heat & temp

Open Ended

ID

NIM

Multiple Choice

What is the relationship between temperature and heat?

• Temperature is the same as heat

• Heat is a measure of temperature

• Temperature measures the average kinetic energy of particles

• Heat is the total energy of all particles in a substance

Multiple Choice

What is the definition of temperature and heat?

• Temperature is a measure of heat energy.

• Heat is the energy transferred between objects.

• Temperature is the average kinetic energy of particles.

• Heat is the total energy of all particles in an object.

Multiple Choice

What is the relationship between heat and temperature?

• Heat is the same as temperature

• Temperature measures the energy of an object

• Heat is a measure of how cold an object is

• Temperature is not related to heat

Multiple Choice

Which direction is heat flowing in the picture?

• from the hand to the ice
• from the ice to the hand
• heat is not being transferred
• there is no way to tell

Multiple Choice

Heat always travels from...

• Warm to cool

• Cool to warm

• Warm to warm

• Cool to cool

Multiple Choice

What are the types of scales used in thermometers?

• Linear Scale

• Logarithmic Scale

• Celsius Scale

• Fahrenheit Scale

Multiple Choice

What are the boiling and freezing points of water in Celsius, Fahrenheit, Rankine, and Kelvin?

• Boiling point: 100°C, Freezing point: 0°C

• Boiling point: 212°F, Freezing point: 32°F

• Boiling point: 373 K, Freezing point: 273 K

• All of the above

Multiple Choice

Which temperature scale has no negative temperatures?

• Celsius
• Fahrenheit 
• Joule
• Kelvin

Multiple Choice

How do you convert degrees C to K?

• Add 273
• Subract 273
• call 911

Multiple Choice

Convert: 253 C to K:

• 526 K
• 625 K
• 0 K
• 186 K

Multiple Choice

What is 45 K in Celsius?

• -318

• 228

• 318

• 45

Multiple Choice

What is the formula to convert temperature from thermometer y to thermometer x?

• t°x = [Comparison x / Comparison y] * (t°y - freezing point y) + freezing point x

• t°x = [Comparison y / Comparison x] * (t°y - boiling point y) + boiling point x

• t°x = (t°y - freezing point y) + freezing point x

• t°x = (t°y - boiling point y) + boiling point x

Multiple Choice

A liquid measured at 77°F. What is the temperature in °C?

• 25°C

• 20°C

• 30°C

• 15°C

Multiple Choice

Scientists' favorite temperature scale, because it begins at the absolute coldest anything can get. 

• Celsius
• Fahrenheit
• Kelvin
• All of them

Multiple Choice

Device/Object that measures temperature. 

• Thermal energy
• Temperature
• Thermometer
• Heat

Multiple Choice

Convert

$$100^oC$$  to Kelvin

• $$373\ K$$  

• $$273\ K$$  

• $$212\ K$$  

• $$0\ K$$  

Multiple Choice

Heat is defined as

• the transfer of thermal energy from one object to another due to temperature difference

• the temperature of a solid, liquid, or gas

• The kinetic energy of a solid, liquid, or gas.

Multiple Choice

There are four cups of hot cocoa. The cup sizes are shown. The temperature of the cocoa in each cup is 25 degrees celsius. Which cup has the MOST thermal energy?

• Large cup (Trenta)
• Small cup (Tall)
• Venti
• All three are the same temperature so they have same thermal energy

Multiple Choice

Thermal energy always moves:

• From a high temperature object to a lower temperature object.
• From a lower temperature object to a higher temperature object.
• From an object with lower kinetic energy to an object with higher kinetic energy.
• From an object of higher mass to an object of lower mass.

Multiple Choice

Consider the following temperature-time graph when a solid is heated. which part of the graph involves latent heat of vaporization?

• Part I

• Part II

• Part III

• Part IV

Multiple Choice

The graph shows the cooling curve of a substance.
The specific latent heat released at stages?

• CD and FG
• DE and EF
• EF and FG
• DE and FG

Multiple Choice

How do you calculate heat lost or gained?

• m x change in Temperature x specific heat

• mass/ change in temperature

• mass x change in temperature/ specific heat

• mass x change in temperature

Multiple Choice

A block of ice weighing 100 grams at 0ºC is mixed with 200 grams of water at 70ºC. If the ice completely melts, what will be the final temperature of the mixture?

• 10ºC

• 20ºC

• 30ºC

• 40ºC

Open Ended

Sebuah gelas berisi air dingin dengan massa 200 gram pada suhu 20oC dicampurkan dengan air panas bermassa 100 gram pada 80oC. Jika gelas dianggap tidak menerima kalor berapakah suhu campuran dari air panas dan air dingin tersebut?

200 g cold water at 20°C + 100 g hot water at 80°C → Find final mixture temperature.

Multiple Choice

What is the final temperature when hot water (5 g at 90°C) is mixed with cold water (2.5 g at 10°C)?

• 60.0 °C

• 63.3 °C

• 70.0 °C

• 75.0 °C

Multiple Choice

You are doing your homework at a desk that is underneath a lamp. You start to feel hotter because of _?_ from the lamp.

• conduction

• convection

• radiation

Multiple Choice

Stir frying vegetables is an example of

• Convection

• Conduction

• Radiation

Open Ended

A metal rod is heated.

Using this gif, explain how thermal is transferred from the flame to the far end of the rod.

Multiple Choice

What is Fourier's Law of heat conduction?

• q = kA(T1 - T2)/Δx

• q = kA(dT/dx)

• q = kA(T2 - T1)/Δx

• q = kA(T1 + T2)/Δx

Multiple Choice

True or False: Conduction is the direct transfer of heat energy from high temperature to low temperature substances.

• True
• False

Multiple Choice

Walking on the warm sand sand with your bare feet demonstrates this type of heat transfer. 

• conduction
• convection
• radiation

Multiple Choice

Johnny accidentally grabbed the handle of the hot pot.

• conduction
• convection
• radiation

Multiple Choice

The man goes to take the hot pot off the stove with his bare hands.

• conduction
• convection
• radiation

Multiple Choice

A wall has a thickness of 25 cm and a thermal conductivity of 0.69 W/m°C, maintained at 20°C on one surface and 10°C on the other. Determine the rate of heat flow when it passes through an area of 5 m². Heat flow through a 25 cm wall (k = 0.69 W/m°C), temperatures 20°C and 10°C, area 5 m².

• 0.5 W

• 1.0 W

• 1.5 W

• 2.0 W

Multiple Choice

Log A and B have the same length and cross-sectional area. The thermal conductivity coefficient of log A is 1/6 times that of log B. Both logs are heated at one end and it turns out that both experience the same temperature change. Determine the comparison of heat transfer rates of logs A and B! Compare heat transfer rates of metals A and B (k_A = 1/G k_B).

• A transfers more heat

• B transfers more heat

• Both transfer the same heat

• Cannot be determined

Open Ended

Dua zat padat P dan Q yang mempunyai ukuran yang sama tetapi jenisnya berbeda dilekatkan seperti pada gambar di bawah. Apabila koefisien konduksi termal P adalah tiga kali koefisien konduksi termal Q, maka tentukan suhu pada bidang batas P dan Q!

Two solids P and Q attached; k_P = 3 k_Q → Find boundary temperature.

Multiple Choice

Warm air rises and the cool air sinks demonstrates this type of heat transfer. 

• conduction
• convection
• radiation
• Insolation 

Open Ended

Laju aliran panas dari lempengan (plat) metal adalah 1000 W/m2. Suhu permukaan plat tersebut adalah 120 ᵒC dan lingkungan adalah 20 ᵒC. Tentukan koefisien pindah panasnya! A metal plate loses 1000 W/m².

Surface temp = 120°C; ambient temp = 20°C → Find h.

Multiple Choice

A group of friends gather around a fire to stay warm.

• conduction
• convection
• radiation

Open Ended

Sebuah benda dengan luas permukaan 100 cm2 bersuhu 727oC. Jika koefisien Stefan-Boltzman 5,67 x 10−8 W/mK4 dan emisivitas benda adalah 0,6 tentukan laju rata-rata energi radiasi benda tersebut!

A surface (100 cm²) at 727°C; emissivity = 0.6 → Find radiated power.

Open Ended

Daya radiasi yang dipancarkan suatu benda pada suhu 227oC adalah 1200 J/s. Jika suhu benda naik hingga menjadi 727oC, tentukan daya radiasi yang dipancarkan sekarang! Object radiates 1200 J/s at 227°C.

What is radiated power at 727°C?

Poll

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