Class 12 chemistry handouts - prem dhawan sir (D.P.S r.k.puram's best chem teacher)Full description
sterilization of water using bleaching powder
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Sterilization of water by using bleaching powder. A Chemistry investigatory project for class 12.Full description
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Gold Pre-First Unit 12 Test VOCABULARY 1
Choose the option (A, B, C or D) that best completes the sentences.
1
Scientists have recently _____ an interesting discovery. A taken
2
B sequence
C theory
D process
B up with
C out of
D into
B telling
C going
D working
B recorded
C developed
D conducted
Have you come _____ anything interesting in your research? research? A up to
8
D conducted
Have you _____ all the results from the experiments? experiments? A reached
7
C proved
She’s She’s always _____ on about her job. I find it very boring at times. A talking
6
B reached
Scientists Scientist s have come _____ new ways to save energy. A over
5
D made
The _____ of discovering new medicines takes a very long time. A record
4
C analysed
The research scientists haven’t _____ any conclusions conc lusions yet. A done
3
B developed
B out with
C across
D over
I’m afraid the new contract has fallen ______. fallen ______. We’ll We’ll have to find another another one or we’ll we’ll in trouble. A over
B out
C down
D through
/8
2
Use the word given at the end of some of the lines to form a word that fits in the gap in the same line.
Ivan has always wanted to be a (1) __________. He was was very good good at
SCIENCE
science at school, especially (2) __________, where where he was top top of the class. class.
CHEMIST
However, now he is one of the world’s leading (3) __________. He has
METEOROLOGY
always been interested in all things (4) __________ and has set up an
ECOLOGY
organisation to protect natural forests across the country. He has established a special (5) __________ garden garden where rare rare trees are planted and protected protected
BOTANY
in order to preserve species species which are dying out due to human activity.