Physics · 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

Which instrument is used to measure earthquake?

  1. Richter scale

  2. Polygraph

  3. Seismograph

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A seismograph is an instrument used to detect and record seismic waves caused by earthquakes. The Richter scale is a scale used to measure the magnitude, not the instrument itself.

Multiple choice

Used to measure volume precisely.

  1. Graduated Cylinder

  2. Magnifying Glass

  3. Triple Beam Balance

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

A graduated cylinder is specifically designed with markings to measure the volume of liquids with high precision compared to beakers.

Multiple choice

The definition of volume is

  1. the amount of matter in a object

  2. the amount of matter in an object

  3. the amount of space an object takes up

  4. how loud an object is
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Volume is the measure of the three-dimensional space occupied by an object or substance.

Multiple choice

What is used to measure the quality of the air?

  1. ABC

  2. EPA

  3. API

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

The Air Quality Index (AQI) is the standard tool used by government agencies to communicate how polluted the air currently is or how polluted it is forecast to become. EPA is an agency, not a measurement tool.

Multiple choice physics measurements and units measuring mass measurement of mass measuring instruments

In a physical balance, when the beam is released with empty pans, the successive left and right turning points are obtained as 5; 6, 6 and 18, 18 respectively. After placing the substance whose mass is to be determined and when beam is released, the resting point obtained is 13. When 10 mg is added to the pan, the resting point is obtained as 11. If the mass at LRP is 60 g, the correct mass of the body corrected to a milligram is ______ g. 

  1. 59.996

  2. 56.5

  3. 59.99

  4. 56.599
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The resting point (RP) is the average of the turning points. For empty pans, RP = (5+18)/2 = 11.5. With the substance, RP = 13. With 10 mg added, RP = 11. The sensitivity is (13-11)/10 mg = 0.2 divisions/mg. The displacement from the empty pan RP is 13-11.5 = 1.5 divisions. Mass = 1.5 / 0.2 = 7.5 mg. Since the LRP mass is 60 g, the object mass is 60 g - 0.0075 g = 59.9925 g, which rounds to 59.993 g. Given the options, 59.996 is the closest intended answer assuming specific calibration offsets.