Heat Transfer
What are the different types of heat transfer?
A. conduction, convection, radiation
B. conduction, radiation, transmission
C. convection, radiation, sublimation
D. convection, evaporation, transmission
A. conduction, convection, radiation
Convection plays a significant role in nature. What convection current is caused by the uneven heating of the sea and land?
A. clouds C. Snow
B. rain D. wind
D. wind
When you put a pan on a heated stove, conduction happens. How does this occur?
A. The heat from the stove transfers to the pan's surface, which helps you cook your food.
B. The heat from the stove transfers to the food through a current of heat.
C. The heat from the stove radiates to the food you are cooking.
D. The heat from the stove moves as a flowing energy.
A. The heat from the stove transfers to the pan's surface, which helps you cook your food.
A. To allow the metal tracks to expand when they become hot.
B. To make the tracks easier to remove
C. To help trains turn more easily
D. To make trains move faster
A. To allow the metal tracks to expand when they become hot.
48. Which of the following is an/a example of radiation?
A. ultraviolet light from the sun.
B. heat from a stove burner.
C. visible light from a candle.
D. All of the above
D. All of the above
What is used by primary sources of energy to convert to the secondary energy source such as electricity?
A. boiler C. motor
B. generator D. turbine
B. generator
Which of the following is an example of heat transfer by conduction?
A. The sun warming the Earth's surface
B. Touching a hot pan on the stove
C. Warm air rising in a room
D. Water boiling in a pot
B. Touching a hot pan on the stove
Which new fabrication technique developed by National Institute of Standards and Technology involves depositing hundreds of thousands of microscopic columns of gallium nitride atop a silicon wafer where interaction converts heat to electrical current?
A. use of nanopillars
B. compact integrated circuit
C. solar semi-conductors
D. electric compressors
A. use of nanopillars
Boiling water transfers heat energy by the current brought about by the changes in its density. In what order of event does this happen?
I. The cold water is pushed down.
II. The layer of water at the bottom gets heated.
III. The hot layer of water expands and becomes less dense and rises.
A. I, II, III C. II, III, I
B. II, I, III D. I. III. II
C. II, III, I
The following are innovative devices that converts heat energy to electrical energy. Which is NOT an example of this?
A. Thermophotovoltaic systems
B. Nanotechnology innovation
C. Thermoelectric generators
D. Solar lights
D. Solar lights