[1] The inert gas abundantly found in widely distributed is -
A.
Xe
B.
Kr
C.
He
D.
Ar
Ans:
Ar
Explanation :
Argon (Ar) is the most prevalent of the noble gases in Earth's crust with the element composing 0.00015% of this crust.
[2] Brine refers to :
A.
Salt water
B.
Sweet water
C.
Pure water
D.
Starch water
Ans:
Salt water
Explanation :
Brine is a solution of salt in water. In different contexts, brine may refer to salt solutions ranging from about 3.5% up to about 26%. Other levels of concentration are called in different names.
[3] The Bhopal tragedy was caused by the gas -
A.
phosgene
B.
carbon monoxide
C.
methyl isocyanate
D.
chlorine
Ans:
methyl isocyanate
Explanation :
The Bhopal disaster occurred on the night of 2-3 December 1984 at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh. Over 500,000 people were exposed to methyl isocyanate gas and other chemicals.
[4] Which one of the following contributes largely to the ‘green house effect’?
A.
Ozone
B.
Carbon monoxide
C.
Carbon dioxide
D.
Water vapour
Ans:
Water vapour
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. When these gases are ranked by their direct contribution to the greenhouse effect in percentage terms, the most important are: Water vapour: 36-72 per cent; Carbon dioxide: 9-26 per cent; Methane: 4-9 per cent; and Ozone: 3-7 per cent.
[5] The gas that usually causes explosions in coal mines is -
A.
Hydrogen
B.
Carbon monoxide
C.
Air
D.
Methane
Ans:
Methane
Explanation :
Methane is extremely flammable and may form explosive mixtures with air. Methane is violently reactive with oxidizers, halogens, and some halogen-containing compounds. Methane gas explosions are responsible for many deadly mining disasters.
[6] The chemical name for common salt -
A.
Sodium chloride
B.
Sodium hydroxide
C.
Sodium chlorate
D.
Potasium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride is also known common salt is an ionic compound with the chemical formul a NaCl, representing a 1:1 ratio of sodium and chloride ions.
[7] The I.C Chip used in a computer is made up of -
A.
Silicon
B.
Chromium
C.
Gold
D.
Lead
Ans:
Silicon
Explanation :
An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material that is normally silicon.
[8] The chemical name of "Plaster of Paris" commonly used for setting broken bones is –
A.
Calcium nitrate
B.
Calcium sulphate
C.
Calcium carbonate
D.
Calcium chloride
Ans:
Calcium sulphate
Explanation :
Plaster of Paris is the common name of Calcium Sulphate hemihydrate, with chemical formula: CaSO4.1/2H2O. Plaster of Paris is produced by heating gypsum to about 150°C.
[9] Which of the following is NOT malleable?
A.
Graphite
B.
Aluminium
C.
Copper
D.
Silver
Ans:
Graphite
Explanation :
Graphite is soft thanks to Van derWalls forces between to sheets of carbon atoms.
[10] The element found in the surface of the Moon is –
A.
Tin
B.
Tungsten
C.
Tantalum
D.
Titanium
Ans:
Titanium
Explanation :
Elements known to be present on the lunar surface include, among others, oxygen(O), silicon (Si), iron (Fe), magnesium (Mg), calcium (Ca), aluminium (Al), manganese (Mn) and titanium (Ti).
[11] Which of the following is not a chemical reaction'?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
The conversion of water into steam is an example of a physical change. where the state of the matter changes without changing its composition. A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
[12] Which of the following is used as anesthetic?
A.
NH3
B.
NO
C.
NO2
D.
N2O
Ans:
NO
Explanation :
Nitrous oxide (NO), commonly known as laughing as or happy gas, is the most commonly used inhalation anesthetic in dentistry and is commonly used in emergency centers and ambulatory surgery centers as well. It is an inorganic inhalation agent that is colorless, odorless to sweet-smelling, and nonirritating to the tissues.
[13] Gypsum is used for improvement of:
A.
Alkaline soils
B.
Saline soils
C.
Podsols
D.
Acidic soils
Ans:
Saline soils
Explanation :
Gypsum is calcium sulfate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodieity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.
[14] Spontaneous change is one in there is:
A.
A lowering of entropy
B.
A lowering of free energy
C.
Increase in free energy
D.
An increase in Internal energy
Ans:
A lowering of free energy
Explanation :
Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.
[15] In a freezer ice cubes will be formed more quickly in trays made of -
A.
rubber
B.
plastic
C.
aluminium
D.
wood
Ans:
aluminium
Explanation :
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
[16] Who discovered X-rays?
A.
W. C. Roentgen
B.
Albert Einstein
C.
Samuel Cohen
D.
Edward Taylor
Ans:
W. C. Roentgen
Explanation :
X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895.
[17] The important metal used with iron to produce stainless steel is –
A.
Al
B.
Chromium
C.
Tin
D.
Carbon
Ans:
Chromium
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
Argon (Ar) is the most prevalent of the noble gases in Earth's crust with the element composing 0.00015% of this crust.
[2] Brine refers to :
A.
Salt water
B.
Sweet water
C.
Pure water
D.
Starch water
Ans:
Salt water
Explanation :
Brine is a solution of salt in water. In different contexts, brine may refer to salt solutions ranging from about 3.5% up to about 26%. Other levels of concentration are called in different names.
[3] The Bhopal tragedy was caused by the gas -
A.
phosgene
B.
carbon monoxide
C.
methyl isocyanate
D.
chlorine
Ans:
methyl isocyanate
Explanation :
The Bhopal disaster occurred on the night of 2-3 December 1984 at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh. Over 500,000 people were exposed to methyl isocyanate gas and other chemicals.
[4] Which one of the following contributes largely to the ‘green house effect’?
A.
Ozone
B.
Carbon monoxide
C.
Carbon dioxide
D.
Water vapour
Ans:
Water vapour
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. When these gases are ranked by their direct contribution to the greenhouse effect in percentage terms, the most important are: Water vapour: 36-72 per cent; Carbon dioxide: 9-26 per cent; Methane: 4-9 per cent; and Ozone: 3-7 per cent.
[5] The gas that usually causes explosions in coal mines is -
A.
Hydrogen
B.
Carbon monoxide
C.
Air
D.
Methane
Ans:
Methane
Explanation :
Methane is extremely flammable and may form explosive mixtures with air. Methane is violently reactive with oxidizers, halogens, and some halogen-containing compounds. Methane gas explosions are responsible for many deadly mining disasters.
[6] The chemical name for common salt -
A.
Sodium chloride
B.
Sodium hydroxide
C.
Sodium chlorate
D.
Potasium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride is also known common salt is an ionic compound with the chemical formul a NaCl, representing a 1:1 ratio of sodium and chloride ions.
[7] The I.C Chip used in a computer is made up of -
A.
Silicon
B.
Chromium
C.
Gold
D.
Lead
Ans:
Silicon
Explanation :
An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material that is normally silicon.
[8] The chemical name of "Plaster of Paris" commonly used for setting broken bones is –
A.
Calcium nitrate
B.
Calcium sulphate
C.
Calcium carbonate
D.
Calcium chloride
Ans:
Calcium sulphate
Explanation :
Plaster of Paris is the common name of Calcium Sulphate hemihydrate, with chemical formula: CaSO4.1/2H2O. Plaster of Paris is produced by heating gypsum to about 150°C.
[9] Which of the following is NOT malleable?
A.
Graphite
B.
Aluminium
C.
Copper
D.
Silver
Ans:
Graphite
Explanation :
Graphite is soft thanks to Van derWalls forces between to sheets of carbon atoms.
[10] The element found in the surface of the Moon is –
A.
Tin
B.
Tungsten
C.
Tantalum
D.
Titanium
Ans:
Titanium
Explanation :
Elements known to be present on the lunar surface include, among others, oxygen(O), silicon (Si), iron (Fe), magnesium (Mg), calcium (Ca), aluminium (Al), manganese (Mn) and titanium (Ti).
[11] Which of the following is not a chemical reaction'?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
The conversion of water into steam is an example of a physical change. where the state of the matter changes without changing its composition. A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
[12] Which of the following is used as anesthetic?
A.
NH3
B.
NO
C.
NO2
D.
N2O
Ans:
NO
Explanation :
Nitrous oxide (NO), commonly known as laughing as or happy gas, is the most commonly used inhalation anesthetic in dentistry and is commonly used in emergency centers and ambulatory surgery centers as well. It is an inorganic inhalation agent that is colorless, odorless to sweet-smelling, and nonirritating to the tissues.
[13] Gypsum is used for improvement of:
A.
Alkaline soils
B.
Saline soils
C.
Podsols
D.
Acidic soils
Ans:
Saline soils
Explanation :
Gypsum is calcium sulfate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodieity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.
[14] Spontaneous change is one in there is:
A.
A lowering of entropy
B.
A lowering of free energy
C.
Increase in free energy
D.
An increase in Internal energy
Ans:
A lowering of free energy
Explanation :
Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.
[15] In a freezer ice cubes will be formed more quickly in trays made of -
A.
rubber
B.
plastic
C.
aluminium
D.
wood
Ans:
aluminium
Explanation :
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
[16] Who discovered X-rays?
A.
W. C. Roentgen
B.
Albert Einstein
C.
Samuel Cohen
D.
Edward Taylor
Ans:
W. C. Roentgen
Explanation :
X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895.
[17] The important metal used with iron to produce stainless steel is –
A.
Al
B.
Chromium
C.
Tin
D.
Carbon
Ans:
Chromium
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
The Bhopal disaster occurred on the night of 2-3 December 1984 at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh. Over 500,000 people were exposed to methyl isocyanate gas and other chemicals.
[4] Which one of the following contributes largely to the ‘green house effect’?
A.
Ozone
B.
Carbon monoxide
C.
Carbon dioxide
D.
Water vapour
Ans:
Water vapour
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. When these gases are ranked by their direct contribution to the greenhouse effect in percentage terms, the most important are: Water vapour: 36-72 per cent; Carbon dioxide: 9-26 per cent; Methane: 4-9 per cent; and Ozone: 3-7 per cent.
[5] The gas that usually causes explosions in coal mines is -
A.
Hydrogen
B.
Carbon monoxide
C.
Air
D.
Methane
Ans:
Methane
Explanation :
Methane is extremely flammable and may form explosive mixtures with air. Methane is violently reactive with oxidizers, halogens, and some halogen-containing compounds. Methane gas explosions are responsible for many deadly mining disasters.
[6] The chemical name for common salt -
A.
Sodium chloride
B.
Sodium hydroxide
C.
Sodium chlorate
D.
Potasium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride is also known common salt is an ionic compound with the chemical formul a NaCl, representing a 1:1 ratio of sodium and chloride ions.
[7] The I.C Chip used in a computer is made up of -
A.
Silicon
B.
Chromium
C.
Gold
D.
Lead
Ans:
Silicon
Explanation :
An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material that is normally silicon.
[8] The chemical name of "Plaster of Paris" commonly used for setting broken bones is –
A.
Calcium nitrate
B.
Calcium sulphate
C.
Calcium carbonate
D.
Calcium chloride
Ans:
Calcium sulphate
Explanation :
Plaster of Paris is the common name of Calcium Sulphate hemihydrate, with chemical formula: CaSO4.1/2H2O. Plaster of Paris is produced by heating gypsum to about 150°C.
[9] Which of the following is NOT malleable?
A.
Graphite
B.
Aluminium
C.
Copper
D.
Silver
Ans:
Graphite
Explanation :
Graphite is soft thanks to Van derWalls forces between to sheets of carbon atoms.
[10] The element found in the surface of the Moon is –
A.
Tin
B.
Tungsten
C.
Tantalum
D.
Titanium
Ans:
Titanium
Explanation :
Elements known to be present on the lunar surface include, among others, oxygen(O), silicon (Si), iron (Fe), magnesium (Mg), calcium (Ca), aluminium (Al), manganese (Mn) and titanium (Ti).
[11] Which of the following is not a chemical reaction'?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
The conversion of water into steam is an example of a physical change. where the state of the matter changes without changing its composition. A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
[12] Which of the following is used as anesthetic?
A.
NH3
B.
NO
C.
NO2
D.
N2O
Ans:
NO
Explanation :
Nitrous oxide (NO), commonly known as laughing as or happy gas, is the most commonly used inhalation anesthetic in dentistry and is commonly used in emergency centers and ambulatory surgery centers as well. It is an inorganic inhalation agent that is colorless, odorless to sweet-smelling, and nonirritating to the tissues.
[13] Gypsum is used for improvement of:
A.
Alkaline soils
B.
Saline soils
C.
Podsols
D.
Acidic soils
Ans:
Saline soils
Explanation :
Gypsum is calcium sulfate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodieity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.
[14] Spontaneous change is one in there is:
A.
A lowering of entropy
B.
A lowering of free energy
C.
Increase in free energy
D.
An increase in Internal energy
Ans:
A lowering of free energy
Explanation :
Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.
[15] In a freezer ice cubes will be formed more quickly in trays made of -
A.
rubber
B.
plastic
C.
aluminium
D.
wood
Ans:
aluminium
Explanation :
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
[16] Who discovered X-rays?
A.
W. C. Roentgen
B.
Albert Einstein
C.
Samuel Cohen
D.
Edward Taylor
Ans:
W. C. Roentgen
Explanation :
X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895.
[17] The important metal used with iron to produce stainless steel is –
A.
Al
B.
Chromium
C.
Tin
D.
Carbon
Ans:
Chromium
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
Methane is extremely flammable and may form explosive mixtures with air. Methane is violently reactive with oxidizers, halogens, and some halogen-containing compounds. Methane gas explosions are responsible for many deadly mining disasters.
[6] The chemical name for common salt -
A.
Sodium chloride
B.
Sodium hydroxide
C.
Sodium chlorate
D.
Potasium chloride
Ans:
Sodium chloride
Explanation :
Sodium chloride is also known common salt is an ionic compound with the chemical formul a NaCl, representing a 1:1 ratio of sodium and chloride ions.
[7] The I.C Chip used in a computer is made up of -
A.
Silicon
B.
Chromium
C.
Gold
D.
Lead
Ans:
Silicon
Explanation :
An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material that is normally silicon.
[8] The chemical name of "Plaster of Paris" commonly used for setting broken bones is –
A.
Calcium nitrate
B.
Calcium sulphate
C.
Calcium carbonate
D.
Calcium chloride
Ans:
Calcium sulphate
Explanation :
Plaster of Paris is the common name of Calcium Sulphate hemihydrate, with chemical formula: CaSO4.1/2H2O. Plaster of Paris is produced by heating gypsum to about 150°C.
[9] Which of the following is NOT malleable?
A.
Graphite
B.
Aluminium
C.
Copper
D.
Silver
Ans:
Graphite
Explanation :
Graphite is soft thanks to Van derWalls forces between to sheets of carbon atoms.
[10] The element found in the surface of the Moon is –
A.
Tin
B.
Tungsten
C.
Tantalum
D.
Titanium
Ans:
Titanium
Explanation :
Elements known to be present on the lunar surface include, among others, oxygen(O), silicon (Si), iron (Fe), magnesium (Mg), calcium (Ca), aluminium (Al), manganese (Mn) and titanium (Ti).
[11] Which of the following is not a chemical reaction'?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
The conversion of water into steam is an example of a physical change. where the state of the matter changes without changing its composition. A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
[12] Which of the following is used as anesthetic?
A.
NH3
B.
NO
C.
NO2
D.
N2O
Ans:
NO
Explanation :
Nitrous oxide (NO), commonly known as laughing as or happy gas, is the most commonly used inhalation anesthetic in dentistry and is commonly used in emergency centers and ambulatory surgery centers as well. It is an inorganic inhalation agent that is colorless, odorless to sweet-smelling, and nonirritating to the tissues.
[13] Gypsum is used for improvement of:
A.
Alkaline soils
B.
Saline soils
C.
Podsols
D.
Acidic soils
Ans:
Saline soils
Explanation :
Gypsum is calcium sulfate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodieity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.
[14] Spontaneous change is one in there is:
A.
A lowering of entropy
B.
A lowering of free energy
C.
Increase in free energy
D.
An increase in Internal energy
Ans:
A lowering of free energy
Explanation :
Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.
[15] In a freezer ice cubes will be formed more quickly in trays made of -
A.
rubber
B.
plastic
C.
aluminium
D.
wood
Ans:
aluminium
Explanation :
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
[16] Who discovered X-rays?
A.
W. C. Roentgen
B.
Albert Einstein
C.
Samuel Cohen
D.
Edward Taylor
Ans:
W. C. Roentgen
Explanation :
X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895.
[17] The important metal used with iron to produce stainless steel is –
A.
Al
B.
Chromium
C.
Tin
D.
Carbon
Ans:
Chromium
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material that is normally silicon.
[8] The chemical name of "Plaster of Paris" commonly used for setting broken bones is –
A.
Calcium nitrate
B.
Calcium sulphate
C.
Calcium carbonate
D.
Calcium chloride
Ans:
Calcium sulphate
Explanation :
Plaster of Paris is the common name of Calcium Sulphate hemihydrate, with chemical formula: CaSO4.1/2H2O. Plaster of Paris is produced by heating gypsum to about 150°C.
[9] Which of the following is NOT malleable?
A.
Graphite
B.
Aluminium
C.
Copper
D.
Silver
Ans:
Graphite
Explanation :
Graphite is soft thanks to Van derWalls forces between to sheets of carbon atoms.
[10] The element found in the surface of the Moon is –
A.
Tin
B.
Tungsten
C.
Tantalum
D.
Titanium
Ans:
Titanium
Explanation :
Elements known to be present on the lunar surface include, among others, oxygen(O), silicon (Si), iron (Fe), magnesium (Mg), calcium (Ca), aluminium (Al), manganese (Mn) and titanium (Ti).
[11] Which of the following is not a chemical reaction'?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
The conversion of water into steam is an example of a physical change. where the state of the matter changes without changing its composition. A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
[12] Which of the following is used as anesthetic?
A.
NH3
B.
NO
C.
NO2
D.
N2O
Ans:
NO
Explanation :
Nitrous oxide (NO), commonly known as laughing as or happy gas, is the most commonly used inhalation anesthetic in dentistry and is commonly used in emergency centers and ambulatory surgery centers as well. It is an inorganic inhalation agent that is colorless, odorless to sweet-smelling, and nonirritating to the tissues.
[13] Gypsum is used for improvement of:
A.
Alkaline soils
B.
Saline soils
C.
Podsols
D.
Acidic soils
Ans:
Saline soils
Explanation :
Gypsum is calcium sulfate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodieity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.
[14] Spontaneous change is one in there is:
A.
A lowering of entropy
B.
A lowering of free energy
C.
Increase in free energy
D.
An increase in Internal energy
Ans:
A lowering of free energy
Explanation :
Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.
[15] In a freezer ice cubes will be formed more quickly in trays made of -
A.
rubber
B.
plastic
C.
aluminium
D.
wood
Ans:
aluminium
Explanation :
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
[16] Who discovered X-rays?
A.
W. C. Roentgen
B.
Albert Einstein
C.
Samuel Cohen
D.
Edward Taylor
Ans:
W. C. Roentgen
Explanation :
X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895.
[17] The important metal used with iron to produce stainless steel is –
A.
Al
B.
Chromium
C.
Tin
D.
Carbon
Ans:
Chromium
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
Graphite is soft thanks to Van derWalls forces between to sheets of carbon atoms.
[10] The element found in the surface of the Moon is –
A.
Tin
B.
Tungsten
C.
Tantalum
D.
Titanium
Ans:
Titanium
Explanation :
Elements known to be present on the lunar surface include, among others, oxygen(O), silicon (Si), iron (Fe), magnesium (Mg), calcium (Ca), aluminium (Al), manganese (Mn) and titanium (Ti).
[11] Which of the following is not a chemical reaction'?
A.
Burning of paper
B.
Digestion of food
C.
Conversion of water into steam
D.
Burning of coal
Ans:
Conversion of water into steam
Explanation :
The conversion of water into steam is an example of a physical change. where the state of the matter changes without changing its composition. A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
[12] Which of the following is used as anesthetic?
A.
NH3
B.
NO
C.
NO2
D.
N2O
Ans:
NO
Explanation :
Nitrous oxide (NO), commonly known as laughing as or happy gas, is the most commonly used inhalation anesthetic in dentistry and is commonly used in emergency centers and ambulatory surgery centers as well. It is an inorganic inhalation agent that is colorless, odorless to sweet-smelling, and nonirritating to the tissues.
[13] Gypsum is used for improvement of:
A.
Alkaline soils
B.
Saline soils
C.
Podsols
D.
Acidic soils
Ans:
Saline soils
Explanation :
Gypsum is calcium sulfate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodieity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.
[14] Spontaneous change is one in there is:
A.
A lowering of entropy
B.
A lowering of free energy
C.
Increase in free energy
D.
An increase in Internal energy
Ans:
A lowering of free energy
Explanation :
Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.
[15] In a freezer ice cubes will be formed more quickly in trays made of -
A.
rubber
B.
plastic
C.
aluminium
D.
wood
Ans:
aluminium
Explanation :
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
[16] Who discovered X-rays?
A.
W. C. Roentgen
B.
Albert Einstein
C.
Samuel Cohen
D.
Edward Taylor
Ans:
W. C. Roentgen
Explanation :
X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895.
[17] The important metal used with iron to produce stainless steel is –
A.
Al
B.
Chromium
C.
Tin
D.
Carbon
Ans:
Chromium
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
The conversion of water into steam is an example of a physical change. where the state of the matter changes without changing its composition. A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
[12] Which of the following is used as anesthetic?
A.
NH3
B.
NO
C.
NO2
D.
N2O
Ans:
NO
Explanation :
Nitrous oxide (NO), commonly known as laughing as or happy gas, is the most commonly used inhalation anesthetic in dentistry and is commonly used in emergency centers and ambulatory surgery centers as well. It is an inorganic inhalation agent that is colorless, odorless to sweet-smelling, and nonirritating to the tissues.
[13] Gypsum is used for improvement of:
A.
Alkaline soils
B.
Saline soils
C.
Podsols
D.
Acidic soils
Ans:
Saline soils
Explanation :
Gypsum is calcium sulfate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodieity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.
[14] Spontaneous change is one in there is:
A.
A lowering of entropy
B.
A lowering of free energy
C.
Increase in free energy
D.
An increase in Internal energy
Ans:
A lowering of free energy
Explanation :
Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.
[15] In a freezer ice cubes will be formed more quickly in trays made of -
A.
rubber
B.
plastic
C.
aluminium
D.
wood
Ans:
aluminium
Explanation :
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
[16] Who discovered X-rays?
A.
W. C. Roentgen
B.
Albert Einstein
C.
Samuel Cohen
D.
Edward Taylor
Ans:
W. C. Roentgen
Explanation :
X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895.
[17] The important metal used with iron to produce stainless steel is –
A.
Al
B.
Chromium
C.
Tin
D.
Carbon
Ans:
Chromium
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
Gypsum is calcium sulfate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodieity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.
[14] Spontaneous change is one in there is:
A.
A lowering of entropy
B.
A lowering of free energy
C.
Increase in free energy
D.
An increase in Internal energy
Ans:
A lowering of free energy
Explanation :
Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.
[15] In a freezer ice cubes will be formed more quickly in trays made of -
A.
rubber
B.
plastic
C.
aluminium
D.
wood
Ans:
aluminium
Explanation :
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
[16] Who discovered X-rays?
A.
W. C. Roentgen
B.
Albert Einstein
C.
Samuel Cohen
D.
Edward Taylor
Ans:
W. C. Roentgen
Explanation :
X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895.
[17] The important metal used with iron to produce stainless steel is –
A.
Al
B.
Chromium
C.
Tin
D.
Carbon
Ans:
Chromium
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
[16] Who discovered X-rays?
A.
W. C. Roentgen
B.
Albert Einstein
C.
Samuel Cohen
D.
Edward Taylor
Ans:
W. C. Roentgen
Explanation :
X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895.
[17] The important metal used with iron to produce stainless steel is –
A.
Al
B.
Chromium
C.
Tin
D.
Carbon
Ans:
Chromium
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present.
[18] Which of the following is an Inert Gas?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Argon
Ans:
Argon
Explanation :
Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (A r), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
[19] Which one of the following metals does not form amalgam?
A.
Zinc
B.
Copper
C.
Magnesium
D.
Iron
Ans:
Iron
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring.
[20] Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A.
solar ultraviolet radiation
B.
solar infrared radiation
C.
CO2 in the air
D.
SO2 in the air
Ans:
solar ultraviolet radiation
Explanation :
Ozone layer serves as a protective shield against harmful solar ultraviolet radiation.
[21] Which of the following is Colourless?
A.
Chlorine
B.
Oxygen
C.
Phosphorus
D.
Sulphur
Ans:
Oxygen
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
0
[22] The two metal ions that cause hardness to water are:
A.
Calcium, Magnesium
B.
Sodium, Calcium
C.
Sodium, Potassium
D.
Sodium, Magnesium
Ans:
Calcium, Magnesium
Explanation :
Calcium and magnesium ion cause hardness of water.
[23] The liquid waste from kitchens and baths, of residences is known as:
A.
Domestic sewage
B.
Storm water
C.
Sullage
D.
Refuse
Ans:
Sullage
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
The liquid waste from kitchens and baths, of residence is known as sullage.
[24] Which one of the following is an example of a gel?
A.
Cheese
B.
Milk
C.
Face cream
D.
Shaving cream
Ans:
Face cream
Explanation :
A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel.
[25] Quartz is made of –
A.
Calcium Sulphate
B.
Calcium Silicate
C.
Sodium Sulphate
D.
Sodium Silicate
Ans:
Sodium Silicate
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Explanation :
Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.