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 physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

________ is an instrument used to measure the atmospheric pressure.

  1. Barometer

  2. Calorimeter

  3. Thermometer

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

Barometer is the instrument used to measure atmospheric pressure.

calorimeter and thermometer is used to measure temperatture.
speedometer is used to measure the speed of the vehicles.
so option (A) is correct

Multiple choice physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

The empty space above mercury in a simple barometer is called _______vaccum

  1. pressure

  2. barometric

  3. torricellian

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

Torricellian vacuum
The vacuum formed when a long tube, closed at one end and filled with mercury, is inverted into a mercury reservoir so that the open end of the tube is below the surface of the mercury. The pressure inside the Torricellian vacuum is the vapour pressure of mercury, about $103\ torr.$

Multiple choice physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

Barometer is used for measuring:

  1. Liquid pressure

  2. Thrust

  3. Atmospheric pressure

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

A barometer is a device used for measuring atmospheric pressure.

A classic mercury barometer is constructed from a 3-foot glass tube that is open at one end and sealed at the opposite end. The glass tube is filled with liquid mercury and rests upside-down in a reservoir of mercury. As the mercury moves down the glass tube, a vacuum is created. When the atmospheric pressure above the reservoir increases, the mercury inside the tube rises. As atmospheric pressure decreases the mercury moves down the tube, into the reservoir.The change in the mercury level in the glass tube is equal to the pressure exerted by the air above the reservoir and is measured using the scale marked on the glass tube. 

Multiple choice physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

A manometer is used to measure

  1. Height

  2. Pressure

  3. liquid density

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

A manometer is any device used to measure pressure. However, the word manometer is commonly used to mean a pressure sensor which detects pressure change by means of liquid in a tube.
Manometers are differential pressure sensors. A differential pressure sensor measures the difference between a pressure being applied to it and a reference pressure (often atmospheric pressure). 

Multiple choice physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

Atmospheric pressure is measured by

  1. Barometer

  2. Manometer

  3. Screw gauge

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

Answer is A.

A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A simple barometer consists of a long glass tube (closed at one end, open at the other) filled with mercury and turned upside down into a container of mercury. The barometer works by balancing the mercury in the glass tube against the outside air pressure, just like a set of scales. As air pressure increasesthat is, as the air becomes heavierit pushes more of the mercury up into the tube. As air pressure decreases, more of the mercury drains from the tube. So the level of mercury in the tube provides a precise measure of air pressure.

Multiple choice physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

Match the following.

List-I(Measuring Instruments) List-II(Which measure)
A. Anemometer $1$. Motor Power
B. Tachometer $2$. Wind speed
C. Dynamometer $3$. Revolutions per minute
D. Barometer $4$. Atmospheric pressure
$5$. Current from a dynamo
  1. A-$2$, B-$3$, C-$1$, D-$4$
  2. A-$2$, B-$1$, C-$3$, D-$4$
  3. A-$1$, B-$3$, C-$5$, D-$4$
  4. A-$1$, B-$3$, C-$5$, D-$2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Anemometers measure wind speed (A-2), tachometers measure RPM (B-3), dynamometers measure power/force (C-1), and barometers measure atmospheric pressure (D-4). This matches option A.

Multiple choice physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

The device used for producing current is called a _____.

  1. Voltmeter

  2. Ammeter

  3. Galvanometer

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

In electricity generation A generator is a device which uses mechanical energy to produce electrical energy which flows in form of electric current in circuits. hence Generator can produce current.

Multiple choice biology modern agriculture modern equipments in agriculture soil quality methods of crop production

Which of the following tool is used for measuring the draft of agricultural implements? 

  1. Dynamometer

  2. Hydrometer

  3. Galvanometer

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

(A) Dynamometer- It is an instrument/device used for measuring mechanical force or power transmitted by a rotating shaft. For example, it is used to calculate the power produced by a motor or an engine in agricultural fields

(B) Hydrometer- It is a device used for measuring the relative density of liquids. It is made up of a thin glass tube and consists a bulb which floats upright.
(C) Galvanometer- It is a device used for measuring or detecting the flow of electric current through an electric circuit.
(D) Barometer- It is a device used to measure atmospheric pressure. This device is mostly used by the weather forecasters to predict the changes in the weather.
So, the correct option is 'Dyanamometer'.

Multiple choice botany plant breeding method of plant breeding for crop improvement plant breeding for food production biotechnology

Which of the following instrument can be used to record plant growth by seconds?

  1. Porometer

  2. Potometer

  3. Pressure bomb

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

A crescograph is a device for measuring growth in plants. It was invented in the early 20th century by Sir Jagadish Chandra Bose. The Bose crescograph uses a series of clockwork gears and a smoked glass plate to record the movement of the tip of a plant (or its roots) at magnifications of up to 10,000. Marks are made on the plate at intervals of a few seconds, demonstrating how the rate of growth varies under varying stimuli. Bose experimented with temperature, chemicals, gases and electricity.

Thus, the correct answer is option D.

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

Select the instrument that works on the principle of multiple reflection of sound.

  1. Watthour meter

  2. Sonar

  3. Stethoscope

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

The sound of a heartbeat ( or lungs ) reaches the doctor's ears by the multiple reflections of sound waves though the stethoscope tube.