Ques No.1: Polio is a _________.
Ans: viral disease
Ques No.2: In a normal healthy body, the number of red cells or erythrocytes in _________.
Ans: each cubic millimetre of blood is 5.0 m
Ques No.3: Heavy water consists of ___________.
Ans: Oxygen and heavy hydrogen
Ques No.4: The elements which emit radiations have atomic number greater than _____.
Ques No.5: The minimum velocity required to escape from the gravitational pull is _________.
Ans: 11.2 km/s
Ques No.6: The satellites which revolve in such an orbit, so that they move with earth rotation are called ___________.
Ans: Geo-stationary satellites
Ques No.7: ________ is a device that converts Mechanical energy into electrical energy.
Ques No.8: _________ are the fine strands of Glass.
Ans: Optical fibres
Ques No.9: One horse power is equal to __________.
Ans: 746 watts
Ques No.10: Ordinary light spreads in all __________.