[1] The wine is prepared by the process of -
A.
fermentation
B.
catalysation
C.
conjugation
D.
displacement
Ans:
fermentation
Explanation :
Like lactic acid fermentation, alcoholic fermentation generates NAD+ so that glycolysis can continue to produce ATP. However, alcoholic fermentation in yeast produces ethyl alcohol instead of lactic acid as a waste product.
[2] Compounds with identical molecular formula but different structures are called -
A.
Tetravalent compounds
B.
Structural isomers
C.
Covalent compounds
D.
None of the above
Ans:
Structural isomers
Explanation :
Structures with identical molecular formula but different structures are called structural isomers. Eg: Butane.
[3] PVC is formed by polymerization of -
A.
Styrene
B.
Acetylene
C.
Propene
D.
Vinyl Chloride
Ans:
Vinyl Chloride
Explanation :
Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer (VCM). About 80% of production involves suspension polymerization.
[4] The unit to measure the flow of water is -
A.
Micro Mho
B.
Ohm meter
C.
Milli curie
D.
Cusecs
Ans:
Cusecs
Explanation :
The unit to measure the flow of water is cusecs. Cusecs is short form of Cubic feet per second.
[5] Which of the following metals occurs in free state?
A.
Copper
B.
Iron
C.
Zinc
D.
Lead
Ans:
Lead
Explanation :
A native metal is any metal that is found in its metallic form, either pure or as an alloy, in nature. Metals that can be found as native deposits singly and/ or in alloys include aluminium, antimony, arsenic, bismuth, cadmium, chromium, cobalt, indium, iron, nickel, selenium, tantalum, tellurium, tin, titanium, and zinc, as well as two groups of metals: the gold group, and the platinum group. The gold group consists of gold, copper, lead, aluminium, mercury, and silver
[6] Copper is refined by -
A.
roasting
B.
oxidation
C.
electrolysis
D.
zone refining
Ans:
roasting
Explanation :
Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals.
[7] What is the common name of CaOCI2?
A.
Baking Powder
B.
Baking Soda
C.
Bleaching Powder
D.
Washing Soda
Ans:
Bleaching Powder
Explanation :
Calcium hypochlorite, an inorganic compound with formula Ca(CIO)2, is commonly known as bleaching powder. It is not highly soluble in water and is more preferably used in soft to medium hard water.
[8] Rutherford’s scattering experiment proved the presence of -
A.
atoms in all matter
B.
electrons in atoms
C.
neutrons in atoms
D.
nucleusin atoms
Ans:
nucleusin atoms
Explanation :
Ernest Rutherford and his fellows Geiger and Marsden proved between 1911 and 1913 the existence of the atomic nucleus. This scattering experirnent led to the development of the Rutherford model (planetary model) of the atom, and eventually to the Bohr model.
[9] When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in -
A.
Raman spectra
B.
Absorption spectra
C.
Emission spectra
D.
Fluorescence
Ans:
Emission spectra
Explanation :
When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it gives off-the energy it absorbed in the form of light. The result of all these jumps is to produce what is called an emission spectrum. An emission spectrum is a set of coloured lines that correspond to the energy the electron has released at each stage °fits fall back to its original state.
[10] Haemoglobin has the highest affinity with which of the following?
A.
SO
B.
CO₂
C.
CO
D.
NO₂
Ans:
CO
Explanation :
0
[11] Which of the following gases is produced due to incomplete combustion of fuel?
A.
Carbon Dioxide
B.
Carbon Monoxide
C.
Methane
D.
Ethane
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide (CO) is an odorless, colorless gas formed by the incomplete com bustion of fuels. It is produced from the partial oxidation of carbon-containing com pounds; it forms when there is not enough oxygen to produce carbon dioxide.
[12] Acid used in an automobile battery?
A.
Sulphuric acid
B.
Hydrochloric acid
C.
Nitric acid
D.
Citric acid
Ans:
Sulphuric acid
Explanation :
Each cell of an automotive battery consists of alternate plates of lead (cathode) and (anode) immersed in an electrolyte of sulfuric acid solution.
[13] Which of the following is used as lubricant?
A.
Graphite
B.
Silica
C.
Diamond
D.
Iron Oxide
Ans:
Graphite
Explanation :
Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.
[14] Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–
A.
cone. HNO3 and cone. HCL
B.
conc. HNO3 and conc. H2SO4
C.
dil. HCl and dil. HNO3
D.
cone. HCl and cone. HNO3
Ans:
dil. HCl and dil. HNO3
Explanation :
Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.
[15] In deep-sea diving, divers use a mixture of gases consisting of oxygen and –
A.
hydrogen
B.
nitrogen
C.
argon
D.
helium
Ans:
nitrogen
Explanation :
Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
[16] Nucleons are regarded as composites sub-particles known as –
A.
Mesons
B.
Quarks
C.
Leptons
D.
Photons
Ans:
Quarks
Explanation :
In quantum chromodynamics, nucleons are regarded as composites of three quarks (elementary particles) and pions are composites of two quarks. According to EOB’s rules, nucleons move as fermions while pions move as bosons.
[17] Which of the following is not a greenhouse gas?
A.
Water vapour
B.
O2
C.
O3
D.
CO2
Ans:
O2
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
Like lactic acid fermentation, alcoholic fermentation generates NAD+ so that glycolysis can continue to produce ATP. However, alcoholic fermentation in yeast produces ethyl alcohol instead of lactic acid as a waste product.
[2] Compounds with identical molecular formula but different structures are called -
A.
Tetravalent compounds
B.
Structural isomers
C.
Covalent compounds
D.
None of the above
Ans:
Structural isomers
Explanation :
Structures with identical molecular formula but different structures are called structural isomers. Eg: Butane.
[3] PVC is formed by polymerization of -
A.
Styrene
B.
Acetylene
C.
Propene
D.
Vinyl Chloride
Ans:
Vinyl Chloride
Explanation :
Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer (VCM). About 80% of production involves suspension polymerization.
[4] The unit to measure the flow of water is -
A.
Micro Mho
B.
Ohm meter
C.
Milli curie
D.
Cusecs
Ans:
Cusecs
Explanation :
The unit to measure the flow of water is cusecs. Cusecs is short form of Cubic feet per second.
[5] Which of the following metals occurs in free state?
A.
Copper
B.
Iron
C.
Zinc
D.
Lead
Ans:
Lead
Explanation :
A native metal is any metal that is found in its metallic form, either pure or as an alloy, in nature. Metals that can be found as native deposits singly and/ or in alloys include aluminium, antimony, arsenic, bismuth, cadmium, chromium, cobalt, indium, iron, nickel, selenium, tantalum, tellurium, tin, titanium, and zinc, as well as two groups of metals: the gold group, and the platinum group. The gold group consists of gold, copper, lead, aluminium, mercury, and silver
[6] Copper is refined by -
A.
roasting
B.
oxidation
C.
electrolysis
D.
zone refining
Ans:
roasting
Explanation :
Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals.
[7] What is the common name of CaOCI2?
A.
Baking Powder
B.
Baking Soda
C.
Bleaching Powder
D.
Washing Soda
Ans:
Bleaching Powder
Explanation :
Calcium hypochlorite, an inorganic compound with formula Ca(CIO)2, is commonly known as bleaching powder. It is not highly soluble in water and is more preferably used in soft to medium hard water.
[8] Rutherford’s scattering experiment proved the presence of -
A.
atoms in all matter
B.
electrons in atoms
C.
neutrons in atoms
D.
nucleusin atoms
Ans:
nucleusin atoms
Explanation :
Ernest Rutherford and his fellows Geiger and Marsden proved between 1911 and 1913 the existence of the atomic nucleus. This scattering experirnent led to the development of the Rutherford model (planetary model) of the atom, and eventually to the Bohr model.
[9] When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in -
A.
Raman spectra
B.
Absorption spectra
C.
Emission spectra
D.
Fluorescence
Ans:
Emission spectra
Explanation :
When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it gives off-the energy it absorbed in the form of light. The result of all these jumps is to produce what is called an emission spectrum. An emission spectrum is a set of coloured lines that correspond to the energy the electron has released at each stage °fits fall back to its original state.
[10] Haemoglobin has the highest affinity with which of the following?
A.
SO
B.
CO₂
C.
CO
D.
NO₂
Ans:
CO
Explanation :
0
[11] Which of the following gases is produced due to incomplete combustion of fuel?
A.
Carbon Dioxide
B.
Carbon Monoxide
C.
Methane
D.
Ethane
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide (CO) is an odorless, colorless gas formed by the incomplete com bustion of fuels. It is produced from the partial oxidation of carbon-containing com pounds; it forms when there is not enough oxygen to produce carbon dioxide.
[12] Acid used in an automobile battery?
A.
Sulphuric acid
B.
Hydrochloric acid
C.
Nitric acid
D.
Citric acid
Ans:
Sulphuric acid
Explanation :
Each cell of an automotive battery consists of alternate plates of lead (cathode) and (anode) immersed in an electrolyte of sulfuric acid solution.
[13] Which of the following is used as lubricant?
A.
Graphite
B.
Silica
C.
Diamond
D.
Iron Oxide
Ans:
Graphite
Explanation :
Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.
[14] Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–
A.
cone. HNO3 and cone. HCL
B.
conc. HNO3 and conc. H2SO4
C.
dil. HCl and dil. HNO3
D.
cone. HCl and cone. HNO3
Ans:
dil. HCl and dil. HNO3
Explanation :
Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.
[15] In deep-sea diving, divers use a mixture of gases consisting of oxygen and –
A.
hydrogen
B.
nitrogen
C.
argon
D.
helium
Ans:
nitrogen
Explanation :
Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
[16] Nucleons are regarded as composites sub-particles known as –
A.
Mesons
B.
Quarks
C.
Leptons
D.
Photons
Ans:
Quarks
Explanation :
In quantum chromodynamics, nucleons are regarded as composites of three quarks (elementary particles) and pions are composites of two quarks. According to EOB’s rules, nucleons move as fermions while pions move as bosons.
[17] Which of the following is not a greenhouse gas?
A.
Water vapour
B.
O2
C.
O3
D.
CO2
Ans:
O2
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer (VCM). About 80% of production involves suspension polymerization.
[4] The unit to measure the flow of water is -
A.
Micro Mho
B.
Ohm meter
C.
Milli curie
D.
Cusecs
Ans:
Cusecs
Explanation :
The unit to measure the flow of water is cusecs. Cusecs is short form of Cubic feet per second.
[5] Which of the following metals occurs in free state?
A.
Copper
B.
Iron
C.
Zinc
D.
Lead
Ans:
Lead
Explanation :
A native metal is any metal that is found in its metallic form, either pure or as an alloy, in nature. Metals that can be found as native deposits singly and/ or in alloys include aluminium, antimony, arsenic, bismuth, cadmium, chromium, cobalt, indium, iron, nickel, selenium, tantalum, tellurium, tin, titanium, and zinc, as well as two groups of metals: the gold group, and the platinum group. The gold group consists of gold, copper, lead, aluminium, mercury, and silver
[6] Copper is refined by -
A.
roasting
B.
oxidation
C.
electrolysis
D.
zone refining
Ans:
roasting
Explanation :
Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals.
[7] What is the common name of CaOCI2?
A.
Baking Powder
B.
Baking Soda
C.
Bleaching Powder
D.
Washing Soda
Ans:
Bleaching Powder
Explanation :
Calcium hypochlorite, an inorganic compound with formula Ca(CIO)2, is commonly known as bleaching powder. It is not highly soluble in water and is more preferably used in soft to medium hard water.
[8] Rutherford’s scattering experiment proved the presence of -
A.
atoms in all matter
B.
electrons in atoms
C.
neutrons in atoms
D.
nucleusin atoms
Ans:
nucleusin atoms
Explanation :
Ernest Rutherford and his fellows Geiger and Marsden proved between 1911 and 1913 the existence of the atomic nucleus. This scattering experirnent led to the development of the Rutherford model (planetary model) of the atom, and eventually to the Bohr model.
[9] When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in -
A.
Raman spectra
B.
Absorption spectra
C.
Emission spectra
D.
Fluorescence
Ans:
Emission spectra
Explanation :
When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it gives off-the energy it absorbed in the form of light. The result of all these jumps is to produce what is called an emission spectrum. An emission spectrum is a set of coloured lines that correspond to the energy the electron has released at each stage °fits fall back to its original state.
[10] Haemoglobin has the highest affinity with which of the following?
A.
SO
B.
CO₂
C.
CO
D.
NO₂
Ans:
CO
Explanation :
0
[11] Which of the following gases is produced due to incomplete combustion of fuel?
A.
Carbon Dioxide
B.
Carbon Monoxide
C.
Methane
D.
Ethane
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide (CO) is an odorless, colorless gas formed by the incomplete com bustion of fuels. It is produced from the partial oxidation of carbon-containing com pounds; it forms when there is not enough oxygen to produce carbon dioxide.
[12] Acid used in an automobile battery?
A.
Sulphuric acid
B.
Hydrochloric acid
C.
Nitric acid
D.
Citric acid
Ans:
Sulphuric acid
Explanation :
Each cell of an automotive battery consists of alternate plates of lead (cathode) and (anode) immersed in an electrolyte of sulfuric acid solution.
[13] Which of the following is used as lubricant?
A.
Graphite
B.
Silica
C.
Diamond
D.
Iron Oxide
Ans:
Graphite
Explanation :
Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.
[14] Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–
A.
cone. HNO3 and cone. HCL
B.
conc. HNO3 and conc. H2SO4
C.
dil. HCl and dil. HNO3
D.
cone. HCl and cone. HNO3
Ans:
dil. HCl and dil. HNO3
Explanation :
Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.
[15] In deep-sea diving, divers use a mixture of gases consisting of oxygen and –
A.
hydrogen
B.
nitrogen
C.
argon
D.
helium
Ans:
nitrogen
Explanation :
Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
[16] Nucleons are regarded as composites sub-particles known as –
A.
Mesons
B.
Quarks
C.
Leptons
D.
Photons
Ans:
Quarks
Explanation :
In quantum chromodynamics, nucleons are regarded as composites of three quarks (elementary particles) and pions are composites of two quarks. According to EOB’s rules, nucleons move as fermions while pions move as bosons.
[17] Which of the following is not a greenhouse gas?
A.
Water vapour
B.
O2
C.
O3
D.
CO2
Ans:
O2
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
A native metal is any metal that is found in its metallic form, either pure or as an alloy, in nature. Metals that can be found as native deposits singly and/ or in alloys include aluminium, antimony, arsenic, bismuth, cadmium, chromium, cobalt, indium, iron, nickel, selenium, tantalum, tellurium, tin, titanium, and zinc, as well as two groups of metals: the gold group, and the platinum group. The gold group consists of gold, copper, lead, aluminium, mercury, and silver
[6] Copper is refined by -
A.
roasting
B.
oxidation
C.
electrolysis
D.
zone refining
Ans:
roasting
Explanation :
Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals.
[7] What is the common name of CaOCI2?
A.
Baking Powder
B.
Baking Soda
C.
Bleaching Powder
D.
Washing Soda
Ans:
Bleaching Powder
Explanation :
Calcium hypochlorite, an inorganic compound with formula Ca(CIO)2, is commonly known as bleaching powder. It is not highly soluble in water and is more preferably used in soft to medium hard water.
[8] Rutherford’s scattering experiment proved the presence of -
A.
atoms in all matter
B.
electrons in atoms
C.
neutrons in atoms
D.
nucleusin atoms
Ans:
nucleusin atoms
Explanation :
Ernest Rutherford and his fellows Geiger and Marsden proved between 1911 and 1913 the existence of the atomic nucleus. This scattering experirnent led to the development of the Rutherford model (planetary model) of the atom, and eventually to the Bohr model.
[9] When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in -
A.
Raman spectra
B.
Absorption spectra
C.
Emission spectra
D.
Fluorescence
Ans:
Emission spectra
Explanation :
When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it gives off-the energy it absorbed in the form of light. The result of all these jumps is to produce what is called an emission spectrum. An emission spectrum is a set of coloured lines that correspond to the energy the electron has released at each stage °fits fall back to its original state.
[10] Haemoglobin has the highest affinity with which of the following?
A.
SO
B.
CO₂
C.
CO
D.
NO₂
Ans:
CO
Explanation :
0
[11] Which of the following gases is produced due to incomplete combustion of fuel?
A.
Carbon Dioxide
B.
Carbon Monoxide
C.
Methane
D.
Ethane
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide (CO) is an odorless, colorless gas formed by the incomplete com bustion of fuels. It is produced from the partial oxidation of carbon-containing com pounds; it forms when there is not enough oxygen to produce carbon dioxide.
[12] Acid used in an automobile battery?
A.
Sulphuric acid
B.
Hydrochloric acid
C.
Nitric acid
D.
Citric acid
Ans:
Sulphuric acid
Explanation :
Each cell of an automotive battery consists of alternate plates of lead (cathode) and (anode) immersed in an electrolyte of sulfuric acid solution.
[13] Which of the following is used as lubricant?
A.
Graphite
B.
Silica
C.
Diamond
D.
Iron Oxide
Ans:
Graphite
Explanation :
Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.
[14] Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–
A.
cone. HNO3 and cone. HCL
B.
conc. HNO3 and conc. H2SO4
C.
dil. HCl and dil. HNO3
D.
cone. HCl and cone. HNO3
Ans:
dil. HCl and dil. HNO3
Explanation :
Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.
[15] In deep-sea diving, divers use a mixture of gases consisting of oxygen and –
A.
hydrogen
B.
nitrogen
C.
argon
D.
helium
Ans:
nitrogen
Explanation :
Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
[16] Nucleons are regarded as composites sub-particles known as –
A.
Mesons
B.
Quarks
C.
Leptons
D.
Photons
Ans:
Quarks
Explanation :
In quantum chromodynamics, nucleons are regarded as composites of three quarks (elementary particles) and pions are composites of two quarks. According to EOB’s rules, nucleons move as fermions while pions move as bosons.
[17] Which of the following is not a greenhouse gas?
A.
Water vapour
B.
O2
C.
O3
D.
CO2
Ans:
O2
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
Calcium hypochlorite, an inorganic compound with formula Ca(CIO)2, is commonly known as bleaching powder. It is not highly soluble in water and is more preferably used in soft to medium hard water.
[8] Rutherford’s scattering experiment proved the presence of -
A.
atoms in all matter
B.
electrons in atoms
C.
neutrons in atoms
D.
nucleusin atoms
Ans:
nucleusin atoms
Explanation :
Ernest Rutherford and his fellows Geiger and Marsden proved between 1911 and 1913 the existence of the atomic nucleus. This scattering experirnent led to the development of the Rutherford model (planetary model) of the atom, and eventually to the Bohr model.
[9] When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in -
A.
Raman spectra
B.
Absorption spectra
C.
Emission spectra
D.
Fluorescence
Ans:
Emission spectra
Explanation :
When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it gives off-the energy it absorbed in the form of light. The result of all these jumps is to produce what is called an emission spectrum. An emission spectrum is a set of coloured lines that correspond to the energy the electron has released at each stage °fits fall back to its original state.
[10] Haemoglobin has the highest affinity with which of the following?
A.
SO
B.
CO₂
C.
CO
D.
NO₂
Ans:
CO
Explanation :
0
[11] Which of the following gases is produced due to incomplete combustion of fuel?
A.
Carbon Dioxide
B.
Carbon Monoxide
C.
Methane
D.
Ethane
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide (CO) is an odorless, colorless gas formed by the incomplete com bustion of fuels. It is produced from the partial oxidation of carbon-containing com pounds; it forms when there is not enough oxygen to produce carbon dioxide.
[12] Acid used in an automobile battery?
A.
Sulphuric acid
B.
Hydrochloric acid
C.
Nitric acid
D.
Citric acid
Ans:
Sulphuric acid
Explanation :
Each cell of an automotive battery consists of alternate plates of lead (cathode) and (anode) immersed in an electrolyte of sulfuric acid solution.
[13] Which of the following is used as lubricant?
A.
Graphite
B.
Silica
C.
Diamond
D.
Iron Oxide
Ans:
Graphite
Explanation :
Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.
[14] Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–
A.
cone. HNO3 and cone. HCL
B.
conc. HNO3 and conc. H2SO4
C.
dil. HCl and dil. HNO3
D.
cone. HCl and cone. HNO3
Ans:
dil. HCl and dil. HNO3
Explanation :
Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.
[15] In deep-sea diving, divers use a mixture of gases consisting of oxygen and –
A.
hydrogen
B.
nitrogen
C.
argon
D.
helium
Ans:
nitrogen
Explanation :
Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
[16] Nucleons are regarded as composites sub-particles known as –
A.
Mesons
B.
Quarks
C.
Leptons
D.
Photons
Ans:
Quarks
Explanation :
In quantum chromodynamics, nucleons are regarded as composites of three quarks (elementary particles) and pions are composites of two quarks. According to EOB’s rules, nucleons move as fermions while pions move as bosons.
[17] Which of the following is not a greenhouse gas?
A.
Water vapour
B.
O2
C.
O3
D.
CO2
Ans:
O2
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it gives off-the energy it absorbed in the form of light. The result of all these jumps is to produce what is called an emission spectrum. An emission spectrum is a set of coloured lines that correspond to the energy the electron has released at each stage °fits fall back to its original state.
[10] Haemoglobin has the highest affinity with which of the following?
A.
SO
B.
CO₂
C.
CO
D.
NO₂
Ans:
CO
Explanation :
0
[11] Which of the following gases is produced due to incomplete combustion of fuel?
A.
Carbon Dioxide
B.
Carbon Monoxide
C.
Methane
D.
Ethane
Ans:
Carbon Monoxide
Explanation :
Carbon monoxide (CO) is an odorless, colorless gas formed by the incomplete com bustion of fuels. It is produced from the partial oxidation of carbon-containing com pounds; it forms when there is not enough oxygen to produce carbon dioxide.
[12] Acid used in an automobile battery?
A.
Sulphuric acid
B.
Hydrochloric acid
C.
Nitric acid
D.
Citric acid
Ans:
Sulphuric acid
Explanation :
Each cell of an automotive battery consists of alternate plates of lead (cathode) and (anode) immersed in an electrolyte of sulfuric acid solution.
[13] Which of the following is used as lubricant?
A.
Graphite
B.
Silica
C.
Diamond
D.
Iron Oxide
Ans:
Graphite
Explanation :
Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.
[14] Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–
A.
cone. HNO3 and cone. HCL
B.
conc. HNO3 and conc. H2SO4
C.
dil. HCl and dil. HNO3
D.
cone. HCl and cone. HNO3
Ans:
dil. HCl and dil. HNO3
Explanation :
Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.
[15] In deep-sea diving, divers use a mixture of gases consisting of oxygen and –
A.
hydrogen
B.
nitrogen
C.
argon
D.
helium
Ans:
nitrogen
Explanation :
Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
[16] Nucleons are regarded as composites sub-particles known as –
A.
Mesons
B.
Quarks
C.
Leptons
D.
Photons
Ans:
Quarks
Explanation :
In quantum chromodynamics, nucleons are regarded as composites of three quarks (elementary particles) and pions are composites of two quarks. According to EOB’s rules, nucleons move as fermions while pions move as bosons.
[17] Which of the following is not a greenhouse gas?
A.
Water vapour
B.
O2
C.
O3
D.
CO2
Ans:
O2
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
Carbon monoxide (CO) is an odorless, colorless gas formed by the incomplete com bustion of fuels. It is produced from the partial oxidation of carbon-containing com pounds; it forms when there is not enough oxygen to produce carbon dioxide.
[12] Acid used in an automobile battery?
A.
Sulphuric acid
B.
Hydrochloric acid
C.
Nitric acid
D.
Citric acid
Ans:
Sulphuric acid
Explanation :
Each cell of an automotive battery consists of alternate plates of lead (cathode) and (anode) immersed in an electrolyte of sulfuric acid solution.
[13] Which of the following is used as lubricant?
A.
Graphite
B.
Silica
C.
Diamond
D.
Iron Oxide
Ans:
Graphite
Explanation :
Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.
[14] Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–
A.
cone. HNO3 and cone. HCL
B.
conc. HNO3 and conc. H2SO4
C.
dil. HCl and dil. HNO3
D.
cone. HCl and cone. HNO3
Ans:
dil. HCl and dil. HNO3
Explanation :
Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.
[15] In deep-sea diving, divers use a mixture of gases consisting of oxygen and –
A.
hydrogen
B.
nitrogen
C.
argon
D.
helium
Ans:
nitrogen
Explanation :
Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
[16] Nucleons are regarded as composites sub-particles known as –
A.
Mesons
B.
Quarks
C.
Leptons
D.
Photons
Ans:
Quarks
Explanation :
In quantum chromodynamics, nucleons are regarded as composites of three quarks (elementary particles) and pions are composites of two quarks. According to EOB’s rules, nucleons move as fermions while pions move as bosons.
[17] Which of the following is not a greenhouse gas?
A.
Water vapour
B.
O2
C.
O3
D.
CO2
Ans:
O2
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.
[14] Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–
A.
cone. HNO3 and cone. HCL
B.
conc. HNO3 and conc. H2SO4
C.
dil. HCl and dil. HNO3
D.
cone. HCl and cone. HNO3
Ans:
dil. HCl and dil. HNO3
Explanation :
Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.
[15] In deep-sea diving, divers use a mixture of gases consisting of oxygen and –
A.
hydrogen
B.
nitrogen
C.
argon
D.
helium
Ans:
nitrogen
Explanation :
Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
[16] Nucleons are regarded as composites sub-particles known as –
A.
Mesons
B.
Quarks
C.
Leptons
D.
Photons
Ans:
Quarks
Explanation :
In quantum chromodynamics, nucleons are regarded as composites of three quarks (elementary particles) and pions are composites of two quarks. According to EOB’s rules, nucleons move as fermions while pions move as bosons.
[17] Which of the following is not a greenhouse gas?
A.
Water vapour
B.
O2
C.
O3
D.
CO2
Ans:
O2
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
[16] Nucleons are regarded as composites sub-particles known as –
A.
Mesons
B.
Quarks
C.
Leptons
D.
Photons
Ans:
Quarks
Explanation :
In quantum chromodynamics, nucleons are regarded as composites of three quarks (elementary particles) and pions are composites of two quarks. According to EOB’s rules, nucleons move as fermions while pions move as bosons.
[17] Which of the following is not a greenhouse gas?
A.
Water vapour
B.
O2
C.
O3
D.
CO2
Ans:
O2
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
[18] If Metal A displaces Metal B from its solution, then Metal A _.
A.
is more reactive than B
B.
is less reactive than B
C.
is heavier than B
D.
has the same reactivity as B
Ans:
is more reactive than B
Explanation :
0
[19] Who discovered electrons?
A.
Rutherford
B.
Niels Bohr
C.
JJ Thomson
D.
Newton
Ans:
JJ Thomson
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons.
[20] Which is also called Stranger Gas?
A.
Xenon
B.
Neon
C.
Argon
D.
Nitrous oxide
Ans:
Xenon
Explanation :
Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases.
[21] Silicon is an example of -
A.
A metal
B.
A non- metal
C.
A metalloid
D.
Both (2) and (3)
Ans:
A metalloid
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side.
[22] The “King of Metals” is :
A.
Gold
B.
Silver
C.
Iron
D.
Aluminium
Ans:
Gold
Explanation :
Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.
[23] The strongest oxidizing agent among the following is:
A.
Chlorine
B.
Iodine
C.
Fluorine
D.
Oxygen
Ans:
Fluorine
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
[24] A mixture of carbon monoxide and hydrogen is called -
A.
Producer gas
B.
Water gas
C.
Natural gas
D.
None
Ans:
Water gas
Explanation :
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
[25] In Nuclear reactors graphite is used as -
A.
Lubricant
B.
Fuel
C.
Linear of the reactor
D.
Modulator
Ans:
Modulator
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.
Explanation :
Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.