Physics ยท General Awareness

Physics Measuring Instruments

1,180 Questions

Physics measuring instruments are essential tools used to measure various physical quantities. This topic covers devices like hygrometers, oscilloscopes, and sphygmomanometers. It is a highly scoring section in general science and general awareness examinations.

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Physics Measuring Instruments Questions

Multiple choice

The accuracy of a measurement is determined by:

  1. Precision

  2. Resolution

  3. Sensitivity

  4. Range
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Precision refers to the closeness of a set of measurements to each other, while accuracy refers to the closeness of a measurement to the true value. Therefore, precision is a determining factor for accuracy.

Multiple choice

Which instrument is used to measure alternating current (AC)?

  1. Ammeter

  2. Voltmeter

  3. Ohmmeter

  4. Wattmeter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An ammeter is used to measure alternating current (AC) by measuring the flow of charge through a circuit.

Multiple choice

Which of the following instruments is used to measure resistance?

  1. Voltmeter

  2. Ammeter

  3. Ohmmeter

  4. Wattmeter
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An ohmmeter is used to measure resistance by applying a known voltage across a circuit and measuring the resulting current.

Multiple choice

Which of the following is a type of transducer that converts mechanical motion into an electrical signal?

  1. Thermocouple

  2. Strain Gauge

  3. Photodiode

  4. Hall Effect Sensor
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A strain gauge is a type of transducer that converts mechanical motion into an electrical signal by measuring the change in resistance of a conductor when it is subjected to strain.

Multiple choice

Which of the following is a type of digital multimeter (DMM)?

  1. Analog Multimeter

  2. True RMS Multimeter

  3. Clamp Meter

  4. Megohmmeter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A true RMS multimeter is a type of digital multimeter that measures the true root mean square (RMS) value of an AC signal, providing a more accurate reading than an average-responding multimeter.

Multiple choice

Which of the following is a type of oscilloscope?

  1. Analog Oscilloscope

  2. Digital Oscilloscope

  3. Mixed-Signal Oscilloscope

  4. Vector Oscilloscope
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A digital oscilloscope is a type of oscilloscope that uses analog-to-digital conversion (ADC) to convert the input signal into a digital signal, allowing for more precise measurements and analysis.

Multiple choice

The resolution of a digital instrument refers to its ability to:

  1. Measure small changes in a signal

  2. Measure signals over a wide range

  3. Measure signals with high accuracy

  4. Display measurements in a clear and readable format
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The resolution of a digital instrument refers to its ability to measure small changes in a signal, typically expressed in the number of digits or bits used to represent the measurement.

Multiple choice

Which of the following is a type of sensor used to measure temperature?

  1. Thermocouple

  2. Strain Gauge

  3. Photodiode

  4. Hall Effect Sensor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A thermocouple is a type of sensor used to measure temperature by converting the temperature difference between two dissimilar metals into an electrical signal.

Multiple choice

Which of the following is a type of instrument used to measure power?

  1. Wattmeter

  2. Voltmeter

  3. Ammeter

  4. Ohmmeter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A wattmeter is a type of instrument used to measure power by measuring the voltage and current in a circuit.

Multiple choice

What is the name of the device used to measure the speed of a swimming pool?

  1. Stopwatch

  2. Tachometer

  3. Speedometer

  4. Flow meter
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A flow meter is a device used to measure the speed of a swimming pool by measuring the flow rate of water.

Multiple choice

What is the name of the device used to maintain the pH level of swimming pools?

  1. pH meter

  2. pH adjuster

  3. pH controller

  4. pH stabilizer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A pH controller is a device used to maintain the pH level of swimming pools by automatically adding chemicals to adjust the pH.

Multiple choice

What is the name of the device used to test the water quality of swimming pools?

  1. Water test kit

  2. Pool tester

  3. Water analyzer

  4. Water quality monitor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A water test kit is a device used to test the water quality of swimming pools by measuring the levels of various chemicals, such as chlorine, pH, and alkalinity.

Multiple choice

How is the water pressure inside a penstock measured?

  1. Using a pressure gauge

  2. Using a flow meter

  3. Using a thermometer

  4. Using a voltmeter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pressure gauges are used to measure the water pressure inside a penstock. These gauges are installed at various points along the penstock to monitor the pressure and ensure that it remains within safe limits.

Multiple choice

Which kitchen tool is used to measure and pour liquid ingredients accurately?

  1. Measuring Cup

  2. Measuring Spoon

  3. Kitchen Scale

  4. Graduated Cylinder
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Measuring cups are commonly used in cooking to measure and pour liquid ingredients accurately, ensuring the correct proportions in recipes.

Multiple choice

Which of the following is a measure of the consistency of a measurement instrument?

  1. Validity.

  2. Reliability.

  3. Sensitivity.

  4. Specificity.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Reliability refers to the consistency of a measurement instrument in producing the same results under similar conditions.