[1] J.J. Thomson’s proposed model of action is generally called model.
A.
Cream and cake
B.
Plum and pudding
C.
(4) Plum and cake
D.
Cream and pudding
Ans:
Plum and pudding
Explanation :
The plum pudding model, one of several scientific models of the atom, was first proposed by J. J. Thomson in 1904 soon after the discovery of the electron, but before the discovery of the atomic nucleus. In this model, atoms were known to consist of negatively charged electrons. The model represented an attempt to consolidate the known properties of atoms at the time.
[2] Even after sunset, the air near the Earth's surface continue to receive heat due to –
A.
Insolation
B.
Terrestrial Radiation
C.
Conduction
D.
Convection
Ans:
Terrestrial Radiation
Explanation :
Even after the sunset when the sun goes down, the incoming radiation from the sun stops, but there is still a lot of radiation that has been absorbed by the earth, which is reradiated in form of terrestrial radiation Energy leaving the earth's surface i.e. terrestrial radiation heats up the atmosphere more than the incoming solar radiation i.e. insolation
[3] Trinitrotoluene is –
A.
used to melt metals
B.
used to fuse two metals
C.
used as an abrasive
D.
used as an explosive
Ans:
used as an explosive
Explanation :
Trinitrotoluene (C6H2 (NO2)3.CH3), abbreviated as TNT, is sometimes used as a reagent in chemical synthesis, but it is best known as an explosive material with convenient handling properties. The explosive yield of TNT is considered to be the standard mea-sure of bombs and other explosives.
[4] Which one of the following polymers is widely used for making bullet proof material?
A.
Polyvinyl chloride
B.
Polyamides
C.
Polyethylene
D.
Polycarbonates
Ans:
Polycarbonates
Explanation :
Ballistic nylon was the standard cloth used for bulletproof vests until the 1970s. In 1965, Stephanie Kwolek, a chemist at Du Pont, invented Kevlar, trademark for poly-para-phenylene terephthalamide, a liquid polymer that can be spun into aramid fiber and woven into cloth.
[5] The high reactivity of fluorine is due to -
A.
small size of fluorine atom
B.
its high electro negativity
C.
availability of d-orbitals
D.
strong F - F bond
Ans:
its high electro negativity
Explanation :
The high reactivity of fluorine is due to its high electro negativity.
[6] Which of the following is not an example of a biomass energy source?
A.
Wood
B.
Ethanol
C.
Cow dung
D.
Atomic energy
Ans:
Atomic energy
Explanation :
The organic matter within the plants, the agriculture crops, and material related with the plants directly or in directly are called as the biomass.
[7] Which of the following has the highest bond order?
A.
N2
B.
O2
C.
Cl2
D.
H2
Ans:
N2
Explanation :
A high bond order indicates more attraction between electrons. A higher bond order also means that the atoms are held together more tightly.
[8] is used for making vinegar.
A.
Tartaric acid
B.
Mahe acid
C.
Oxalic acid
D.
Acetic acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COON) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[9] Major portion of the earth's crust is mainly constituted by –
A.
Oxygen and Iron
B.
Oxygen and Silicon
C.
Silicon and Iron
D.
Silicon and Aluminium
Ans:
Oxygen and Silicon
Explanation :
Oxygen is the most abundant element in the earth's crust, comprising 46.6% or the crust by weight. Silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61% also comprise the crust. Given the abundance of oxygen and silicon, the silicates are the most abundant minerals in the earth's crust.
[10] Cinnabar is an ore/mineral of –
A.
Lead
B.
Manganese
C.
Molybdenum
D.
Mercu
Ans:
Mercu
Explanation :
Cinnabarrefers to the common bright scarlet to brick red form of mercuryasullide (HgS) that is the most common source ore for refining elemental mercury. It is the historic source for the brilliant red or scarlet pigment termed vermilion and associated red mercury pigments.
[11] Which among the following is not a characteristic of transition metals?
A.
Tendency to gain electrons
B.
Low electronegativity
C.
Low ionization energy
D.
Malleability
Ans:
Tendency to gain electrons
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal enemy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable slate. When these metals form ions, the 4s electrons are always lost first; so, they form only cations (positive ions).
[12] Human nails are made up of -
A.
Pigment
B.
Elastin
C.
Albumin
D.
Keratin
Ans:
Keratin
Explanation :
Keratin, a family of fibrous structural proteins, is the key structural component of hair and nails.
[13] Meson particles are found in-
A.
R-rays
B.
X-rays
C.
Laser beam
D.
Cosmic rays
Ans:
Cosmic rays
Explanation :
Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behavior of their constituent quarks.
[14] Nitric acid does not react with -
A.
Gold
B.
Copper
C.
Zinc
D.
Iron
Ans:
Gold
Explanation :
Concentrated nitric acid is a very strong oxidator capable of reacting with the noble metals such as copper or silver. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid. However, pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid.
[15] The process of dissolving an acid or a base in water is a highly -
A.
Exothermic reaction
B.
Endothermic reaction
C.
Sublimation reaction
D.
Redux reaction
Ans:
Exothermic reaction
Explanation :
The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
[16] Atomic number is equal to -
A.
Number of electrons
B.
Number of neutron
C.
Number of protons
D.
Total number of protons and neutrons
Ans:
Number of protons
Explanation :
Atomic number is equal to Number of protons. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom.
[17] Which of the following does the Nucleus of an atom consist of?
A.
Protons and neutrons
B.
Protons and electrons
C.
Electrons
D.
Protons
Ans:
Protons and neutrons
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
The plum pudding model, one of several scientific models of the atom, was first proposed by J. J. Thomson in 1904 soon after the discovery of the electron, but before the discovery of the atomic nucleus. In this model, atoms were known to consist of negatively charged electrons. The model represented an attempt to consolidate the known properties of atoms at the time.
[2] Even after sunset, the air near the Earth's surface continue to receive heat due to –
A.
Insolation
B.
Terrestrial Radiation
C.
Conduction
D.
Convection
Ans:
Terrestrial Radiation
Explanation :
Even after the sunset when the sun goes down, the incoming radiation from the sun stops, but there is still a lot of radiation that has been absorbed by the earth, which is reradiated in form of terrestrial radiation Energy leaving the earth's surface i.e. terrestrial radiation heats up the atmosphere more than the incoming solar radiation i.e. insolation
[3] Trinitrotoluene is –
A.
used to melt metals
B.
used to fuse two metals
C.
used as an abrasive
D.
used as an explosive
Ans:
used as an explosive
Explanation :
Trinitrotoluene (C6H2 (NO2)3.CH3), abbreviated as TNT, is sometimes used as a reagent in chemical synthesis, but it is best known as an explosive material with convenient handling properties. The explosive yield of TNT is considered to be the standard mea-sure of bombs and other explosives.
[4] Which one of the following polymers is widely used for making bullet proof material?
A.
Polyvinyl chloride
B.
Polyamides
C.
Polyethylene
D.
Polycarbonates
Ans:
Polycarbonates
Explanation :
Ballistic nylon was the standard cloth used for bulletproof vests until the 1970s. In 1965, Stephanie Kwolek, a chemist at Du Pont, invented Kevlar, trademark for poly-para-phenylene terephthalamide, a liquid polymer that can be spun into aramid fiber and woven into cloth.
[5] The high reactivity of fluorine is due to -
A.
small size of fluorine atom
B.
its high electro negativity
C.
availability of d-orbitals
D.
strong F - F bond
Ans:
its high electro negativity
Explanation :
The high reactivity of fluorine is due to its high electro negativity.
[6] Which of the following is not an example of a biomass energy source?
A.
Wood
B.
Ethanol
C.
Cow dung
D.
Atomic energy
Ans:
Atomic energy
Explanation :
The organic matter within the plants, the agriculture crops, and material related with the plants directly or in directly are called as the biomass.
[7] Which of the following has the highest bond order?
A.
N2
B.
O2
C.
Cl2
D.
H2
Ans:
N2
Explanation :
A high bond order indicates more attraction between electrons. A higher bond order also means that the atoms are held together more tightly.
[8] is used for making vinegar.
A.
Tartaric acid
B.
Mahe acid
C.
Oxalic acid
D.
Acetic acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COON) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[9] Major portion of the earth's crust is mainly constituted by –
A.
Oxygen and Iron
B.
Oxygen and Silicon
C.
Silicon and Iron
D.
Silicon and Aluminium
Ans:
Oxygen and Silicon
Explanation :
Oxygen is the most abundant element in the earth's crust, comprising 46.6% or the crust by weight. Silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61% also comprise the crust. Given the abundance of oxygen and silicon, the silicates are the most abundant minerals in the earth's crust.
[10] Cinnabar is an ore/mineral of –
A.
Lead
B.
Manganese
C.
Molybdenum
D.
Mercu
Ans:
Mercu
Explanation :
Cinnabarrefers to the common bright scarlet to brick red form of mercuryasullide (HgS) that is the most common source ore for refining elemental mercury. It is the historic source for the brilliant red or scarlet pigment termed vermilion and associated red mercury pigments.
[11] Which among the following is not a characteristic of transition metals?
A.
Tendency to gain electrons
B.
Low electronegativity
C.
Low ionization energy
D.
Malleability
Ans:
Tendency to gain electrons
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal enemy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable slate. When these metals form ions, the 4s electrons are always lost first; so, they form only cations (positive ions).
[12] Human nails are made up of -
A.
Pigment
B.
Elastin
C.
Albumin
D.
Keratin
Ans:
Keratin
Explanation :
Keratin, a family of fibrous structural proteins, is the key structural component of hair and nails.
[13] Meson particles are found in-
A.
R-rays
B.
X-rays
C.
Laser beam
D.
Cosmic rays
Ans:
Cosmic rays
Explanation :
Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behavior of their constituent quarks.
[14] Nitric acid does not react with -
A.
Gold
B.
Copper
C.
Zinc
D.
Iron
Ans:
Gold
Explanation :
Concentrated nitric acid is a very strong oxidator capable of reacting with the noble metals such as copper or silver. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid. However, pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid.
[15] The process of dissolving an acid or a base in water is a highly -
A.
Exothermic reaction
B.
Endothermic reaction
C.
Sublimation reaction
D.
Redux reaction
Ans:
Exothermic reaction
Explanation :
The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
[16] Atomic number is equal to -
A.
Number of electrons
B.
Number of neutron
C.
Number of protons
D.
Total number of protons and neutrons
Ans:
Number of protons
Explanation :
Atomic number is equal to Number of protons. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom.
[17] Which of the following does the Nucleus of an atom consist of?
A.
Protons and neutrons
B.
Protons and electrons
C.
Electrons
D.
Protons
Ans:
Protons and neutrons
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
Trinitrotoluene (C6H2 (NO2)3.CH3), abbreviated as TNT, is sometimes used as a reagent in chemical synthesis, but it is best known as an explosive material with convenient handling properties. The explosive yield of TNT is considered to be the standard mea-sure of bombs and other explosives.
[4] Which one of the following polymers is widely used for making bullet proof material?
A.
Polyvinyl chloride
B.
Polyamides
C.
Polyethylene
D.
Polycarbonates
Ans:
Polycarbonates
Explanation :
Ballistic nylon was the standard cloth used for bulletproof vests until the 1970s. In 1965, Stephanie Kwolek, a chemist at Du Pont, invented Kevlar, trademark for poly-para-phenylene terephthalamide, a liquid polymer that can be spun into aramid fiber and woven into cloth.
[5] The high reactivity of fluorine is due to -
A.
small size of fluorine atom
B.
its high electro negativity
C.
availability of d-orbitals
D.
strong F - F bond
Ans:
its high electro negativity
Explanation :
The high reactivity of fluorine is due to its high electro negativity.
[6] Which of the following is not an example of a biomass energy source?
A.
Wood
B.
Ethanol
C.
Cow dung
D.
Atomic energy
Ans:
Atomic energy
Explanation :
The organic matter within the plants, the agriculture crops, and material related with the plants directly or in directly are called as the biomass.
[7] Which of the following has the highest bond order?
A.
N2
B.
O2
C.
Cl2
D.
H2
Ans:
N2
Explanation :
A high bond order indicates more attraction between electrons. A higher bond order also means that the atoms are held together more tightly.
[8] is used for making vinegar.
A.
Tartaric acid
B.
Mahe acid
C.
Oxalic acid
D.
Acetic acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COON) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[9] Major portion of the earth's crust is mainly constituted by –
A.
Oxygen and Iron
B.
Oxygen and Silicon
C.
Silicon and Iron
D.
Silicon and Aluminium
Ans:
Oxygen and Silicon
Explanation :
Oxygen is the most abundant element in the earth's crust, comprising 46.6% or the crust by weight. Silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61% also comprise the crust. Given the abundance of oxygen and silicon, the silicates are the most abundant minerals in the earth's crust.
[10] Cinnabar is an ore/mineral of –
A.
Lead
B.
Manganese
C.
Molybdenum
D.
Mercu
Ans:
Mercu
Explanation :
Cinnabarrefers to the common bright scarlet to brick red form of mercuryasullide (HgS) that is the most common source ore for refining elemental mercury. It is the historic source for the brilliant red or scarlet pigment termed vermilion and associated red mercury pigments.
[11] Which among the following is not a characteristic of transition metals?
A.
Tendency to gain electrons
B.
Low electronegativity
C.
Low ionization energy
D.
Malleability
Ans:
Tendency to gain electrons
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal enemy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable slate. When these metals form ions, the 4s electrons are always lost first; so, they form only cations (positive ions).
[12] Human nails are made up of -
A.
Pigment
B.
Elastin
C.
Albumin
D.
Keratin
Ans:
Keratin
Explanation :
Keratin, a family of fibrous structural proteins, is the key structural component of hair and nails.
[13] Meson particles are found in-
A.
R-rays
B.
X-rays
C.
Laser beam
D.
Cosmic rays
Ans:
Cosmic rays
Explanation :
Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behavior of their constituent quarks.
[14] Nitric acid does not react with -
A.
Gold
B.
Copper
C.
Zinc
D.
Iron
Ans:
Gold
Explanation :
Concentrated nitric acid is a very strong oxidator capable of reacting with the noble metals such as copper or silver. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid. However, pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid.
[15] The process of dissolving an acid or a base in water is a highly -
A.
Exothermic reaction
B.
Endothermic reaction
C.
Sublimation reaction
D.
Redux reaction
Ans:
Exothermic reaction
Explanation :
The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
[16] Atomic number is equal to -
A.
Number of electrons
B.
Number of neutron
C.
Number of protons
D.
Total number of protons and neutrons
Ans:
Number of protons
Explanation :
Atomic number is equal to Number of protons. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom.
[17] Which of the following does the Nucleus of an atom consist of?
A.
Protons and neutrons
B.
Protons and electrons
C.
Electrons
D.
Protons
Ans:
Protons and neutrons
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
The high reactivity of fluorine is due to its high electro negativity.
[6] Which of the following is not an example of a biomass energy source?
A.
Wood
B.
Ethanol
C.
Cow dung
D.
Atomic energy
Ans:
Atomic energy
Explanation :
The organic matter within the plants, the agriculture crops, and material related with the plants directly or in directly are called as the biomass.
[7] Which of the following has the highest bond order?
A.
N2
B.
O2
C.
Cl2
D.
H2
Ans:
N2
Explanation :
A high bond order indicates more attraction between electrons. A higher bond order also means that the atoms are held together more tightly.
[8] is used for making vinegar.
A.
Tartaric acid
B.
Mahe acid
C.
Oxalic acid
D.
Acetic acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COON) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[9] Major portion of the earth's crust is mainly constituted by –
A.
Oxygen and Iron
B.
Oxygen and Silicon
C.
Silicon and Iron
D.
Silicon and Aluminium
Ans:
Oxygen and Silicon
Explanation :
Oxygen is the most abundant element in the earth's crust, comprising 46.6% or the crust by weight. Silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61% also comprise the crust. Given the abundance of oxygen and silicon, the silicates are the most abundant minerals in the earth's crust.
[10] Cinnabar is an ore/mineral of –
A.
Lead
B.
Manganese
C.
Molybdenum
D.
Mercu
Ans:
Mercu
Explanation :
Cinnabarrefers to the common bright scarlet to brick red form of mercuryasullide (HgS) that is the most common source ore for refining elemental mercury. It is the historic source for the brilliant red or scarlet pigment termed vermilion and associated red mercury pigments.
[11] Which among the following is not a characteristic of transition metals?
A.
Tendency to gain electrons
B.
Low electronegativity
C.
Low ionization energy
D.
Malleability
Ans:
Tendency to gain electrons
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal enemy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable slate. When these metals form ions, the 4s electrons are always lost first; so, they form only cations (positive ions).
[12] Human nails are made up of -
A.
Pigment
B.
Elastin
C.
Albumin
D.
Keratin
Ans:
Keratin
Explanation :
Keratin, a family of fibrous structural proteins, is the key structural component of hair and nails.
[13] Meson particles are found in-
A.
R-rays
B.
X-rays
C.
Laser beam
D.
Cosmic rays
Ans:
Cosmic rays
Explanation :
Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behavior of their constituent quarks.
[14] Nitric acid does not react with -
A.
Gold
B.
Copper
C.
Zinc
D.
Iron
Ans:
Gold
Explanation :
Concentrated nitric acid is a very strong oxidator capable of reacting with the noble metals such as copper or silver. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid. However, pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid.
[15] The process of dissolving an acid or a base in water is a highly -
A.
Exothermic reaction
B.
Endothermic reaction
C.
Sublimation reaction
D.
Redux reaction
Ans:
Exothermic reaction
Explanation :
The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
[16] Atomic number is equal to -
A.
Number of electrons
B.
Number of neutron
C.
Number of protons
D.
Total number of protons and neutrons
Ans:
Number of protons
Explanation :
Atomic number is equal to Number of protons. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom.
[17] Which of the following does the Nucleus of an atom consist of?
A.
Protons and neutrons
B.
Protons and electrons
C.
Electrons
D.
Protons
Ans:
Protons and neutrons
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
A high bond order indicates more attraction between electrons. A higher bond order also means that the atoms are held together more tightly.
[8] is used for making vinegar.
A.
Tartaric acid
B.
Mahe acid
C.
Oxalic acid
D.
Acetic acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COON) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[9] Major portion of the earth's crust is mainly constituted by –
A.
Oxygen and Iron
B.
Oxygen and Silicon
C.
Silicon and Iron
D.
Silicon and Aluminium
Ans:
Oxygen and Silicon
Explanation :
Oxygen is the most abundant element in the earth's crust, comprising 46.6% or the crust by weight. Silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61% also comprise the crust. Given the abundance of oxygen and silicon, the silicates are the most abundant minerals in the earth's crust.
[10] Cinnabar is an ore/mineral of –
A.
Lead
B.
Manganese
C.
Molybdenum
D.
Mercu
Ans:
Mercu
Explanation :
Cinnabarrefers to the common bright scarlet to brick red form of mercuryasullide (HgS) that is the most common source ore for refining elemental mercury. It is the historic source for the brilliant red or scarlet pigment termed vermilion and associated red mercury pigments.
[11] Which among the following is not a characteristic of transition metals?
A.
Tendency to gain electrons
B.
Low electronegativity
C.
Low ionization energy
D.
Malleability
Ans:
Tendency to gain electrons
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal enemy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable slate. When these metals form ions, the 4s electrons are always lost first; so, they form only cations (positive ions).
[12] Human nails are made up of -
A.
Pigment
B.
Elastin
C.
Albumin
D.
Keratin
Ans:
Keratin
Explanation :
Keratin, a family of fibrous structural proteins, is the key structural component of hair and nails.
[13] Meson particles are found in-
A.
R-rays
B.
X-rays
C.
Laser beam
D.
Cosmic rays
Ans:
Cosmic rays
Explanation :
Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behavior of their constituent quarks.
[14] Nitric acid does not react with -
A.
Gold
B.
Copper
C.
Zinc
D.
Iron
Ans:
Gold
Explanation :
Concentrated nitric acid is a very strong oxidator capable of reacting with the noble metals such as copper or silver. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid. However, pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid.
[15] The process of dissolving an acid or a base in water is a highly -
A.
Exothermic reaction
B.
Endothermic reaction
C.
Sublimation reaction
D.
Redux reaction
Ans:
Exothermic reaction
Explanation :
The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
[16] Atomic number is equal to -
A.
Number of electrons
B.
Number of neutron
C.
Number of protons
D.
Total number of protons and neutrons
Ans:
Number of protons
Explanation :
Atomic number is equal to Number of protons. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom.
[17] Which of the following does the Nucleus of an atom consist of?
A.
Protons and neutrons
B.
Protons and electrons
C.
Electrons
D.
Protons
Ans:
Protons and neutrons
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
Oxygen is the most abundant element in the earth's crust, comprising 46.6% or the crust by weight. Silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61% also comprise the crust. Given the abundance of oxygen and silicon, the silicates are the most abundant minerals in the earth's crust.
[10] Cinnabar is an ore/mineral of –
A.
Lead
B.
Manganese
C.
Molybdenum
D.
Mercu
Ans:
Mercu
Explanation :
Cinnabarrefers to the common bright scarlet to brick red form of mercuryasullide (HgS) that is the most common source ore for refining elemental mercury. It is the historic source for the brilliant red or scarlet pigment termed vermilion and associated red mercury pigments.
[11] Which among the following is not a characteristic of transition metals?
A.
Tendency to gain electrons
B.
Low electronegativity
C.
Low ionization energy
D.
Malleability
Ans:
Tendency to gain electrons
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal enemy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable slate. When these metals form ions, the 4s electrons are always lost first; so, they form only cations (positive ions).
[12] Human nails are made up of -
A.
Pigment
B.
Elastin
C.
Albumin
D.
Keratin
Ans:
Keratin
Explanation :
Keratin, a family of fibrous structural proteins, is the key structural component of hair and nails.
[13] Meson particles are found in-
A.
R-rays
B.
X-rays
C.
Laser beam
D.
Cosmic rays
Ans:
Cosmic rays
Explanation :
Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behavior of their constituent quarks.
[14] Nitric acid does not react with -
A.
Gold
B.
Copper
C.
Zinc
D.
Iron
Ans:
Gold
Explanation :
Concentrated nitric acid is a very strong oxidator capable of reacting with the noble metals such as copper or silver. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid. However, pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid.
[15] The process of dissolving an acid or a base in water is a highly -
A.
Exothermic reaction
B.
Endothermic reaction
C.
Sublimation reaction
D.
Redux reaction
Ans:
Exothermic reaction
Explanation :
The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
[16] Atomic number is equal to -
A.
Number of electrons
B.
Number of neutron
C.
Number of protons
D.
Total number of protons and neutrons
Ans:
Number of protons
Explanation :
Atomic number is equal to Number of protons. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom.
[17] Which of the following does the Nucleus of an atom consist of?
A.
Protons and neutrons
B.
Protons and electrons
C.
Electrons
D.
Protons
Ans:
Protons and neutrons
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal enemy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable slate. When these metals form ions, the 4s electrons are always lost first; so, they form only cations (positive ions).
[12] Human nails are made up of -
A.
Pigment
B.
Elastin
C.
Albumin
D.
Keratin
Ans:
Keratin
Explanation :
Keratin, a family of fibrous structural proteins, is the key structural component of hair and nails.
[13] Meson particles are found in-
A.
R-rays
B.
X-rays
C.
Laser beam
D.
Cosmic rays
Ans:
Cosmic rays
Explanation :
Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behavior of their constituent quarks.
[14] Nitric acid does not react with -
A.
Gold
B.
Copper
C.
Zinc
D.
Iron
Ans:
Gold
Explanation :
Concentrated nitric acid is a very strong oxidator capable of reacting with the noble metals such as copper or silver. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid. However, pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid.
[15] The process of dissolving an acid or a base in water is a highly -
A.
Exothermic reaction
B.
Endothermic reaction
C.
Sublimation reaction
D.
Redux reaction
Ans:
Exothermic reaction
Explanation :
The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
[16] Atomic number is equal to -
A.
Number of electrons
B.
Number of neutron
C.
Number of protons
D.
Total number of protons and neutrons
Ans:
Number of protons
Explanation :
Atomic number is equal to Number of protons. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom.
[17] Which of the following does the Nucleus of an atom consist of?
A.
Protons and neutrons
B.
Protons and electrons
C.
Electrons
D.
Protons
Ans:
Protons and neutrons
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behavior of their constituent quarks.
[14] Nitric acid does not react with -
A.
Gold
B.
Copper
C.
Zinc
D.
Iron
Ans:
Gold
Explanation :
Concentrated nitric acid is a very strong oxidator capable of reacting with the noble metals such as copper or silver. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid. However, pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid.
[15] The process of dissolving an acid or a base in water is a highly -
A.
Exothermic reaction
B.
Endothermic reaction
C.
Sublimation reaction
D.
Redux reaction
Ans:
Exothermic reaction
Explanation :
The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
[16] Atomic number is equal to -
A.
Number of electrons
B.
Number of neutron
C.
Number of protons
D.
Total number of protons and neutrons
Ans:
Number of protons
Explanation :
Atomic number is equal to Number of protons. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom.
[17] Which of the following does the Nucleus of an atom consist of?
A.
Protons and neutrons
B.
Protons and electrons
C.
Electrons
D.
Protons
Ans:
Protons and neutrons
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
[16] Atomic number is equal to -
A.
Number of electrons
B.
Number of neutron
C.
Number of protons
D.
Total number of protons and neutrons
Ans:
Number of protons
Explanation :
Atomic number is equal to Number of protons. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom.
[17] Which of the following does the Nucleus of an atom consist of?
A.
Protons and neutrons
B.
Protons and electrons
C.
Electrons
D.
Protons
Ans:
Protons and neutrons
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. Protons and neutrons are bound together to form a nucleus by the nuclear force. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger-Marsden gold foil experiment.
[18] The gas dissolved in water that makes it basic is –
A.
ammo
B.
sulphur dioxide
C.
hydrogen
D.
carbon dioxide
Ans:
sulphur dioxide
Explanation :
Ammonia has that dissolves in water forms a solution of ammonium hydroxide (NH4OH). This solution (including the gas) is a strong base and will make the solution alkaline.
[19] The number of hydrogen bonds between guanine and cytosine in DNA is –
A.
2
B.
3
C.
4
D.
1
Ans:
3
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
[20] What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper?
A.
There is a crackling sound
B.
There is a violent explosion
C.
There is no reaction
D.
The paper ignites
Ans:
There is a violent explosion
Explanation :
When solid Potassium Permanganate (KMnO4) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol.
[21] Most commonly used bleaching agent is –
A.
Sodium chloride
B.
Alcohol
C.
Carbon dioxide
D.
Chlorine
Ans:
Chlorine
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
Chlorine is used to disinfect water and is part of the sanitation process for sewage and industrial waste. During the production of paper and cloth, it is used as a bleaching agent. It is also used in cleaning products; including household bleach which is chlorine dissolved in water Bleaching powder is an important and a commonly used bleaching agent prepared from chlorine.
[22] The heat value of combustion of Gasoline is -
A.
12600 kJ/kg
B.
14600 kJ/kg
C.
39400 kJ/kg
D.
47000 kJ/kg
Ans:
47000 kJ/kg
Explanation :
The calorific value of Gasoline is 47,300 kJ/kg. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0°C and under a pressure of 1,013 mbar).
[23] Who developed the model of atomic structure?
A.
Bohr and Rutherford
B.
Volta
C.
Alfred Nobel
D.
Faraday
Ans:
Bohr and Rutherford
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
[24] Which of the following is the main compound of voter ink?
A.
Silver nitrate
B.
Ammonium Chloride
C.
Silver Chloride
D.
Ammonium Nitrate
Ans:
Silver nitrate
Explanation :
The chemical used in voting inks is silver nitrate. Silver nitrate is preferred because it is soluble in water, and makes an inky black solution. When put on the skin, silver nitrate reacts with the salt present on it to form silver chloride that is insoluble in water, and clings to the skin, making it impossible to wash off with soap and water or even alcohol. Mysore Paints and Varnish Limited in Karnataka is only company in India authorised to produce the indelible ink.
[25] What is a common name for the substance which irritates lachrymal glands?
A.
Tear Gas
B.
Laughing Gas
C.
Anaesthetic Gas
D.
Noble Gas
Ans:
Tear Gas
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.
Explanation :
Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.