2.  "Suniti Choudhary and Bina Das"

3.  "Bina Das and Kalpana Datta"

4.  "Kalpana Datta and Shanti Ghosh"

2.  "July 1935"

3.  "July 1936"

4.  "July 1938"

1.  "Rig Veda"

2.  "Bhagavad Gita"

4.  "Matsyapurana"

1.  "M. K. Gandhi"

2.  "Madan Mohan Malviya"

4.  "B.R.Ambedkar"

1.  "C. Ranjarajan"

2.  "Montek Singh Ahluwalia"

4.  "Kaushik Basu"

1.  "Gill"

2.  "Book lung"

4.  "Pulmonary Sac"

1.  "reflecting radio waves and makes radio communication possible"

3.  "regulating the temperature of atmosphere"

4.  "absorbing cosmic ray particles"

1.  "Bangkok "

2.  "Geneva"

4.  "Baghdad"

1.  "20th November"

3.  " 24th November"

4.  "31st October"

1.  "between 20 hertz and 1000 hertz"

2.  "between 1000 hertz and 20000 hertz"

3.  "less than 20 hertz"