21. In cold countries alcohol is preferred to mercury as a thermometric liquid because:
alcohol has a lower freezing point
alcohol is a better conductor of heat
alcohol is cheaper than mercury
the world production of alcohol is greater than that of mercury
22. Charcoal which is used in decolouring raw sugar is:
wood charcoal
sugar charcoal
animal charcoal
coconut charcoal
23. With which of the following is the tape of the tape recorder coated?
Copper sulphate
Ferromagnetic powder
Zinc oxide
Mercury
24. These days yellow lamps are frequently used as streetlight. Which one of the following is used in these lamps?
Sodium
Neon
Hydrogen
Nitrogen
25. The age of the tree, in years, can be ascertained by:
its weight
its height
the number of its annual rings
length of its root
26. The gas used in discharge tubes for optical decoration and advertising is:
Carbon dioxide
Ammonia
Sulphur dioxide
Neon
27. Which one of the following is not an explosive?
Trinitrotoluene
Trinitroglycerin
Cyclotrimethylene trinitramine
Nitrochloroform
28. Which one of the following pairs is not correctly matched?
Fullerenes – Organic compounds containing fluorine
Dry ice – Solid carbon dioxide
Keratin – Protein found in the outer layer of human skin
Mustard gas – Poisonous liquid used in chemical warfare
29. Match List–I with List–II and select the correct answer using the codes given below: List–I List–II (Radioisotope) (Diagnostic use) A. Arsenic–74 1. Activity of thyroid gland B. Cobalt–60 2. Blood disorder C. Iodine–131 3. Tumour D. Sodium–24 4. Cancer Codes: A B C D
1 2 3 4
4 3 1 2
3 4 1 2
4 3 2 1
30. The main constituent of honey is
glucose
sucrose
maltose
fructose
31. Which of these is not a colloid?
Milk
Blood
Ice cream
Honey
32. Which one of the following metals is not attracted by a magnet?
Iron
Nickel
Cobalt
Aluminium
33. The important metal used with iron to produce stainless steel is
aluminium
chromium
tin
carbon
34. The essential element in all organic compounds is:
Nitrogen
Oxygen
Carbon
Sulphur
35. Which acid is used in photography?
Formic acid
Oxalic acid
Citric acid
Acetic acid
36. Consider the following statements and select the correct answer from the codes given below: 1. Presence of calcium sulphate makes water hard and unfit for use. 2. Diamond is harder than copper and iron. 3. The main component of air is oxygen. 4. Nitrogen is used in the preparation of vegetable ghee. Codes:
1 and 2
3 and 4
1 and 3
2 and 4
37. Consider the following statements and select the correct answer from the codes given below: 1. Brass is a compound of copper and zinc. 2. Magnetite is the most important ore of aluminium. 3. Amalgam is that substance which basically contains mercury. 4. Potassium nitrate is one of the essential chemicals used in photography. Codes:
1 and 2
1 and 3
2 and 3
1, 3 and 4
38. Which one of the following types of coal contains a higher percentage of carbon than the rest?
Anthracite
Bituminous coal
Lignite
Peat
39. Isotopes are atoms of an element whose:
atomic weight is same, but atomic number is different
atomic weight different, but atomic number same
atomic number and atomic weight are same
None of these
40. The gas which is believed to be the main cause of explosion in the coal mines is:
Acetylene
Carbon monoxide
Hydrogen
Methane
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