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 zoology selection and evolution extinction extinctions environmental science

An instrument which measures concentration of C-14 directly is

  1. Accelerator mass spectrometer

  2. Spectroscope

  3. Geiger counter

  4. All the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Accelerator Mass Spectrometry (AMS) is the most precise method for directly measuring the concentration of C-14 isotopes in a sample.

Multiple choice biology physical resources air and winds wind energy air as a natural resource

The instrument which measures wind velocity is

  1. Lactometer

  2. Anemometer

  3. Hydrometer

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

Anemometer is the instrument used to measure wind velocity. Hydrometer measures specific gravity (or relative density) of liquids. Barometer is used to measure atmospheric pressure. Lactometer measures cream content of milk.

Multiple choice biology physical resources air and winds wind energy air as a natural resource

The instrument which measures wind velocity is

  1. Lactometer

  2. Anemometer

  3. Hydrometer

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

An anemometer is the standard instrument used to measure wind speed or velocity. A barometer measures atmospheric pressure, a hydrometer measures liquid density, and a lactometer measures the purity of milk.

Multiple choice geography in search of the source of wind variations in atmospheric pressure properties of air pressure belts

Altimeter is a device to measure  ____________.

  1. Temperature

  2. Height

  3. Altitude

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

Altimeter is an instrument that measures the height of the land surface or any object such as an airplane. The most common types of altimeters are barometric. They determine altitude by measuring air pressure. As altitude increases, air pressure decreases. This is because the density of air is lower at high altitudes. Altimeters are important navigation instruments for aircraft and spacecraft pilots who monitor their height above the Earth’s surface. Skydivers and mountaineers also use altimeters to pinpoint their location in the sky or on the ground.

Multiple choice geography in search of the source of wind variations in atmospheric pressure properties of air pressure belts

Which one of the following is used for measuring the speed of wind ?

  1. Hygrometer

  2. Barometer

  3. Anemometer

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

Anemometer is a device which is used for measuring the speed of wind in the atmosphere. It also measures wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. They are also important to the work of physicists, who study the way air moves. Anemometer has three or four cups attached to horizontal arms. The arms are attached to a vertical rod. As the wind blows, the cups rotate, making the rod spin. The stronger the wind blows, the faster the rod spins. The anemometer counts the number of rotations, or turns, which is used to calculate wind speed.

Multiple choice geography world of diversities elements of weather and climate :rainfall and air pressure diversified world environmental regions (zones)

Mercury or alcohol is used in the thermometers.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mercury or alcohol is used in the thermometers. A thermometer is a device that is used to measure the temperature. Alcohol thermometer and mercury thermometer are two types of thermometers that are composed of a bulb and a marked glass tube. The main difference between alcohol and mercury thermometer is that the bulb of mercury thermometer is filled with mercury whereas the bulb of alcohol thermometer is filled with alcohol. The alcohol thermometers are less toxic, whereas the mercury thermometers are highly toxic. 

Multiple choice biology absorption by roots - the processes involved root pressure transportation in plants factors affecting the transport of water and minerals in plants

Root pressure can be measured by

  1. Attaching a barometer to the cut end of the stem

  2. Attaching a manometer to the cut end of the stem

  3. Attaching a thermometer to the cut end of the stem

  4. Attaching a potometer to the cut end of the stem.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The root pressure can be measured by attaching a suitable mercury manometer to the cut end of the stem. Root pressure provides a force which causes pushing of water in the stem. A continuous flow of water is maintained in the plants because the leaves transpire water through stomata and to replace the lost water the water drawn by the roots moves up.

Multiple choice biology absorption by roots - the processes involved root pressure transportation in plants factors affecting the transport of water and minerals in plants

Choose the correct answers from the alternatives given.
Root pressure can be measured by

  1. Osmometer

  2. Potometer

  3. Manometer

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

Different processes can be measured by various apparatus.

A. Osmometer is used to measure osmotic pressure (pressure needed to stop the solvent to pass through the semi-permeable membrane).
B. Potometer is used to measure transpiration rate (the rate at which transpiration occurs).
C. Manometer is used to measure the root pressure (pressure that is exerted by roots such that it allows sap to rise through the plant stem to the leaves).
D. Porometer is used to measure stomatal conductance in leaves.
Hence, the correct answer is 'Manometer'.

Multiple choice botany breath and blood of life stomata and transpiration transport in organisms long distance transport of water different types of circulatory systems

Which is used to measure the rate of transpiration?

  1. Atmometer

  2. Psychrometer

  3. Potometer

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

Atmometer is a device used to measure the rate of water evaporation from a wet surface to the atmosphere and can be used to measure the rate of evapotranspiration. 

A psychrometer is a device used to measure the rate of relative humidity in the atmosphere. 
Potometer is a device used to measure the rate of water uptake by plants  porometer is a device used to measure the area of the stomatal opening of leaves.
 So, the correct answer is 'Potometre'.

Multiple choice physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

A mercury thermometer, with a concave reflector behind the bulb, is placed in front of an electric fire. Which of the following combinations will cause the smallest reading on the thermometer?

  1. Black reflector, black bulb

  2. Black reflector, shiny bulb

  3. Shiny reflector, shiny bulb

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

A mercury thermometer, with a concave reflector behind the bulb, is placed in front of an electric fire.Black reflector, shiny bulb combinations will cause the smallest reading on the thermometer The black coating absorbs energy and warms up and warms the bulb by conduction.