81: Which one among the following States is smallest in area?
(a) Andhra Pradesh
(b) Gujarat
(c) Karnataka
(d) Tamil Nadu
82: A rectangular water tank measures 15 m x 6 m at top and is 10 m deep. It is full of water. If water is drawn out lowering the level by 1 metre, how much of water has been drawn out ?
(a) 45,000 litres
(b) 90,000 litres
(c) 4,500 litres
(d) 900 litres
83: With reference to the treatment of cancerous tumours, a tool called cyberknife has been making the news. In this context, which one of the following statements is not correct ?
(a) It is a robotic image guided system
(b) It delivers an extremely precise dose of radiation
(c) It has the capability of achieving sub-millimetre accuracy
(d) It can map the spread of tumour in the body
84: Which one of the following techniques can be used to establish the paternity of a child ?
(a) Protein analysis
(b) Chromosome counting
(c) Quantitative analysis of DNA
(d) DNA finger-printing
85: Rainfall on the east coast of Tamil Nadu occurs during October to November due to
(a) Winter monsoon
(b) Retreating south-west monsoon
(c) North-west monsoon
(d) Local winds