SSC Chemistry Previous year questions Set 3

21. The radio-active element used in heart pacemakers is – [SSC Section Officer (Audit) 2001]
A. Uranium
B. Deuterium
C. Plutonium
D. Radium

Answer –A.Uranium

22. Which among the following elements is found in maximum percentage in the human body ?[SSC Section Officer (Audit) 2003]
A. Carbon
B. Hydrogen
C. Nitrozen
D. Oxyzen

Answer –D. Oxyzen

23. Commercial nitric acid is coloured because it contains dissolved : [SSC CGL Prelims 2000]
A. Oxygen
B. Nitrous oxide
C. Nitrogen dioxide
D. Coloured impurities

Answer –C. Nitrogen dioxide

24. Which of the following is ozone depleting pesticide ?[SSC CPO Sub-Inspector 2004]
A. D.D.T.
B. Benzene
C. Methyl bromide
D. Ethylene ozonide

Answer –C. Methyl bromide

25. What is the name of that system, which uses radioactivity to decide the period of materials of-pre-historic period ? [SSC Section Officer (Audit) year 1997]
A. Radium dating
B. Uranium dating
C. Carbon dating
D. Deuterium dating

Answer –C. Carbon dating

26. The most suitable vessel for storing concentrated sulphuric acid is_ [SSC Tax Assistant (Income Tax & Central Excise 2004]
A. Copper vessel
B. Aluminium vessel
C. Glass vessel
D. Earthen vessel

Answer –C. Glass vessel

27. Which among the following coal contains 90 per cent of carbon? [SSC Section Officer (Audit) 2003]
A. Anthracite
B. Bitumen
C. Lignite
D. Peat

Answer –A. Anthracite

28. Milk is a colloidal system in which: – [SSC CGL Prelim 2002]
A. Water is dispersed in fat
B. Fat is dispersed in water
C. Fat and water are dispersed in each other
D. Fat is dissolved

Answer –B. Fat is dispersed in water

29. Where does the oxygen that keeps us alive come from? [SSC CGL Prelim 2000]
A. Carbon dioxide
B. Carbonates absorbed from soil
C. Oxides of minerals
D. Water

Answer –D. Water

30. The long range potential of nuclear energy in India depends on its reserves of ___ [SSC Tax Assistant (Income Tax & Central Excise) 2004]
A. thorium
B. uranium
C. plutonium
D. radium

Answer –B. Uranium

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