1. Silver gets
corroded due to Hydrogen Sulphide in air.
2. Which of the
following is a radioactive element –Uranium
3. Which of the
digestive organs contains acid –Stomach
4. Which of the
following fibres is considered as the strongest natural fibre- Ultrastrong spider
silk is one of the
toughest natural fibers known in nature. The light, flexible fiber is five
times
stronger by weight than high-grade steel and extremely stretchy, enlarging to snag
incoming insects and other prey.
5. Purpose of an optical filter is to -transmit
or absorb light of different colours
6. Ozone saves the biosphere by absorbing high energy radiations
called - Ultraviolet rays (UV)
7. In the absence of the earth's atmosphere, sky would appear- black
8. Silica gel is a - drying agent
9. Biofertilizers convert nitrogen to -ammonia
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