Chemistry
Write "True" of "False" against the following statements and correct the false ones.
(a) Chemistry plays an important role in our national economy. ……………
(b) Antibiotics are used as preservatives. ……………
(c) D.D.T. is an important fertiliser. ……………
(d) Gunpowder is an insecticide. ……………
(e) Enzymes secreted by our body are chemicals. ……………
Related Questions
The chemicals prescribed by a doctor in treatment of infectious diseases are called:
- antigens
- preservatives
- antibiotics
- fertilisers
(a) …………… deals with the study of matter and the changes it undergoes.
(b) …………… help to increase the production of food.
(c) Food items like jams and pickles are protected by using ……………
(d) L.P.G. is used for ……………
(e) Inert gases were discovered by ……………
Match the following words in column A with those in column B :
Column A Column B (a) Clothing (i) toothpaste,
cosmetic(b) Green revolution (ii) nylon,
wool(c) Building materials (iii) agriculture (d) Commodities of
daily use(iv) mortar, cement Match the following scientists in column A with their discoveries or contribution in column B :
Column A Column B (a) Marie Curie (i) Safety lamp (b) John Dalton (ii) Helium (c) William Ramsey (iii) Nobel prize winner
(two times)(d) Sir Humphry davy (iv) Atomic theory