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 heat - measurement thermometers application of various thermometric scales different types of thermometers

Human body temperature is well measured by 

  1. A clinical thermometer

  2. A laboratory thermometer

  3. Thermostat

  4. Both A & B can be used
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A clinical thermometer is a thermometer used to measure human body temperature. Most old ones use mercury thermometer. It is accurate and sensitive, because it has a narrow place where the mercury level rises very fast.

These thermometers are used in clinics by doctors, so they are also called a doctor's thermometers or medical thermometers. Most of them show both Celsius scale and Fahrenheit temperature scales. The scale runs from 35 degree Celsius to 42 degree Celsius.

Medical thermometers are cleaned before and after each use, with alcohol.

It has a kink which does not allow the mercury level to fall on its own.
Multiple choice physics heat - measurement thermometers application of various thermometric scales different types of thermometers

A clinical thermometer can not be used to measure

  1. Room temperature

  2. Human body temperature

  3. Temperature of a boiling water

  4. Temperature of a lake water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
clinical Thermometer (or doctor's thermometer) is used for measuring a person's temperature. 
The temperature range that is marked on a clinical thermometer is about $35^oC$ to $43^oC$ (or $ 95^oF$ to $109^oF). $
After a clinical thermometer has been used to record a patient's temperature, the mercury is prevented from contracting into the glass bulb by the constriction kink.
Hence cannot be used to measure temperature of boiling water which is about $100^oC$
Multiple choice physics heat - measurement thermometers application of various thermometric scales different types of thermometers

A laboratory thermometer can not be used to measure

  1. Temperature of ice

  2. Temperature of pond water

  3. Temperature of human body

  4. Temperature of boiling water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Laboratory thermometer are used to take measurements in laboratories mainly. They can't be used to measure body temperature of a human. It is because of two reasons.  :
$(1)$ Due to vast difference in the range of operating temperature.
$(2)$ Due to difference in time for which the indicated temperature is held at that level.
Hence, the answer is Temperature of human body.
Multiple choice physics heat - measurement thermometers application of various thermometric scales different types of thermometers

Choose the correct answer from the alternatives given :
For measuring very high temperature, we use

  1. Mercury thermometer

  2. Thermoelectric pyrometer

  3. Platinum resistance thermometer

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Thermoelectric pyrometer is an instrument which uses one or more thermocouples to measure high temperature . 

Hence, option B is correct.

Multiple choice physics heat - measurement thermometers application of various thermometric scales different types of thermometers

At low temperatures ................. type of thermometer is used.

  1. mercury thermometer

  2. water thermometer

  3. alcohol thermometer

  4. thermometers cannot be used
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Alcohol thermometer.
Alcohol expands uniformly.

It has a low freezing point (-115 degree centigrade) therefore it is very suitable for the place where the temperature gets very low.
It is an easily available cheap liquid, which is safe to use.
Alcohol is cheaper than mercury, and if you break the thermometer, it is not toxic.

Multiple choice physics heat - measurement thermometers application of various thermometric scales different types of thermometers

Boiling water can be measured by 

  1. Clinical thermometer

  2. Laboratory thermometer

  3. Both may be used conveniently

  4. Both of them can not be used
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Laboratory thermometers are used to measure temperatures or temperature changes with a high degree of precision. That's why these are mainly used in laboratories. For exp : To measure boiling points of solutions, water etc. They are made up of glass and strength through thermal tempering or annealing. Types : liquid-in-glass, bimetallic strip, infrared based thermometer.
Hence, the answer is Laboratory thermometer.
Multiple choice physics heat - measurement thermometers application of various thermometric scales different types of thermometers

The clinical thermometer is designed to measure the temperature of

  1. Human body

  2. Bodies kept in refrigerators

  3. Room temperature

  4. boiling water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A Clinical thermometer is a thermometer used to measure human body temperature. Most made in $20th$ century are mercury-in-glass thermometers. They are very fast with small variation in temperature. Most of these thermometers shows Celsius and Fahrenheit ( medical thermometer ) scales and runs from $35°C$ to $42°C.$
Hence, the answer is Human body.
Multiple choice physics heat - measurement thermometers application of various thermometric scales different types of thermometers

What is the use of kink near the bulb in clinical thermometer

  1. It prevents the level of the mercury from falling when taken out of the mouth

  2. It allows the level of the mercury to fall when taken out of the mouth

  3. It allows the level of the mercury to rise when taken out of the mouth

  4. It prevents the level of the mercury from rising when taken out of the mouth
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation
Since, in clinical thermometer, mercury is used and level of mercury rises very rapidly with small variation in temperature that's why thermometers provided with kink near the bulb so it prevents the level of mercury from falling when taken out of mouth.
Hence, the answers are it prevent the level of the mercury from falling when taken out of the mouth, it allows the level of the mercury to fall when taken out of the mouth.
Multiple choice biology properties of natural resources the concept of bernoulli's principle variations in atmospheric pressure air exerts pressure

Which of the following can show the direction of wind ?

  1. Anemometer

  2. Wind wane

  3. Wind mill

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

Anemometer: Used to measure the speed of the wind.


Wind wane: Used to show the direction of wind.


Windmill: Converts wind energy to rotational energy.

Barometer: Used to measure atmospheric pressure. 


Hence, option B is correct.

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

The temp of the sun is measured with

  1. platinum thermometer

  2. gas thermometer

  3. pyrometer

  4. vapour pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A pyrometer is a non-contacting device that intercepts and measures thermal radiation, a process known as pyrometry. This device can be used to determine the temperature of an object's surface.  As the temperature of the sun is very high, a non-contact type temperature measurement is needed. So pyrometer will be used to measure the temperature of the sun.
Multiple choice evs circulation of blood blood transfusion transfusion of blood blood and organ donation

Which of the following can be used to make a stethoscope at home?

  1. Rubber tube

  2. Balloon

  3. Funnel

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

Steps to construct a stethoscope at home:

1) Take a funnel and put its small end at one end of the flexible tube. Push the funnel as far as u can into the tube.
2) Tape the funnel using suitable tape.
3) Inflate the balloon to stretch it out. Let the air out and then cut the neck of the ballon.
3) Stretch the remaining part of the balloon tightly over the open end of the funnel, and tape it. This creates the tympanic membrane for the stethoscope
4) Place the funnel end of the stethoscope on to the chest and end of the tube to the ear to listen to the heartbeat.
Hence rubber tube, balloon and funnel can be used to make a stethoscope at home.
So, the correct answer is 'All of the above'.

Multiple choice evs solar energy water cycle earth's energy budget solar energy and its applications

The sun radiates electromagnetic energy at the rate of $3.9 \times 10^{26}W$. Its radius is $6.96\times 10^8m$.The intensity of sun light at the solar surface will be $-(in \, W/m^2)$

  1. $1.4 \times 10^4$
  2. $2.8 \times 10^5$
  3. $4.2 \times 10^6$
  4. $5.6 \times 10^7$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$I=\frac { P }{ { 4\pi { R^{ 2 } } } } =\frac { { 3.9\times { { 10 }^{ 26 } } } }{ { 4\times 3.14\times { { \left( { 6.96\times { { 10 }^{ 8 } } } \right)  }^{ 2 } } } } =5.6\times { 10^{ 7 } }w/{ m^{ 2 } }$

Multiple choice physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

In the vacuum suspended system, the brakes are applied when

  1. Atmospheric pressure is applied to one side of diaphram

  2. Vacuum is applied to both sides of diaphram

  3. Atmospheric pressure is applied to both sides of diaphram

  4. Vacuum is applied to one side of diaphram
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the vacuum suspended system, the brakes are applied when atmospheric pressure is applied to one side of diaphram.