[1] Carbon dioxide is –
A.
a reducing agent
B.
an oxidising agent
C.
a dehydrating agent
D.
a bleaching agent
Ans:
a reducing agent
Explanation :
A good reducing agent must be able to donate electrons readily. This means that it must not have very much attraction for electrons. Carbon dioxide is just like any other oxide and can be reduced to its respective elements by applied energy.
[2] An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is–
A.
17
B.
19
C.
36
D.
53
Ans:
19
Explanation :
Mass Number = number of protons (atomic number) + nu.sriber of neutrons. So as per the question, 36= number of neutrons + 17. Number of neutrons= 36 -17= 19
[3] The most reactive among the halogens is -
A.
Fluorine
B.
Chlorine
C.
Bromine
D.
Iodine
Ans:
Fluorine
Explanation :
Fluorine is one of the most reactive elements in existence, attacking otherwise inert materials such as glass, and forming compounds with the heavier noble gases. It is a corrosive and highly toxic gas. The reactivity of fluorine is such that if used or stored in laboratory glassware, it can react with glass in the presence of small amounts of water to form silicon tetrafluoride (SiF4).
[4] Black lung disease occurs in people working in –
A.
Electroplating industry
B.
Organic solvents industry
C.
Paint manufacturing industry
D.
Coal mines
Ans:
Coal mines
Explanation :
Coal worker's pneumoconiosis, colloquially referred to as black lung disease, is a lung disease that results from breathing in dust from coal, graphite, or man-made carbon over a long period of time. Inhaled coal dust progressively builds up in the lungs and is unable to be removed by the body; that leads to inflammation, fibrosis, and in worse cases, necrosis.
[5] NaCI has .
A.
Non-polar bonds
B.
Polar covalent bonds
C.
Metallic bonds
D.
Ionic bonds
Ans:
Ionic bonds
Explanation :
Sodium Chloride, NaCl. The classic case of ionic bonding, the sodium chloride molecule forms by the ionization of sodium and chlorine atoms and the attraction of the resulting ions.
[6] The metal used to recover copper from a solution of copper sulfate is -
A.
Na
B.
Ag
C.
Hg
D.
Fe
Ans:
Fe
Explanation :
The metal used to recover copper from a solution of copper sulfate is Fe.
[7] Which of the following is also known as 'Galena'?
A.
Lead sulphate
B.
Lead oxide
C.
Lead sulphide
D.
Calcium sulphate
Ans:
Lead sulphide
Explanation :
Galena, also called lead glance, is the natural mineral form of lead sulfide. It is the most important ore of lead and an important source of silver.
[8] Which of the following elements has the lowest melting point?
A.
Sodium
B.
Tin
C.
Radon
D.
Radium
Ans:
Radon
Explanation :
Among the given elements, Radon has the lowest melting point of-71° Celsius. The melting point of other elements are as follows: Sodium: 98° C; Tin 232° C; Radium: 700°C
[9] The oxidation number of nickel in K4[Ni(CN)4] is -
A.
Zero
B.
4
C.
-4
D.
8
Ans:
Zero
Explanation :
The oxidation number of nickel in K4[Ni(CN)4] is zero.
[10] The rusting of iron is a/an -
A.
physical change
B.
electrochemical change
C.
electrical change
D.
None of the above
Ans:
electrochemical change
Explanation :
When iron is exposed to air and moisture, its surface gradually corroded and converted into a brown mass. The rusting of iron is due to the formation of hydrated ion. Rusting is an electro-chemical process.
[11] Ethanol containing 5% water is known as –
A.
Dilute alcohol
B.
Power alcohol
C.
Rectified spirit
D.
Absolute alcohol
Ans:
Rectified spirit
Explanation :
A rectified alcohol is highly concentrated ethanol which' has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume and 5% water. Normally, ethanol with 5% water is known as pure alcohol.
[12] Stains of rust on clothes can be removed by –
A.
Oxalic acid
B.
Petrol
C.
Alcohol
D.
H2O2
Ans:
Oxalic acid
Explanation :
Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water.
[13] If a solution turns blue litmus red, its pH is likely to be :
A.
7
B.
8
C.
9
D.
6
Ans:
6
Explanation :
An acidic solution turns blue litmus red. On the pH scale, acids have values less than 7, whereas bases have values greater than 7. Solutions with pH equal to 7 are neutral in nature. Therefore the pH of the given solution is likely to be 6.
[14] An element with an atomic number of 17 is -
A.
an alkali metal
B.
a rare gas
C.
a halogen gas
D.
a transition metal
Ans:
a halogen gas
Explanation :
Chlorine has atomic number of 17. It is a halogen gas along with fluorine (F), bromine (Br), iodine (I), and astatine (At).
[15] Consider the following and select the right option.
A.
Stomach - Hydrochloric acid
B.
Ant - formic acid
C.
Both are right
D.
Both are wrong
Ans:
Both are right
Explanation :
Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach.
[16] As which one of the following, does carbon occur in its purest form in nature?
A.
Carbon black
B.
Graphite
C.
Diamond
D.
Coal
Ans:
Diamond
Explanation :
The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
[17] Which among the following is a covalent compound?
A.
Calcium chloride
B.
Magnesium fluoride
C.
Sodium chloride
D.
Carbon tetrachloride
Ans:
Carbon tetrachloride
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
A good reducing agent must be able to donate electrons readily. This means that it must not have very much attraction for electrons. Carbon dioxide is just like any other oxide and can be reduced to its respective elements by applied energy.
[2] An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is–
A.
17
B.
19
C.
36
D.
53
Ans:
19
Explanation :
Mass Number = number of protons (atomic number) + nu.sriber of neutrons. So as per the question, 36= number of neutrons + 17. Number of neutrons= 36 -17= 19
[3] The most reactive among the halogens is -
A.
Fluorine
B.
Chlorine
C.
Bromine
D.
Iodine
Ans:
Fluorine
Explanation :
Fluorine is one of the most reactive elements in existence, attacking otherwise inert materials such as glass, and forming compounds with the heavier noble gases. It is a corrosive and highly toxic gas. The reactivity of fluorine is such that if used or stored in laboratory glassware, it can react with glass in the presence of small amounts of water to form silicon tetrafluoride (SiF4).
[4] Black lung disease occurs in people working in –
A.
Electroplating industry
B.
Organic solvents industry
C.
Paint manufacturing industry
D.
Coal mines
Ans:
Coal mines
Explanation :
Coal worker's pneumoconiosis, colloquially referred to as black lung disease, is a lung disease that results from breathing in dust from coal, graphite, or man-made carbon over a long period of time. Inhaled coal dust progressively builds up in the lungs and is unable to be removed by the body; that leads to inflammation, fibrosis, and in worse cases, necrosis.
[5] NaCI has .
A.
Non-polar bonds
B.
Polar covalent bonds
C.
Metallic bonds
D.
Ionic bonds
Ans:
Ionic bonds
Explanation :
Sodium Chloride, NaCl. The classic case of ionic bonding, the sodium chloride molecule forms by the ionization of sodium and chlorine atoms and the attraction of the resulting ions.
[6] The metal used to recover copper from a solution of copper sulfate is -
A.
Na
B.
Ag
C.
Hg
D.
Fe
Ans:
Fe
Explanation :
The metal used to recover copper from a solution of copper sulfate is Fe.
[7] Which of the following is also known as 'Galena'?
A.
Lead sulphate
B.
Lead oxide
C.
Lead sulphide
D.
Calcium sulphate
Ans:
Lead sulphide
Explanation :
Galena, also called lead glance, is the natural mineral form of lead sulfide. It is the most important ore of lead and an important source of silver.
[8] Which of the following elements has the lowest melting point?
A.
Sodium
B.
Tin
C.
Radon
D.
Radium
Ans:
Radon
Explanation :
Among the given elements, Radon has the lowest melting point of-71° Celsius. The melting point of other elements are as follows: Sodium: 98° C; Tin 232° C; Radium: 700°C
[9] The oxidation number of nickel in K4[Ni(CN)4] is -
A.
Zero
B.
4
C.
-4
D.
8
Ans:
Zero
Explanation :
The oxidation number of nickel in K4[Ni(CN)4] is zero.
[10] The rusting of iron is a/an -
A.
physical change
B.
electrochemical change
C.
electrical change
D.
None of the above
Ans:
electrochemical change
Explanation :
When iron is exposed to air and moisture, its surface gradually corroded and converted into a brown mass. The rusting of iron is due to the formation of hydrated ion. Rusting is an electro-chemical process.
[11] Ethanol containing 5% water is known as –
A.
Dilute alcohol
B.
Power alcohol
C.
Rectified spirit
D.
Absolute alcohol
Ans:
Rectified spirit
Explanation :
A rectified alcohol is highly concentrated ethanol which' has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume and 5% water. Normally, ethanol with 5% water is known as pure alcohol.
[12] Stains of rust on clothes can be removed by –
A.
Oxalic acid
B.
Petrol
C.
Alcohol
D.
H2O2
Ans:
Oxalic acid
Explanation :
Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water.
[13] If a solution turns blue litmus red, its pH is likely to be :
A.
7
B.
8
C.
9
D.
6
Ans:
6
Explanation :
An acidic solution turns blue litmus red. On the pH scale, acids have values less than 7, whereas bases have values greater than 7. Solutions with pH equal to 7 are neutral in nature. Therefore the pH of the given solution is likely to be 6.
[14] An element with an atomic number of 17 is -
A.
an alkali metal
B.
a rare gas
C.
a halogen gas
D.
a transition metal
Ans:
a halogen gas
Explanation :
Chlorine has atomic number of 17. It is a halogen gas along with fluorine (F), bromine (Br), iodine (I), and astatine (At).
[15] Consider the following and select the right option.
A.
Stomach - Hydrochloric acid
B.
Ant - formic acid
C.
Both are right
D.
Both are wrong
Ans:
Both are right
Explanation :
Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach.
[16] As which one of the following, does carbon occur in its purest form in nature?
A.
Carbon black
B.
Graphite
C.
Diamond
D.
Coal
Ans:
Diamond
Explanation :
The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
[17] Which among the following is a covalent compound?
A.
Calcium chloride
B.
Magnesium fluoride
C.
Sodium chloride
D.
Carbon tetrachloride
Ans:
Carbon tetrachloride
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
Fluorine is one of the most reactive elements in existence, attacking otherwise inert materials such as glass, and forming compounds with the heavier noble gases. It is a corrosive and highly toxic gas. The reactivity of fluorine is such that if used or stored in laboratory glassware, it can react with glass in the presence of small amounts of water to form silicon tetrafluoride (SiF4).
[4] Black lung disease occurs in people working in –
A.
Electroplating industry
B.
Organic solvents industry
C.
Paint manufacturing industry
D.
Coal mines
Ans:
Coal mines
Explanation :
Coal worker's pneumoconiosis, colloquially referred to as black lung disease, is a lung disease that results from breathing in dust from coal, graphite, or man-made carbon over a long period of time. Inhaled coal dust progressively builds up in the lungs and is unable to be removed by the body; that leads to inflammation, fibrosis, and in worse cases, necrosis.
[5] NaCI has .
A.
Non-polar bonds
B.
Polar covalent bonds
C.
Metallic bonds
D.
Ionic bonds
Ans:
Ionic bonds
Explanation :
Sodium Chloride, NaCl. The classic case of ionic bonding, the sodium chloride molecule forms by the ionization of sodium and chlorine atoms and the attraction of the resulting ions.
[6] The metal used to recover copper from a solution of copper sulfate is -
A.
Na
B.
Ag
C.
Hg
D.
Fe
Ans:
Fe
Explanation :
The metal used to recover copper from a solution of copper sulfate is Fe.
[7] Which of the following is also known as 'Galena'?
A.
Lead sulphate
B.
Lead oxide
C.
Lead sulphide
D.
Calcium sulphate
Ans:
Lead sulphide
Explanation :
Galena, also called lead glance, is the natural mineral form of lead sulfide. It is the most important ore of lead and an important source of silver.
[8] Which of the following elements has the lowest melting point?
A.
Sodium
B.
Tin
C.
Radon
D.
Radium
Ans:
Radon
Explanation :
Among the given elements, Radon has the lowest melting point of-71° Celsius. The melting point of other elements are as follows: Sodium: 98° C; Tin 232° C; Radium: 700°C
[9] The oxidation number of nickel in K4[Ni(CN)4] is -
A.
Zero
B.
4
C.
-4
D.
8
Ans:
Zero
Explanation :
The oxidation number of nickel in K4[Ni(CN)4] is zero.
[10] The rusting of iron is a/an -
A.
physical change
B.
electrochemical change
C.
electrical change
D.
None of the above
Ans:
electrochemical change
Explanation :
When iron is exposed to air and moisture, its surface gradually corroded and converted into a brown mass. The rusting of iron is due to the formation of hydrated ion. Rusting is an electro-chemical process.
[11] Ethanol containing 5% water is known as –
A.
Dilute alcohol
B.
Power alcohol
C.
Rectified spirit
D.
Absolute alcohol
Ans:
Rectified spirit
Explanation :
A rectified alcohol is highly concentrated ethanol which' has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume and 5% water. Normally, ethanol with 5% water is known as pure alcohol.
[12] Stains of rust on clothes can be removed by –
A.
Oxalic acid
B.
Petrol
C.
Alcohol
D.
H2O2
Ans:
Oxalic acid
Explanation :
Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water.
[13] If a solution turns blue litmus red, its pH is likely to be :
A.
7
B.
8
C.
9
D.
6
Ans:
6
Explanation :
An acidic solution turns blue litmus red. On the pH scale, acids have values less than 7, whereas bases have values greater than 7. Solutions with pH equal to 7 are neutral in nature. Therefore the pH of the given solution is likely to be 6.
[14] An element with an atomic number of 17 is -
A.
an alkali metal
B.
a rare gas
C.
a halogen gas
D.
a transition metal
Ans:
a halogen gas
Explanation :
Chlorine has atomic number of 17. It is a halogen gas along with fluorine (F), bromine (Br), iodine (I), and astatine (At).
[15] Consider the following and select the right option.
A.
Stomach - Hydrochloric acid
B.
Ant - formic acid
C.
Both are right
D.
Both are wrong
Ans:
Both are right
Explanation :
Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach.
[16] As which one of the following, does carbon occur in its purest form in nature?
A.
Carbon black
B.
Graphite
C.
Diamond
D.
Coal
Ans:
Diamond
Explanation :
The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
[17] Which among the following is a covalent compound?
A.
Calcium chloride
B.
Magnesium fluoride
C.
Sodium chloride
D.
Carbon tetrachloride
Ans:
Carbon tetrachloride
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
Sodium Chloride, NaCl. The classic case of ionic bonding, the sodium chloride molecule forms by the ionization of sodium and chlorine atoms and the attraction of the resulting ions.
[6] The metal used to recover copper from a solution of copper sulfate is -
A.
Na
B.
Ag
C.
Hg
D.
Fe
Ans:
Fe
Explanation :
The metal used to recover copper from a solution of copper sulfate is Fe.
[7] Which of the following is also known as 'Galena'?
A.
Lead sulphate
B.
Lead oxide
C.
Lead sulphide
D.
Calcium sulphate
Ans:
Lead sulphide
Explanation :
Galena, also called lead glance, is the natural mineral form of lead sulfide. It is the most important ore of lead and an important source of silver.
[8] Which of the following elements has the lowest melting point?
A.
Sodium
B.
Tin
C.
Radon
D.
Radium
Ans:
Radon
Explanation :
Among the given elements, Radon has the lowest melting point of-71° Celsius. The melting point of other elements are as follows: Sodium: 98° C; Tin 232° C; Radium: 700°C
[9] The oxidation number of nickel in K4[Ni(CN)4] is -
A.
Zero
B.
4
C.
-4
D.
8
Ans:
Zero
Explanation :
The oxidation number of nickel in K4[Ni(CN)4] is zero.
[10] The rusting of iron is a/an -
A.
physical change
B.
electrochemical change
C.
electrical change
D.
None of the above
Ans:
electrochemical change
Explanation :
When iron is exposed to air and moisture, its surface gradually corroded and converted into a brown mass. The rusting of iron is due to the formation of hydrated ion. Rusting is an electro-chemical process.
[11] Ethanol containing 5% water is known as –
A.
Dilute alcohol
B.
Power alcohol
C.
Rectified spirit
D.
Absolute alcohol
Ans:
Rectified spirit
Explanation :
A rectified alcohol is highly concentrated ethanol which' has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume and 5% water. Normally, ethanol with 5% water is known as pure alcohol.
[12] Stains of rust on clothes can be removed by –
A.
Oxalic acid
B.
Petrol
C.
Alcohol
D.
H2O2
Ans:
Oxalic acid
Explanation :
Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water.
[13] If a solution turns blue litmus red, its pH is likely to be :
A.
7
B.
8
C.
9
D.
6
Ans:
6
Explanation :
An acidic solution turns blue litmus red. On the pH scale, acids have values less than 7, whereas bases have values greater than 7. Solutions with pH equal to 7 are neutral in nature. Therefore the pH of the given solution is likely to be 6.
[14] An element with an atomic number of 17 is -
A.
an alkali metal
B.
a rare gas
C.
a halogen gas
D.
a transition metal
Ans:
a halogen gas
Explanation :
Chlorine has atomic number of 17. It is a halogen gas along with fluorine (F), bromine (Br), iodine (I), and astatine (At).
[15] Consider the following and select the right option.
A.
Stomach - Hydrochloric acid
B.
Ant - formic acid
C.
Both are right
D.
Both are wrong
Ans:
Both are right
Explanation :
Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach.
[16] As which one of the following, does carbon occur in its purest form in nature?
A.
Carbon black
B.
Graphite
C.
Diamond
D.
Coal
Ans:
Diamond
Explanation :
The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
[17] Which among the following is a covalent compound?
A.
Calcium chloride
B.
Magnesium fluoride
C.
Sodium chloride
D.
Carbon tetrachloride
Ans:
Carbon tetrachloride
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
Galena, also called lead glance, is the natural mineral form of lead sulfide. It is the most important ore of lead and an important source of silver.
[8] Which of the following elements has the lowest melting point?
A.
Sodium
B.
Tin
C.
Radon
D.
Radium
Ans:
Radon
Explanation :
Among the given elements, Radon has the lowest melting point of-71° Celsius. The melting point of other elements are as follows: Sodium: 98° C; Tin 232° C; Radium: 700°C
[9] The oxidation number of nickel in K4[Ni(CN)4] is -
A.
Zero
B.
4
C.
-4
D.
8
Ans:
Zero
Explanation :
The oxidation number of nickel in K4[Ni(CN)4] is zero.
[10] The rusting of iron is a/an -
A.
physical change
B.
electrochemical change
C.
electrical change
D.
None of the above
Ans:
electrochemical change
Explanation :
When iron is exposed to air and moisture, its surface gradually corroded and converted into a brown mass. The rusting of iron is due to the formation of hydrated ion. Rusting is an electro-chemical process.
[11] Ethanol containing 5% water is known as –
A.
Dilute alcohol
B.
Power alcohol
C.
Rectified spirit
D.
Absolute alcohol
Ans:
Rectified spirit
Explanation :
A rectified alcohol is highly concentrated ethanol which' has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume and 5% water. Normally, ethanol with 5% water is known as pure alcohol.
[12] Stains of rust on clothes can be removed by –
A.
Oxalic acid
B.
Petrol
C.
Alcohol
D.
H2O2
Ans:
Oxalic acid
Explanation :
Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water.
[13] If a solution turns blue litmus red, its pH is likely to be :
A.
7
B.
8
C.
9
D.
6
Ans:
6
Explanation :
An acidic solution turns blue litmus red. On the pH scale, acids have values less than 7, whereas bases have values greater than 7. Solutions with pH equal to 7 are neutral in nature. Therefore the pH of the given solution is likely to be 6.
[14] An element with an atomic number of 17 is -
A.
an alkali metal
B.
a rare gas
C.
a halogen gas
D.
a transition metal
Ans:
a halogen gas
Explanation :
Chlorine has atomic number of 17. It is a halogen gas along with fluorine (F), bromine (Br), iodine (I), and astatine (At).
[15] Consider the following and select the right option.
A.
Stomach - Hydrochloric acid
B.
Ant - formic acid
C.
Both are right
D.
Both are wrong
Ans:
Both are right
Explanation :
Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach.
[16] As which one of the following, does carbon occur in its purest form in nature?
A.
Carbon black
B.
Graphite
C.
Diamond
D.
Coal
Ans:
Diamond
Explanation :
The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
[17] Which among the following is a covalent compound?
A.
Calcium chloride
B.
Magnesium fluoride
C.
Sodium chloride
D.
Carbon tetrachloride
Ans:
Carbon tetrachloride
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
The oxidation number of nickel in K4[Ni(CN)4] is zero.
[10] The rusting of iron is a/an -
A.
physical change
B.
electrochemical change
C.
electrical change
D.
None of the above
Ans:
electrochemical change
Explanation :
When iron is exposed to air and moisture, its surface gradually corroded and converted into a brown mass. The rusting of iron is due to the formation of hydrated ion. Rusting is an electro-chemical process.
[11] Ethanol containing 5% water is known as –
A.
Dilute alcohol
B.
Power alcohol
C.
Rectified spirit
D.
Absolute alcohol
Ans:
Rectified spirit
Explanation :
A rectified alcohol is highly concentrated ethanol which' has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume and 5% water. Normally, ethanol with 5% water is known as pure alcohol.
[12] Stains of rust on clothes can be removed by –
A.
Oxalic acid
B.
Petrol
C.
Alcohol
D.
H2O2
Ans:
Oxalic acid
Explanation :
Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water.
[13] If a solution turns blue litmus red, its pH is likely to be :
A.
7
B.
8
C.
9
D.
6
Ans:
6
Explanation :
An acidic solution turns blue litmus red. On the pH scale, acids have values less than 7, whereas bases have values greater than 7. Solutions with pH equal to 7 are neutral in nature. Therefore the pH of the given solution is likely to be 6.
[14] An element with an atomic number of 17 is -
A.
an alkali metal
B.
a rare gas
C.
a halogen gas
D.
a transition metal
Ans:
a halogen gas
Explanation :
Chlorine has atomic number of 17. It is a halogen gas along with fluorine (F), bromine (Br), iodine (I), and astatine (At).
[15] Consider the following and select the right option.
A.
Stomach - Hydrochloric acid
B.
Ant - formic acid
C.
Both are right
D.
Both are wrong
Ans:
Both are right
Explanation :
Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach.
[16] As which one of the following, does carbon occur in its purest form in nature?
A.
Carbon black
B.
Graphite
C.
Diamond
D.
Coal
Ans:
Diamond
Explanation :
The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
[17] Which among the following is a covalent compound?
A.
Calcium chloride
B.
Magnesium fluoride
C.
Sodium chloride
D.
Carbon tetrachloride
Ans:
Carbon tetrachloride
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
A rectified alcohol is highly concentrated ethanol which' has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume and 5% water. Normally, ethanol with 5% water is known as pure alcohol.
[12] Stains of rust on clothes can be removed by –
A.
Oxalic acid
B.
Petrol
C.
Alcohol
D.
H2O2
Ans:
Oxalic acid
Explanation :
Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water.
[13] If a solution turns blue litmus red, its pH is likely to be :
A.
7
B.
8
C.
9
D.
6
Ans:
6
Explanation :
An acidic solution turns blue litmus red. On the pH scale, acids have values less than 7, whereas bases have values greater than 7. Solutions with pH equal to 7 are neutral in nature. Therefore the pH of the given solution is likely to be 6.
[14] An element with an atomic number of 17 is -
A.
an alkali metal
B.
a rare gas
C.
a halogen gas
D.
a transition metal
Ans:
a halogen gas
Explanation :
Chlorine has atomic number of 17. It is a halogen gas along with fluorine (F), bromine (Br), iodine (I), and astatine (At).
[15] Consider the following and select the right option.
A.
Stomach - Hydrochloric acid
B.
Ant - formic acid
C.
Both are right
D.
Both are wrong
Ans:
Both are right
Explanation :
Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach.
[16] As which one of the following, does carbon occur in its purest form in nature?
A.
Carbon black
B.
Graphite
C.
Diamond
D.
Coal
Ans:
Diamond
Explanation :
The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
[17] Which among the following is a covalent compound?
A.
Calcium chloride
B.
Magnesium fluoride
C.
Sodium chloride
D.
Carbon tetrachloride
Ans:
Carbon tetrachloride
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
An acidic solution turns blue litmus red. On the pH scale, acids have values less than 7, whereas bases have values greater than 7. Solutions with pH equal to 7 are neutral in nature. Therefore the pH of the given solution is likely to be 6.
[14] An element with an atomic number of 17 is -
A.
an alkali metal
B.
a rare gas
C.
a halogen gas
D.
a transition metal
Ans:
a halogen gas
Explanation :
Chlorine has atomic number of 17. It is a halogen gas along with fluorine (F), bromine (Br), iodine (I), and astatine (At).
[15] Consider the following and select the right option.
A.
Stomach - Hydrochloric acid
B.
Ant - formic acid
C.
Both are right
D.
Both are wrong
Ans:
Both are right
Explanation :
Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach.
[16] As which one of the following, does carbon occur in its purest form in nature?
A.
Carbon black
B.
Graphite
C.
Diamond
D.
Coal
Ans:
Diamond
Explanation :
The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
[17] Which among the following is a covalent compound?
A.
Calcium chloride
B.
Magnesium fluoride
C.
Sodium chloride
D.
Carbon tetrachloride
Ans:
Carbon tetrachloride
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach.
[16] As which one of the following, does carbon occur in its purest form in nature?
A.
Carbon black
B.
Graphite
C.
Diamond
D.
Coal
Ans:
Diamond
Explanation :
The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
[17] Which among the following is a covalent compound?
A.
Calcium chloride
B.
Magnesium fluoride
C.
Sodium chloride
D.
Carbon tetrachloride
Ans:
Carbon tetrachloride
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals
[18] The highest volume of gases in lower atmosphere is comprised of -
A.
Hydrogen
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
Ans:
Nitrogen
Explanation :
There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases.
[19] The alkoloid naturally found in coffee, cocoa and cola nut is –
A.
Cocaine
B.
Morphine
C.
Tannin
D.
Caffeine
Ans:
Caffeine
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic.
[20] The metal used for making air crafts and rockets is –
A.
Lead
B.
Aluminium
C.
Nickel
D.
Copper
Ans:
Nickel
Explanation :
Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.
[21] At what temperature is the density of water the maximum?
A.
2°C
B.
4°C
C.
0°C
D.
1°C
Ans:
4°C
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F).
[22] Soil having high content of aluminum and iron oxide is also known as -
A.
meadow soil
B.
pedalfer soil
C.
chernozen soil
D.
podzol soil
Ans:
pedalfer soil
Explanation :
Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation.
[23] Chile saltpeter is the common name of:
A.
Sodium nitrate
B.
Potassium nitrite
C.
Potassium nitrate
D.
Sodium nitrite
Ans:
Sodium nitrate
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant.
[24] The gas liberated in the Bhopal gas tragedy was:
A.
Pheynl isocynate
B.
Acetylene
C.
Ethylene
D.
Methyl isocynate
Ans:
Methyl isocynate
Explanation :
The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster.
[25] Which of the following is not a gaseous air pollutant?
A.
Oxides of nitrogen
B.
Hydrocarbon
C.
Smoke
D.
Oxides of sulphur
Ans:
Hydrocarbon
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.
Explanation :
The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.