[1] Chemically fats and oils are:
A.
Triesters
B.
Amines
C.
Aldehydes
D.
Ketons
Ans:
Triesters
Explanation :
Fats and oils are called triglycerides (or triacylcylgerols) because they are esters composed of three fatty acid units joined to glycerol, a trihydroxy alcohol. Fats and oils are composed of molecules known as triglycerides, which are esters.
[2] Atomic number of which of the following elements is greater than that of Fluorine?
A.
Sodium
B.
Beryllium
C.
Nitrogen
D.
Boron
Ans:
Sodium
Explanation :
Sodium has higher atomic number (11) than Fluorine (9) The atomic number of Beryllium and Nitrogen are 4 and 7 respectively.
[3] Which of the following is a Synthetic rubber?
A.
Leoprene
B.
Monoprene
C.
Neoprene
D.
Isoprene
Ans:
Neoprene
Explanation :
Neoprene Rubber, also known as polychloroprene or PC Rubber, is an extremely versatile synthetic rubber offering oil, petroleum and weathering resistance.
[4] Washing soda is the common name of-
A.
Calcium Carbonate
B.
Calcium Bi-Carbonate
C.
Sodium Carbonate
D.
Sodium Bi-Carbonate
Ans:
Sodium Carbonate
Explanation :
Washing soda, sodium carbonate decahydrate, efflorescent crystals used for washing, especially textiles. It is a compound of sodium (q.v.).
[5] Which one of the following is known as the 'brown coal'?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 35%, a high inherent moisture content sometimes as high as 66%, and an ash content ranging from 6% to 19% compared with 6% to 12% for bituminous coal.
[6] Maximum permissible concentration of copper in drinking water in mg/L, is –
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
The 1959 WHO International Standards for Drinking Water suggested that concentrations of copper greater than 1.5 mg/litre would markedly impair the potability of the water. However, in the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
[7] Oxygen has (+) oxidation number only in –
A.
OF2
B.
Cl2O
C.
H2O
D.
N2O
Ans:
OF2
Explanation :
In case of F2O, oxygen is not the most electronegative element. The fluorine is more electronegative and has an oxidation state of -1. In this case, the oxygen has an oxidation state of +2.
[8] Which one of the following elements is used in the manufacture of fertilizers?
A.
Fluorine
B.
Potassium
C.
Lead
D.
Aluminium
Ans:
Potassium
Explanation :
Nitrogen, phosphorus and potassium are the three most common bases of fertilizers. Potash can be used to make potassium (K) fertilizers. All commercial potash deposits come originally from marine deposits and are often buried deep in the earth.
[9] Select the one which is not a mixture –
A.
Air
B.
Gasoline
C.
LPG
D.
Distilled water
Ans:
Distilled water
Explanation :
Water (H2O) is the most abundant compound on Earth's surface. Water is a compound because it contains oxygen and hydrogen which are chemically combined in proportion.
[10] When Hydrogen starts burning in air, it produces?
A.
Ammonia
B.
Water
C.
Methane
D.
Carbonic Acid
Ans:
Water
Explanation :
Hydrogen burns in oxygen or air to form water. 2H2 + O2 = 2H2O
[11] Carbon occurs in nature in the purest form as -
A.
Diamond
B.
Graphite
C.
Carbon black
D.
Coal
Ans:
Diamond
Explanation :
There are three forms of pure carbon: Graphite, Coal and Diamond. All three are made up of elemental carbon, caol is the least pure when found in nature. Diamond is the purest form of Carbon.
[12] In an oxygen molecule, two atoms are united by -
A.
one bond
B.
two bonds
C.
three bonds
D.
four bonds
Ans:
two bonds
Explanation :
Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.
[13] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is –
A.
Neon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen.
[14] Rectified spirit is :
A.
95% ethyl alcohol
B.
100% ethyl alcohol
C.
methylated spirit
D.
tincture iodine
Ans:
95% ethyl alcohol
Explanation :
Rectified spirit, also known as ethyl alcohol of agricultural origin, is highly concentrated ethanol which has been purified by means of repeated distillation, called rectification. It typically contains 95% alcohol by volume.
[15] Nylon is made up of :
A.
Polyamide
B.
Polyester
C.
Polyethylene
D.
Polypropylene
Ans:
Polyamide
Explanation :
Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
[16] Which is a natural colloid?
A.
Sodium chloride
B.
Urea
C.
Cane-sugar
D.
Blood
Ans:
Blood
Explanation :
Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues.
[17] Which one of the following does not contain Silver?
A.
Ruby Silver
B.
Lunar Caustic
C.
German Silver
D.
Horn Silver
Ans:
German Silver
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
Fats and oils are called triglycerides (or triacylcylgerols) because they are esters composed of three fatty acid units joined to glycerol, a trihydroxy alcohol. Fats and oils are composed of molecules known as triglycerides, which are esters.
[2] Atomic number of which of the following elements is greater than that of Fluorine?
A.
Sodium
B.
Beryllium
C.
Nitrogen
D.
Boron
Ans:
Sodium
Explanation :
Sodium has higher atomic number (11) than Fluorine (9) The atomic number of Beryllium and Nitrogen are 4 and 7 respectively.
[3] Which of the following is a Synthetic rubber?
A.
Leoprene
B.
Monoprene
C.
Neoprene
D.
Isoprene
Ans:
Neoprene
Explanation :
Neoprene Rubber, also known as polychloroprene or PC Rubber, is an extremely versatile synthetic rubber offering oil, petroleum and weathering resistance.
[4] Washing soda is the common name of-
A.
Calcium Carbonate
B.
Calcium Bi-Carbonate
C.
Sodium Carbonate
D.
Sodium Bi-Carbonate
Ans:
Sodium Carbonate
Explanation :
Washing soda, sodium carbonate decahydrate, efflorescent crystals used for washing, especially textiles. It is a compound of sodium (q.v.).
[5] Which one of the following is known as the 'brown coal'?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 35%, a high inherent moisture content sometimes as high as 66%, and an ash content ranging from 6% to 19% compared with 6% to 12% for bituminous coal.
[6] Maximum permissible concentration of copper in drinking water in mg/L, is –
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
The 1959 WHO International Standards for Drinking Water suggested that concentrations of copper greater than 1.5 mg/litre would markedly impair the potability of the water. However, in the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
[7] Oxygen has (+) oxidation number only in –
A.
OF2
B.
Cl2O
C.
H2O
D.
N2O
Ans:
OF2
Explanation :
In case of F2O, oxygen is not the most electronegative element. The fluorine is more electronegative and has an oxidation state of -1. In this case, the oxygen has an oxidation state of +2.
[8] Which one of the following elements is used in the manufacture of fertilizers?
A.
Fluorine
B.
Potassium
C.
Lead
D.
Aluminium
Ans:
Potassium
Explanation :
Nitrogen, phosphorus and potassium are the three most common bases of fertilizers. Potash can be used to make potassium (K) fertilizers. All commercial potash deposits come originally from marine deposits and are often buried deep in the earth.
[9] Select the one which is not a mixture –
A.
Air
B.
Gasoline
C.
LPG
D.
Distilled water
Ans:
Distilled water
Explanation :
Water (H2O) is the most abundant compound on Earth's surface. Water is a compound because it contains oxygen and hydrogen which are chemically combined in proportion.
[10] When Hydrogen starts burning in air, it produces?
A.
Ammonia
B.
Water
C.
Methane
D.
Carbonic Acid
Ans:
Water
Explanation :
Hydrogen burns in oxygen or air to form water. 2H2 + O2 = 2H2O
[11] Carbon occurs in nature in the purest form as -
A.
Diamond
B.
Graphite
C.
Carbon black
D.
Coal
Ans:
Diamond
Explanation :
There are three forms of pure carbon: Graphite, Coal and Diamond. All three are made up of elemental carbon, caol is the least pure when found in nature. Diamond is the purest form of Carbon.
[12] In an oxygen molecule, two atoms are united by -
A.
one bond
B.
two bonds
C.
three bonds
D.
four bonds
Ans:
two bonds
Explanation :
Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.
[13] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is –
A.
Neon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen.
[14] Rectified spirit is :
A.
95% ethyl alcohol
B.
100% ethyl alcohol
C.
methylated spirit
D.
tincture iodine
Ans:
95% ethyl alcohol
Explanation :
Rectified spirit, also known as ethyl alcohol of agricultural origin, is highly concentrated ethanol which has been purified by means of repeated distillation, called rectification. It typically contains 95% alcohol by volume.
[15] Nylon is made up of :
A.
Polyamide
B.
Polyester
C.
Polyethylene
D.
Polypropylene
Ans:
Polyamide
Explanation :
Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
[16] Which is a natural colloid?
A.
Sodium chloride
B.
Urea
C.
Cane-sugar
D.
Blood
Ans:
Blood
Explanation :
Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues.
[17] Which one of the following does not contain Silver?
A.
Ruby Silver
B.
Lunar Caustic
C.
German Silver
D.
Horn Silver
Ans:
German Silver
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
Neoprene Rubber, also known as polychloroprene or PC Rubber, is an extremely versatile synthetic rubber offering oil, petroleum and weathering resistance.
[4] Washing soda is the common name of-
A.
Calcium Carbonate
B.
Calcium Bi-Carbonate
C.
Sodium Carbonate
D.
Sodium Bi-Carbonate
Ans:
Sodium Carbonate
Explanation :
Washing soda, sodium carbonate decahydrate, efflorescent crystals used for washing, especially textiles. It is a compound of sodium (q.v.).
[5] Which one of the following is known as the 'brown coal'?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 35%, a high inherent moisture content sometimes as high as 66%, and an ash content ranging from 6% to 19% compared with 6% to 12% for bituminous coal.
[6] Maximum permissible concentration of copper in drinking water in mg/L, is –
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
The 1959 WHO International Standards for Drinking Water suggested that concentrations of copper greater than 1.5 mg/litre would markedly impair the potability of the water. However, in the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
[7] Oxygen has (+) oxidation number only in –
A.
OF2
B.
Cl2O
C.
H2O
D.
N2O
Ans:
OF2
Explanation :
In case of F2O, oxygen is not the most electronegative element. The fluorine is more electronegative and has an oxidation state of -1. In this case, the oxygen has an oxidation state of +2.
[8] Which one of the following elements is used in the manufacture of fertilizers?
A.
Fluorine
B.
Potassium
C.
Lead
D.
Aluminium
Ans:
Potassium
Explanation :
Nitrogen, phosphorus and potassium are the three most common bases of fertilizers. Potash can be used to make potassium (K) fertilizers. All commercial potash deposits come originally from marine deposits and are often buried deep in the earth.
[9] Select the one which is not a mixture –
A.
Air
B.
Gasoline
C.
LPG
D.
Distilled water
Ans:
Distilled water
Explanation :
Water (H2O) is the most abundant compound on Earth's surface. Water is a compound because it contains oxygen and hydrogen which are chemically combined in proportion.
[10] When Hydrogen starts burning in air, it produces?
A.
Ammonia
B.
Water
C.
Methane
D.
Carbonic Acid
Ans:
Water
Explanation :
Hydrogen burns in oxygen or air to form water. 2H2 + O2 = 2H2O
[11] Carbon occurs in nature in the purest form as -
A.
Diamond
B.
Graphite
C.
Carbon black
D.
Coal
Ans:
Diamond
Explanation :
There are three forms of pure carbon: Graphite, Coal and Diamond. All three are made up of elemental carbon, caol is the least pure when found in nature. Diamond is the purest form of Carbon.
[12] In an oxygen molecule, two atoms are united by -
A.
one bond
B.
two bonds
C.
three bonds
D.
four bonds
Ans:
two bonds
Explanation :
Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.
[13] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is –
A.
Neon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen.
[14] Rectified spirit is :
A.
95% ethyl alcohol
B.
100% ethyl alcohol
C.
methylated spirit
D.
tincture iodine
Ans:
95% ethyl alcohol
Explanation :
Rectified spirit, also known as ethyl alcohol of agricultural origin, is highly concentrated ethanol which has been purified by means of repeated distillation, called rectification. It typically contains 95% alcohol by volume.
[15] Nylon is made up of :
A.
Polyamide
B.
Polyester
C.
Polyethylene
D.
Polypropylene
Ans:
Polyamide
Explanation :
Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
[16] Which is a natural colloid?
A.
Sodium chloride
B.
Urea
C.
Cane-sugar
D.
Blood
Ans:
Blood
Explanation :
Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues.
[17] Which one of the following does not contain Silver?
A.
Ruby Silver
B.
Lunar Caustic
C.
German Silver
D.
Horn Silver
Ans:
German Silver
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 35%, a high inherent moisture content sometimes as high as 66%, and an ash content ranging from 6% to 19% compared with 6% to 12% for bituminous coal.
[6] Maximum permissible concentration of copper in drinking water in mg/L, is –
A.
0.01
B.
0.05
C.
1
D.
2
Ans:
1
Explanation :
The 1959 WHO International Standards for Drinking Water suggested that concentrations of copper greater than 1.5 mg/litre would markedly impair the potability of the water. However, in the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties.
[7] Oxygen has (+) oxidation number only in –
A.
OF2
B.
Cl2O
C.
H2O
D.
N2O
Ans:
OF2
Explanation :
In case of F2O, oxygen is not the most electronegative element. The fluorine is more electronegative and has an oxidation state of -1. In this case, the oxygen has an oxidation state of +2.
[8] Which one of the following elements is used in the manufacture of fertilizers?
A.
Fluorine
B.
Potassium
C.
Lead
D.
Aluminium
Ans:
Potassium
Explanation :
Nitrogen, phosphorus and potassium are the three most common bases of fertilizers. Potash can be used to make potassium (K) fertilizers. All commercial potash deposits come originally from marine deposits and are often buried deep in the earth.
[9] Select the one which is not a mixture –
A.
Air
B.
Gasoline
C.
LPG
D.
Distilled water
Ans:
Distilled water
Explanation :
Water (H2O) is the most abundant compound on Earth's surface. Water is a compound because it contains oxygen and hydrogen which are chemically combined in proportion.
[10] When Hydrogen starts burning in air, it produces?
A.
Ammonia
B.
Water
C.
Methane
D.
Carbonic Acid
Ans:
Water
Explanation :
Hydrogen burns in oxygen or air to form water. 2H2 + O2 = 2H2O
[11] Carbon occurs in nature in the purest form as -
A.
Diamond
B.
Graphite
C.
Carbon black
D.
Coal
Ans:
Diamond
Explanation :
There are three forms of pure carbon: Graphite, Coal and Diamond. All three are made up of elemental carbon, caol is the least pure when found in nature. Diamond is the purest form of Carbon.
[12] In an oxygen molecule, two atoms are united by -
A.
one bond
B.
two bonds
C.
three bonds
D.
four bonds
Ans:
two bonds
Explanation :
Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.
[13] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is –
A.
Neon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen.
[14] Rectified spirit is :
A.
95% ethyl alcohol
B.
100% ethyl alcohol
C.
methylated spirit
D.
tincture iodine
Ans:
95% ethyl alcohol
Explanation :
Rectified spirit, also known as ethyl alcohol of agricultural origin, is highly concentrated ethanol which has been purified by means of repeated distillation, called rectification. It typically contains 95% alcohol by volume.
[15] Nylon is made up of :
A.
Polyamide
B.
Polyester
C.
Polyethylene
D.
Polypropylene
Ans:
Polyamide
Explanation :
Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
[16] Which is a natural colloid?
A.
Sodium chloride
B.
Urea
C.
Cane-sugar
D.
Blood
Ans:
Blood
Explanation :
Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues.
[17] Which one of the following does not contain Silver?
A.
Ruby Silver
B.
Lunar Caustic
C.
German Silver
D.
Horn Silver
Ans:
German Silver
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
In case of F2O, oxygen is not the most electronegative element. The fluorine is more electronegative and has an oxidation state of -1. In this case, the oxygen has an oxidation state of +2.
[8] Which one of the following elements is used in the manufacture of fertilizers?
A.
Fluorine
B.
Potassium
C.
Lead
D.
Aluminium
Ans:
Potassium
Explanation :
Nitrogen, phosphorus and potassium are the three most common bases of fertilizers. Potash can be used to make potassium (K) fertilizers. All commercial potash deposits come originally from marine deposits and are often buried deep in the earth.
[9] Select the one which is not a mixture –
A.
Air
B.
Gasoline
C.
LPG
D.
Distilled water
Ans:
Distilled water
Explanation :
Water (H2O) is the most abundant compound on Earth's surface. Water is a compound because it contains oxygen and hydrogen which are chemically combined in proportion.
[10] When Hydrogen starts burning in air, it produces?
A.
Ammonia
B.
Water
C.
Methane
D.
Carbonic Acid
Ans:
Water
Explanation :
Hydrogen burns in oxygen or air to form water. 2H2 + O2 = 2H2O
[11] Carbon occurs in nature in the purest form as -
A.
Diamond
B.
Graphite
C.
Carbon black
D.
Coal
Ans:
Diamond
Explanation :
There are three forms of pure carbon: Graphite, Coal and Diamond. All three are made up of elemental carbon, caol is the least pure when found in nature. Diamond is the purest form of Carbon.
[12] In an oxygen molecule, two atoms are united by -
A.
one bond
B.
two bonds
C.
three bonds
D.
four bonds
Ans:
two bonds
Explanation :
Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.
[13] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is –
A.
Neon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen.
[14] Rectified spirit is :
A.
95% ethyl alcohol
B.
100% ethyl alcohol
C.
methylated spirit
D.
tincture iodine
Ans:
95% ethyl alcohol
Explanation :
Rectified spirit, also known as ethyl alcohol of agricultural origin, is highly concentrated ethanol which has been purified by means of repeated distillation, called rectification. It typically contains 95% alcohol by volume.
[15] Nylon is made up of :
A.
Polyamide
B.
Polyester
C.
Polyethylene
D.
Polypropylene
Ans:
Polyamide
Explanation :
Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
[16] Which is a natural colloid?
A.
Sodium chloride
B.
Urea
C.
Cane-sugar
D.
Blood
Ans:
Blood
Explanation :
Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues.
[17] Which one of the following does not contain Silver?
A.
Ruby Silver
B.
Lunar Caustic
C.
German Silver
D.
Horn Silver
Ans:
German Silver
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
Water (H2O) is the most abundant compound on Earth's surface. Water is a compound because it contains oxygen and hydrogen which are chemically combined in proportion.
[10] When Hydrogen starts burning in air, it produces?
A.
Ammonia
B.
Water
C.
Methane
D.
Carbonic Acid
Ans:
Water
Explanation :
Hydrogen burns in oxygen or air to form water. 2H2 + O2 = 2H2O
[11] Carbon occurs in nature in the purest form as -
A.
Diamond
B.
Graphite
C.
Carbon black
D.
Coal
Ans:
Diamond
Explanation :
There are three forms of pure carbon: Graphite, Coal and Diamond. All three are made up of elemental carbon, caol is the least pure when found in nature. Diamond is the purest form of Carbon.
[12] In an oxygen molecule, two atoms are united by -
A.
one bond
B.
two bonds
C.
three bonds
D.
four bonds
Ans:
two bonds
Explanation :
Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.
[13] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is –
A.
Neon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen.
[14] Rectified spirit is :
A.
95% ethyl alcohol
B.
100% ethyl alcohol
C.
methylated spirit
D.
tincture iodine
Ans:
95% ethyl alcohol
Explanation :
Rectified spirit, also known as ethyl alcohol of agricultural origin, is highly concentrated ethanol which has been purified by means of repeated distillation, called rectification. It typically contains 95% alcohol by volume.
[15] Nylon is made up of :
A.
Polyamide
B.
Polyester
C.
Polyethylene
D.
Polypropylene
Ans:
Polyamide
Explanation :
Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
[16] Which is a natural colloid?
A.
Sodium chloride
B.
Urea
C.
Cane-sugar
D.
Blood
Ans:
Blood
Explanation :
Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues.
[17] Which one of the following does not contain Silver?
A.
Ruby Silver
B.
Lunar Caustic
C.
German Silver
D.
Horn Silver
Ans:
German Silver
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
There are three forms of pure carbon: Graphite, Coal and Diamond. All three are made up of elemental carbon, caol is the least pure when found in nature. Diamond is the purest form of Carbon.
[12] In an oxygen molecule, two atoms are united by -
A.
one bond
B.
two bonds
C.
three bonds
D.
four bonds
Ans:
two bonds
Explanation :
Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.
[13] The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is –
A.
Neon
B.
Krypton
C.
Argon
D.
Helium
Ans:
Helium
Explanation :
Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen.
[14] Rectified spirit is :
A.
95% ethyl alcohol
B.
100% ethyl alcohol
C.
methylated spirit
D.
tincture iodine
Ans:
95% ethyl alcohol
Explanation :
Rectified spirit, also known as ethyl alcohol of agricultural origin, is highly concentrated ethanol which has been purified by means of repeated distillation, called rectification. It typically contains 95% alcohol by volume.
[15] Nylon is made up of :
A.
Polyamide
B.
Polyester
C.
Polyethylene
D.
Polypropylene
Ans:
Polyamide
Explanation :
Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
[16] Which is a natural colloid?
A.
Sodium chloride
B.
Urea
C.
Cane-sugar
D.
Blood
Ans:
Blood
Explanation :
Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues.
[17] Which one of the following does not contain Silver?
A.
Ruby Silver
B.
Lunar Caustic
C.
German Silver
D.
Horn Silver
Ans:
German Silver
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen.
[14] Rectified spirit is :
A.
95% ethyl alcohol
B.
100% ethyl alcohol
C.
methylated spirit
D.
tincture iodine
Ans:
95% ethyl alcohol
Explanation :
Rectified spirit, also known as ethyl alcohol of agricultural origin, is highly concentrated ethanol which has been purified by means of repeated distillation, called rectification. It typically contains 95% alcohol by volume.
[15] Nylon is made up of :
A.
Polyamide
B.
Polyester
C.
Polyethylene
D.
Polypropylene
Ans:
Polyamide
Explanation :
Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
[16] Which is a natural colloid?
A.
Sodium chloride
B.
Urea
C.
Cane-sugar
D.
Blood
Ans:
Blood
Explanation :
Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues.
[17] Which one of the following does not contain Silver?
A.
Ruby Silver
B.
Lunar Caustic
C.
German Silver
D.
Horn Silver
Ans:
German Silver
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
[16] Which is a natural colloid?
A.
Sodium chloride
B.
Urea
C.
Cane-sugar
D.
Blood
Ans:
Blood
Explanation :
Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues.
[17] Which one of the following does not contain Silver?
A.
Ruby Silver
B.
Lunar Caustic
C.
German Silver
D.
Horn Silver
Ans:
German Silver
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
[18] Which of the following auto mobile gases is not considered to be an air pollutant?
A.
Carbon dioxide
B.
Carbon monoxide
C.
Sulfur dioxide
D.
Nitrogen dioxide
Ans:
Carbon dioxide
Explanation :
There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.
[19] Which of the following is an essential element used in the synthesis of proteins and other compounds?
A.
Phosphorus
B.
Iron
C.
Magnesium
D.
Nitrogen
Ans:
Nitrogen
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
[20] Stilton is a –
A.
Semiconductor
B.
Insulator
C.
Nonconductor
D.
Conductor
Ans:
Semiconductor
Explanation :
Silicon is a chemical element with the symbol Si and its atomic number is 14. Over 90 percent of the Earth's crust is composed of silicate minerals. Highly purified silicon is used in semiconductor electronics.
[21] The orientation of an atomic orbital is governed by –
A.
principal quantum number
B.
magnetic quantum number
C.
spin quantum number
D.
azimuthal quantum number
Ans:
magnetic quantum number
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.
[22] Maximum permissible concentration of total hardness in drinking water is –
A.
50
B.
100
C.
200
D.
500
Ans:
200
Explanation :
Maximum permissible concentration of total hardness in drinking water in 200.
[23] Electric fuse is an alloy of –
A.
tin and lead
B.
zinc and lead
C.
copper and iron
D.
carbon and tin
Ans:
tin and lead
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[24] Which of the following is the major constituent of LPG?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
Ans:
Butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquefied petroleum gas.
[25] Ozone layer is present in -
A.
Troposphere
B.
Ionosphere
C.
Stratosphere
D.
Exosphere
Ans:
Stratosphere
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.
Explanation :
The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and geographically. Generally, it is smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn in the northern hemisphere.