[1] Which among the following coal contains 90 per cent of carbon?
A.
Anthracite
B.
Bitumen
C.
Lignite
D.
Peat
Ans:
Anthracite
Explanation :
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Anthracite contains 90 per cent of carbon.
[2] Exposure to mixtures of chemicals are greater than expected on the basis of effects of expo-sure to each chemical individually. This is known as –
A.
Additives
B.
Antagonism
C.
Synergism
D.
Independent
Ans:
Synergism
Explanation :
When the toxic effect of the mixture is greater than that expected for the sum of individual constituent doses, which is that effects of combined doses are more-than-additive, the interactions are said to be synergistic. Conversely, when the toxic effect of the mixture is less than that expected under the dose additivity assumption, the interactions are said to be antagonistic.
[3] The filter over which sewage is sprinkled is called as –
A.
Trickling filter
B.
Percolating filter
C.
Contact bed
D.
Intermittent sand filter
Ans:
Trickling filter
Explanation :
A trickling filter, also known as percolating filter, is an artificial bed of stone or broken brick material over which waste water or sewage is allowed to sprinkle or to trickle. It is then collected through the under drainage system.
[4] Milk of magnesia is a suspension of –
A.
magnesium sulphate
B.
magnesium carbonate
C.
magnesium hydroxide
D.
magnesium Chloride
Ans:
magnesium hydroxide
Explanation :
Magnesium hydroxide is an inorganic compound with the chemical formula Mg (OH)2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite. Magnesium hydroxide is a common component of antacids and laxatives; it interferes with the absorption of folic acid and iron. Magnesium hydroxide has low solubility in water, with a Ksp of 1.5×10–11; however all of the magnesium hydroxide that does dissolve dissociates.
[5] Which of the following is an iron ore?
A.
Bauxite
B.
Magnetite
C.
Lignite
D.
Nitrite
Ans:
Magnetite
Explanation :
Magnetite is a 'mineral, one of the two common naturally occurring oxides of Iron. It is the most magnetic of all the naturally occurring minerals on Earth.
[6] Iodine value is used to estimate –
A.
Hydroxyl groups in oil
B.
Alkali, content in oil
C.
Unsaturation in oil
D.
Carboxylic groups in oil
Ans:
Unsaturation in oil
Explanation :
The iodine value (or iodine adsorption value or iodine number or iodine index) in chemistry is the mass of iodine in grams that is consumed by 100 grams of a chemical substance. Iodine numbers are often used to determine the amount of unsaturation in fatty acids.
[7] Element 106 was discovered by –
A.
Rutherford
B.
Seaborg
C.
Lawrence
D.
Kurchatove
Ans:
Seaborg
Explanation :
Element 106 was first created and identified in 1974 at LBL by a team of researchers led by LBL physicist Albert Ghiorso and LLNL chemist Kenneth Hulet. It was confirmed in 1993 in an experiment at the 88- Inch Cyclotron led by Ken Gregorich and Darleane Hoffman of the Nuclear Science Division.
[8] Milk of magnesia is an example of a/an -
A.
Acid
B.
Base
C.
Salt
D.
None of the above
Ans:
Base
Explanation :
Milk of Magnesia or Magnesium hydrozide is a base and an antacid. During indigestion, the stomach produces too much acid and this causes pain and irritation. To get rid of this pain, people use bases called antacids.
[9] A bee-sting leaves an acid which causes pain and irritation. The injected acid is -
A.
acetic acid
B.
sulphuric acid
C.
citric acid
D.
methanoic acid
Ans:
methanoic acid
Explanation :
Formic acid (systematically called methanoic acid) is the simplest carboxylic acid. Its formula is CH 2O2 or HCOOH.
[10] Earth's atmosphere is an envelope of gases extending to a height of –
A.
100 km
B.
150 km
C.
200 km
D.
300 km
Ans:
200 km
Explanation :
The atmosphere of the. Earth is an envelope of gases extending to a height of 200km.
[11] In its reaction with silver nitrate, C2H2 shows –
A.
Oxidising property
B.
Reducing property
C.
Basic property
D.
Acidic property
Ans:
Acidic property
Explanation :
When treated with ammoniacal silver nitrate solution alkynes form white precipitate of silver acetylides.
[12] Iron is extracted from -
A.
Cinnabar
B.
Haematite
C.
Bauxite
D.
Dolomite
Ans:
Haematite
Explanation :
Haematite is mined as the main ore of iron. It is harder than pure iron, but much more brittle. It is coloured black to steel or silver-gray, brown to reddish brown, or red.
[13] Which of the following imparts a blue colour to glass?
A.
Cobalt oxide
B.
Copper oxide
C.
Iron oxide
D.
Nickel oxide
Ans:
Cobalt oxide
Explanation :
The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of electrically charged ions which are evenly distributed in the glass during manufacture also gives glass a characteristic colour. Cobalt oxide: deep blue colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.
[14] Of the following, which one pol-lutes the air of a big City?
A.
Copper
B.
Chromium
C.
Lead
D.
Cadmium
Ans:
Lead
Explanation :
The most common source of lead air pollution is from metal processing, but there are other manufacturing and industry sources as well. The highest lead air pollution levels are found near battery manufacturing and iron and other metal producing plants. Lead air pollution is a dangerous form of pollution because of the way lead builds up in our bodies.
[15] Wood spirit is –
A.
Methyl alcohol
B.
Ethyl alcohol
C.
Butyl alcohol
D.
Propyl alcohol
Ans:
Methyl alcohol
Explanation :
Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen.
[16] Which one of the following petroleum refinery products has the lowest boiling point?
A.
Kerosene
B.
Gasoline
C.
Diesel
D.
Lubricating oil
Ans:
Lubricating oil
Explanation :
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic.
[17] Liquid metal is -
A.
Mercury
B.
Sodium
C.
Antimony
D.
None
Ans:
Mercury
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Anthracite contains 90 per cent of carbon.
[2] Exposure to mixtures of chemicals are greater than expected on the basis of effects of expo-sure to each chemical individually. This is known as –
A.
Additives
B.
Antagonism
C.
Synergism
D.
Independent
Ans:
Synergism
Explanation :
When the toxic effect of the mixture is greater than that expected for the sum of individual constituent doses, which is that effects of combined doses are more-than-additive, the interactions are said to be synergistic. Conversely, when the toxic effect of the mixture is less than that expected under the dose additivity assumption, the interactions are said to be antagonistic.
[3] The filter over which sewage is sprinkled is called as –
A.
Trickling filter
B.
Percolating filter
C.
Contact bed
D.
Intermittent sand filter
Ans:
Trickling filter
Explanation :
A trickling filter, also known as percolating filter, is an artificial bed of stone or broken brick material over which waste water or sewage is allowed to sprinkle or to trickle. It is then collected through the under drainage system.
[4] Milk of magnesia is a suspension of –
A.
magnesium sulphate
B.
magnesium carbonate
C.
magnesium hydroxide
D.
magnesium Chloride
Ans:
magnesium hydroxide
Explanation :
Magnesium hydroxide is an inorganic compound with the chemical formula Mg (OH)2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite. Magnesium hydroxide is a common component of antacids and laxatives; it interferes with the absorption of folic acid and iron. Magnesium hydroxide has low solubility in water, with a Ksp of 1.5×10–11; however all of the magnesium hydroxide that does dissolve dissociates.
[5] Which of the following is an iron ore?
A.
Bauxite
B.
Magnetite
C.
Lignite
D.
Nitrite
Ans:
Magnetite
Explanation :
Magnetite is a 'mineral, one of the two common naturally occurring oxides of Iron. It is the most magnetic of all the naturally occurring minerals on Earth.
[6] Iodine value is used to estimate –
A.
Hydroxyl groups in oil
B.
Alkali, content in oil
C.
Unsaturation in oil
D.
Carboxylic groups in oil
Ans:
Unsaturation in oil
Explanation :
The iodine value (or iodine adsorption value or iodine number or iodine index) in chemistry is the mass of iodine in grams that is consumed by 100 grams of a chemical substance. Iodine numbers are often used to determine the amount of unsaturation in fatty acids.
[7] Element 106 was discovered by –
A.
Rutherford
B.
Seaborg
C.
Lawrence
D.
Kurchatove
Ans:
Seaborg
Explanation :
Element 106 was first created and identified in 1974 at LBL by a team of researchers led by LBL physicist Albert Ghiorso and LLNL chemist Kenneth Hulet. It was confirmed in 1993 in an experiment at the 88- Inch Cyclotron led by Ken Gregorich and Darleane Hoffman of the Nuclear Science Division.
[8] Milk of magnesia is an example of a/an -
A.
Acid
B.
Base
C.
Salt
D.
None of the above
Ans:
Base
Explanation :
Milk of Magnesia or Magnesium hydrozide is a base and an antacid. During indigestion, the stomach produces too much acid and this causes pain and irritation. To get rid of this pain, people use bases called antacids.
[9] A bee-sting leaves an acid which causes pain and irritation. The injected acid is -
A.
acetic acid
B.
sulphuric acid
C.
citric acid
D.
methanoic acid
Ans:
methanoic acid
Explanation :
Formic acid (systematically called methanoic acid) is the simplest carboxylic acid. Its formula is CH 2O2 or HCOOH.
[10] Earth's atmosphere is an envelope of gases extending to a height of –
A.
100 km
B.
150 km
C.
200 km
D.
300 km
Ans:
200 km
Explanation :
The atmosphere of the. Earth is an envelope of gases extending to a height of 200km.
[11] In its reaction with silver nitrate, C2H2 shows –
A.
Oxidising property
B.
Reducing property
C.
Basic property
D.
Acidic property
Ans:
Acidic property
Explanation :
When treated with ammoniacal silver nitrate solution alkynes form white precipitate of silver acetylides.
[12] Iron is extracted from -
A.
Cinnabar
B.
Haematite
C.
Bauxite
D.
Dolomite
Ans:
Haematite
Explanation :
Haematite is mined as the main ore of iron. It is harder than pure iron, but much more brittle. It is coloured black to steel or silver-gray, brown to reddish brown, or red.
[13] Which of the following imparts a blue colour to glass?
A.
Cobalt oxide
B.
Copper oxide
C.
Iron oxide
D.
Nickel oxide
Ans:
Cobalt oxide
Explanation :
The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of electrically charged ions which are evenly distributed in the glass during manufacture also gives glass a characteristic colour. Cobalt oxide: deep blue colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.
[14] Of the following, which one pol-lutes the air of a big City?
A.
Copper
B.
Chromium
C.
Lead
D.
Cadmium
Ans:
Lead
Explanation :
The most common source of lead air pollution is from metal processing, but there are other manufacturing and industry sources as well. The highest lead air pollution levels are found near battery manufacturing and iron and other metal producing plants. Lead air pollution is a dangerous form of pollution because of the way lead builds up in our bodies.
[15] Wood spirit is –
A.
Methyl alcohol
B.
Ethyl alcohol
C.
Butyl alcohol
D.
Propyl alcohol
Ans:
Methyl alcohol
Explanation :
Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen.
[16] Which one of the following petroleum refinery products has the lowest boiling point?
A.
Kerosene
B.
Gasoline
C.
Diesel
D.
Lubricating oil
Ans:
Lubricating oil
Explanation :
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic.
[17] Liquid metal is -
A.
Mercury
B.
Sodium
C.
Antimony
D.
None
Ans:
Mercury
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
A trickling filter, also known as percolating filter, is an artificial bed of stone or broken brick material over which waste water or sewage is allowed to sprinkle or to trickle. It is then collected through the under drainage system.
[4] Milk of magnesia is a suspension of –
A.
magnesium sulphate
B.
magnesium carbonate
C.
magnesium hydroxide
D.
magnesium Chloride
Ans:
magnesium hydroxide
Explanation :
Magnesium hydroxide is an inorganic compound with the chemical formula Mg (OH)2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite. Magnesium hydroxide is a common component of antacids and laxatives; it interferes with the absorption of folic acid and iron. Magnesium hydroxide has low solubility in water, with a Ksp of 1.5×10–11; however all of the magnesium hydroxide that does dissolve dissociates.
[5] Which of the following is an iron ore?
A.
Bauxite
B.
Magnetite
C.
Lignite
D.
Nitrite
Ans:
Magnetite
Explanation :
Magnetite is a 'mineral, one of the two common naturally occurring oxides of Iron. It is the most magnetic of all the naturally occurring minerals on Earth.
[6] Iodine value is used to estimate –
A.
Hydroxyl groups in oil
B.
Alkali, content in oil
C.
Unsaturation in oil
D.
Carboxylic groups in oil
Ans:
Unsaturation in oil
Explanation :
The iodine value (or iodine adsorption value or iodine number or iodine index) in chemistry is the mass of iodine in grams that is consumed by 100 grams of a chemical substance. Iodine numbers are often used to determine the amount of unsaturation in fatty acids.
[7] Element 106 was discovered by –
A.
Rutherford
B.
Seaborg
C.
Lawrence
D.
Kurchatove
Ans:
Seaborg
Explanation :
Element 106 was first created and identified in 1974 at LBL by a team of researchers led by LBL physicist Albert Ghiorso and LLNL chemist Kenneth Hulet. It was confirmed in 1993 in an experiment at the 88- Inch Cyclotron led by Ken Gregorich and Darleane Hoffman of the Nuclear Science Division.
[8] Milk of magnesia is an example of a/an -
A.
Acid
B.
Base
C.
Salt
D.
None of the above
Ans:
Base
Explanation :
Milk of Magnesia or Magnesium hydrozide is a base and an antacid. During indigestion, the stomach produces too much acid and this causes pain and irritation. To get rid of this pain, people use bases called antacids.
[9] A bee-sting leaves an acid which causes pain and irritation. The injected acid is -
A.
acetic acid
B.
sulphuric acid
C.
citric acid
D.
methanoic acid
Ans:
methanoic acid
Explanation :
Formic acid (systematically called methanoic acid) is the simplest carboxylic acid. Its formula is CH 2O2 or HCOOH.
[10] Earth's atmosphere is an envelope of gases extending to a height of –
A.
100 km
B.
150 km
C.
200 km
D.
300 km
Ans:
200 km
Explanation :
The atmosphere of the. Earth is an envelope of gases extending to a height of 200km.
[11] In its reaction with silver nitrate, C2H2 shows –
A.
Oxidising property
B.
Reducing property
C.
Basic property
D.
Acidic property
Ans:
Acidic property
Explanation :
When treated with ammoniacal silver nitrate solution alkynes form white precipitate of silver acetylides.
[12] Iron is extracted from -
A.
Cinnabar
B.
Haematite
C.
Bauxite
D.
Dolomite
Ans:
Haematite
Explanation :
Haematite is mined as the main ore of iron. It is harder than pure iron, but much more brittle. It is coloured black to steel or silver-gray, brown to reddish brown, or red.
[13] Which of the following imparts a blue colour to glass?
A.
Cobalt oxide
B.
Copper oxide
C.
Iron oxide
D.
Nickel oxide
Ans:
Cobalt oxide
Explanation :
The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of electrically charged ions which are evenly distributed in the glass during manufacture also gives glass a characteristic colour. Cobalt oxide: deep blue colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.
[14] Of the following, which one pol-lutes the air of a big City?
A.
Copper
B.
Chromium
C.
Lead
D.
Cadmium
Ans:
Lead
Explanation :
The most common source of lead air pollution is from metal processing, but there are other manufacturing and industry sources as well. The highest lead air pollution levels are found near battery manufacturing and iron and other metal producing plants. Lead air pollution is a dangerous form of pollution because of the way lead builds up in our bodies.
[15] Wood spirit is –
A.
Methyl alcohol
B.
Ethyl alcohol
C.
Butyl alcohol
D.
Propyl alcohol
Ans:
Methyl alcohol
Explanation :
Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen.
[16] Which one of the following petroleum refinery products has the lowest boiling point?
A.
Kerosene
B.
Gasoline
C.
Diesel
D.
Lubricating oil
Ans:
Lubricating oil
Explanation :
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic.
[17] Liquid metal is -
A.
Mercury
B.
Sodium
C.
Antimony
D.
None
Ans:
Mercury
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
Magnetite is a 'mineral, one of the two common naturally occurring oxides of Iron. It is the most magnetic of all the naturally occurring minerals on Earth.
[6] Iodine value is used to estimate –
A.
Hydroxyl groups in oil
B.
Alkali, content in oil
C.
Unsaturation in oil
D.
Carboxylic groups in oil
Ans:
Unsaturation in oil
Explanation :
The iodine value (or iodine adsorption value or iodine number or iodine index) in chemistry is the mass of iodine in grams that is consumed by 100 grams of a chemical substance. Iodine numbers are often used to determine the amount of unsaturation in fatty acids.
[7] Element 106 was discovered by –
A.
Rutherford
B.
Seaborg
C.
Lawrence
D.
Kurchatove
Ans:
Seaborg
Explanation :
Element 106 was first created and identified in 1974 at LBL by a team of researchers led by LBL physicist Albert Ghiorso and LLNL chemist Kenneth Hulet. It was confirmed in 1993 in an experiment at the 88- Inch Cyclotron led by Ken Gregorich and Darleane Hoffman of the Nuclear Science Division.
[8] Milk of magnesia is an example of a/an -
A.
Acid
B.
Base
C.
Salt
D.
None of the above
Ans:
Base
Explanation :
Milk of Magnesia or Magnesium hydrozide is a base and an antacid. During indigestion, the stomach produces too much acid and this causes pain and irritation. To get rid of this pain, people use bases called antacids.
[9] A bee-sting leaves an acid which causes pain and irritation. The injected acid is -
A.
acetic acid
B.
sulphuric acid
C.
citric acid
D.
methanoic acid
Ans:
methanoic acid
Explanation :
Formic acid (systematically called methanoic acid) is the simplest carboxylic acid. Its formula is CH 2O2 or HCOOH.
[10] Earth's atmosphere is an envelope of gases extending to a height of –
A.
100 km
B.
150 km
C.
200 km
D.
300 km
Ans:
200 km
Explanation :
The atmosphere of the. Earth is an envelope of gases extending to a height of 200km.
[11] In its reaction with silver nitrate, C2H2 shows –
A.
Oxidising property
B.
Reducing property
C.
Basic property
D.
Acidic property
Ans:
Acidic property
Explanation :
When treated with ammoniacal silver nitrate solution alkynes form white precipitate of silver acetylides.
[12] Iron is extracted from -
A.
Cinnabar
B.
Haematite
C.
Bauxite
D.
Dolomite
Ans:
Haematite
Explanation :
Haematite is mined as the main ore of iron. It is harder than pure iron, but much more brittle. It is coloured black to steel or silver-gray, brown to reddish brown, or red.
[13] Which of the following imparts a blue colour to glass?
A.
Cobalt oxide
B.
Copper oxide
C.
Iron oxide
D.
Nickel oxide
Ans:
Cobalt oxide
Explanation :
The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of electrically charged ions which are evenly distributed in the glass during manufacture also gives glass a characteristic colour. Cobalt oxide: deep blue colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.
[14] Of the following, which one pol-lutes the air of a big City?
A.
Copper
B.
Chromium
C.
Lead
D.
Cadmium
Ans:
Lead
Explanation :
The most common source of lead air pollution is from metal processing, but there are other manufacturing and industry sources as well. The highest lead air pollution levels are found near battery manufacturing and iron and other metal producing plants. Lead air pollution is a dangerous form of pollution because of the way lead builds up in our bodies.
[15] Wood spirit is –
A.
Methyl alcohol
B.
Ethyl alcohol
C.
Butyl alcohol
D.
Propyl alcohol
Ans:
Methyl alcohol
Explanation :
Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen.
[16] Which one of the following petroleum refinery products has the lowest boiling point?
A.
Kerosene
B.
Gasoline
C.
Diesel
D.
Lubricating oil
Ans:
Lubricating oil
Explanation :
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic.
[17] Liquid metal is -
A.
Mercury
B.
Sodium
C.
Antimony
D.
None
Ans:
Mercury
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
Element 106 was first created and identified in 1974 at LBL by a team of researchers led by LBL physicist Albert Ghiorso and LLNL chemist Kenneth Hulet. It was confirmed in 1993 in an experiment at the 88- Inch Cyclotron led by Ken Gregorich and Darleane Hoffman of the Nuclear Science Division.
[8] Milk of magnesia is an example of a/an -
A.
Acid
B.
Base
C.
Salt
D.
None of the above
Ans:
Base
Explanation :
Milk of Magnesia or Magnesium hydrozide is a base and an antacid. During indigestion, the stomach produces too much acid and this causes pain and irritation. To get rid of this pain, people use bases called antacids.
[9] A bee-sting leaves an acid which causes pain and irritation. The injected acid is -
A.
acetic acid
B.
sulphuric acid
C.
citric acid
D.
methanoic acid
Ans:
methanoic acid
Explanation :
Formic acid (systematically called methanoic acid) is the simplest carboxylic acid. Its formula is CH 2O2 or HCOOH.
[10] Earth's atmosphere is an envelope of gases extending to a height of –
A.
100 km
B.
150 km
C.
200 km
D.
300 km
Ans:
200 km
Explanation :
The atmosphere of the. Earth is an envelope of gases extending to a height of 200km.
[11] In its reaction with silver nitrate, C2H2 shows –
A.
Oxidising property
B.
Reducing property
C.
Basic property
D.
Acidic property
Ans:
Acidic property
Explanation :
When treated with ammoniacal silver nitrate solution alkynes form white precipitate of silver acetylides.
[12] Iron is extracted from -
A.
Cinnabar
B.
Haematite
C.
Bauxite
D.
Dolomite
Ans:
Haematite
Explanation :
Haematite is mined as the main ore of iron. It is harder than pure iron, but much more brittle. It is coloured black to steel or silver-gray, brown to reddish brown, or red.
[13] Which of the following imparts a blue colour to glass?
A.
Cobalt oxide
B.
Copper oxide
C.
Iron oxide
D.
Nickel oxide
Ans:
Cobalt oxide
Explanation :
The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of electrically charged ions which are evenly distributed in the glass during manufacture also gives glass a characteristic colour. Cobalt oxide: deep blue colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.
[14] Of the following, which one pol-lutes the air of a big City?
A.
Copper
B.
Chromium
C.
Lead
D.
Cadmium
Ans:
Lead
Explanation :
The most common source of lead air pollution is from metal processing, but there are other manufacturing and industry sources as well. The highest lead air pollution levels are found near battery manufacturing and iron and other metal producing plants. Lead air pollution is a dangerous form of pollution because of the way lead builds up in our bodies.
[15] Wood spirit is –
A.
Methyl alcohol
B.
Ethyl alcohol
C.
Butyl alcohol
D.
Propyl alcohol
Ans:
Methyl alcohol
Explanation :
Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen.
[16] Which one of the following petroleum refinery products has the lowest boiling point?
A.
Kerosene
B.
Gasoline
C.
Diesel
D.
Lubricating oil
Ans:
Lubricating oil
Explanation :
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic.
[17] Liquid metal is -
A.
Mercury
B.
Sodium
C.
Antimony
D.
None
Ans:
Mercury
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
Formic acid (systematically called methanoic acid) is the simplest carboxylic acid. Its formula is CH 2O2 or HCOOH.
[10] Earth's atmosphere is an envelope of gases extending to a height of –
A.
100 km
B.
150 km
C.
200 km
D.
300 km
Ans:
200 km
Explanation :
The atmosphere of the. Earth is an envelope of gases extending to a height of 200km.
[11] In its reaction with silver nitrate, C2H2 shows –
A.
Oxidising property
B.
Reducing property
C.
Basic property
D.
Acidic property
Ans:
Acidic property
Explanation :
When treated with ammoniacal silver nitrate solution alkynes form white precipitate of silver acetylides.
[12] Iron is extracted from -
A.
Cinnabar
B.
Haematite
C.
Bauxite
D.
Dolomite
Ans:
Haematite
Explanation :
Haematite is mined as the main ore of iron. It is harder than pure iron, but much more brittle. It is coloured black to steel or silver-gray, brown to reddish brown, or red.
[13] Which of the following imparts a blue colour to glass?
A.
Cobalt oxide
B.
Copper oxide
C.
Iron oxide
D.
Nickel oxide
Ans:
Cobalt oxide
Explanation :
The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of electrically charged ions which are evenly distributed in the glass during manufacture also gives glass a characteristic colour. Cobalt oxide: deep blue colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.
[14] Of the following, which one pol-lutes the air of a big City?
A.
Copper
B.
Chromium
C.
Lead
D.
Cadmium
Ans:
Lead
Explanation :
The most common source of lead air pollution is from metal processing, but there are other manufacturing and industry sources as well. The highest lead air pollution levels are found near battery manufacturing and iron and other metal producing plants. Lead air pollution is a dangerous form of pollution because of the way lead builds up in our bodies.
[15] Wood spirit is –
A.
Methyl alcohol
B.
Ethyl alcohol
C.
Butyl alcohol
D.
Propyl alcohol
Ans:
Methyl alcohol
Explanation :
Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen.
[16] Which one of the following petroleum refinery products has the lowest boiling point?
A.
Kerosene
B.
Gasoline
C.
Diesel
D.
Lubricating oil
Ans:
Lubricating oil
Explanation :
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic.
[17] Liquid metal is -
A.
Mercury
B.
Sodium
C.
Antimony
D.
None
Ans:
Mercury
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
When treated with ammoniacal silver nitrate solution alkynes form white precipitate of silver acetylides.
[12] Iron is extracted from -
A.
Cinnabar
B.
Haematite
C.
Bauxite
D.
Dolomite
Ans:
Haematite
Explanation :
Haematite is mined as the main ore of iron. It is harder than pure iron, but much more brittle. It is coloured black to steel or silver-gray, brown to reddish brown, or red.
[13] Which of the following imparts a blue colour to glass?
A.
Cobalt oxide
B.
Copper oxide
C.
Iron oxide
D.
Nickel oxide
Ans:
Cobalt oxide
Explanation :
The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of electrically charged ions which are evenly distributed in the glass during manufacture also gives glass a characteristic colour. Cobalt oxide: deep blue colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.
[14] Of the following, which one pol-lutes the air of a big City?
A.
Copper
B.
Chromium
C.
Lead
D.
Cadmium
Ans:
Lead
Explanation :
The most common source of lead air pollution is from metal processing, but there are other manufacturing and industry sources as well. The highest lead air pollution levels are found near battery manufacturing and iron and other metal producing plants. Lead air pollution is a dangerous form of pollution because of the way lead builds up in our bodies.
[15] Wood spirit is –
A.
Methyl alcohol
B.
Ethyl alcohol
C.
Butyl alcohol
D.
Propyl alcohol
Ans:
Methyl alcohol
Explanation :
Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen.
[16] Which one of the following petroleum refinery products has the lowest boiling point?
A.
Kerosene
B.
Gasoline
C.
Diesel
D.
Lubricating oil
Ans:
Lubricating oil
Explanation :
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic.
[17] Liquid metal is -
A.
Mercury
B.
Sodium
C.
Antimony
D.
None
Ans:
Mercury
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of electrically charged ions which are evenly distributed in the glass during manufacture also gives glass a characteristic colour. Cobalt oxide: deep blue colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.
[14] Of the following, which one pol-lutes the air of a big City?
A.
Copper
B.
Chromium
C.
Lead
D.
Cadmium
Ans:
Lead
Explanation :
The most common source of lead air pollution is from metal processing, but there are other manufacturing and industry sources as well. The highest lead air pollution levels are found near battery manufacturing and iron and other metal producing plants. Lead air pollution is a dangerous form of pollution because of the way lead builds up in our bodies.
[15] Wood spirit is –
A.
Methyl alcohol
B.
Ethyl alcohol
C.
Butyl alcohol
D.
Propyl alcohol
Ans:
Methyl alcohol
Explanation :
Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen.
[16] Which one of the following petroleum refinery products has the lowest boiling point?
A.
Kerosene
B.
Gasoline
C.
Diesel
D.
Lubricating oil
Ans:
Lubricating oil
Explanation :
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic.
[17] Liquid metal is -
A.
Mercury
B.
Sodium
C.
Antimony
D.
None
Ans:
Mercury
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen.
[16] Which one of the following petroleum refinery products has the lowest boiling point?
A.
Kerosene
B.
Gasoline
C.
Diesel
D.
Lubricating oil
Ans:
Lubricating oil
Explanation :
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic.
[17] Liquid metal is -
A.
Mercury
B.
Sodium
C.
Antimony
D.
None
Ans:
Mercury
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
[18] Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Fledspar
B.
Arsenic oxide
C.
Potassium Carbonate
D.
Soda Ash
Ans:
Arsenic oxide
Explanation :
0
[19] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
A.
Amino phenyl alanine
B.
Hydroxy phenyl alanine
C.
Phenyl alanine
D.
Dihydroxy phenyl alanine
Ans:
Dihydroxy phenyl alanine
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.
[20] Nitrogen is an essential constituent of all:
A.
Fats
B.
Proteins
C.
Vitamins
D.
Carbohydrates
Ans:
Proteins
Explanation :
Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.
[21] This substance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
A.
Baking soda
B.
Bleaching powder
C.
Vinegar
D.
Artificial sweeteners
Ans:
Baking soda
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise.
[22] Ferrous sulphate is used in water treatment as a/an -
A.
Oxidizing agent
B.
Reducing agent
C.
Coagulant aid
D.
Adsorbent
Ans:
Coagulant aid
Explanation :
0
[23] Philosopher's Wool is -
A.
Zinc carbonate
B.
Zinc sulphate
C.
Zinc oxide
D.
Zinc blende
Ans:
Zinc oxide
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
Philosopher's wool is chemically zinc oxide.
[24] The process by which milk is converted to curd is called –
A.
Pasteurization
B.
Vernalization
C.
Fermentation
D.
Retting
Ans:
Fermentation
Explanation :
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk.
[25] The technique of calculating the age of fossil organisms is -
A.
Radiocarbon dating
B.
Electroporation
C.
Counting the annual rings
D.
Micromanipulation
Ans:
Radiocarbon dating
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.
Explanation :
Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949.