1. Which one of the following instruments is used for locating submerged objects in an ocean?
(a) Audiometer
(b) Galvanometer
(c) Sextant
(d) SONAR
[U.P. R.O./A.R.O. (Pre) (Re. Exam) 2016, U.P.P.C.S. (Pre) 2000]
Ans. (d) SONAR
- SONAR is a way of finding things that are underwater.
- It works by sending out sound waves, which hit the object and bounce back, telling us where it is.
- This is used to find submarines and icebergs.
|
2. SONAR is mostly used by–
(a) Astronauts
(b) Doctors
(c) Engineers
(d) Navigators
[Chhattisgarh P.C.S. (Pre) 2011]
Ans. (d) Navigators
- Navigators usually make use of SONAR.
|
3. In SONAR, we use –
(a) Radio waves
(b) Audible sound waves
(c) Ultrasonic waves
(d) Infrasonic waves
[U.P.P.C.S. (Mains) 2013]
Ans. (c) Ultrasonic waves
- SONAR is a tool that uses sound waves to measure how far away, what direction, and how fast something is underwater.
|
4. The apparatus used to measure the intensity of sound is :
(a) Chronometer
(b) Anemometer
(c) Audiophone
(d) Audiometer
[M.P.P.C.S. (Pre) 1990]
Ans. (d) Audiometer
- An Audiometer measures how loud sound is, an Anemometer measures wind speed and pressure, a Chronometer is a very accurate clock, and an Audiophone is a type of device that helps people hear better.
|
5. Which of the following is measured by an ‘Anemometer’?
(a) Velocity of water flow
(b) Depth of water
(c) Force of the wind
(d) Intensity of light
[M.P.P.C.S. (Pre) 2012]
Ans. (c) Force of the wind
- An anemometer is a tool used to figure out how fast the wind is blowing.
- It is often found in weather stations.
|
6. The velocity of wind is measured by :
(a) Barometer
(b) Anemometer
(c) Hydrometer
(d) Wind vane
[U.P.P.C.S. (Pre) 2016]
Ans. (b) Anemometer
- An anemometer is a tool used to measure how fast the wind is blowing.
- It looks like a weather vane, but instead of having arrows to indicate the direction of the wind, it has four cups that measure the speed of the wind.
|
7. Which one of the following is not correctly matched –
(a) Anemometer – Wind speed
(b) Ammeter – Electric current
(c) Tacheometer – Pressure difference
(d) Pyrometer – High temperature
[U.P.P.C.S. (Pre) 1997]
Ans. (c) Tacheometer – Pressure difference
- A tacheometer is a special instrument used to quickly calculate the distance to a target.
- A pyrometer measures high temperatures, like those found in a furnace.
- An anemometer measures wind speed. An ammeter is a tool for measuring electric current, which is measured in amperes.
|
8. The device to measure electric current is –
(a) Voltmeter
(b) Ammeter
(c) Voltameter
(d) Potentiometer
(e) None of the above/More than one of the above
[65th B.P.S.C. (Pre) 2019]
Ans. (b) Ammeter
- Ammeters are tools used to find out how much electric current is flowing in a circuit.
- It can show the amount of current in amps, which can be either direct (DC) or alternating (AC) current.
|
9. A pyrometer is used to measure –
(a) Air pressure
(b) Humidity
(c) High temperature
(d) Density
[Chhattisgarh P.C.S. (Pre) 2011, U.P.P.C.S. (Mains) 2008, Uttarakhand P.C.S. (Pre) 2006, U.P.P.C.S. (Spl.) (Mains) 2004, U.P.P.C.S. (Pre) 1998]
Ans. (c) High temperature
- A Pyrometer is a tool used to measure high temperatures from a distance.
- It follows the Stefan-Boltzmann law, which states that the heat given off by something is related to its absolute temperature.
- It can be used to measure the temperature of the sun too.
|
10. Which one of the following devices is used to measure extremely high temperatures?
(a) Pyrometer
(b) Photometer
(c) Phonometer
(d) Pycnometer
[U.P. P.C.S. (Mains) 2016]
Ans. (a) Pyrometer
- A pyrometer is a tool used to measure extremely high temperatures, like those present in furnaces.
- Pyrometers measure the radiation being given off by the object whose temperature needs to be determined.
|
11. Which one of the following thermometers is known as a pyrometer?
(a) Thermo-electric thermometers
(b) Radiation thermometers
(c) Gas thermometers
(d) Liquid thermometers
[U.P. P.C.S. (Pre) 2016]
Ans. (b) Radiation thermometers
- A pyrometer is a tool used to measure the temperature of an object’s surface without touching it.
- It does this by detecting the infrared or visible radiation coming from the object.
|
12. The thermometer which used to measure 2000°C temperature is –
(a) Gas thermometer
(b) Mercury thermometer
(c) Total radiation pyrometer
(d) Steam pressure thermometer
[U.P.P.C.S. (Pre) 2009]
Ans. (c) Total radiation pyrometer
- A radiation pyrometer is used to measure extremely high temperatures, especially for surfaces or objects that can’t be touched or reached.
- The temperature is determined by measuring the heat coming off of the object.
|
13. Which one of the following can be used to measure temperature above 1500° C?
(a) Clinical thermometer
(b) Thermoelectric couple thermometer
(c) Platinum resistance thermometer
(d) Pyrometer
[U.P. Lower Sub. (Pre) 2013, U.P. U.D.A./L.D.A. (Spl.) (Pre) 2010]
Ans. (d) Pyrometer
- A pyrometer is a tool for measuring very high temperatures, above 1500 degrees Celsius.
|
14. ‘Pyrheliometer’ is used for measuring :
(a) Sunspots
(b) Solar radiation
(c) Air temperature
(d) Temperature of plants
[U.P.P.C.S. (Pre) (Re. Exam) 2015]
Ans. (b) Solar radiation
- There are two kinds of instruments used to measure sunlight, which are the Pyrheliometer and the Pyranometer.
|
15. What is measured by a manometer?
(a) Air pressure
(b) Pressure of gas
(c) Density of liquids
(d) Pressure of oil on the surface
[U.P.P.C.S. (Pre) 1990]
Ans. (b) Pressure of gas
- A manometer is a tool that measures the pressure of liquids or gases.
- It uses a tube filled with liquid to measure the pressure.
|
16. Match List-I with List-II and select the correct answer using the codes given below:
| List – I |
List – II |
| (Instrument) |
(Measuring quantity) |
| A. Ammeter |
1. Pressure |
| B. Hygrometer |
2. Weight |
| C. Spring balance |
3. Electric current |
| D. Barometer |
4. Relative humidity |
Code :
A B C D
(a) 2 3 4 1
(b) 3 4 2 1
(c) 4 1 2 3
(d) 1 2 3 4
[U.P.U.D.A./L.D.A (Pre) 2001]
Ans. (b) 3 4 2 1
- An ammeter is used to measure the electrical current in a circuit.
- A hygrometer is used to measure the amount of humidity in the air.
- A spring balance is a device used to determine different weights by measuring the tension of a spring. Lastly, a barometer is used to measure air pressure.
|
17. Which one of the following pairs is not correctly matched?
(a) Odometer: Measuring instrument for distance covered by motor wheels
(b) Ondometer: Measuring instrument for frequency of electromagnetic waves
(c) Audiometer: Device for measuring sound intensity
(d) Ammeter: A measuring instrument for electric power
[U.P. Lower Sub. (Pre) 2015]
Ans. (d) Ammeter: A measuring instrument for electric power
- A tool called an ammeter is used to measure electric current, but not electric power.
- Therefore, option (d) does not fit.
|
18. The device to measure electric current is
(a) Voltmeter
(b) Ammeter
(c) Voltameter
(d) Potentiometer
(e) None of the above / More than one of the above
[64th B.P.C.S. (Pre) 2018]
Ans. (b) Ammeter
- An ammeter is a device used to measure the electric current in a circuit.
- lectric current is the flow of electrons, and its unit of measurement is “ampere”.
- Therefore, the instrument used to measure the flow of electric current in amperes is an ammeter.
|
19. Which instrument is used to measure atmospheric pressure?
(a) Hydrometer
(b) Barometer
(c) Manometer
(d) Hygrometer
[U.P.P.S.C. (GIC) 2010, M.P.P.C.S. (Pre) 2000]
Ans. (b) Barometer
- A barometer is a tool used by meteorologists that measures air pressure.
- If the mercury inside the barometer suddenly drops, that usually means a thunderstorm is coming.
|
20. The liquid/liquids used in the simple barometer is /are :
(a) Water
(b) Mercury
(c) Alcohol
(d) All of the above
[M.P.P.C.S. (Pre) 2016]
Ans. (b) Mercury
- A barometer is a tool used to measure the air pressure. Different kinds of barometers exist, such as water-based, mercury, vacuum pump oil, and aneroid (nonliquid).
- Generally, a basic barometer has a glass tube that is closed at one end and open at the other, filled with mercury and placed upside down in a container of mercury.
|
21. The density of milk can be obtained by the use of :
(a) Hydrometer
(b) Butyrometer
(c) Lactometer
(d) Thermometer
[M.P.P.C.S. (Pre) 2006]
Ans. (c) Lactometer
- A lactometer measures how dense milk is while a butyrometer measures how much fat is in milk or milk products.
|
22. Relative humidity is measured by :
(a) Hydrometer
(b) Hygrometer
(c) Lactometer
(d) Potentiometer
[U.P.P.C.S. (Pre) 1996, U.P.P.C.S. (Pre) 1995]
Ans. (b) Hygrometer
- A hygrometer is used to figure out how humid the air is.
- A lactometer is used to measure the thickness of milk.
- A hydrometer measures the heaviness of liquids and a potentiometer measures the voltage in an electrical circuit.
|
23. Which instrument is used for measuring humidity in the air?
(a) Hydrometer
(b) Hygrometer
(c) Spectrometer
(d) Eudiometer
[Chhattisgarh P.C.S. (Pre) 2008]
Ans. (b) Hygrometer
- A hygrometer is a tool that measures the amount of humidity in the air.
- A spectrometer measures the properties of light across a certain range of the electromagnetic spectrum.
- A eudiometer is a laboratory device that measures the change in the volume of a gas mixture after a physical or chemical transformation.
|
24. A hygrometer is used to measure –
(a) Humidity in the atmosphere
(b) Atmospheric pressure
(c) High temperature
(d) Velocity of wind
[Uttarakhand Lower Sub. (Pre) 2010]
Ans. (a) Humidity in the atmosphere
- A hygrometer is a tool used to find out how much water is in the air, soil, or a small space.
- It was first made to measure the weather.
|
25. Which instrument is used to measure humidity?
(a) Hydrometer
(b) Hygrometer
(c) Pyrometer
(d) Lactometer
(e) None of the above / More than one of the above
[64th B.P.C.S. (Pre) 2018]
Ans. (b) Hygrometer
- An hygrometer is a tool used to measure the amount of water vapor in the air, soil, or an enclosed area.
- Devices that measure humidity typically measure other things too.
|
26. Which of the following device quantify the humidity in Air?
(a) Thermostat
(b) Pyrometer
(c) Hypsometer
(d) Hygrometer
[R.A.S./R.T.S. (Pre) 1996]
Ans. (d) Hygrometer
- A hygrometer is a tool that tells you how much humidity is in the air.
- A pyrometer is used to measure extreme heat, while a hypsometer is used to measure height or how high up you are. A thermostat is used to control the temperature by keeping it at a certain level.
|
27. Which of the following is correctly matched?
(a) Thermoresistor – Electronic Thermometer
(b) Capacitor – Thermometer
(c) Bipolar Junction Transistor – Rectifier
(d) Junction Diode – Amplifier
[U.P. R.O./A.R.O. (Pre) 2016]
Ans. (a) Thermoresistor – Electronic Thermometer
- A thermoresistor is an electronic thermometer that alters its resistance when the temperature changes.
- Thus, option (a) is the right answer.
|
28. Electroencephalogram (EEG) is used in monitoring
(a) Heart
(b) Liver
(c) Pancreas
(d) Brain
(e) None of the above / More than one of the above
[64th B.P.C.S. (Pre) 2018]
Ans. (d) Brain
- An EEG is a test that looks at the electrical activity of the brain.
- It is done by attaching tiny metal discs (electrodes) to the scalp.
- Brain cells always give off electrical signals, even when a person is sleeping.
- These signals show up as wavy lines on an EEG recording.
|
29. Match List I with List II and select the correct answer from the codes given below the lists :
| List-I |
List-II |
| A. Stethoscope |
1. To measure the intensity of light |
| B. Sphygmomanometer |
2. To check the purity of gold |
| C. Caratometer |
3. To hear heart sound |
| D. Luxmeter |
4. To measure blood pressure |
Code :
A B C D
(a) 1 2 3 4
(b) 4 3 2 1
(c) 3 4 2 1
(d) 2 1 4 3
[U.P.P.C.S. (Pre) 2008]
Ans. (c) 3 4 2 1
- The stethoscope is a tool that doctors use to listen to a patient’s heartbeat.
- A sphygmomanometer measures blood pressure.
- A caratometer is used to check the quality of gold.
- A lux meter is used to measure the brightness of light.
|
30. The name of the equipment used for measuring blood pressure is :
(a) Tacheometer
(b) Sphygmomanometer
(c) Actiometer
(d) Barometer
[U.P.P.C.S. (Pre) 2007]
Ans. (b) Sphygmomanometer
- Your doctor uses a device called a sphygmomanometer, or a blood pressure cuff, to measure your blood pressure.
- This cuff is placed around your upper arm and inflated to stop the flow of blood in your artery.
|
31. The apparatus used to measure the intensity of light is known as –
(a) Anemometer
(b) Colorimeter
(c) Luxmeter
(d) Altimeter
[U.P.P.C.S. (Spl) (Mains) 2004]
Ans. (c) Luxmeter
- A Luxmeter is a tool used to find out how bright a light is.
|
32. Radar is used for :
(a) Detecting objects by using light waves
(b) Refecting sound waves to detect objects
(c) Determining the presence and location of objects with radio waves
(d) Tracking rain-bearing clouds
[U.P.P.C.S. (Pre) 2008, U.P.P.C.S. (Pre) 1996, U.P.U.D.A./L.D.A. (Pre) 2001, U.P. Lower Sub. (Pre) 2004]
Ans. (c) Determining the presence and location of objects with radio waves
- RADAR stands for Radio Detection and Ranging. It means using radio waves to detect things like aircraft, ships, spacecraft, missiles, vehicles, weather patterns, and land.
- This technique can be used to figure out the range, angle, or speed of things.
- Nowadays, it is used for many different purposes.
|
33. Which of the following quantities is measured on the Richter scale?
(a) Speed of a glacier
(b) Population growth
(c) Intensity of an earthquake
(d) Temperature inside the earth
[R.A.S./R.T.S.(Pre) 2003]
Ans. (c) Intensity of an earthquake
- The Richter scale is the most commonly used way to measure the size of an earthquake.
- It was created in 1935 by Charles F. Richter of the California Institute of Technology.
- The Richter scale is used to measure how much energy is released during an earthquake.
|
34. The intensity of earthquakes is measured :
(a) On the Richter scale
(b) On the Kelvin scale
(c) In decibel
(d) In Pascal
[U.P. Lower Sub. (Pre) 2015, U.P. Lower Sub. (Pre) 2004]
Ans. (a) On the Richter scale
- The Richter scale, which was created in 1935 by Charles F. Richter from the California Institute of Technology, is used to measure the power of an earthquake.
|
35. The Richter scale is used for measuring –
(a) Velocity of sound
(b) Intensity of light
(c) Amplitude of seismic waves
(d) Intensity of sound
[U.P.P.C.S. (Spl) (Mains) 2008]
Ans. (c) Amplitude of seismic waves
- The Richter scale is used to measure how strong an earthquake is.
- It looks at the size of the seismic waves that reach the seismograph and assigns a number between 0 and 10 to measure the intensity.
|
36. Which one is not correctly matched?
(a) Celsius – Temperature
(b) Kilowatt hour – Electricity
(c) Rh factor – Blood
(d) Richter scale – Humidity
[Uttarakhand P.C.S. (Pre) 2002]
Ans. (d) Richter scale – Humidity
- The Richter scale is used to measure the strength of an earthquake, not humidity.
- The other pairs are matched correctly.
|
37. Which of the following is a seismometer device?
(a) Crescograph
(b) Seismograph
(c) Geiger Counter
(d) Raingauge
[U.P.P.C.S. (Pre) 1990]
Ans. (b) Seismograph
- Earthquakes create vibrations that can be tracked by a tool called a Seismograph.
- In the early 1900s, Sir Jagadish Chandra Bose invented a device to measure plant growth called a Crescograph.
- A Raingauge is used to measure rain and a Geiger Counter is a tool to detect radiation.
|
38. The intensity of an earthquake is measured by?
(a) Barometer
(b) Hydrometer
(c) Polygraph
(d) Seismograph
[M.P.P.C.S. (Pre) 2015]
Ans. (d) Seismograph
- Earthquakes create vibrations that can be picked up with a special tool called a Seismograph.
|
39. What does a ‘seismograph’ record?
(a) Heart-beats
(b) Atmospheric pressure
(c) Earthquake
(d) None of these
[M.P.P.C.S. (Pre) 1995]
Ans. (c) Earthquake
- A seismograph is a device that tracks and records the vibrations that happen after an earthquake.
- They are installed in the ground everywhere and they are connected to create a worldwide system.
|
40. Match List-I with List-II and select the correct answer from the codes given below the lists :
| List-I |
List-II |
| A. Earthquake |
1. Ammeter |
| B. Height |
2. Seismograph |
| C. Electric current |
3. Altimeter |
| D. Resistance |
4. Ohm |
Code :
A B C D
(a) 2 3 1 4
(b) 2 3 4 1
(c) 1 3 4 2
(d) 3 2 4 1
[U.P.P.C.S. (Pre) 1992]
Ans. (a) 2 3 1 4
- An altimeter is used to measure how high something is compared to a fixed point.
- An ammeter measures the amount of electricity flowing through a circuit.
- A seismograph is used to measure earthquakes and ohms are the unit of electrical resistance.
|
41. Match the correct :
| A. Fathometer |
1. Atmospheric pressure |
| B. Barometer |
2. Atmospheric humidity |
| C. Hygrometer |
3. Height |
| D. Altimeter |
4. Depth of sea |
Code :
A B C D
(a) 2 3 1 4
(b) 4 1 2 3
(c) 4 2 3 1
(d) 3 1 2 4
[Chhattisgarh P.C.S. (Pre) 2003]
Ans. (b) 4 1 2 3
- A fathometer is a tool used to figure out how deep water or a submerged object is using sound waves.
- A barometer measures air pressure, a hygrometer measures how much moisture is in the air, and an altimeter measures how high something is from the ground.
|
42. A Fathometer is used to measure :
(a) Earthquake
(b) Rain
(c) Depth of sea
(d) Sound intensity
[M.P.P.C.S. (Pre) 2015]
Ans. (c) Depth of sea
- A fathometer is a tool that tells how deep the water is by timing how long it takes for a sound wave to go from the top of the water to the bottom and back.
|
43. Match List-I with List-II and select the correct answer from the codes given below the lists :
| List – I |
List – II |
| A. Anemometer |
1. Earthquakes |
| B. Seismograph |
2. Atmospheric Pressure |
| C. Barograph |
3. Wind velocity |
| D. Hygrometer |
4. Humidity |
Code :
A B C D
(a) 1 2 3 4
(b) 4 1 2 3
(c) 4 1 3 2
(d) 3 1 2 4
[U.P.P.C.S. (Mains) 2012, Uttarakhand Lower Sub. (Pre) 2010]
Ans. (d) 3 1 2 4
- An anemometer measures the velocity of the wind.
- The seismograph detects and measures earthquakes.
- Barograph records changes in atmospheric pressure.
- A hygrometer measures the level of humidity.
|
44. Which one of the following is not correctly matched :
(a) Manometer – Pressure
(b) Carburetor – Internal combustion engine
(c) Cardiograph – Heart movement
(d) Seismometer – Curvature of surface
[U.P.P.C.S. (Pre) 1999, U.P.P.S.C. (GIC) 2010]
Ans. (d) Seismometer – Curvature of surface
- Seismometer measures seismic waves from earthquakes, carburetor mixes air and fuel for an engine, cardiograph records the movement of the heart, and manometer measures pressure with a column of liquid.
- Option (d) does not match.
|
45. A phonometer is used to measure which one of the following?
(a) The power of brightness of light
(b) Extremely high temperature
(c) Frequency of electromagnetic wave
(d) Atmospheric humidity
[U.P.P.C.S. (Mains) 2014]
Ans. (*)
- A phonometer is a tool used to measure how loud someone speaks. A photometer is used to measure the brightness of light.
|
46. The apparatus used for detecting lie is known as –
(a) Polygraph
(b) Pyrometer
(c) Gyroscope
(d) Kymograph
[U.P. Lower Sub. (Pre) 2013]
Ans. (a) Polygraph
- A Polygraph, also known as a lie detector, tracks changes in things like blood pressure, pulse, breathing, and skin conductivity while a person is asked and answers questions.
- A Pyrometer is a tool that measures the heat of an object from a distance.
- A Gyroscope is a wheel or disc that spins and can be pointed in any direction.
- A kymograph is a tool that records pressure changes, like those of the blood or muscles, by using a pen or stylus to mark a rotating drum.
|
47. The instrument, used for measuring angular distances in the vertical plane (elevation) and the horizontal plane (azimuth), is :
(a) Bevel protractor
(b) Altimeter
(c) Syncline
(d) Theodolite
[Chhattisgarh P.C.S. (Pre) 2020]
Ans. (d) Theodolite
- Theodolite is a tool that uses optics to measure the angles between two points in both the horizontal and vertical directions.
|
