5. Room temperature on the Kelvin scale is abourt... a. 100 K b. 200 K c. 300 K

Question

5. Room temperature on the Kelvin scale is abourt... a. 100 K b. 200 K c. 300 K d. 400 K 6. Three rectangular blocks (similar dimensions, different materials, different thermal conductivity) are placed with one end in a fire. Soon after, you're asked to touch the other end of a block; which would you choose? a. Old dry wood b. Steel c. Concrete d. No difference between them 7. The First Law of Thermodynamics... a. defines temperature b. is based on conservation of energy c. applies only for the human body d. gives the efficiency of a system 8. As a fluid flows into a constriction in a pipe, the velocity... a. increases b. stays the same c. decreases d. is independent of the area change of the constriction 9. Which of the following statements is false? 1. A viscous fluid resists flowing 2. Doubling the diameter of a pipe doubles the flow rate 3. Poiseuille's Law gives the volume flow rate for a viscous fluid in a pipe 4. Flows tend to become turbulent at higher speeds 10. Which temperature is smallest? a. -20 °F b. 10°F c.-100°C d.-200°C

Explanation / Answer

5.) room temperature in kelvin is 300k

6.) we choose old dry wood because dry wood is bad conductor of heat.

7.) first law of thermodynamic is based on conservation of energy. dQ = U + dW

8.) As the area of constriction is less than pipe area.. hence velocity will increase ... V1A1 = V2A2

9.) STATEMENT 2 is false.. on doubling the diameter of pipe, doubling the cross section area of pipe so flow rate will decreases by 1/4 factor.

10.) -20*F = -2888889 *C

       -10*F= -23.333333 *C

       0K = -273.15 *C

hence 0 k is lowest temperature.

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