Question

Mercury thermometers are increasingly being replaced by digital thermometers. Which of the following is a correct reason for this?

• A. Reading of mercury thermometer can have parallax error.
• B. Mercury being toxic is difficult to dispose-off.
• C. Digital thermometers do not require physical contact to function.
• D. Digital thermometers are easier to read than mercury thermometers.

Answer 1

Answer: (A), (B), (D)

The correct options are
A

Reading of mercury thermometer can have parallax error.

B

Mercury being toxic is difficult to dispose-off.

D

Digital thermometers are easier to read than mercury thermometers.

Mercury thermometers are now increasingly being replaced because, mercury is toxic in nature. It harms living organisms and the environment. Disposal of mercury is also very difficult. On the other hand, digital thermometers are easy to use. There is no parallax error while observing the reading of a digital thermometer. Digital thermometers do require physical contact just like a mercury thermometer.