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Many theories have been put forward to explain why the blackboard is green. One theory was that the green was chosen to be pleasing on the eyes. Since students need to focus on what is written on the board, manufacturers picked the color green. Tests also proved that other colors such as yellow or orange could strain the eyes if starred for long. Today the blackboard come in different colors. After green, it is Black and White which are popularly used.
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What is white when it's dirty and black it's clean?
A blackboard seems to fit.
What does tableau mean?
Tableaus means blackboard or chalkboard, honey.
What is the size of a classroom blackboard?
primary school large then 3600mm * 1000mm middle school large then 4000mm * 1000mm
Green Giant vegetables has two mascots The Jolly Green Giant and who?
little green sprout
What is operation blackboard?
Operation Blackboard is a centrally sponsored programme which was started in 1987 immediately after the Rajiv Gandhi NPE of 1986 was released to supply the bare minimum crucial facilities to all primary schools in the country. The objective of the scheme is providing students studying in primary settings with the necessary institutional equipment and instructional material to facilitate their education. There is a provision to provide salary for an additional teacher to those primary schools that have an enrolment of more 100 students or for a consecutive period of two years. In the ninth five year plan the scheme was extended to all upper primary schools as well.
What is the two word adjective of blackboard?
green board
What was the inventor of the blackboard like?
The guys name is James Pillans. He invented this piece in 1801 and called it the blackboard. In the 1930s the name "chalkboard" was introduced. The blackboard is mostly for teaching. It has different variaties of colers,such as black,green,and brown.
Why the blackboard called a blackboard if the color of the board is green?
Originally they were made of thin sheets of a type of rock known as slate- which is very dark gray (black) in color. Later they used a man manmade material that was lighter and cheaper, and changed the color to green- better visibility. But we still use the old name.
When was Blackboard Inc. created?
Blackboard Inc. was created in 1997.
What is the population of Blackboard Inc.?
The population of Blackboard Inc. is 1,780.
Why do board called as blackboard even its color is green?
Originally the boards were made of slate which is a black stone. They were eventually replaced by wooden boards painted green but the name still stuck.
What are the advantages and disadvantages of blackboard learning system?
advantages and disadvantages of blackboard
What is the duration of Beyond the Blackboard?
The duration of Beyond the Blackboard is 1.67 hours.
What is the duration of Murder on the Blackboard?
The duration of Murder on the Blackboard is 1.18 hours.
What width of a blackboard?
There is more than one size of blackboard...
When was the blackboard created?
Beyond the Blackboard was created on 2011-04-24.
Why is a blackboard is green?
In recent years, green colored boards have largely replaced blackboards. Studies reveal that green color relaxes the eyes and prevents fatigue. Furthermore, the human eye is highly sensitive to the green color, and for this reason, the use of green boards has extensively increased.
