Tag: temperature and heat

Quizzes (15) Questions (111)

Questions Related to temperature and heat

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 temperature and heat applications of convection convection transfer of heat

A 1200 kg car is braked to a stop from 100 km/h. If 60% of this energy appears in the steel brake drums, whose total mass is 10 kg its temperature will rise by $\left( s _ { \text { steel } } = 450 \mathrm { J } / \mathrm { kg } \mathrm { K } \right)$

  1. $31.2 ^ { \circ } C$

  2. $61.7 ^ { \circ } \mathrm { C }$

  3. $92.1 ^ { \circ } C$

  4. $42.1 ^ { \circ } C$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$\large \begin{array}{l} According\, to\, question............. \ Here, \ \, \, \, \, \, m=1200kg,\, \, \, break\, drum\, (m)=10kg \ \, \, \, \, u=100km/h=27.77m/s \ \, \, \, \, { S _{ Steel } }=450J/KgK,\, \, \, \, \, V=0\, m/s \ so,\,  \ Energy\, released\, during\, breaking=\, \, change\, in\, kinetic\, energy \ \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, =\frac { 1 }{ 2 } m{ v^{ 2 } }-\frac { 1 }{ 2 } m{ u^{ 2 } } \ \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, =\frac { 1 }{ 2 } (1200)\, { (0)^{ 2 } }-\frac { 1 }{ 2 } (1200)\, { (27.77)^{ 2 } } \ \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, =0-462937.0374\, J \ \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, =462937.0374\, J \ Now, \ \, \, 60\quad perecent\quad of\, this\, energy\, appears=0.6\times 462937.0374\, J=277762.225 \ For\, change\, in\, temperature:\, \, \, \, ms\Delta \frac { 1 }{ 2 } t=277762.225 \ \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \Rightarrow \Delta t=\dfrac { { 277762.225 } }{ { ms } } =\dfrac { { 277762.225 } }{ { 10\times 450 } }  \ \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \therefore \, \, \, \, \Delta t\, ={ 61.7^{ 0 } }C \ so\, \, the\, correct\, option\, is\, B. \end{array}$

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

To mark a temperature scale on a thermometer, standard temperatures knows as fixed points are needed.
Which of these is a fixed point on the Celsius scale?

  1. room temperature

  2. the temperature inside a freezer

  3. the temperature of pure melting ice

  4. the temperature of pure warm water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To define the Celsius temperature scale two "reliable" temperatures are used. These are, the melting point of pure ice, which gives us the lower fixed point of the scale and the boiling point of pure water (at atmospheric pressure) which gives us the upper fixed point.

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

A mercury thermometer, with a concave reflector behind the bulb, is placed in front of an electric fire. Which of the following combinations will cause the smallest reading on the thermometer?

  1. Black reflector, black bulb

  2. Black reflector, shiny bulb

  3. Shiny reflector, shiny bulb

  4. Remains same
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A mercury thermometer, with a concave reflector behind the bulb, is placed in front of an electric fire.Black reflector, shiny bulb combinations will cause the smallest reading on the thermometer The black coating absorbs energy and warms up and warms the bulb by conduction.