[1] Neutron was discovered by -
A.
Chadwick
B.
Rutherford
C.
Fermi
D.
Bohr
Ans:
Chadwick
Explanation :
Neutron was discovered by James Chadwick in the year 1932. The neutron is a subatomic particle, symbol n or n⁰, with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons constitute the nuclei of atoms.
[2] Iodine can be separated from a mixture of Iodine and Potassium Chloride by -
A.
Filtration
B.
Sublimation
C.
Distillation
D.
Sedimentation
Ans:
Sublimation
Explanation :
Iodine can be separated from a mixture of Iodine and Potassium Chloride by Sublimation. Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.
[3] Which of the following produces H2 gas, when reacts with acid?
A.
Zn
B.
S
C.
C
D.
O
Ans:
Zn
Explanation :
As, Zinc is a metal so it will produce H2 gas when reacts with acid. Active metals react with acids to produce hydrogen because they are above hydrogen in the activity series.
[4] Which one of the following is commonly used for pulp bleaching in the paper industry?
A.
Mild sulphuric acid
B.
Glucose isomerase
C.
Hydrogen peroxide
D.
Iodine and water
Ans:
Hydrogen peroxide
Explanation :
Bleaching of wood pulp is the chemical processing carried out to decrease the color of the pulp, so that it becomes whiter. Alkaline hydrogen peroxide is the most commonly used bleaching agent for mechanical pulp. It selectively oxidizes non-aromatic conjugated groups responsible for absorbing visible light. The decomposition of hydrogen peroxide is catalyzed by transition metals.
[5] Biofertilizers convert nitrogen to .
A.
nitrates
B.
ammonia
C.
nitrogenase
D.
amino acids
Ans:
ammonia
Explanation :
Bio-fertilizers are micro-organisms which bring about nutrient enrichment of soil by enhancing the availability of nutrients to crops. The micro-organisms which act as bio-fertilizers are bacteria, cyano- bacteria (blue green algae) and mycorrhizal fungi. The symbiotic nitrogen-fixing bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
[6] Radioactivity was discovered by _.
A.
J.J. Thomson
B.
W.Roentgen
C.
H.Becquerel
D.
M. Curie
Ans:
H.Becquerel
Explanation :
Antoine-Henri Becquerel is known for his discovery of radioactivity, for which he received the Nobel Prize for Physics in 1903. Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability.
[7] Which one of the following can be oxidized to the corresponding carbonyl compound -
A.
O-Nitrophenol
B.
Phenol
C.
2-methyl-2-hydroxy propane
D.
2-hydroxy propane
Ans:
2-hydroxy propane
Explanation :
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon lo make steel and has the effect of increasing the hardness and strength of iron. Pure iron cannot be hardened or strengthened by heat treatment but the addition of carbon enables a wide range of hardness and strength. High-carbon stainless steel contains a minimum of 0.3% carbon. The higher the carbon content, the less formable and the tougher the steel becomes.
[9] Which of the following is not soluble in water?
A.
Lead Sulphate
B.
Zinc sulphate
C.
Potassium sulphate
D.
Sodium sulphate
Ans:
Zinc sulphate
Explanation :
Lead sulfate (PbSO4) is a white crystalline solid. It is insoluble in water and sinks in it. It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged. It is also known as fast white, milk white, sulfuric acid lead salt or anglesite.
[10] Isotopes differ in -
A.
No. of electrons
B.
No. of protons
C.
No. of neutrons
D.
Chemical reactivity
Ans:
No. of neutrons
Explanation :
Isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons.
[11] Modern periodic law had been given by -
A.
Moseley
B.
Mendeleev
C.
Lother-Mayer
D.
Lavoisier
Ans:
Moseley
Explanation :
In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
[12] Iron filings can be separated from a heterogenous mixture using the technique of :
A.
Sublimation
B.
Magnetization
C.
Sedimentation
D.
Evaporation
Ans:
Magnetization
Explanation :
The method of separation using magnets is used when one of the components is magnetic. So the heterogeneous mixture of iron filings and some other material (such as sulphur powder) can be separated by using magnets. Similarly, a mixture of sand and iron filings can be separated by magnet.
[13] The most abundant element by number in the living system is :
A.
Nitrogen
B.
Hydrogen
C.
Oxygen
D.
Carbon
Ans:
Hydrogen
Explanation :
In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water.
[14] Who discovered Potassium?
A.
Humphry Davy
B.
Alan Turing
C.
Bill Gates
D.
Tim Berners-Lee
Ans:
Humphry Davy
Explanation :
Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile.
[15] Air is -
A.
Compound
B.
Element
C.
Mixture
D.
Solution
Ans:
Mixture
Explanation :
Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
[16] What is the formula of potassium ion in the noble gas state?
A.
K⁺
B.
K²⁺
C.
K²⁻
D.
K⁻
Ans:
K⁺
Explanation :
0
[17] Bauxite is used as raw material by which industry?
A.
Aluminium
B.
Iron
C.
Steel
D.
Gold
Ans:
Aluminium
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
Neutron was discovered by James Chadwick in the year 1932. The neutron is a subatomic particle, symbol n or n⁰, with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons constitute the nuclei of atoms.
[2] Iodine can be separated from a mixture of Iodine and Potassium Chloride by -
A.
Filtration
B.
Sublimation
C.
Distillation
D.
Sedimentation
Ans:
Sublimation
Explanation :
Iodine can be separated from a mixture of Iodine and Potassium Chloride by Sublimation. Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.
[3] Which of the following produces H2 gas, when reacts with acid?
A.
Zn
B.
S
C.
C
D.
O
Ans:
Zn
Explanation :
As, Zinc is a metal so it will produce H2 gas when reacts with acid. Active metals react with acids to produce hydrogen because they are above hydrogen in the activity series.
[4] Which one of the following is commonly used for pulp bleaching in the paper industry?
A.
Mild sulphuric acid
B.
Glucose isomerase
C.
Hydrogen peroxide
D.
Iodine and water
Ans:
Hydrogen peroxide
Explanation :
Bleaching of wood pulp is the chemical processing carried out to decrease the color of the pulp, so that it becomes whiter. Alkaline hydrogen peroxide is the most commonly used bleaching agent for mechanical pulp. It selectively oxidizes non-aromatic conjugated groups responsible for absorbing visible light. The decomposition of hydrogen peroxide is catalyzed by transition metals.
[5] Biofertilizers convert nitrogen to .
A.
nitrates
B.
ammonia
C.
nitrogenase
D.
amino acids
Ans:
ammonia
Explanation :
Bio-fertilizers are micro-organisms which bring about nutrient enrichment of soil by enhancing the availability of nutrients to crops. The micro-organisms which act as bio-fertilizers are bacteria, cyano- bacteria (blue green algae) and mycorrhizal fungi. The symbiotic nitrogen-fixing bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
[6] Radioactivity was discovered by _.
A.
J.J. Thomson
B.
W.Roentgen
C.
H.Becquerel
D.
M. Curie
Ans:
H.Becquerel
Explanation :
Antoine-Henri Becquerel is known for his discovery of radioactivity, for which he received the Nobel Prize for Physics in 1903. Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability.
[7] Which one of the following can be oxidized to the corresponding carbonyl compound -
A.
O-Nitrophenol
B.
Phenol
C.
2-methyl-2-hydroxy propane
D.
2-hydroxy propane
Ans:
2-hydroxy propane
Explanation :
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon lo make steel and has the effect of increasing the hardness and strength of iron. Pure iron cannot be hardened or strengthened by heat treatment but the addition of carbon enables a wide range of hardness and strength. High-carbon stainless steel contains a minimum of 0.3% carbon. The higher the carbon content, the less formable and the tougher the steel becomes.
[9] Which of the following is not soluble in water?
A.
Lead Sulphate
B.
Zinc sulphate
C.
Potassium sulphate
D.
Sodium sulphate
Ans:
Zinc sulphate
Explanation :
Lead sulfate (PbSO4) is a white crystalline solid. It is insoluble in water and sinks in it. It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged. It is also known as fast white, milk white, sulfuric acid lead salt or anglesite.
[10] Isotopes differ in -
A.
No. of electrons
B.
No. of protons
C.
No. of neutrons
D.
Chemical reactivity
Ans:
No. of neutrons
Explanation :
Isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons.
[11] Modern periodic law had been given by -
A.
Moseley
B.
Mendeleev
C.
Lother-Mayer
D.
Lavoisier
Ans:
Moseley
Explanation :
In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
[12] Iron filings can be separated from a heterogenous mixture using the technique of :
A.
Sublimation
B.
Magnetization
C.
Sedimentation
D.
Evaporation
Ans:
Magnetization
Explanation :
The method of separation using magnets is used when one of the components is magnetic. So the heterogeneous mixture of iron filings and some other material (such as sulphur powder) can be separated by using magnets. Similarly, a mixture of sand and iron filings can be separated by magnet.
[13] The most abundant element by number in the living system is :
A.
Nitrogen
B.
Hydrogen
C.
Oxygen
D.
Carbon
Ans:
Hydrogen
Explanation :
In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water.
[14] Who discovered Potassium?
A.
Humphry Davy
B.
Alan Turing
C.
Bill Gates
D.
Tim Berners-Lee
Ans:
Humphry Davy
Explanation :
Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile.
[15] Air is -
A.
Compound
B.
Element
C.
Mixture
D.
Solution
Ans:
Mixture
Explanation :
Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
[16] What is the formula of potassium ion in the noble gas state?
A.
K⁺
B.
K²⁺
C.
K²⁻
D.
K⁻
Ans:
K⁺
Explanation :
0
[17] Bauxite is used as raw material by which industry?
A.
Aluminium
B.
Iron
C.
Steel
D.
Gold
Ans:
Aluminium
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
As, Zinc is a metal so it will produce H2 gas when reacts with acid. Active metals react with acids to produce hydrogen because they are above hydrogen in the activity series.
[4] Which one of the following is commonly used for pulp bleaching in the paper industry?
A.
Mild sulphuric acid
B.
Glucose isomerase
C.
Hydrogen peroxide
D.
Iodine and water
Ans:
Hydrogen peroxide
Explanation :
Bleaching of wood pulp is the chemical processing carried out to decrease the color of the pulp, so that it becomes whiter. Alkaline hydrogen peroxide is the most commonly used bleaching agent for mechanical pulp. It selectively oxidizes non-aromatic conjugated groups responsible for absorbing visible light. The decomposition of hydrogen peroxide is catalyzed by transition metals.
[5] Biofertilizers convert nitrogen to .
A.
nitrates
B.
ammonia
C.
nitrogenase
D.
amino acids
Ans:
ammonia
Explanation :
Bio-fertilizers are micro-organisms which bring about nutrient enrichment of soil by enhancing the availability of nutrients to crops. The micro-organisms which act as bio-fertilizers are bacteria, cyano- bacteria (blue green algae) and mycorrhizal fungi. The symbiotic nitrogen-fixing bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
[6] Radioactivity was discovered by _.
A.
J.J. Thomson
B.
W.Roentgen
C.
H.Becquerel
D.
M. Curie
Ans:
H.Becquerel
Explanation :
Antoine-Henri Becquerel is known for his discovery of radioactivity, for which he received the Nobel Prize for Physics in 1903. Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability.
[7] Which one of the following can be oxidized to the corresponding carbonyl compound -
A.
O-Nitrophenol
B.
Phenol
C.
2-methyl-2-hydroxy propane
D.
2-hydroxy propane
Ans:
2-hydroxy propane
Explanation :
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon lo make steel and has the effect of increasing the hardness and strength of iron. Pure iron cannot be hardened or strengthened by heat treatment but the addition of carbon enables a wide range of hardness and strength. High-carbon stainless steel contains a minimum of 0.3% carbon. The higher the carbon content, the less formable and the tougher the steel becomes.
[9] Which of the following is not soluble in water?
A.
Lead Sulphate
B.
Zinc sulphate
C.
Potassium sulphate
D.
Sodium sulphate
Ans:
Zinc sulphate
Explanation :
Lead sulfate (PbSO4) is a white crystalline solid. It is insoluble in water and sinks in it. It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged. It is also known as fast white, milk white, sulfuric acid lead salt or anglesite.
[10] Isotopes differ in -
A.
No. of electrons
B.
No. of protons
C.
No. of neutrons
D.
Chemical reactivity
Ans:
No. of neutrons
Explanation :
Isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons.
[11] Modern periodic law had been given by -
A.
Moseley
B.
Mendeleev
C.
Lother-Mayer
D.
Lavoisier
Ans:
Moseley
Explanation :
In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
[12] Iron filings can be separated from a heterogenous mixture using the technique of :
A.
Sublimation
B.
Magnetization
C.
Sedimentation
D.
Evaporation
Ans:
Magnetization
Explanation :
The method of separation using magnets is used when one of the components is magnetic. So the heterogeneous mixture of iron filings and some other material (such as sulphur powder) can be separated by using magnets. Similarly, a mixture of sand and iron filings can be separated by magnet.
[13] The most abundant element by number in the living system is :
A.
Nitrogen
B.
Hydrogen
C.
Oxygen
D.
Carbon
Ans:
Hydrogen
Explanation :
In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water.
[14] Who discovered Potassium?
A.
Humphry Davy
B.
Alan Turing
C.
Bill Gates
D.
Tim Berners-Lee
Ans:
Humphry Davy
Explanation :
Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile.
[15] Air is -
A.
Compound
B.
Element
C.
Mixture
D.
Solution
Ans:
Mixture
Explanation :
Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
[16] What is the formula of potassium ion in the noble gas state?
A.
K⁺
B.
K²⁺
C.
K²⁻
D.
K⁻
Ans:
K⁺
Explanation :
0
[17] Bauxite is used as raw material by which industry?
A.
Aluminium
B.
Iron
C.
Steel
D.
Gold
Ans:
Aluminium
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
Bio-fertilizers are micro-organisms which bring about nutrient enrichment of soil by enhancing the availability of nutrients to crops. The micro-organisms which act as bio-fertilizers are bacteria, cyano- bacteria (blue green algae) and mycorrhizal fungi. The symbiotic nitrogen-fixing bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
[6] Radioactivity was discovered by _.
A.
J.J. Thomson
B.
W.Roentgen
C.
H.Becquerel
D.
M. Curie
Ans:
H.Becquerel
Explanation :
Antoine-Henri Becquerel is known for his discovery of radioactivity, for which he received the Nobel Prize for Physics in 1903. Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability.
[7] Which one of the following can be oxidized to the corresponding carbonyl compound -
A.
O-Nitrophenol
B.
Phenol
C.
2-methyl-2-hydroxy propane
D.
2-hydroxy propane
Ans:
2-hydroxy propane
Explanation :
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon lo make steel and has the effect of increasing the hardness and strength of iron. Pure iron cannot be hardened or strengthened by heat treatment but the addition of carbon enables a wide range of hardness and strength. High-carbon stainless steel contains a minimum of 0.3% carbon. The higher the carbon content, the less formable and the tougher the steel becomes.
[9] Which of the following is not soluble in water?
A.
Lead Sulphate
B.
Zinc sulphate
C.
Potassium sulphate
D.
Sodium sulphate
Ans:
Zinc sulphate
Explanation :
Lead sulfate (PbSO4) is a white crystalline solid. It is insoluble in water and sinks in it. It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged. It is also known as fast white, milk white, sulfuric acid lead salt or anglesite.
[10] Isotopes differ in -
A.
No. of electrons
B.
No. of protons
C.
No. of neutrons
D.
Chemical reactivity
Ans:
No. of neutrons
Explanation :
Isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons.
[11] Modern periodic law had been given by -
A.
Moseley
B.
Mendeleev
C.
Lother-Mayer
D.
Lavoisier
Ans:
Moseley
Explanation :
In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
[12] Iron filings can be separated from a heterogenous mixture using the technique of :
A.
Sublimation
B.
Magnetization
C.
Sedimentation
D.
Evaporation
Ans:
Magnetization
Explanation :
The method of separation using magnets is used when one of the components is magnetic. So the heterogeneous mixture of iron filings and some other material (such as sulphur powder) can be separated by using magnets. Similarly, a mixture of sand and iron filings can be separated by magnet.
[13] The most abundant element by number in the living system is :
A.
Nitrogen
B.
Hydrogen
C.
Oxygen
D.
Carbon
Ans:
Hydrogen
Explanation :
In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water.
[14] Who discovered Potassium?
A.
Humphry Davy
B.
Alan Turing
C.
Bill Gates
D.
Tim Berners-Lee
Ans:
Humphry Davy
Explanation :
Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile.
[15] Air is -
A.
Compound
B.
Element
C.
Mixture
D.
Solution
Ans:
Mixture
Explanation :
Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
[16] What is the formula of potassium ion in the noble gas state?
A.
K⁺
B.
K²⁺
C.
K²⁻
D.
K⁻
Ans:
K⁺
Explanation :
0
[17] Bauxite is used as raw material by which industry?
A.
Aluminium
B.
Iron
C.
Steel
D.
Gold
Ans:
Aluminium
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon lo make steel and has the effect of increasing the hardness and strength of iron. Pure iron cannot be hardened or strengthened by heat treatment but the addition of carbon enables a wide range of hardness and strength. High-carbon stainless steel contains a minimum of 0.3% carbon. The higher the carbon content, the less formable and the tougher the steel becomes.
[9] Which of the following is not soluble in water?
A.
Lead Sulphate
B.
Zinc sulphate
C.
Potassium sulphate
D.
Sodium sulphate
Ans:
Zinc sulphate
Explanation :
Lead sulfate (PbSO4) is a white crystalline solid. It is insoluble in water and sinks in it. It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged. It is also known as fast white, milk white, sulfuric acid lead salt or anglesite.
[10] Isotopes differ in -
A.
No. of electrons
B.
No. of protons
C.
No. of neutrons
D.
Chemical reactivity
Ans:
No. of neutrons
Explanation :
Isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons.
[11] Modern periodic law had been given by -
A.
Moseley
B.
Mendeleev
C.
Lother-Mayer
D.
Lavoisier
Ans:
Moseley
Explanation :
In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
[12] Iron filings can be separated from a heterogenous mixture using the technique of :
A.
Sublimation
B.
Magnetization
C.
Sedimentation
D.
Evaporation
Ans:
Magnetization
Explanation :
The method of separation using magnets is used when one of the components is magnetic. So the heterogeneous mixture of iron filings and some other material (such as sulphur powder) can be separated by using magnets. Similarly, a mixture of sand and iron filings can be separated by magnet.
[13] The most abundant element by number in the living system is :
A.
Nitrogen
B.
Hydrogen
C.
Oxygen
D.
Carbon
Ans:
Hydrogen
Explanation :
In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water.
[14] Who discovered Potassium?
A.
Humphry Davy
B.
Alan Turing
C.
Bill Gates
D.
Tim Berners-Lee
Ans:
Humphry Davy
Explanation :
Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile.
[15] Air is -
A.
Compound
B.
Element
C.
Mixture
D.
Solution
Ans:
Mixture
Explanation :
Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
[16] What is the formula of potassium ion in the noble gas state?
A.
K⁺
B.
K²⁺
C.
K²⁻
D.
K⁻
Ans:
K⁺
Explanation :
0
[17] Bauxite is used as raw material by which industry?
A.
Aluminium
B.
Iron
C.
Steel
D.
Gold
Ans:
Aluminium
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
Lead sulfate (PbSO4) is a white crystalline solid. It is insoluble in water and sinks in it. It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged. It is also known as fast white, milk white, sulfuric acid lead salt or anglesite.
[10] Isotopes differ in -
A.
No. of electrons
B.
No. of protons
C.
No. of neutrons
D.
Chemical reactivity
Ans:
No. of neutrons
Explanation :
Isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons.
[11] Modern periodic law had been given by -
A.
Moseley
B.
Mendeleev
C.
Lother-Mayer
D.
Lavoisier
Ans:
Moseley
Explanation :
In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
[12] Iron filings can be separated from a heterogenous mixture using the technique of :
A.
Sublimation
B.
Magnetization
C.
Sedimentation
D.
Evaporation
Ans:
Magnetization
Explanation :
The method of separation using magnets is used when one of the components is magnetic. So the heterogeneous mixture of iron filings and some other material (such as sulphur powder) can be separated by using magnets. Similarly, a mixture of sand and iron filings can be separated by magnet.
[13] The most abundant element by number in the living system is :
A.
Nitrogen
B.
Hydrogen
C.
Oxygen
D.
Carbon
Ans:
Hydrogen
Explanation :
In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water.
[14] Who discovered Potassium?
A.
Humphry Davy
B.
Alan Turing
C.
Bill Gates
D.
Tim Berners-Lee
Ans:
Humphry Davy
Explanation :
Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile.
[15] Air is -
A.
Compound
B.
Element
C.
Mixture
D.
Solution
Ans:
Mixture
Explanation :
Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
[16] What is the formula of potassium ion in the noble gas state?
A.
K⁺
B.
K²⁺
C.
K²⁻
D.
K⁻
Ans:
K⁺
Explanation :
0
[17] Bauxite is used as raw material by which industry?
A.
Aluminium
B.
Iron
C.
Steel
D.
Gold
Ans:
Aluminium
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
[12] Iron filings can be separated from a heterogenous mixture using the technique of :
A.
Sublimation
B.
Magnetization
C.
Sedimentation
D.
Evaporation
Ans:
Magnetization
Explanation :
The method of separation using magnets is used when one of the components is magnetic. So the heterogeneous mixture of iron filings and some other material (such as sulphur powder) can be separated by using magnets. Similarly, a mixture of sand and iron filings can be separated by magnet.
[13] The most abundant element by number in the living system is :
A.
Nitrogen
B.
Hydrogen
C.
Oxygen
D.
Carbon
Ans:
Hydrogen
Explanation :
In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water.
[14] Who discovered Potassium?
A.
Humphry Davy
B.
Alan Turing
C.
Bill Gates
D.
Tim Berners-Lee
Ans:
Humphry Davy
Explanation :
Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile.
[15] Air is -
A.
Compound
B.
Element
C.
Mixture
D.
Solution
Ans:
Mixture
Explanation :
Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
[16] What is the formula of potassium ion in the noble gas state?
A.
K⁺
B.
K²⁺
C.
K²⁻
D.
K⁻
Ans:
K⁺
Explanation :
0
[17] Bauxite is used as raw material by which industry?
A.
Aluminium
B.
Iron
C.
Steel
D.
Gold
Ans:
Aluminium
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water.
[14] Who discovered Potassium?
A.
Humphry Davy
B.
Alan Turing
C.
Bill Gates
D.
Tim Berners-Lee
Ans:
Humphry Davy
Explanation :
Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile.
[15] Air is -
A.
Compound
B.
Element
C.
Mixture
D.
Solution
Ans:
Mixture
Explanation :
Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
[16] What is the formula of potassium ion in the noble gas state?
A.
K⁺
B.
K²⁺
C.
K²⁻
D.
K⁻
Ans:
K⁺
Explanation :
0
[17] Bauxite is used as raw material by which industry?
A.
Aluminium
B.
Iron
C.
Steel
D.
Gold
Ans:
Aluminium
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
[16] What is the formula of potassium ion in the noble gas state?
A.
K⁺
B.
K²⁺
C.
K²⁻
D.
K⁻
Ans:
K⁺
Explanation :
0
[17] Bauxite is used as raw material by which industry?
A.
Aluminium
B.
Iron
C.
Steel
D.
Gold
Ans:
Aluminium
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate.
[18] The element absorbed both in cation and anion form is –
A.
Sulphur
B.
Nitrogen
C.
Calcium
D.
Phosphorus
Ans:
Nitrogen
Explanation :
Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
[19] Browning of paper in old books is caused by –
A.
frequent use
B.
lack of aeration
C.
collection of dust
D.
oxidation of cellulose
Ans:
oxidation of cellulose
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc.
[20] Which of the following is the hardest metal?
A.
Gold
B.
Iron
C.
Platinum
D.
Tungstain
Ans:
Tungstain
Explanation :
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals.
[21] Nuclear sizes are expressed in a unit named -
A.
Fermi
B.
Angstrom
C.
Newton
D.
Tesla
Ans:
Fermi
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
[22] Which one of the following is responsible for the stimulating effect of tea?
A.
Tannin
B.
Steroid
C.
Alkaloid
D.
Flavonoid
Ans:
Alkaloid
Explanation :
The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then li nked with tannin found in a tea leaf.
[23] The contact process is involved in the manufacture of -
A.
Nitric acid
B.
Sulphuric acid
C.
Ammonia
D.
Caustic soda
Ans:
Sulphuric acid
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3).
[24] Which of the following is the purest form of Carbon?
A.
Charcoal
B.
Granite
C.
Diamond
D.
Graphite
Ans:
Diamond
Explanation :
Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
[25] Brass is made of –
A.
copper and tin
B.
tin and lead
C.
copper and zinc
D.
copper, tin and zinc
Ans:
copper and zinc
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.
Explanation :
Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin.