Flashcard or flash card is a set of cards
bearing information, as words or numbers, on either
or both sides, used in classroom drills or in private
study. One writes a question on a card and an
answer overleaf. Flashcards can bear vocabulary,
historical dates, formulas or any subject matter that
can be learned via a question and answer format.
Flashcards are widely used as a learning drill to
aid memorization by way of spaced repetition.
Manila paper is a relatively inexpensive type
of paper, generally made through a less refined
process than other types of paper. It is typically
made from semi-bleached wood fibres. It is not as
strong as kraft paper but has better printing
It is usually used in reporting .
Blackboard or chalkboard is a
reusablewriting surface on which text or drawings
are made with sticks of calcium sulphate orcalcium
carbonate, known, when used for this purpose,
as chalk. Blackboards were originally made of
smooth, thin sheets of black or dark
grey slate stone. Modern versions are often green
because the color is considered easier on the eyes.
A projection screen is an installation consisting of
a surface and a support structure used for
displaying a projected image for the view of an
Uniformly white or grey screens are used almost
exclusively as to avoid any discoloration to the
image, while the most desired brightness of the
screen depends on a number of variables, such as
the ambient light level and the luminous power of
the image source.
Different markets exist for screens targeted for use
with digital projectors, movie projectors, overhead
projectors and slide projectors, although the basic
idea for each of them is very much the same.