1686: Which of the following throws light on Harappan Culture?
(a) Archaeological excavations
(b) The script on copper sheets
(c) Rock edicts
(d) All of the above
1687: Which one of the following polymers is widely used for making bullet proof material ?
(a) Polyvinyl chloride
(b) Polyamides
(c) Polyethylene
(d) Polycarbonates
1688: Where is Copacabana Beach located ?
(a) Hawaiian Islands
(b) Valletta
(c) Rio de Janeiro
(d) Buenos Aires
1689: Why the Indian farmers plough their fields during the time interval between two crops?
(a) In order to keep the soil loose for further cultivation
(b) To increase the porosity of the soil
(c) To escape drought
(d) To prevent clodding
1690: Where does exchange of gases (O2 and CO2) take place in our lungs ?
(a) Alveoli
(b) Bronchi
(c) Pleura
(d) Trachea