Ques No.1: _________ is A telecommunication link between the rulers of countries.
Ques No.2: Sparkling red colour after the blast of fire cracker is due to the presence of _______.
Ques No.3: Bat has the highest upper limit of ___________.
Ans: audible range
Ques No.4: The process of elimination of water from any system is called _________.
Ques No.5: An iceberg is floating in sea. _________ of its mass will remain above the surface of water.
Ans: One tenth
Ques No.6: _________ is commonly used in balloons and airships.
Ans: Helium gas
Ques No.7: The Sun remains visible for some time after it actually sets below the horizon. This happens due to ___________.
Ans: Atmospheric Refraction
Ques No.8: Radioactivity was first discovered by _________.
Ans: Henry Becquerel
Ques No.9: A lake starts freezing because of the cold atmosphere. It will first __________.
Ans: freeze at the top surface
Ques No.10: ________ is present in the largest amount in terms of per cent by mass in the earth‘s crust.