Physics · General Awareness

Physics Measuring Instruments

1,123 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.

Pressure and humidity instrumentsElectrical measuring devicesMedical physics toolsNavigational instruments

Physics Measuring Instruments Questions

Multiple choice

Electroscope is used to

  1. Measure the temperature

  2. Check presence of charge

  3. Presence of magnetism

  4. Presence of conductivity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An electroscope is a device that can be used to test for the presence of charge, or that can be charged. An electroscope is made from conducting material (generally metal). Charge is free to flow on a conductor, and if you put charge at a particular point it will distribute itself over the surface of the conductor.

Multiple choice

Blood pressure is measured by an instrument called

  1. electrocardiogram

  2. pulse rate

  3. sphygmomanometer

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

Blood pressure is measured by an instrument called sphygmomanometer. It is composed of an inflatable cuff to restrict blood flow and a mercury or mechanical manometer to measure the pressure.

Multiple choice

What does ampere measure?

  1. Sound

  2. Temperature

  3. Electric current

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

The ampere is the SI base unit of electric current, representing the flow of electric charge across a surface at the rate of one coulomb per second.

Multiple choice

Hygrometer is used to measure

  1. the humidity of the atmosphere

  2. the density of milk

  3. the speed of sound in water

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A hygrometer is a scientific instrument used to measure the humidity, or the amount of water vapor, in the air.

Multiple choice

In a barometer, mercury is preferred over water because

  1. mercury is a good conductor of heat

  2. mercury is shining and therefore its level can be read easily

  3. mercury is available in pure form

  4. mercury has high density and low vapour pressure
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mercury is preferred because its high density allows for a much shorter tube compared to water, and its low vapour pressure prevents it from evaporating into the vacuum space.

Multiple choice

The instrument Dynamometer is used to measure

  1. quantities of heat

  2. electrical power

  3. longitude of a vessel at sea

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A dynamometer is a device used to measure force, torque, or power. In many contexts, it is used to measure the power output of engines or motors.

Multiple choice

Which of the following instruments is used to measure of emf?

  1. Galvanometer

  2. Voltmeter

  3. Ammeter

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

A potentiometer is used to measure electromotive force (emf) accurately by balancing it against a known potential difference. Voltmeters measure potential difference but are less accurate for emf.