're not ill). You can use a normal medical thermometer. If you leave your elbow in the water for 5–10 seconds, you'll be able to form a rough idea of the water's temperature. If the water feels slightly warm, but not hot, it's around 100 degree Fahrenheit (38 degree Celsius).

Note – You should remember that water freezes and ice melts at zero degree Celsius on Celsius scale and 273 Kelvin on Kelvin scale. It means 0 degree Celsius is equal to 273 Kelvin. Knowing this will solve your problem and will also help you further.