Tag: application of various thermometric scales

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Multiple choice physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

Two thermometers are constructed in the same way except that one has a spherical bulb and the other a cylindrical bulb; which one will respond quickly to temperature changes?

  1. Spherical bulb thermometer

  2. Cylindrical bulb thermometer

  3. both equally

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

A spherical bulb has a smaller surface-area-to-volume ratio than a cylindrical bulb of similar volume, but a cylindrical bulb is often designed to have a larger surface area for faster heat exchange. However, the spherical shape is generally more robust, while the cylindrical shape responds faster due to higher surface area exposure.

Multiple choice physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

At the top of a mountain, a thermometer read ${7}^{0}C$ and barometer reads $70\, cm$ of Hg. At the bottom of the mountain, the barometer reads $76\,cm$ of Hg and thermometer reads ${27}^{0}C$. The density the density at the bottom.

  1. $0.99$

  2. $0.9$

  3. $0.89$

  4. $0.95$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the ideal gas law P = rho * R * T. The ratio of densities rho1/rho2 = (P1/T1) / (P2/T2). P1=70, T1=280K; P2=76, T2=300K. rho1/rho2 = (70/280) / (76/300) = 0.25 / 0.2533 = 0.986, which is approximately 0.99.

Multiple choice physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

A thermometer reads $0^{\circ}$ as $10^{\circ}$ and $100^{\circ}$ as $90^{\circ}C$. Then
Find the reading of the temperature if the temperature is $40^{\circ}C$?

  1. $42^{\circ}C$

  2. $40^{\circ}C$

  3. $35^{\circ}C$

  4. $45^{\circ}C$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The scale is linear: T_new = m * T_c + c. 0 = m(10) + c and 100 = m(90) + c. Solving gives m = 100/80 = 1.25 and c = -12.5. For T_c = 40, T_new = 1.25 * 40 - 12.5 = 50 - 12.5 = 37.5. Wait, checking the math: 0C -> 10, 100C -> 90. Slope = (90-10)/(100-0) = 0.8. T_new = 0.8 * T_c + 10. For T_c = 40, T_new = 0.8 * 40 + 10 = 32 + 10 = 42.

Multiple choice physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

If two temperatures differ by 25 degrees on Celsius scale, the difference of temperature on Fahrenheit scale is 

  1. $65^{\circ}$

  2. $45^{\circ}$

  3. $38^{\circ}$

  4. $25^{\circ}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Each Celsius degree equals 5/9ths of a Fahrenheit degree. 

Each Fahrenheit degree equals 9/5ths of a Celsius degree. 

A 25 degree difference in Celsius would be 25 x 9/5 = 45 degrees Fahrenheit.

Multiple choice physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

A Centigrade and Fahrenheit thermometers are dipped in boiling water. The water temperature is lowered unit the Fahrenheit thermometre registers a temperature of $140^o$. The fall of temperature as registered by the Centigrade thermometre is :

  1. $80^o$C

  2. $40^o$C

  3. $50^o$C

  4. $90^o$C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Boiling point is 100C or 212F. The temperature dropped from 212F to 140F, a change of 72F. The conversion factor is 5/9. Change in C = (5/9) * 72 = 5 * 8 = 40C.

Multiple choice physics temperature and heat application of various thermometric scales different types of thermometers measuring temperature

On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are $39^o$W and $239^o$W respectively. What will be the temperature on the new scale, corresponding to a temperature of $39^o$C on the Celsius scale ?

  1. $78^o$W

  2. $117^o$W

  3. $200^o$W

  4. $139^o$W
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The scale is linear: W = m * C + c. 0C = 39W, 100C = 239W. Slope m = (239-39)/100 = 2. W = 2 * C + 39. For C = 39, W = 2 * 39 + 39 = 78 + 39 = 117.

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.