TNPSC Solved Question Papers Part 3 Group 1, 2 ,3 ,4 Solved Questions
21. Mercury is used in
thermometers because it
A. is heavy
B. is a liquid
C. expands uniformly
D. is a metal
22. Sodium chloride is the scientific
name of
A. common salt C. rust
B. soft coke D. chalk
23. Fresh foods and fruits contain
more of
A. proteins C. vitamins
B. fats D. carbohydrates
24. Electric bulbs are filled with
the gas
A. oxygen
B. carbon dioxide
C. argon
D. nitrogen
25. The sides of a match box
A. red phosphorus
B. white phosphorus
C. phosphorus pentoxide
D. none of these
26. Penicillin was discovered by
A. Edward Jenner
B. J.C. Bose
C. Alexander Fleming
D. William Harvey
27. The acid which etches glass is
A. nitric acid
B. sulphuric acid
C. hydrofluoric acid
D. hypochlorous acid
28. Which of the following diseases
is likely to spread in the entire
community if a leaky septic tank
contaminates the water supply?
A. Cholera C. Tuberculosis
B. Cancer D. Leprosy
29. Yeast help in the production of
A. oxygen C. alcohol
B. glucose D. salts
30. Many pulses are obtained from
plants of the family
A. Euphorbiaceae
B. Fabaceae
C. Asteraceae
D. Musaceae