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37.

The practical limit of moisture content achieved in air drying of timber is                        
A. 5% B. 15%
C. 25% D. 35%



38.

First class timber has an average life of                        
A. less than one year B. 1 to 5 years
C. 5 to 10 years D. more than 10 years



39.

A first class brick when immersed in cold water for 24 hours should not absorb water more than                        
A. 15% B. 20%
C. 22% D. 25%




40.

Crushing strength of a first class brick should not be less than                        
A. 3.5 N/mm2 B. 7.0 N/mm2
C. 10.5 N/mm2 D. 14.0 N/mm2



41.

The main function of alumina in brick earth is                        
A. to impart plasticity B. to make the brick durable
C. to prevent shrinkage D. to make the brick impermeable



42.

The percentage of alumina in a good brick earth lies between                        
A. 5 to 10% B. 20 to 30%
C. 50 to 60% D. 70 to 80%



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