Q: 39 (NDA-I/2011)


Which of the statements about glass are correct ?
1. Glass is a super-cooled liquid having infinite viscosity
2. Violet coloured glass is obtained by adding Mn02
3. Glass is a man made silicate
4. Glass is a crystalline substance
Select the correct answer using the code given below :
question_subject: 
Science
question_year: 
2011
question_exam: 
NDA-I
stats: 
0,112,168,96,32,112,40