[1] Which is abundant in Gobar gas?
A.
Carbon dioxide
B.
Methane
C.
Oxygen
D.
Hydrogen
Ans:
Methane
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood.
[2] The most suitable vessel for storing concentrated sulphuric acid is –
A.
Copper vessel
B.
Aluminium vessel
C.
Glass vessel
D.
Earthen vessel
Ans:
Glass vessel
Explanation :
Concentrated Sulfuric acid can only be stored in glass, no metal lids, some plastic containers. It will attack anything organic, causing severe burns, the good thing is it will not start a fire but if it goes into contact with a metal it may generate hydrogen gas, an explosion risk.
[3] The radioactive element used in heart pacemakers is –
A.
Uranium
B.
Deuterium
C.
Plutonium
D.
Radium
Ans:
Uranium
Explanation :
The actinides (or actinoids) are the chemical elements with atomic numbers between 90 and 109 inclusively. They occur between Groups 3 and 4 in Period 7 of the periodic table. All elements in this family are radioactive. Five actinides namely: thorium, protoactinium, uranium, neptunium, and plutonium have been found in nature. Plutonium is used in the manufacture of nuclear weapons and as the power source in nuclear power plants. On a smaller scale, it is also used as a power source in smaller devices such as the heart pacemaker.
[4] The element which is commonly used in nuclear for producing electricity by nuclear fission is –
A.
Radium
B.
Plutonium
C.
Uranium
D.
Deuterium
Ans:
Uranium
Explanation :
Uranium is used to produce a chemical and nuclear reaction which makes a lot of heat. This heat is used to turn water into steam, which turns turbines...turbines generate electricity.
[5] Which amidst the following is not a gem stone?
A.
Cat's-eye
B.
Topaz
C.
Opal
D.
Pearl
Ans:
Cat's-eye
Explanation :
A gemstone or gem (also called a precious or semi-precious stone, a fine gem, or jewel) is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments.
[6] Which of the following vegetable oils does not contain essential fatty acids?
A.
Sunflower oil
B.
Mustard oil
C.
Coconut oil
D.
Gmundnut oil
Ans:
Sunflower oil
Explanation :
Fatty Acids are aliphatic carboxylic acid with varying hydrocarbon lengths at one end of the chain joined to terminal carboxyl (-COOH) group at the other end.
[7] Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes?
A.
Borax
B.
Saltpetre
C.
Hydrogen peroxide
D.
Sodium chloride
Ans:
Sodium chloride
Explanation :
Antiseptics are antimicrobial substances that are applied to living tissue/skin to reduce the possibility of infection, sepsis, or putrefaction. Antiseptics are generally distinguished from antibiotics by the latter's ability to be transported through the lymphatic system to destroy bacteria within the body, and from disinfectants, which destroy microorganisms found on non-living objects.
[8] Which one of the following is used to restore the colour of old oil-paintings?
A.
Ozone
B.
Hydrogen peroxide
C.
Barium peroxide
D.
Sodium peroxide
Ans:
Hydrogen peroxide
Explanation :
Hydrogen peroxide (H2O2) is the simplest peroxide (a compound with an oxygen-oxygen single bond). It is also a strong oxidizer. Hydrogen peroxide is a clear liquid, slightly more viscous than water. In dilute solution, it appears colourless. Due to its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent. The oxidizing capacity of hydrogen peroxide is so strong that it is considered a highly reactive oxygen species.
[9] A mixture of benzene and toluene forms -
A.
Non-ideal solution
B.
Ideal solution
C.
Emulsion
D.
Suspension
Ans:
Ideal solution
Explanation :
A mixture of benzene and toluene (60 mole% toluene) enters a distillation column to be separated into two product streams.
[10] The aqueous solution of which acids is called Vinegar -
A.
Citric acid
B.
Hydrochloric acid
C.
Acetic acid
D.
Oxalic acid
Ans:
Acetic acid
Explanation :
Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. Vinegar typically contains 5–20% acetic acid by volume.
[11] What happens to its potential energy when an object is taken to high altitude?
A.
Its potential energy increases
B.
Its potential energy decreases
C.
Its potential energy remain same
D.
None of the above
Ans:
Its potential energy increases
Explanation :
When an object is taken to high altitude its potential energy increases.
[12] Which one of the following noble gases is not found in the atmosphere?
A.
Argon
B.
Krypton
C.
Radon
D.
Xenon
Ans:
Radon
Explanation :
All the noble gases are present in Earth's atmosphere and, except for helium and radon, their major commercial source is the air, from which they are obtained by liquefaction and fractional distillation.
[13] The fuel used in an atomic reactor is –
A.
Coal
B.
Petrol
C.
Combustable gases
D.
Uranium
Ans:
Uranium
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators. Some produce isotopes for medical and industrial use, and some are run only for research.
[14] Mortar is a mixture of water sand and –
A.
Slaked lime
B.
Quick lime
C.
Limestone
D.
Gypsum
Ans:
Slaked lime
Explanation :
Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone, brick, cinder blocks, etc. Mortar becomes hard when it sets, resulting in a rigid aggregate structure. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime (slaked), and water. Mortar can also be used to fix, or point, masonry when the original mortar has washed away.
[15] The element which is used for vulcanizing rubber –
A.
Sulphur
B.
Bromine
C.
Silicon
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
[16] Which of the following is responsible for the extra strength of pyrex glass?
A.
Potassium Carbonate
B.
Lead Oxide
C.
Borax
D.
Ferric Oxide
Ans:
Borax
Explanation :
Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda-lime glass instead of borosilicate.
[17] Raw materials used for the manufacture of glass are –
A.
sand, soda, limestone
B.
sand, charcoal, soda
C.
limestone, charcoal, sulphur
D.
sand, sulphur, soda
Ans:
sand, soda, limestone
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion. It helps in reducing the deforestation as it arrests for cutting of trees for firewood.
[2] The most suitable vessel for storing concentrated sulphuric acid is –
A.
Copper vessel
B.
Aluminium vessel
C.
Glass vessel
D.
Earthen vessel
Ans:
Glass vessel
Explanation :
Concentrated Sulfuric acid can only be stored in glass, no metal lids, some plastic containers. It will attack anything organic, causing severe burns, the good thing is it will not start a fire but if it goes into contact with a metal it may generate hydrogen gas, an explosion risk.
[3] The radioactive element used in heart pacemakers is –
A.
Uranium
B.
Deuterium
C.
Plutonium
D.
Radium
Ans:
Uranium
Explanation :
The actinides (or actinoids) are the chemical elements with atomic numbers between 90 and 109 inclusively. They occur between Groups 3 and 4 in Period 7 of the periodic table. All elements in this family are radioactive. Five actinides namely: thorium, protoactinium, uranium, neptunium, and plutonium have been found in nature. Plutonium is used in the manufacture of nuclear weapons and as the power source in nuclear power plants. On a smaller scale, it is also used as a power source in smaller devices such as the heart pacemaker.
[4] The element which is commonly used in nuclear for producing electricity by nuclear fission is –
A.
Radium
B.
Plutonium
C.
Uranium
D.
Deuterium
Ans:
Uranium
Explanation :
Uranium is used to produce a chemical and nuclear reaction which makes a lot of heat. This heat is used to turn water into steam, which turns turbines...turbines generate electricity.
[5] Which amidst the following is not a gem stone?
A.
Cat's-eye
B.
Topaz
C.
Opal
D.
Pearl
Ans:
Cat's-eye
Explanation :
A gemstone or gem (also called a precious or semi-precious stone, a fine gem, or jewel) is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments.
[6] Which of the following vegetable oils does not contain essential fatty acids?
A.
Sunflower oil
B.
Mustard oil
C.
Coconut oil
D.
Gmundnut oil
Ans:
Sunflower oil
Explanation :
Fatty Acids are aliphatic carboxylic acid with varying hydrocarbon lengths at one end of the chain joined to terminal carboxyl (-COOH) group at the other end.
[7] Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes?
A.
Borax
B.
Saltpetre
C.
Hydrogen peroxide
D.
Sodium chloride
Ans:
Sodium chloride
Explanation :
Antiseptics are antimicrobial substances that are applied to living tissue/skin to reduce the possibility of infection, sepsis, or putrefaction. Antiseptics are generally distinguished from antibiotics by the latter's ability to be transported through the lymphatic system to destroy bacteria within the body, and from disinfectants, which destroy microorganisms found on non-living objects.
[8] Which one of the following is used to restore the colour of old oil-paintings?
A.
Ozone
B.
Hydrogen peroxide
C.
Barium peroxide
D.
Sodium peroxide
Ans:
Hydrogen peroxide
Explanation :
Hydrogen peroxide (H2O2) is the simplest peroxide (a compound with an oxygen-oxygen single bond). It is also a strong oxidizer. Hydrogen peroxide is a clear liquid, slightly more viscous than water. In dilute solution, it appears colourless. Due to its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent. The oxidizing capacity of hydrogen peroxide is so strong that it is considered a highly reactive oxygen species.
[9] A mixture of benzene and toluene forms -
A.
Non-ideal solution
B.
Ideal solution
C.
Emulsion
D.
Suspension
Ans:
Ideal solution
Explanation :
A mixture of benzene and toluene (60 mole% toluene) enters a distillation column to be separated into two product streams.
[10] The aqueous solution of which acids is called Vinegar -
A.
Citric acid
B.
Hydrochloric acid
C.
Acetic acid
D.
Oxalic acid
Ans:
Acetic acid
Explanation :
Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. Vinegar typically contains 5–20% acetic acid by volume.
[11] What happens to its potential energy when an object is taken to high altitude?
A.
Its potential energy increases
B.
Its potential energy decreases
C.
Its potential energy remain same
D.
None of the above
Ans:
Its potential energy increases
Explanation :
When an object is taken to high altitude its potential energy increases.
[12] Which one of the following noble gases is not found in the atmosphere?
A.
Argon
B.
Krypton
C.
Radon
D.
Xenon
Ans:
Radon
Explanation :
All the noble gases are present in Earth's atmosphere and, except for helium and radon, their major commercial source is the air, from which they are obtained by liquefaction and fractional distillation.
[13] The fuel used in an atomic reactor is –
A.
Coal
B.
Petrol
C.
Combustable gases
D.
Uranium
Ans:
Uranium
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators. Some produce isotopes for medical and industrial use, and some are run only for research.
[14] Mortar is a mixture of water sand and –
A.
Slaked lime
B.
Quick lime
C.
Limestone
D.
Gypsum
Ans:
Slaked lime
Explanation :
Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone, brick, cinder blocks, etc. Mortar becomes hard when it sets, resulting in a rigid aggregate structure. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime (slaked), and water. Mortar can also be used to fix, or point, masonry when the original mortar has washed away.
[15] The element which is used for vulcanizing rubber –
A.
Sulphur
B.
Bromine
C.
Silicon
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
[16] Which of the following is responsible for the extra strength of pyrex glass?
A.
Potassium Carbonate
B.
Lead Oxide
C.
Borax
D.
Ferric Oxide
Ans:
Borax
Explanation :
Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda-lime glass instead of borosilicate.
[17] Raw materials used for the manufacture of glass are –
A.
sand, soda, limestone
B.
sand, charcoal, soda
C.
limestone, charcoal, sulphur
D.
sand, sulphur, soda
Ans:
sand, soda, limestone
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
The actinides (or actinoids) are the chemical elements with atomic numbers between 90 and 109 inclusively. They occur between Groups 3 and 4 in Period 7 of the periodic table. All elements in this family are radioactive. Five actinides namely: thorium, protoactinium, uranium, neptunium, and plutonium have been found in nature. Plutonium is used in the manufacture of nuclear weapons and as the power source in nuclear power plants. On a smaller scale, it is also used as a power source in smaller devices such as the heart pacemaker.
[4] The element which is commonly used in nuclear for producing electricity by nuclear fission is –
A.
Radium
B.
Plutonium
C.
Uranium
D.
Deuterium
Ans:
Uranium
Explanation :
Uranium is used to produce a chemical and nuclear reaction which makes a lot of heat. This heat is used to turn water into steam, which turns turbines...turbines generate electricity.
[5] Which amidst the following is not a gem stone?
A.
Cat's-eye
B.
Topaz
C.
Opal
D.
Pearl
Ans:
Cat's-eye
Explanation :
A gemstone or gem (also called a precious or semi-precious stone, a fine gem, or jewel) is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments.
[6] Which of the following vegetable oils does not contain essential fatty acids?
A.
Sunflower oil
B.
Mustard oil
C.
Coconut oil
D.
Gmundnut oil
Ans:
Sunflower oil
Explanation :
Fatty Acids are aliphatic carboxylic acid with varying hydrocarbon lengths at one end of the chain joined to terminal carboxyl (-COOH) group at the other end.
[7] Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes?
A.
Borax
B.
Saltpetre
C.
Hydrogen peroxide
D.
Sodium chloride
Ans:
Sodium chloride
Explanation :
Antiseptics are antimicrobial substances that are applied to living tissue/skin to reduce the possibility of infection, sepsis, or putrefaction. Antiseptics are generally distinguished from antibiotics by the latter's ability to be transported through the lymphatic system to destroy bacteria within the body, and from disinfectants, which destroy microorganisms found on non-living objects.
[8] Which one of the following is used to restore the colour of old oil-paintings?
A.
Ozone
B.
Hydrogen peroxide
C.
Barium peroxide
D.
Sodium peroxide
Ans:
Hydrogen peroxide
Explanation :
Hydrogen peroxide (H2O2) is the simplest peroxide (a compound with an oxygen-oxygen single bond). It is also a strong oxidizer. Hydrogen peroxide is a clear liquid, slightly more viscous than water. In dilute solution, it appears colourless. Due to its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent. The oxidizing capacity of hydrogen peroxide is so strong that it is considered a highly reactive oxygen species.
[9] A mixture of benzene and toluene forms -
A.
Non-ideal solution
B.
Ideal solution
C.
Emulsion
D.
Suspension
Ans:
Ideal solution
Explanation :
A mixture of benzene and toluene (60 mole% toluene) enters a distillation column to be separated into two product streams.
[10] The aqueous solution of which acids is called Vinegar -
A.
Citric acid
B.
Hydrochloric acid
C.
Acetic acid
D.
Oxalic acid
Ans:
Acetic acid
Explanation :
Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. Vinegar typically contains 5–20% acetic acid by volume.
[11] What happens to its potential energy when an object is taken to high altitude?
A.
Its potential energy increases
B.
Its potential energy decreases
C.
Its potential energy remain same
D.
None of the above
Ans:
Its potential energy increases
Explanation :
When an object is taken to high altitude its potential energy increases.
[12] Which one of the following noble gases is not found in the atmosphere?
A.
Argon
B.
Krypton
C.
Radon
D.
Xenon
Ans:
Radon
Explanation :
All the noble gases are present in Earth's atmosphere and, except for helium and radon, their major commercial source is the air, from which they are obtained by liquefaction and fractional distillation.
[13] The fuel used in an atomic reactor is –
A.
Coal
B.
Petrol
C.
Combustable gases
D.
Uranium
Ans:
Uranium
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators. Some produce isotopes for medical and industrial use, and some are run only for research.
[14] Mortar is a mixture of water sand and –
A.
Slaked lime
B.
Quick lime
C.
Limestone
D.
Gypsum
Ans:
Slaked lime
Explanation :
Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone, brick, cinder blocks, etc. Mortar becomes hard when it sets, resulting in a rigid aggregate structure. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime (slaked), and water. Mortar can also be used to fix, or point, masonry when the original mortar has washed away.
[15] The element which is used for vulcanizing rubber –
A.
Sulphur
B.
Bromine
C.
Silicon
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
[16] Which of the following is responsible for the extra strength of pyrex glass?
A.
Potassium Carbonate
B.
Lead Oxide
C.
Borax
D.
Ferric Oxide
Ans:
Borax
Explanation :
Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda-lime glass instead of borosilicate.
[17] Raw materials used for the manufacture of glass are –
A.
sand, soda, limestone
B.
sand, charcoal, soda
C.
limestone, charcoal, sulphur
D.
sand, sulphur, soda
Ans:
sand, soda, limestone
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
A gemstone or gem (also called a precious or semi-precious stone, a fine gem, or jewel) is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments.
[6] Which of the following vegetable oils does not contain essential fatty acids?
A.
Sunflower oil
B.
Mustard oil
C.
Coconut oil
D.
Gmundnut oil
Ans:
Sunflower oil
Explanation :
Fatty Acids are aliphatic carboxylic acid with varying hydrocarbon lengths at one end of the chain joined to terminal carboxyl (-COOH) group at the other end.
[7] Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes?
A.
Borax
B.
Saltpetre
C.
Hydrogen peroxide
D.
Sodium chloride
Ans:
Sodium chloride
Explanation :
Antiseptics are antimicrobial substances that are applied to living tissue/skin to reduce the possibility of infection, sepsis, or putrefaction. Antiseptics are generally distinguished from antibiotics by the latter's ability to be transported through the lymphatic system to destroy bacteria within the body, and from disinfectants, which destroy microorganisms found on non-living objects.
[8] Which one of the following is used to restore the colour of old oil-paintings?
A.
Ozone
B.
Hydrogen peroxide
C.
Barium peroxide
D.
Sodium peroxide
Ans:
Hydrogen peroxide
Explanation :
Hydrogen peroxide (H2O2) is the simplest peroxide (a compound with an oxygen-oxygen single bond). It is also a strong oxidizer. Hydrogen peroxide is a clear liquid, slightly more viscous than water. In dilute solution, it appears colourless. Due to its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent. The oxidizing capacity of hydrogen peroxide is so strong that it is considered a highly reactive oxygen species.
[9] A mixture of benzene and toluene forms -
A.
Non-ideal solution
B.
Ideal solution
C.
Emulsion
D.
Suspension
Ans:
Ideal solution
Explanation :
A mixture of benzene and toluene (60 mole% toluene) enters a distillation column to be separated into two product streams.
[10] The aqueous solution of which acids is called Vinegar -
A.
Citric acid
B.
Hydrochloric acid
C.
Acetic acid
D.
Oxalic acid
Ans:
Acetic acid
Explanation :
Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. Vinegar typically contains 5–20% acetic acid by volume.
[11] What happens to its potential energy when an object is taken to high altitude?
A.
Its potential energy increases
B.
Its potential energy decreases
C.
Its potential energy remain same
D.
None of the above
Ans:
Its potential energy increases
Explanation :
When an object is taken to high altitude its potential energy increases.
[12] Which one of the following noble gases is not found in the atmosphere?
A.
Argon
B.
Krypton
C.
Radon
D.
Xenon
Ans:
Radon
Explanation :
All the noble gases are present in Earth's atmosphere and, except for helium and radon, their major commercial source is the air, from which they are obtained by liquefaction and fractional distillation.
[13] The fuel used in an atomic reactor is –
A.
Coal
B.
Petrol
C.
Combustable gases
D.
Uranium
Ans:
Uranium
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators. Some produce isotopes for medical and industrial use, and some are run only for research.
[14] Mortar is a mixture of water sand and –
A.
Slaked lime
B.
Quick lime
C.
Limestone
D.
Gypsum
Ans:
Slaked lime
Explanation :
Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone, brick, cinder blocks, etc. Mortar becomes hard when it sets, resulting in a rigid aggregate structure. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime (slaked), and water. Mortar can also be used to fix, or point, masonry when the original mortar has washed away.
[15] The element which is used for vulcanizing rubber –
A.
Sulphur
B.
Bromine
C.
Silicon
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
[16] Which of the following is responsible for the extra strength of pyrex glass?
A.
Potassium Carbonate
B.
Lead Oxide
C.
Borax
D.
Ferric Oxide
Ans:
Borax
Explanation :
Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda-lime glass instead of borosilicate.
[17] Raw materials used for the manufacture of glass are –
A.
sand, soda, limestone
B.
sand, charcoal, soda
C.
limestone, charcoal, sulphur
D.
sand, sulphur, soda
Ans:
sand, soda, limestone
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
Antiseptics are antimicrobial substances that are applied to living tissue/skin to reduce the possibility of infection, sepsis, or putrefaction. Antiseptics are generally distinguished from antibiotics by the latter's ability to be transported through the lymphatic system to destroy bacteria within the body, and from disinfectants, which destroy microorganisms found on non-living objects.
[8] Which one of the following is used to restore the colour of old oil-paintings?
A.
Ozone
B.
Hydrogen peroxide
C.
Barium peroxide
D.
Sodium peroxide
Ans:
Hydrogen peroxide
Explanation :
Hydrogen peroxide (H2O2) is the simplest peroxide (a compound with an oxygen-oxygen single bond). It is also a strong oxidizer. Hydrogen peroxide is a clear liquid, slightly more viscous than water. In dilute solution, it appears colourless. Due to its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent. The oxidizing capacity of hydrogen peroxide is so strong that it is considered a highly reactive oxygen species.
[9] A mixture of benzene and toluene forms -
A.
Non-ideal solution
B.
Ideal solution
C.
Emulsion
D.
Suspension
Ans:
Ideal solution
Explanation :
A mixture of benzene and toluene (60 mole% toluene) enters a distillation column to be separated into two product streams.
[10] The aqueous solution of which acids is called Vinegar -
A.
Citric acid
B.
Hydrochloric acid
C.
Acetic acid
D.
Oxalic acid
Ans:
Acetic acid
Explanation :
Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. Vinegar typically contains 5–20% acetic acid by volume.
[11] What happens to its potential energy when an object is taken to high altitude?
A.
Its potential energy increases
B.
Its potential energy decreases
C.
Its potential energy remain same
D.
None of the above
Ans:
Its potential energy increases
Explanation :
When an object is taken to high altitude its potential energy increases.
[12] Which one of the following noble gases is not found in the atmosphere?
A.
Argon
B.
Krypton
C.
Radon
D.
Xenon
Ans:
Radon
Explanation :
All the noble gases are present in Earth's atmosphere and, except for helium and radon, their major commercial source is the air, from which they are obtained by liquefaction and fractional distillation.
[13] The fuel used in an atomic reactor is –
A.
Coal
B.
Petrol
C.
Combustable gases
D.
Uranium
Ans:
Uranium
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators. Some produce isotopes for medical and industrial use, and some are run only for research.
[14] Mortar is a mixture of water sand and –
A.
Slaked lime
B.
Quick lime
C.
Limestone
D.
Gypsum
Ans:
Slaked lime
Explanation :
Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone, brick, cinder blocks, etc. Mortar becomes hard when it sets, resulting in a rigid aggregate structure. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime (slaked), and water. Mortar can also be used to fix, or point, masonry when the original mortar has washed away.
[15] The element which is used for vulcanizing rubber –
A.
Sulphur
B.
Bromine
C.
Silicon
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
[16] Which of the following is responsible for the extra strength of pyrex glass?
A.
Potassium Carbonate
B.
Lead Oxide
C.
Borax
D.
Ferric Oxide
Ans:
Borax
Explanation :
Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda-lime glass instead of borosilicate.
[17] Raw materials used for the manufacture of glass are –
A.
sand, soda, limestone
B.
sand, charcoal, soda
C.
limestone, charcoal, sulphur
D.
sand, sulphur, soda
Ans:
sand, soda, limestone
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
A mixture of benzene and toluene (60 mole% toluene) enters a distillation column to be separated into two product streams.
[10] The aqueous solution of which acids is called Vinegar -
A.
Citric acid
B.
Hydrochloric acid
C.
Acetic acid
D.
Oxalic acid
Ans:
Acetic acid
Explanation :
Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. Vinegar typically contains 5–20% acetic acid by volume.
[11] What happens to its potential energy when an object is taken to high altitude?
A.
Its potential energy increases
B.
Its potential energy decreases
C.
Its potential energy remain same
D.
None of the above
Ans:
Its potential energy increases
Explanation :
When an object is taken to high altitude its potential energy increases.
[12] Which one of the following noble gases is not found in the atmosphere?
A.
Argon
B.
Krypton
C.
Radon
D.
Xenon
Ans:
Radon
Explanation :
All the noble gases are present in Earth's atmosphere and, except for helium and radon, their major commercial source is the air, from which they are obtained by liquefaction and fractional distillation.
[13] The fuel used in an atomic reactor is –
A.
Coal
B.
Petrol
C.
Combustable gases
D.
Uranium
Ans:
Uranium
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators. Some produce isotopes for medical and industrial use, and some are run only for research.
[14] Mortar is a mixture of water sand and –
A.
Slaked lime
B.
Quick lime
C.
Limestone
D.
Gypsum
Ans:
Slaked lime
Explanation :
Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone, brick, cinder blocks, etc. Mortar becomes hard when it sets, resulting in a rigid aggregate structure. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime (slaked), and water. Mortar can also be used to fix, or point, masonry when the original mortar has washed away.
[15] The element which is used for vulcanizing rubber –
A.
Sulphur
B.
Bromine
C.
Silicon
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
[16] Which of the following is responsible for the extra strength of pyrex glass?
A.
Potassium Carbonate
B.
Lead Oxide
C.
Borax
D.
Ferric Oxide
Ans:
Borax
Explanation :
Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda-lime glass instead of borosilicate.
[17] Raw materials used for the manufacture of glass are –
A.
sand, soda, limestone
B.
sand, charcoal, soda
C.
limestone, charcoal, sulphur
D.
sand, sulphur, soda
Ans:
sand, soda, limestone
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
When an object is taken to high altitude its potential energy increases.
[12] Which one of the following noble gases is not found in the atmosphere?
A.
Argon
B.
Krypton
C.
Radon
D.
Xenon
Ans:
Radon
Explanation :
All the noble gases are present in Earth's atmosphere and, except for helium and radon, their major commercial source is the air, from which they are obtained by liquefaction and fractional distillation.
[13] The fuel used in an atomic reactor is –
A.
Coal
B.
Petrol
C.
Combustable gases
D.
Uranium
Ans:
Uranium
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators. Some produce isotopes for medical and industrial use, and some are run only for research.
[14] Mortar is a mixture of water sand and –
A.
Slaked lime
B.
Quick lime
C.
Limestone
D.
Gypsum
Ans:
Slaked lime
Explanation :
Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone, brick, cinder blocks, etc. Mortar becomes hard when it sets, resulting in a rigid aggregate structure. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime (slaked), and water. Mortar can also be used to fix, or point, masonry when the original mortar has washed away.
[15] The element which is used for vulcanizing rubber –
A.
Sulphur
B.
Bromine
C.
Silicon
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
[16] Which of the following is responsible for the extra strength of pyrex glass?
A.
Potassium Carbonate
B.
Lead Oxide
C.
Borax
D.
Ferric Oxide
Ans:
Borax
Explanation :
Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda-lime glass instead of borosilicate.
[17] Raw materials used for the manufacture of glass are –
A.
sand, soda, limestone
B.
sand, charcoal, soda
C.
limestone, charcoal, sulphur
D.
sand, sulphur, soda
Ans:
sand, soda, limestone
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators. Some produce isotopes for medical and industrial use, and some are run only for research.
[14] Mortar is a mixture of water sand and –
A.
Slaked lime
B.
Quick lime
C.
Limestone
D.
Gypsum
Ans:
Slaked lime
Explanation :
Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone, brick, cinder blocks, etc. Mortar becomes hard when it sets, resulting in a rigid aggregate structure. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime (slaked), and water. Mortar can also be used to fix, or point, masonry when the original mortar has washed away.
[15] The element which is used for vulcanizing rubber –
A.
Sulphur
B.
Bromine
C.
Silicon
D.
Phosphorus
Ans:
Sulphur
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
[16] Which of the following is responsible for the extra strength of pyrex glass?
A.
Potassium Carbonate
B.
Lead Oxide
C.
Borax
D.
Ferric Oxide
Ans:
Borax
Explanation :
Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda-lime glass instead of borosilicate.
[17] Raw materials used for the manufacture of glass are –
A.
sand, soda, limestone
B.
sand, charcoal, soda
C.
limestone, charcoal, sulphur
D.
sand, sulphur, soda
Ans:
sand, soda, limestone
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
[16] Which of the following is responsible for the extra strength of pyrex glass?
A.
Potassium Carbonate
B.
Lead Oxide
C.
Borax
D.
Ferric Oxide
Ans:
Borax
Explanation :
Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda-lime glass instead of borosilicate.
[17] Raw materials used for the manufacture of glass are –
A.
sand, soda, limestone
B.
sand, charcoal, soda
C.
limestone, charcoal, sulphur
D.
sand, sulphur, soda
Ans:
sand, soda, limestone
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special applications, it is not very common due to its high glass transition temperature of over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.
[18] Which of the following is used in welding broken pieces of iron rails and machine parts?
A.
Aluminium sulphate
B.
Solder
C.
Aluminium powder
D.
None of the above
Ans:
Aluminium powder
Explanation :
Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays.
[19] Stainless steel is usually made by alloying the steel with –
A.
copper and nickel
B.
copper and chromium
C.
chromium and nickel
D.
manganese and copper
Ans:
chromium and nickel
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10.5 per cent to 11 per cent chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added.
[20] Which one of the following organic compound is used to remove stains of iron compounds?
A.
Oxalic acid
B.
Benzoic acid
C.
Phthalic acid
D.
Cinnamic acid
Ans:
Oxalic acid
Explanation :
Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion.
[21] Which one of the following pairs is NOT correctly matched?
A.
Haematite : Copper
B.
Bauxite : Aluminium
C.
Monazite : Thorium
D.
Pitchblende : Uranium
Ans:
Haematite : Copper
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
Haematite is the mineral form of iron oxide (Fe2O3), one of several iron oxides. It is mined as the main ore of iron. Hematite is harder than pure iron, but much more brittle.
[22] Which of the following is used for refrigeration?
A.
Sulphur dioxide
B.
Chlorine
C.
Freon
D.
Phosphine
Ans:
Freon
Explanation :
Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
[23] Electrons in the highest energy level of an atom are called _.
A.
valence protons
B.
orbital protons
C.
valence electrons
D.
orbital electrons
Ans:
valence electrons
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
[24] Bromine is-
A.
Colorless gas insoluble in water
B.
A highly inflammable gas
C.
A Black solid
D.
A red liquid
Ans:
A red liquid
Explanation :
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.
[25] Which is not a type of elements?
A.
Metals
B.
Non Metals
C.
Metalloids
D.
Gases
Ans:
Metalloids
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Explanation :
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.