Q: A 2 m long steel bar expands by 0.24 cm when heated from 20°C to 120°C. What is the linear expansion coefficient $$\alpha$$? (Use $$\Delta L = \alpha L_0$ \Delta T)$$

$$\alpha = 1.2 \times 10$$^{-5}$$ \, \text{K}^{-1}$$

Q: A wall is made of two layers: brick ($$R_1) $$and insulation ($$R_2). $$What is the total thermal resistance?

$$R_{\text{total}} = R_1$ + R_2$

Question 1

Which statement best describes the Zeroth Law of Thermodynamics?

Accepted Answer

If two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other.

Question 2

A metal rod is heated at one end. Which equation best describes the rate of heat conduction through the rod?

Accepted Answer

$$Q = \frac{kA\Delta T}{L}$$

Question 3

A 2 m long steel bar expands by 0.24 cm when heated from 20°C to 120°C. What is the linear expansion coefficient $$\alpha$$? (Use $$\Delta L = \alpha L_0$ \Delta T)$$

Accepted Answer

$$\alpha = 1.2 	imes 10$$^{-5}$$ \, 	ext{K}^{-1}$$

Question 4

Which of the following best explains why metals feel colder than wood at the same temperature?

Accepted Answer

Metals have higher thermal conductivity, so they transfer heat away from your skin faster.

Question 5

A 100 g block of ice at 0°C is placed in 200 g of water at 30°C. What is the final temperature after equilibrium, assuming no heat loss to the environment? (Latent heat of fusion $$L_f = 334 	ext{ J/g}$$, specific heat of water $$c = 4.18 	ext{ J/g} \cdot 	ext{K})$$

Accepted Answer

0°C

Question 6

Which equation correctly relates pressure, force, and area?

Accepted Answer

$$P = \frac{F}{A}$$

Question 7

A copper wire is stretched by a force. Which formula gives the stress in the wire?

Accepted Answer

$$\sigma = \frac{F}{A}$$

Question 8

Which of the following statements about specific heat is correct?

Accepted Answer

Materials with higher specific heat require more energy to change temperature.

Question 9

A wall is made of two layers: brick ($$R_1) $$and insulation ($$R_2). $$What is the total thermal resistance?

Accepted Answer

$$R_{	ext{total}} = R_1$ + R_2$

Question 10

During a phase change, such as melting, which equation is used to calculate the heat required?

Accepted Answer

$$Q = mL$$

Question 11

A heating curve for water shows a flat segment at 100°C. What does this segment represent?

Accepted Answer

Phase change from liquid to gas (boiling)

Question 12

Which of the following is NOT a direct consequence of the conservation of energy principle?

Accepted Answer

Heat can spontaneously flow from cold to hot objects.

Question 13

A composite material is made of two different metals. Which property is most likely to differ between the metals?

Accepted Answer

Internal stress (elastic modulus)

Question 14

Which of the following best describes the Kelvin temperature scale?

Accepted Answer

Absolute temperature scale starting at absolute zero

Question 15

A rod with thermal conductivity $$k$$ and cross-sectional area $$A$$ has a temperature difference $$\Delta T$$ across length $$L. $$What is the heat current $$Q$$?

Accepted Answer

$$Q = \frac{kA\Delta T}{L}$$

Question 16

Which process involves energy transfer without the movement of matter?

Accepted Answer

Conduction

Question 17

A gas is heated at constant pressure. Which equation gives the volume expansion?

Accepted Answer

$$\Delta V = \beta V_0$ \Delta T$$

Question 18

Which of the following is a microscopic reason for higher specific heat in water compared to metals?

Accepted Answer

Water molecules have more degrees of freedom for energy storage.

Question 19

A calibrated thermometer disagrees with another at intermediate temperatures. What is the most likely reason?

Accepted Answer

Different calibration points or nonlinearity in the thermometer's response.

Question 20

Which of the following best describes the relationship between heat, temperature, and phase change?

Accepted Answer

During a phase change, temperature remains constant while heat is absorbed or released.

Temperature, Thermometry, and Heat Transfer: Study Notes

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