Measuring Devices and Scales

21. The liquid/liquids used in simple barometer is/are [M.P.P.C.S. (PRE) 2016]

(a) Water
(b) Mercury
(c) Alcohol
(d) All of the above

Correct Answer: (b) Mercury

Solution:A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A sudden fall of mercury in a barometer indicates the thunderstorms. There are different type of barometer e.g water-based, vacuum pump, mercury etc. While other liquids could theoretically be used, the practical limitations due to their density and vapor pressure make mercury the most suitable choice for a simple barometer.

22. The density of milk can be obtained by the use of : [M.P.P.C.S. (PRE) 2006]

(a) Hydrometer
(b) Butyrometer
(c) Lactometer
(d) Thermometer

Correct Answer: (c) Lactometer

Solution:Lactometer is used to measurement of the density of the milk. Butyrometer is used to measure fat content in milk or milk products.

23. The density of milk is measured by ? [M.P.P.C.S. (PRE) 2015]

(a) Lactometer
(b) Thermometer
(c) Hydrometer
(d) Hygrometer

Correct Answer: (a) Lactometer

Solution:Lactometer is used to measurement of the density of the milk.

24. Relative humidity is measured by : [U.P.P.C.S. (PRE) 1996 ,U.P.P.C.S. (PRE)1995]

(a) Lactometer
(b) Hygrometer
(c) Hydrometer
(d) Potentiometer

Correct Answer: (b) Hygrometer

Solution:Hygrometer is a device used to determine the relative humidity of the atmosphere.

Hydrometer used to measure the relative density of liquids.

The potentiometer is used to measure the electric potential in a circuit.

Lactometer is used to measurement of the density of the milk.

25. Which instrument is used for measuring humidity in the air ? [Chhatisgarh P.C.S. (PRE) 2008, U.P.P.S.C. (R.I)2014]

(a) Spectrometer
(b) Hygrometer
(c) Eudiometer
(d) Hydrometer

Correct Answer: (b) Hygrometer

Solution:Hygrometer is a device used to determine the relative humidity of the atmosphere.

Spectrometer is an instrument used to measure the properties of light over a specific portion of the electromagnetic spectrum.

A eudiometer is a laboratory device that measure the change in volume of a gas mixture following a physical or chemical change.

26. Hygrometer is used to measure - [Uttarakhand Lower sub (pre) 2010]

(a) Humidity in atmosphere
(b) Atmospheric pressure
(c) High temperature
(d) Velocity of wind

Correct Answer: (a) Humidity in atmosphere

Solution:Hygrometer is a device used to determine the relative humidity of the atmosphere.

27. Which instrument is used to measure humidity? [64th B.P.C.S (PRE) 2018]

(a) Hydrometer
(b) Hygrometer
(c) Pyrometer
(d) Lactometer

Correct Answer: (b) Hygrometer

Solution:Hygrometer is a device used to determine the relative humidity of the atmosphere.

28. Which of the following device quantify the humidity in air ? [R.A.S./R.T.S. (PRE) 1996]

(a) Pyrometer
(b) Hygrometer
(c) Hypsometer
(d) Thermostat

Correct Answer: (d) Thermostat

Solution:Hygrometer is a device used to determine the relative humidity of the atmosphere.

Pyrometer is used for measuring high temperature and hypsometer is used to measure the height or altitude.

Thermostat is a device which is used to measure for regulating the temperature of a system so that the system temperature is maintained near a desired set point temperature.

29. Ringelmann scale is used to measure the density of the following ? [U.P.R.O/A.R.O (MAINS) 2021]

(a) noise
(b) polluted water
(c) fog
(d) Smoke

Correct Answer: (d) Smoke

Solution:The Ringelmann scale is a scale for measuring the apparent density or opacity of smoke. It was developed by a French engineering Maximilien Ringelmann who first specified the scale in 1888.The Ringelmann smoke chart fulfills an important need in smoke abatement work and in certain problems in the combustion of fuels.

30. Which of the following correctly matched? [U.P.R.O/A.R.O.(PRE) 2016]

List-1	List-2
Thermoresistor	electric thermometer
Capacitor	thermometer
Bipoler junction transistor	rectifier
Junction diode	amplifier

Correct Answer: (a)

Solution:Thermoresistor is a device which acts as an electronic thermometer. This device changes its resistance with changes in temperature. So option (a) is correctly matched.

Measuring Devices and Scales

21. The liquid/liquids used in simple barometer is/are [M.P.P.C.S. (PRE) 2016]

22. The density of milk can be obtained by the use of : [M.P.P.C.S. (PRE) 2006]

23. The density of milk is measured by ? [M.P.P.C.S. (PRE) 2015]

24. Relative humidity is measured by : [U.P.P.C.S. (PRE) 1996 ,U.P.P.C.S. (PRE)1995]

25. Which instrument is used for measuring humidity in the air ? [Chhatisgarh P.C.S. (PRE) 2008, U.P.P.S.C. (R.I)2014]

26. Hygrometer is used to measure - [Uttarakhand Lower sub (pre) 2010]

27. Which instrument is used to measure humidity? [64th B.P.C.S (PRE) 2018]

28. Which of the following device quantify the humidity in air ? [R.A.S./R.T.S. (PRE) 1996]

29. Ringelmann scale is used to measure the density of the following ? [U.P.R.O/A.R.O (MAINS) 2021]

30. Which of the following correctly matched? [U.P.R.O/A.R.O.(PRE) 2016]

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