Questions from chemistry 8-9 class

Multiple Choice Questions. (MCQ) 1) Formalin is generally used as an (a) antiseptic (b) anesthetic (c) stimulant (d) Preservative (Ans. d ) 2) Which of the following acids is contained in the sting of bees and wasps a) formic acid b) acetic acid c) oxalic acid d) hydrochloric acid (Ans. a ) 3) The sour test of curd is due to the presence of a) acetic acid b) lactic acid c) formic acid d) citric acid (Ans. b ) 4) The natural dye present in turmeric is known as a) curcumin. b) cinnamon c) phenolphthalein d) methyl orange (Ans. a ) 5) Which one of the following elements is used in the manufacture of fertilizers a) fluorine b) lead c) potassium d) aluminum (Ans. c ) 6) By what name is acetylsalicylic acid better known a) vinegar b) brine c) saltpeter d) Aspirin (Ans. d ) 7) What is the mixture of potassium nitrate, powdered charcoal and sulphur called a) glass b) cement c) paint d) gun powder (Ans. d ) 8) Which one of the following is extensively used for sterilizing water a) bleaching powder b) alum c) borax powder d) soda powder (Ans. a ) 9) Which one of the following substances evolves heat when dissolved in water a) potassium nitrate b) calcium oxide c) glucose d) sodium chloride (Ans. b ) 10) Which chemical was an important symbol in India’s struggle for freedom a) acetic acid b) ammonium nitrate c) silver iodide d) sodium chloride (Ans. d ) 11) Which one of the following was known as Aqua Fortis in ancient times a) nitric acid b) sulphuric acid c) butyric acid d) hydrochloric acid (Ans. a ) 12) Which of the following elements behave chemically both as a metal and a non metal a) boron b) carbon c) argon d) mercury (Ans. a ) 13) Human bones does not contain a) calcium b) carbon c) oxygen d) phosphorus (Ans. c ) 14) Enzymes are a) fatty acids b) carbohydrates c) nucleic acids d) proteins (Ans. d ) 15) Which of the following gases is the most toxic a) carbon di oxide b) sulphur di oxide c) carbon monoxide d) hydrogen chloride (Ans. c ) 16) Which of the following gases is used in cigarette lighters a) butane b) propane c) methane d) ethane (Ans. a ) 17) Which metal of the following is the softest a) lithium b) sodium c) iron d) Copper (Ans. b ) 18) The inert gas abundantly found in widely distributed is a) Xenon b) krypton c) Helium d) argon (Ans. d ) 19) Which one of the following petroleum refinery products has the lowest boiling point a) kerosene b) gasoline c) diesel d) lubricating oil (Ans. d ) 20) Atomic number is the number equal to a) protons b) electrons c) neutrons d) none of them (Ans. a ) One word answer 21) The chemical symbol of tin is ___________ .( Ans. Sn) 22) The chemical symbol of lead is __________. ( Ans. Pb) 23) The name of the lightest noble gas is _______. (Ans. Helium) 24) The chemical formula of Hydrogen peroxide is ______. ( Ans. H2O2) 25) The colour of Liquid oxygen is ______. ( Ans. Blue) 26) The essential element in all organic compounds is _______. ( Ans. Carbon) 27) The element present in the largest amount in rocks and minerals is ________. (Ans. Silicon) 28) Non-stick cooking utensils are coated with _______. (Ans. Teflon) 29) The main constituent of natural gas is ________. (Ans. Methane) 30) Iron is ______ reactive than copper. (Ans. more) 31) Metals react with acids to produce ________. (Ans. hydrogen) 32) For a gas, at constant temperature, pressure and volume are ________ proportional. (Ans. inversely) 33) Molecules of a ________ move in straight lines, undergo random collision with other molecules and occupy the complete space available. (Ans. gas) 34) Atomicity of ozone molecule is _____. (Ans. 3) 35) The maximum amount of solute which can get dissolved in one litre of solution at a definite temperature is called _________. (Ans. solubility) True/False 36) The substances which vaporize during burning give flame and don’t vaporize during burning, don’t give flame. (Ans. T) 37) Rapid combustion is such type of combustion in which materials suddenly burst into flames, without the application of any apparent cause. (Ans. F) 38) A yellow flame is also called a non-luminous flame where incomplete combustion takes place. (Ans. F) 39) The transfer of heat from one place to another by radiation does not require any medium. (Ans.T) 40) Quick lime is applied to soils which are highly acidic. (Ans. T) 41) Calamine solution is applied over an ant bite because it neutralizes the effect of ant bite which injects base into the skin. (Ans. F) 42) In Galvanization, iron is coated with copper. (Ans. F) 43) Avogadro’s no. is the no. of molecules present in 1 mole of a substance. (Ans. T) 44) Artificial fibers are produced by a process called “Spinning”. (Ans. T) 45) In an atom, when all electron shells are full, the atom is energetically unstable. (Ans. F) 46) Electrons of an unstable atom are obtained by either donating, accepting or sharing electrons with neighboring atoms, forming a chemical reaction. (Ans. T) 47) Generally, non-metals react with acids. (Ans. F) 48) As the kinetic energy of a gas increases, the temperature increases proportionally. (Ans. T) 49) When a solid is heated, the molecules vibrate faster. This cause the spacing between molecules to increase as well as the increase in the size of the molecules. (Ans. F) 50) The mass of one atom of an element is expressed in terms of a.m.u. (Ans. T) Questions from the DVD MCQ 1. The taste of water depends upon the _____ of mineral dissolved. Choose the correct answer to fill in the blank. a) Quantity b) Quality c) Microbes d) None of these (Ans. a ) 2. How many years ago did the first insect appear on earth? a) 450 million years b) 350 million years c) 250 million years d) 100 million years (Ans. b ) 3. S N Bose passed his entrance examination in a) 1920 b) 1910 c) 1909 d) 1900 (Ans. c) 4. The black pepper is also called a) Black diamond b) Black gold c) Black platinum d) Black silver (Ans. b) 5. Vasco Da Gama reached in 1498 at the port named a) Cochin b) Calicut c) Vishakhapatnam d) None of them (Ans. b) 6. Proteins are polymer of a) Fatty acids b) Ketones c) Amino acids d) Glycerol (Ans. c) 7. Who synthesized the first artificial dye? a) William Henry Perkin b) J C Bose c) Lavoisier d) None of them (Ans. a) 8. Dyes are categorized into three types viz. a) Indigo, Vat and Mordant b) Substantive, Vat and Mordant c) Substantive, Indigo and Mordant d) Substantive, Vat and Indigo (Ans. b) 9. Mordant dyes are a) Inorganic oxides or salts b) Organic oxides or salts c) Inorganic acids d) Organic acids (Ans. a) 10. Which chemical is added to destroy the micro-organisms in impure water in water treatment plants? a) Chlorine gas b) Poly aluminum chloride c) Chloride salt d) None of these (Ans. a) 11. The recommended quantity of ginger to be consumed per day for beneficial effect has been worked out is a) 3 to 5 g/day b) 1 to 3 g/day c) 10 to 12 g/day d) 5 to 8 g/day (Ans. a) 12. Scientific name of ginger is a) Ginger officinale b) Gingiber officinale c) Gingiber officinalis d) None of these (Ans. b) 13. Which spice is known as universal medicine? a) Pepper b) Ginger c) Cardamom d) Turmeric (Ans. b) 14. Ginger, cardamom and turmeric three spices belong to the same family a) Zingiberaceae b) Cardamoraceae c) Turmeroraceae d) None of these (Ans. a) 15. Indigo, methyl orange and aniline yellow are a) organic dyes b) inorganic dyes c) acidic compounds d) synthetic dyes (Ans. d) 16. What percentage of all dyes used on moulds are mordant dyes? a) 18% b) 20% c) 30% d) 40% (Ans. c) 17. Urea is also known as a) carbomite b) aspirine c) ammonium cyanide d) none of these (Ans. a) 18. Urea is used to make medicine called urea stabimine used to treat a) kala jar b) diabetes c) cancer d) none of these (Ans. a) 19. Algebra originated in a) east coast b) west coast c) middle coast d) none of these (Ans. c) 20. Each vine produces nearly ______ kg of pepper. Choose the correct answer to fill in the blank. a) 100kg b) 200kg c) 50kg d) 150kg (Ans. a) One word answers 21. Who is the chief minister of Odessa? (Ans. Naveen Patnaik) 22. When was Vishakhapatnam hit by Hood hood? (Ans. 2014) 23. Which instrument measures wind speed and wind pressure? (Ans. Anemometer) 24. Who is the former director of Indian meteorological department? (Ans. K T Joseph) 25. Which spice is good to be used in winter? (Ans. Ginger) 26. How many compounds are present in ginger? (Ans. 2000) 27. Where is National Institute of Nutrition located? (Ans. Hyderabad) 28. What is the name of the protein found in fishes, meat and chickens? (Ans. Collagen) 29. What is the name of the enzyme found in raw papaya? (Ans. Pepsin) 30. What percent of our body weight is made up of water? (Ans. 60-70%) 31. The sun is ______ times as far as it is big. (Ans. 110) 32. A typical flying insect can flap its wings _____ times a second. (Ans. 100-200) 33. The insects have _________ eyes made up of thousands of units to detect split of second movements. (Ans. compound ) 34. The insects have _______ to detect any mechanical sensation. (Ans. antennae) 35. Pepper originated in _________. (Ans. India) True/False 36. The taste of water collect from different sources is same. (Ans. F) 37. When cooked gingerol changes into zingerone which has sweet spicy taste. (Ans. T) 38. Insects have muscular legs that give them lift to take off. (Ans. T) 39. S N Bose was born on !st july, 1894. (Ans. F) 40. The name pepper came from a Sanskrit word papaya. (Ans. F) 41. In France just a pound of pepper corn would free a slave. (Ans. T) 42. The word algebra comes from the word aljabr. (Ans. T) 43. Urea is used as a potassium adding compound in agriculture. (Ans. F) 44. Freidrich Wohler was the first scientist to synthesis organic compound from inorganic compound and the compound was methane. (Ans. F) 45. Water can dissolve a lot of salts and is called universal solvent. (Ans. T) 46. Ginger, cardamom and turmeric three spices belong to a large family. (Ans. T) 47. 2000 bioactive compounds are responsible for unique and medicinal properties of ginger. (Ans. T) 48. S N Bose alone translated Albert Einstein’s theory of relativity from German to English. ( Ans. F) 49. Urea is used as raw material in the manufacture of plastics. (Ans. T) 50. Urea is a blue colored solid amorphous chemical. (Ans. F)