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 geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

Hygrometer is the instrument used to measure _________.

  1. rainfall

  2. temperature

  3. humidity

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

Humidity,

A hygrometer is a weather instrument used to measure the humidity in the atmosphere. There are two main types of hygrometers -- a dry and wet bulb psychrometer and a mechanical hygrometer.

Multiple choice biology soil : our life soil properties soil - properties basics of soil pollution

Soil salinity is measured by

  1. Porometer

  2. Potometer

  3. Calorimeter

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

Soil salinity can be measured by conductivity meter, it is a device which measures electrical conductivity in a solution due to presence of salts or impurities

So, the correct answer is 'Conductivity meter'

Multiple choice geography sun: the ultimate source elements of weather and climate : temperature the atmosphere elements of weather and climate :humidity

Which of the following instruments is used for measuring relative humidity in air?

  1. Hydrometer

  2. Hygrometer

  3. Barometer

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

A hygrometer is the standard instrument used to measure the moisture content or relative humidity in the air. A hydrometer measures liquid density, and a barometer measures atmospheric pressure.

Multiple choice evs production of food from animals dairy farm management cattle farming uses of animals contribution of louis pasteur discoveries by louis pasteur discovery of microorganisms

The device used for measuring the quality of milk is_____________

  1. Respirometer

  2. Sphygmomanometer

  3. Lactometer

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

  • The device used for measuring the quality of milk is a lactometer. It is an instrument that measures the amount of water added and the volume of cream in the sample of milk. 
  • It works on the principle of gravity. It has many industrial applications where milk is tested and then used for making various products.

So, the correct answer is option C.

Multiple choice physics fluid pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

Atmospheric pressure can be measured by which of the following instruments

  1. doctor's thermometer

  2. mercury barometer

  3. speedometer

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

Speedometre is an instrument which is used to measure the speed of a vehicle.

Doctor's thermometre is used to measure the temperature of the body of the patient.
Mercury thermometre is used for measuring the atmospheric pressure.

Multiple choice physics fluid pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

A measurement referenced to the atmospheric pressure and it varies from the measurement of barometric reading and manometer reading is called as 

  1. gauge pressure

  2. absolute pressure

  3. atmospheric pressure

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

Absolute pressure: It uses absolute zero (pressure in vacuum) as its zero point.

Gauge pressure: It uses atmospheric pressure  as its zero point.
Therefore, Absolute pressure = Atmospheric pressure + Gauge pressure
A barometer reads the atmospheric pressure and a manometer reads absolute pressure (when closed from one end), therefore a measurement referenced to the atmospheric pressure varying from barometer reading and manometer is called as gauge pressure.

Multiple choice geography the challenging face of the earth and landforms the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

Element which is used to measure how cold or hot weather is __________.

  1. wind

  2. precipitation

  3. humidity

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

Temperature is a relative term implying a degree of molecular activity or heat of a substance. Temperature also refers to the degree of hotness. So temperature is used to measure how cold or hot the weather is. 

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure devices to measure pressure
The vacuum created in simple barometer is known as __________ vacuum

  1. Newton's

  2. Barometric

  3. Torricellian

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

A simple barometer or a mercury barometer has a glass tube closed at one end with an open mercury-filled reservoir at the base. The weight of the mercury creates a vacuum in the top of the tube known as Torricellian vacuum. 

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure devices to measure pressure

The liquid used in simple barometer is

  1. Glycerine

  2. Kerosene

  3. Mercury

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

A mercury barometer, or a simple barometer, has a glass tube, of length approximately 100cm, closed at one end with an open mercury-filled reservoir at the base. The weight of the mercury creates a vacuum in the top of the tube known as Torricellian vacuum. Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir. High atmospheric pressure places more force on the reservoir, forcing mercury higher in the column. Low pressure allows the mercury to drop to a lower level in the column by lowering the force placed on the reservoir. 

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

An apparatus used to demonstrate phototropism is 

  1. Luxmeter

  2. Solarometer

  3. Clinostat

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

Phototropism was first studied by Charles Darwin in 1880 in Canary Grass and oat coleoptiles. Later on F.W. Went in 1923, suggested the involvement of auxins in this phenomenon. Experimental approach to demonstrate positive phototropism in shoot tips is a darkened black box. The black box is having a small window at one side. A well-watered potted plant is placed inside the box. The is referred to as a phototropic chamber or heliotropic chamber. The window is kept closed for about 24 hours and the plant shows normal growth. If the window is kept opened, it is found after two days, that the shoot tip bends and grows towards light proving that it is positively phototropic.

Multiple choice evs the unique world of insects and animals sleeping time animal senses sense organs in animals sense organs in humans

Which of the following detect mechanical energy associated with, changes in pressure, position, or acceleration?

  1. Chemoreceptors

  2. Photoreceptors

  3. Mechanoreceptors

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

(A)Chemoreceptor - Receptor that responds to chemicals.

(B)Photoreceptor - Receptor that responds to light.
(C)Mechanoreceptor - Receptor that responds to pressure, position, acceleration.
(D)Thermoreceptor -Receptor that responds to heat.
So, the correct option is 'Mechanoreceptor'.

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

Mercury is generally used in thermometer because it has a

  1. High fluidity

  2. High density

  3. High coefficient of expansion

  4. High specific heat
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Most metals are good conductors of heat and they are solids at room temperature. Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.