any one can give a clue for cronbakh alpha score and its interpretation.
A very clear chapter is:
Thompson, B. (2002). Understanding reliability and coefficience alpha, really, In B. Thompson (Ed.), Score reliability: Contemporary thinking on reliability issues (pp. 3-23). Newbury park, CA: Sage.
The whole book is good. Part of the argument Bruce Thompson makes here (and elsewhere) is that alpha is often used because that is what everybody uses when they have a scale, but that it often is not reporting what they think it does. The linked paper discusses some questions that I received in relation to alpha and related measures for binary test questions.
Article A dialogue about MCQs, reliability, and item response modelling
I would strongly recommend the following book, which gives a very clear and readable introduction to the area.
Rust, J., & Golombok, S. (2004). Modern Psychometrics (2nd ed.). New York: Routledge.
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