Question

Choose the appropriate word at (?) which bears the same relationship with the given fourth word as with the first two words.

Scale : Length :: ? : Pressure

1. Pascal
2. Atmosphere
3. Barometer
4. Water

Answer 1

Correct Answer - Option 3 : Barometer

The logic follows here is:

Scale is an instrument used to measure the length.

Similarly,

Barometer is an instrument used to measure pressure.

Hence, the correct answer is "Barometer". 

The pascal (Pa) is the SI unit of pressure and stress in the metre-kilogram-second system (the International System of Units [SI].

Instrument	Used for
Altimeter	It measures altitudes and is used in aircraft.
Bolometer	It measures heat radiation.
Hydrophone	It measures sound underwater.
Hygrometer	It measures humidity in the air.
lactometer	It determines the purity of milk.
Pyrometer	It measures a very high temperature.
Viscometer	It measures the viscosity of liquids.