Tag: introduction to temperature

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

People boil water as safe measure to drink because:

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

The most commonly used thermometric substance is

  1. water

  2. alcohol

  3. mercury

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

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

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

  1. True

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

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

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 $0.000018/^oC$.

  1. $60.5\ cm$

  2. $69.5\ cm$

  3. $20.5\ cm$

  4. $50.00\ cm$
Reveal answer Fill a bubble to check yourself
B Correct answer
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 :-
$Lo=\dfrac{70(1+\alpha _2\Delta T)}{(L+\alpha _2\Delta T)}=\dfrac{70(1+1.8\times Lo^{-5}\times 40)}{(1+1.8\times 10^{-4}\times40)}$
$Lo=69.55\ cm$

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

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

  1. $30^{o}C$

  2. $39^{o}C$

  3. $49.5^{o}C$

  4. $29.6^{o}C$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using the linear relationship for a constant volume gas thermometer, T = ((P - P0) / (P100 - P0)) * 100. Substituting values: ((32.45 - 27.50) / (37.50 - 27.50)) * 100 = (4.95 / 10) * 100 = 49.5 C.

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

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 . $

  1. 74.72 cm

  2. 79.92 cm

  3. 74.12 cm

  4. 72.64 cm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The brass scale expands at 15°C, making divisions larger. Apparent reading is smaller. Brass scale factor = 1 + 20×10^-6 × 15 = 1.0003. True height = 74.9 × 1.0003 = 74.8778 cm. Correcting for mercury contraction from 15°C to 0°C: final height = 74.8778 / (1 + 175×10^-6 × 15) = 74.8778 / 1.0026 = 74.72 cm.

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

Mercury thermometers can be used to measure temperatures upto:

  1. $100^{o}C$

  2. $212^{o}C$

  3. $360^{o}C$

  4. $500^{o}C$
Reveal answer Fill a bubble to check yourself
C Correct answer
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.