Explain each of the following terms as used in Electronics.

(a) free electrons;

(b) holes.

Tourists with no fixed address in a town may receive their letters from the post office through a

• A. recorded delivery
• B. poste restante
• C. parcel post
• D. postmaster

The thin layer of unconsolidated mineral particles and organic matter covers land surface is called

• A. soil
• B. sialic rock
• C. earth's crust
• D. biosphere

The areas of population concentration is S.E Asia are also areas of?

• A. intensive subsistence farming
• B. advanced industrial development
• C. high urban/rural population ratios
• D. low man/land ratios

An open pipe closed at one end produces its first fundamental note. If the velocity of sound in air is P and t the length of the pipe, the frequency of the note is

• A. 2v/t
• B. v/5t
• C. v/4t
• D. v/2t

The sequence of events that best describes the formation of sandstone is?

• A. dissolution, denudation and consolidation
• B. extrusion, denudation and deposition
• C. intrusion, granulation and consolidation
• D. deposition, consolidation and cementation

The function of zinc electrode in a galvanic cells is that it

• A) undergoes reduction
• B) serves as the positive electrode
• C) production electons
• D) uses up electrons

Detailed survey for the site of a fish pond is necessary for the following except

• A. location and depth of the spillway
• B. determination of the depth of the pond
• C. site inspection
• D. height of the dam

The ice and steam point on a mercury-in-glass thermometer are 10cm and 30cm respectively. Calculate the temperature in decree Celsius when the mercury meniscus is the 14cm mark

• A. 20^oC
• B. 30^oC
• C. 34^oC
• D. 70^oC

From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences:

She does not remember ever..........a tiger

• A. to see
• B. to have seen
• C. seeing
• D. having to see