Question

____________ is an instrument used to measure the atmospheric pressure.
A.Barometer
B.Calorimeter
C.Thermometer
D.Speedometer

Answer 1

Hint: To answer this question, first understand the definition of all the terms mentioned in the options. Once the definition is clear it will be easy to identify the answer. There are different instruments for different purposes and the working of each instrument depends on different elements.

Complete answer:
A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.
A calorimeter is an object used for calorimetry, or the process of measuring the heat of chemical reactions or physical changes as well as heat capacity.
A thermometer is a device used to measure the temperature or a temperature gradient.
A speedometer is used to measure the speed of a vehicle.

Therefore, the correct answer is Option (A).

Additional Information:
Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. In most circumstances, atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation. Pressure measures force per unit area, with SI units of Pascals.

Note:
There are different kinds of instruments used to measure different attributes in the environment. To answer this type of question, it is essential to understand the definition of all the instruments present, so that it becomes easy to understand what instruments are used to measure what type of pressure.