Tag: thermometers

Questions Related to thermometers

The range of clinical thermometer is $\displaystyle 35^{0}$ to $\displaystyle 43^{0}$

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

  1. True

  2. False

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Correct Option: A
Explanation:

The above statement is true.

The typical range of a sub-lingual thermometer for use in humans is from about $35 °C$ to $42 °C$ or $90 °F$ to $110 °F.$

Among the following what should not be done while or before using a clinical thermometer?

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

  1. Ensure that before use the mercury level is below $35\ ^0C$.

  2. Wash the thermometer with hot water.

  3. Handle the thermometer with care, as you handle any glass articles.

  4. Don't hold the thermometer by the bulb while reading it.

Show answer
Correct Option: B
Explanation:

(A) The mercury level should be below $35^{o}C$ or $94^{o}F$ , because minimum reading of a clinical thermometer is $35^{o}C$ hence it must be at lowest level to measure the right temperature .

(B) If we wash thermometer with hot water , mercury will expand due to heat given by hot water and will rise to a higher temperature. If the water is very hot , it may result in the damage of thermometer .Hence it must not be done .
(C) It must be handled with care as being made of glass and mercury inside it is poisonous .
(D) If we hold the bulb by our hand , thermometer will take heat from hand and will show a wrong reading hence we should not hold it by bulb 

The range of clinical thermometer is between:

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

  1. $45 ^\circ C$ and $52 ^\circ C$

  2. $25 ^\circ C$ and $32 ^\circ C$

  3. $65 ^\circ C$ and $72 ^\circ C$

  4. $35 ^\circ C$ and $42 ^\circ C$

Show answer
Correct Option: D
Explanation:

The range of clinical thermometer is from $35^{o}C$ or $94^{o}F$  to $42^{o}C$ or$108^{o}F$.

Before using the clinical thermometer mercury level should be below:

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

  1. $ 45 ^\circ C$

  2. $ 35 ^\circ C$

  3. $ 95 ^\circ C$

  4. $ 55 ^\circ C$

Show answer
Correct Option: B
Explanation:

The mercury level should be below $35^{o}C$ or $94^{o}F$, because minimum temperature of human body can not be below $35^{o}C$. Hence, it must be at lowest level to measure the temperature of human body correctly.

__________thermometers include two different metals that are bonded together and expand at different rates as they warm up.

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

  1. Liquid in glass

  2. Gas

  3. Bimetallic strip

  4. Resistance

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Correct Option: C
Explanation:

Bimetallic thermometer include two different metals , bonded together . These two metals have different coefficients of thermal expansion , due to this they expand or contract at different rates , when put into a temperature change together .This is the principle of a bimetallic thermometer .

 Water cannot be used as a liquid in a thermometer because it has:

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

  1. higher freezing point and lower boiling point than other thermometric liquids

  2. lower freezing point and higher boiling point than other thermometric liquids

  3. low specific heat capacity

  4. transparent colour

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Correct Option: A
Explanation:

Water cannot be used in thermometer because of its higher freezing point and lower boiling point than other liquids .  If water is used in a thermometer , it will start phase change at $0^{o}C$ and $100^{o}C$ and will not measure temperature , out of this range . This range is very small as compared  to other liquids as mercury , having freezing point about $-39^{o}C$ and boiling point $356^{o}C$ .

Our body temperature cannot fall below:

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

  1. $37 ^\circ C$

  2. $35 ^\circ C$

  3. $40 ^\circ C$

  4. $42 ^\circ C$

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Correct Option: B
Explanation:

Our body temperature cannot fall below $35^{o}C$ or $95^{o}F$ , because below this temperature body will suffer hypothermia .

The normal temperature of human body is ____________.

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

  1. $27^oC$

  2. $37^oC$

  3. $47^oC$

  4. $57^oC$

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Correct Option: B
Explanation:

Normal body temperature varies by person, age, activity, and time of day. The average normal body temperature is generally accepted as $98.6°F (37°C)$.

What does the bulb of a clinical thermometer contain?

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

  1. Water

  2. Mercury

  3. Iron

  4. Zinc

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Correct Option: B
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.

Suppose in a clinical thermometer, the difference between first and second bigger marks is $1^o$ and there are 5 small divisions between them then each small division refers to the difference in scale of:

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

  1. $0.1^oC$

  2. $0.2^oC$

  3. $0.3^oC$

  4. $0.4^oC$

Show answer
Correct Option: B
Explanation:

Suppose in a clinical thermometer, the difference between first and second bigger marks is 1o and there are 5 small divisions .
the bigger marks read one degree and there are five divisions between them. Then, one small division can read $\dfrac{1}{5} =  0.2 ^oC$