Tag: heat - measurement

Questions Related to heat - measurement

The range of a clinical thermometer is

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. 0-100$^0$C

  2. 32-214$^0$F

  3. 0-1273$^0$C

  4. 35-42$^0$C

Show answer
Correct Option: D
Explanation:

A clinical thermometer is used to measure the body temperature which normally remains between $35^{\circ}$C and $42^{\circ}$C.


People boil water as safe measure to drink because:

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. Boiled water is tasty

  2. Boiled water is more powerful

  3. Heating water is fashionable

  4. Excessive heat kills the microorganisms present in the water

Show answer
Correct Option: D
Explanation:

People boil water as safe measure to drink because excessive heating kills the microorganisms present in the water and becomes safe to drink it.

At low temperatures ________  type of thermometer is used.

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. mercury thermometer

  2. water thermometer

  3. alcohol thermometer

  4. thermometers cannot be used

Show answer
Correct Option: C
Explanation:

Alcohol has a low freezing point.

The most commonly used thermometric substance is

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. water

  2. alcohol

  3. mercury

  4. steam

Show answer
Correct Option: C
Explanation:

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. It also has a high boiling point which makes it very suitable to measure higher temperatures, and it doesn't stick to glass.

State whether given statement is True or False
The upper standard point of a thermometer is 273 K

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

The lower fixed point, or ice point, is the temperature of pure melting ice at normal atmospheric pressure. The upper fixed point, or steam point, is the temperature of pure boiling water at normal atmospheric pressure.

A barometer with a brass scale correct at $0^oC$ reads $70\ cm$ of mercury on a day when the air temperature is $40^oC$. the correct reading at $0^oC$ is (Coefficient of real expansion of mercury, is $0.00018/^oC$ and the coefficient of linear expansion of brass is $0.000018/^oC$.

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. $60.5\ cm$

  2. $69.5\ cm$

  3. $20.5\ cm$

  4. $50.00\ cm$

Show answer
Correct Option: B
Explanation:

If the correct heading of barometer at $0^oC$ is $70\ cm$ then the at $40^oC,$ the reading will show,

$L=70(1+\alpha _1\Delta T)$    $[\alpha$ ,of Brass , $\Delta T=40\ k]$
similarly , mercury expands to $70\ cm$ from initial length $Lo$
$\Rightarrow L=Lo(1+\alpha _2\Delta T)$   ($\alpha _2:$ mercury)
It gives :-
$Lo=\dfrac{70(1+\alpha _2\Delta T)}{(L+\alpha _2\Delta T)}=\dfrac{70(1+1.8\times Lo^{-5}\times 40)}{(1+1.8\times 10^{-4}\times40)}$
$Lo=69.55\ cm$

A Fahrenheit thermometer registers $107^{o}F$ while a faulty Celsius thermometer registers $42^{o}C$. Find the error in the later

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. $0.37^{o}$

  2. $0.87^{o}$

  3. $0.67^{o}$

  4. $48$

Show answer
Correct Option: C

The pressure of a gass filled in the bulb of a constant volume gas thermometer at temperatures $0^{o}C$ and $100^{o}C$ are $27.50\ cm$ and $37.50\ cm$ of $Hg$ respectively. At an unknown temperature the pressure is $32.45\ cm$ of $Hg$. Unknown temperature is

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. $30^{o}C$

  2. $39^{o}C$

  3. $49.5^{o}C$

  4. $29.6^{o}C$

Show answer
Correct Option: C

The height of the mercures column in a barometer provided with a bross scale corrected at $ 0^0C $ is obserevd to be 74.9 cm at $ 15^0 C $ . find the true height of the coulmn at $ 0^0 C/ \alpha _b=20 \times 10^{-6} /c^0 \gamma _Hg=175 \times 10^{-6}/c^0 . $

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. 74.72 cm

  2. 79.92 cm

  3. 74.12 cm

  4. 72.64 cm

Show answer
Correct Option: A

Mercury thermometers can be used to measure temperatures upto:

physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

  1. $100^{o}C$

  2. $212^{o}C$

  3. $360^{o}C$

  4. $500^{o}C$

Show answer
Correct Option: C
Explanation:

Mercury thermometer is based on the principle of change of volume with rise of temperature and can measure temperatures ranging from $-{30}^{\circ}$C to ${357}^{\circ}$C.