Tag: thermometers

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Questions Related to thermometers

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

The boiling point of mercury is 367$^o$C. A mercury thermometer can be used to measure a temperature of 500$^o$C;

  1. by filling the space above mercury with oxygen at high pressure

  2. by filling the space above mercury with nitrogen at low pressure

  3. by filling the space above mercury with nitrogen at high pressure

  4. by keeping the space above mercury as vacuum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The mercury thermometer can be used above its boiling point by filling up the space above mercury with nitrogen at high pressure because as pressure increases, boiling point also increases.

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

A clinical thermometer reads temperature from

  1. $35^oC to \ 42^oC$

  2. $0^oC to \ 100^oC$

  3. $25^oC to \ 42^oC$

  4. $35^oC to \ 62^oC$
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 sensitive as mercury level rises 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 $35°C$ to $42°C.$
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 physics heat - measurement thermometers application of various thermometric scales different types of thermometers

When a mercury thermometer is inserted in a pot of hot water and the reading is recorded , what temperature is being 

  1. Average temperature of water and surroundings

  2. Average temperature of thermometer

  3. Average temperature of water and thermometer

  4. Temperature difference between water and surroundings
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In this process, thermal equilibrium will eventually be reached after inserting the thermometer in hot pot. Hence heat is transferred from the water to the thermometer. 

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

The steam point and the ice point of a mercury thermometer are marked $80^0$ and $20^0.$  what will be the temperature in centigrade mercury scale when this thermometer reads $32^0$

  1. $20 ^ { 0 } \mathrm { C }$

  2. $5 ^ { 0 } \mathrm { C }$

  3. $10 ^ { 0 } \mathrm { C }$

  4. $26 ^ { 0 } \mathrm { C }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$(x-20)/(80-20) =(C-0)/(100-0)$
$(x-20)/60=(C-0)/100$

Now, given question$,$
$x=32 $
then$ ,$
$(32-20)/60=(C-0)/100$
$12/60=C/100$
$C=20^0$
hence in centigrade thermometer $20^0C$
Hence,
option $(A)$ is correct answer.

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

Mercury is often used in clinical thermometers. Which one of the following properties of mercury is not a reason for this ?

  1. The coefficient of the thermal expansion is large

  2. It is shiny

  3. It is a liquid at room temperature

  4. It has high density.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Mercury is used in thermometer as it has high coefficient of  expansion so even the highest change can be observed, it is spiny So you can see the level of mercury clearly and it is liquid for a wide range of temperature.
Hence, OPTION : D (density).