[1] Activated Charcoal is used to remove colouring matter from pure substances by –
A.
Bleaching
B.
Oxidation
C.
Adsorption
D.
Reduction
Ans:
Adsorption
Explanation :
Heating wood to a very high temperature in the absence of air makes charcoal. When it is heated to an even higher temperature, about 930°C, impurities are driven from its surface and it becomes activated charcoal, sometimes called decolorizing charcoal. This activated charcoal can remove impurities in either the gaseous or liquid state from many solutions. It does so by the process of adsorption, or by attracting these molecules to the surface.
[2] Chernobyl disaster is the result of pollution by –
A.
Oil spill
B.
Acid rain
C.
Carbon dioxide
D.
Radioactive waste
Ans:
Radioactive waste
Explanation :
The Chernobyl disaster was a catastrophic nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the city of Pripyat, then located in the Ukrainian USSR. An explosion and fire released large quantities of radioactive particles into the atmosphere, which spread over much of the western USSR and Europe.
[3] Which one of the following elements exists in liquid state at room temperature?
A.
Mercury
B.
Lead
C.
Sodium
D.
Calcium
Ans:
Mercury
Explanation :
Mercury is a dense, silvery d-block element. It is the only metal that is liquid at standard conditions for temperature and pressure.
[4] Bone deformities occur due to excessive intake of:
A.
Phosphorus
B.
Potassium
C.
Fatty acid
D.
Fluorine
Ans:
Fluorine
Explanation :
Bone deformities occur due to excessive intake of Fluorine.
[5] The name of the scientist who discovered neutron is -
A.
Fermi
B.
Rutherford
C.
Chadwick
D.
Bohr
Ans:
Chadwick
Explanation :
Sir James Chadwick, CH, FRS (20 October 1891 – 24 July 1974) was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.
[6] Of the following commonly used materials, the one that is not an alloy is -
A.
Steel
B.
Brass
C.
Bronze
D.
Copper
Ans:
Copper
Explanation :
Copper is not an alloy; it is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. It is used as a constituent of various metal alloys, such as sterling silver used in jewellery, cupronickel used to make marine hardware and coins, and constant an used in strain gauges and thermo-couples for temperature measurement.
[7] Bronze is an alloy of –
A.
Copper & tin
B.
Copper & zinc
C.
Copper & iron
D.
Iron & nickel
Ans:
Copper & tin
Explanation :
Bronze is an alloy consisting primarily of copper, commonly with about 12% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon. These additions produce a range of alloys that may be harder than copper alone, or have other useful properties.
[8] Which acid is used in Lead storage batteiy?
A.
Sulphuric acid
B.
Nitric acid
C.
Hydrochlotic acid
D.
Acetic acid
Ans:
Sulphuric acid
Explanation :
Lead acid battery is a storage battery or secondary battery in which electrical energy can be stored as chemical energy and this chemical energy is then converted to electrical energy as when required. Lead- acid batteries are composed of a Lead-dioxide cathode, a sponge metallic Lead anode and a Sulphuric acid solution electrolyte.
[9] Ethanoic acid is commonly called -
A.
Acetic acid
B.
Sulphuric acid
C.
Sodium Ethoxide
D.
Ethyne
Ans:
Acetic acid
Explanation :
Ethanoic acid is commonly called acetic acid and belongs to a group of acids called carboxylic acids. 5- 8% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles.
[10] The bubbles in Chanmpagne and Soda are -
A.
Nitrogen
B.
Oxygen
C.
Carbon dioxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
0
[11] Which one is not metal?
A.
sulphar
B.
sugar
C.
nitrogen
D.
all
Ans:
all
Explanation :
A metal is a material (an element, compound, or alloy) that is typically hard, opaque, and shiny and has good electrical and thermal conductivity.
[12] What nucleus of atom contains?
A.
protons
B.
electrons
C.
electrons and protons
D.
protons and neutrons
Ans:
protons and neutrons
Explanation :
The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels.
[13] Which of the following caused radioactive pollution along the coast of Kerala?
A.
Plutonium
B.
Zinc
C.
Thorium
D.
Radium
Ans:
Thorium
Explanation :
Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium.
[14] For extinguishing fire, we use –
A.
Hydrogen
B.
Carbon Monoxide
C.
Carbon Dioxide
D.
Marsh has
Ans:
Carbon Dioxide
Explanation :
Fire extinguishers use carbon dioxide to displace the oxygen necessary for a fire to burn, extinguishing the blaze. Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire. It is useful for electrical fires and some flammable liquid fires, but may make some gasoline or paper fires worse by dispersing burning material.
[15] Which of the following metal has the lowest melting point?
A.
Lead
B.
Lithium
C.
Potassium
D.
Sodium
Ans:
Potassium
Explanation :
Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
[16] The main component of liquid bleach is:
A.
Sodium chloride
B.
Sodium hypochlorite
C.
Hydrochloric acid
D.
Sodium hypochlorate
Ans:
Sodium hypochlorite
Explanation :
Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength).
[17] The chemical used as a fixer in photography is -
A.
sodium thiosulphate
B.
sodium sulphate
C.
borax
D.
ammonium sulphate
Ans:
sodium thiosulphate
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Heating wood to a very high temperature in the absence of air makes charcoal. When it is heated to an even higher temperature, about 930°C, impurities are driven from its surface and it becomes activated charcoal, sometimes called decolorizing charcoal. This activated charcoal can remove impurities in either the gaseous or liquid state from many solutions. It does so by the process of adsorption, or by attracting these molecules to the surface.
[2] Chernobyl disaster is the result of pollution by –
A.
Oil spill
B.
Acid rain
C.
Carbon dioxide
D.
Radioactive waste
Ans:
Radioactive waste
Explanation :
The Chernobyl disaster was a catastrophic nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the city of Pripyat, then located in the Ukrainian USSR. An explosion and fire released large quantities of radioactive particles into the atmosphere, which spread over much of the western USSR and Europe.
[3] Which one of the following elements exists in liquid state at room temperature?
A.
Mercury
B.
Lead
C.
Sodium
D.
Calcium
Ans:
Mercury
Explanation :
Mercury is a dense, silvery d-block element. It is the only metal that is liquid at standard conditions for temperature and pressure.
[4] Bone deformities occur due to excessive intake of:
A.
Phosphorus
B.
Potassium
C.
Fatty acid
D.
Fluorine
Ans:
Fluorine
Explanation :
Bone deformities occur due to excessive intake of Fluorine.
[5] The name of the scientist who discovered neutron is -
A.
Fermi
B.
Rutherford
C.
Chadwick
D.
Bohr
Ans:
Chadwick
Explanation :
Sir James Chadwick, CH, FRS (20 October 1891 – 24 July 1974) was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.
[6] Of the following commonly used materials, the one that is not an alloy is -
A.
Steel
B.
Brass
C.
Bronze
D.
Copper
Ans:
Copper
Explanation :
Copper is not an alloy; it is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. It is used as a constituent of various metal alloys, such as sterling silver used in jewellery, cupronickel used to make marine hardware and coins, and constant an used in strain gauges and thermo-couples for temperature measurement.
[7] Bronze is an alloy of –
A.
Copper & tin
B.
Copper & zinc
C.
Copper & iron
D.
Iron & nickel
Ans:
Copper & tin
Explanation :
Bronze is an alloy consisting primarily of copper, commonly with about 12% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon. These additions produce a range of alloys that may be harder than copper alone, or have other useful properties.
[8] Which acid is used in Lead storage batteiy?
A.
Sulphuric acid
B.
Nitric acid
C.
Hydrochlotic acid
D.
Acetic acid
Ans:
Sulphuric acid
Explanation :
Lead acid battery is a storage battery or secondary battery in which electrical energy can be stored as chemical energy and this chemical energy is then converted to electrical energy as when required. Lead- acid batteries are composed of a Lead-dioxide cathode, a sponge metallic Lead anode and a Sulphuric acid solution electrolyte.
[9] Ethanoic acid is commonly called -
A.
Acetic acid
B.
Sulphuric acid
C.
Sodium Ethoxide
D.
Ethyne
Ans:
Acetic acid
Explanation :
Ethanoic acid is commonly called acetic acid and belongs to a group of acids called carboxylic acids. 5- 8% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles.
[10] The bubbles in Chanmpagne and Soda are -
A.
Nitrogen
B.
Oxygen
C.
Carbon dioxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
0
[11] Which one is not metal?
A.
sulphar
B.
sugar
C.
nitrogen
D.
all
Ans:
all
Explanation :
A metal is a material (an element, compound, or alloy) that is typically hard, opaque, and shiny and has good electrical and thermal conductivity.
[12] What nucleus of atom contains?
A.
protons
B.
electrons
C.
electrons and protons
D.
protons and neutrons
Ans:
protons and neutrons
Explanation :
The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels.
[13] Which of the following caused radioactive pollution along the coast of Kerala?
A.
Plutonium
B.
Zinc
C.
Thorium
D.
Radium
Ans:
Thorium
Explanation :
Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium.
[14] For extinguishing fire, we use –
A.
Hydrogen
B.
Carbon Monoxide
C.
Carbon Dioxide
D.
Marsh has
Ans:
Carbon Dioxide
Explanation :
Fire extinguishers use carbon dioxide to displace the oxygen necessary for a fire to burn, extinguishing the blaze. Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire. It is useful for electrical fires and some flammable liquid fires, but may make some gasoline or paper fires worse by dispersing burning material.
[15] Which of the following metal has the lowest melting point?
A.
Lead
B.
Lithium
C.
Potassium
D.
Sodium
Ans:
Potassium
Explanation :
Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
[16] The main component of liquid bleach is:
A.
Sodium chloride
B.
Sodium hypochlorite
C.
Hydrochloric acid
D.
Sodium hypochlorate
Ans:
Sodium hypochlorite
Explanation :
Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength).
[17] The chemical used as a fixer in photography is -
A.
sodium thiosulphate
B.
sodium sulphate
C.
borax
D.
ammonium sulphate
Ans:
sodium thiosulphate
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Mercury is a dense, silvery d-block element. It is the only metal that is liquid at standard conditions for temperature and pressure.
[4] Bone deformities occur due to excessive intake of:
A.
Phosphorus
B.
Potassium
C.
Fatty acid
D.
Fluorine
Ans:
Fluorine
Explanation :
Bone deformities occur due to excessive intake of Fluorine.
[5] The name of the scientist who discovered neutron is -
A.
Fermi
B.
Rutherford
C.
Chadwick
D.
Bohr
Ans:
Chadwick
Explanation :
Sir James Chadwick, CH, FRS (20 October 1891 – 24 July 1974) was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.
[6] Of the following commonly used materials, the one that is not an alloy is -
A.
Steel
B.
Brass
C.
Bronze
D.
Copper
Ans:
Copper
Explanation :
Copper is not an alloy; it is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. It is used as a constituent of various metal alloys, such as sterling silver used in jewellery, cupronickel used to make marine hardware and coins, and constant an used in strain gauges and thermo-couples for temperature measurement.
[7] Bronze is an alloy of –
A.
Copper & tin
B.
Copper & zinc
C.
Copper & iron
D.
Iron & nickel
Ans:
Copper & tin
Explanation :
Bronze is an alloy consisting primarily of copper, commonly with about 12% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon. These additions produce a range of alloys that may be harder than copper alone, or have other useful properties.
[8] Which acid is used in Lead storage batteiy?
A.
Sulphuric acid
B.
Nitric acid
C.
Hydrochlotic acid
D.
Acetic acid
Ans:
Sulphuric acid
Explanation :
Lead acid battery is a storage battery or secondary battery in which electrical energy can be stored as chemical energy and this chemical energy is then converted to electrical energy as when required. Lead- acid batteries are composed of a Lead-dioxide cathode, a sponge metallic Lead anode and a Sulphuric acid solution electrolyte.
[9] Ethanoic acid is commonly called -
A.
Acetic acid
B.
Sulphuric acid
C.
Sodium Ethoxide
D.
Ethyne
Ans:
Acetic acid
Explanation :
Ethanoic acid is commonly called acetic acid and belongs to a group of acids called carboxylic acids. 5- 8% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles.
[10] The bubbles in Chanmpagne and Soda are -
A.
Nitrogen
B.
Oxygen
C.
Carbon dioxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
0
[11] Which one is not metal?
A.
sulphar
B.
sugar
C.
nitrogen
D.
all
Ans:
all
Explanation :
A metal is a material (an element, compound, or alloy) that is typically hard, opaque, and shiny and has good electrical and thermal conductivity.
[12] What nucleus of atom contains?
A.
protons
B.
electrons
C.
electrons and protons
D.
protons and neutrons
Ans:
protons and neutrons
Explanation :
The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels.
[13] Which of the following caused radioactive pollution along the coast of Kerala?
A.
Plutonium
B.
Zinc
C.
Thorium
D.
Radium
Ans:
Thorium
Explanation :
Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium.
[14] For extinguishing fire, we use –
A.
Hydrogen
B.
Carbon Monoxide
C.
Carbon Dioxide
D.
Marsh has
Ans:
Carbon Dioxide
Explanation :
Fire extinguishers use carbon dioxide to displace the oxygen necessary for a fire to burn, extinguishing the blaze. Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire. It is useful for electrical fires and some flammable liquid fires, but may make some gasoline or paper fires worse by dispersing burning material.
[15] Which of the following metal has the lowest melting point?
A.
Lead
B.
Lithium
C.
Potassium
D.
Sodium
Ans:
Potassium
Explanation :
Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
[16] The main component of liquid bleach is:
A.
Sodium chloride
B.
Sodium hypochlorite
C.
Hydrochloric acid
D.
Sodium hypochlorate
Ans:
Sodium hypochlorite
Explanation :
Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength).
[17] The chemical used as a fixer in photography is -
A.
sodium thiosulphate
B.
sodium sulphate
C.
borax
D.
ammonium sulphate
Ans:
sodium thiosulphate
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Sir James Chadwick, CH, FRS (20 October 1891 – 24 July 1974) was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.
[6] Of the following commonly used materials, the one that is not an alloy is -
A.
Steel
B.
Brass
C.
Bronze
D.
Copper
Ans:
Copper
Explanation :
Copper is not an alloy; it is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. It is used as a constituent of various metal alloys, such as sterling silver used in jewellery, cupronickel used to make marine hardware and coins, and constant an used in strain gauges and thermo-couples for temperature measurement.
[7] Bronze is an alloy of –
A.
Copper & tin
B.
Copper & zinc
C.
Copper & iron
D.
Iron & nickel
Ans:
Copper & tin
Explanation :
Bronze is an alloy consisting primarily of copper, commonly with about 12% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon. These additions produce a range of alloys that may be harder than copper alone, or have other useful properties.
[8] Which acid is used in Lead storage batteiy?
A.
Sulphuric acid
B.
Nitric acid
C.
Hydrochlotic acid
D.
Acetic acid
Ans:
Sulphuric acid
Explanation :
Lead acid battery is a storage battery or secondary battery in which electrical energy can be stored as chemical energy and this chemical energy is then converted to electrical energy as when required. Lead- acid batteries are composed of a Lead-dioxide cathode, a sponge metallic Lead anode and a Sulphuric acid solution electrolyte.
[9] Ethanoic acid is commonly called -
A.
Acetic acid
B.
Sulphuric acid
C.
Sodium Ethoxide
D.
Ethyne
Ans:
Acetic acid
Explanation :
Ethanoic acid is commonly called acetic acid and belongs to a group of acids called carboxylic acids. 5- 8% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles.
[10] The bubbles in Chanmpagne and Soda are -
A.
Nitrogen
B.
Oxygen
C.
Carbon dioxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
0
[11] Which one is not metal?
A.
sulphar
B.
sugar
C.
nitrogen
D.
all
Ans:
all
Explanation :
A metal is a material (an element, compound, or alloy) that is typically hard, opaque, and shiny and has good electrical and thermal conductivity.
[12] What nucleus of atom contains?
A.
protons
B.
electrons
C.
electrons and protons
D.
protons and neutrons
Ans:
protons and neutrons
Explanation :
The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels.
[13] Which of the following caused radioactive pollution along the coast of Kerala?
A.
Plutonium
B.
Zinc
C.
Thorium
D.
Radium
Ans:
Thorium
Explanation :
Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium.
[14] For extinguishing fire, we use –
A.
Hydrogen
B.
Carbon Monoxide
C.
Carbon Dioxide
D.
Marsh has
Ans:
Carbon Dioxide
Explanation :
Fire extinguishers use carbon dioxide to displace the oxygen necessary for a fire to burn, extinguishing the blaze. Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire. It is useful for electrical fires and some flammable liquid fires, but may make some gasoline or paper fires worse by dispersing burning material.
[15] Which of the following metal has the lowest melting point?
A.
Lead
B.
Lithium
C.
Potassium
D.
Sodium
Ans:
Potassium
Explanation :
Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
[16] The main component of liquid bleach is:
A.
Sodium chloride
B.
Sodium hypochlorite
C.
Hydrochloric acid
D.
Sodium hypochlorate
Ans:
Sodium hypochlorite
Explanation :
Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength).
[17] The chemical used as a fixer in photography is -
A.
sodium thiosulphate
B.
sodium sulphate
C.
borax
D.
ammonium sulphate
Ans:
sodium thiosulphate
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Bronze is an alloy consisting primarily of copper, commonly with about 12% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon. These additions produce a range of alloys that may be harder than copper alone, or have other useful properties.
[8] Which acid is used in Lead storage batteiy?
A.
Sulphuric acid
B.
Nitric acid
C.
Hydrochlotic acid
D.
Acetic acid
Ans:
Sulphuric acid
Explanation :
Lead acid battery is a storage battery or secondary battery in which electrical energy can be stored as chemical energy and this chemical energy is then converted to electrical energy as when required. Lead- acid batteries are composed of a Lead-dioxide cathode, a sponge metallic Lead anode and a Sulphuric acid solution electrolyte.
[9] Ethanoic acid is commonly called -
A.
Acetic acid
B.
Sulphuric acid
C.
Sodium Ethoxide
D.
Ethyne
Ans:
Acetic acid
Explanation :
Ethanoic acid is commonly called acetic acid and belongs to a group of acids called carboxylic acids. 5- 8% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles.
[10] The bubbles in Chanmpagne and Soda are -
A.
Nitrogen
B.
Oxygen
C.
Carbon dioxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
0
[11] Which one is not metal?
A.
sulphar
B.
sugar
C.
nitrogen
D.
all
Ans:
all
Explanation :
A metal is a material (an element, compound, or alloy) that is typically hard, opaque, and shiny and has good electrical and thermal conductivity.
[12] What nucleus of atom contains?
A.
protons
B.
electrons
C.
electrons and protons
D.
protons and neutrons
Ans:
protons and neutrons
Explanation :
The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels.
[13] Which of the following caused radioactive pollution along the coast of Kerala?
A.
Plutonium
B.
Zinc
C.
Thorium
D.
Radium
Ans:
Thorium
Explanation :
Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium.
[14] For extinguishing fire, we use –
A.
Hydrogen
B.
Carbon Monoxide
C.
Carbon Dioxide
D.
Marsh has
Ans:
Carbon Dioxide
Explanation :
Fire extinguishers use carbon dioxide to displace the oxygen necessary for a fire to burn, extinguishing the blaze. Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire. It is useful for electrical fires and some flammable liquid fires, but may make some gasoline or paper fires worse by dispersing burning material.
[15] Which of the following metal has the lowest melting point?
A.
Lead
B.
Lithium
C.
Potassium
D.
Sodium
Ans:
Potassium
Explanation :
Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
[16] The main component of liquid bleach is:
A.
Sodium chloride
B.
Sodium hypochlorite
C.
Hydrochloric acid
D.
Sodium hypochlorate
Ans:
Sodium hypochlorite
Explanation :
Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength).
[17] The chemical used as a fixer in photography is -
A.
sodium thiosulphate
B.
sodium sulphate
C.
borax
D.
ammonium sulphate
Ans:
sodium thiosulphate
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Ethanoic acid is commonly called acetic acid and belongs to a group of acids called carboxylic acids. 5- 8% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles.
[10] The bubbles in Chanmpagne and Soda are -
A.
Nitrogen
B.
Oxygen
C.
Carbon dioxide
D.
Hydrogen
Ans:
Hydrogen
Explanation :
0
[11] Which one is not metal?
A.
sulphar
B.
sugar
C.
nitrogen
D.
all
Ans:
all
Explanation :
A metal is a material (an element, compound, or alloy) that is typically hard, opaque, and shiny and has good electrical and thermal conductivity.
[12] What nucleus of atom contains?
A.
protons
B.
electrons
C.
electrons and protons
D.
protons and neutrons
Ans:
protons and neutrons
Explanation :
The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels.
[13] Which of the following caused radioactive pollution along the coast of Kerala?
A.
Plutonium
B.
Zinc
C.
Thorium
D.
Radium
Ans:
Thorium
Explanation :
Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium.
[14] For extinguishing fire, we use –
A.
Hydrogen
B.
Carbon Monoxide
C.
Carbon Dioxide
D.
Marsh has
Ans:
Carbon Dioxide
Explanation :
Fire extinguishers use carbon dioxide to displace the oxygen necessary for a fire to burn, extinguishing the blaze. Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire. It is useful for electrical fires and some flammable liquid fires, but may make some gasoline or paper fires worse by dispersing burning material.
[15] Which of the following metal has the lowest melting point?
A.
Lead
B.
Lithium
C.
Potassium
D.
Sodium
Ans:
Potassium
Explanation :
Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
[16] The main component of liquid bleach is:
A.
Sodium chloride
B.
Sodium hypochlorite
C.
Hydrochloric acid
D.
Sodium hypochlorate
Ans:
Sodium hypochlorite
Explanation :
Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength).
[17] The chemical used as a fixer in photography is -
A.
sodium thiosulphate
B.
sodium sulphate
C.
borax
D.
ammonium sulphate
Ans:
sodium thiosulphate
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
A metal is a material (an element, compound, or alloy) that is typically hard, opaque, and shiny and has good electrical and thermal conductivity.
[12] What nucleus of atom contains?
A.
protons
B.
electrons
C.
electrons and protons
D.
protons and neutrons
Ans:
protons and neutrons
Explanation :
The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels.
[13] Which of the following caused radioactive pollution along the coast of Kerala?
A.
Plutonium
B.
Zinc
C.
Thorium
D.
Radium
Ans:
Thorium
Explanation :
Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium.
[14] For extinguishing fire, we use –
A.
Hydrogen
B.
Carbon Monoxide
C.
Carbon Dioxide
D.
Marsh has
Ans:
Carbon Dioxide
Explanation :
Fire extinguishers use carbon dioxide to displace the oxygen necessary for a fire to burn, extinguishing the blaze. Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire. It is useful for electrical fires and some flammable liquid fires, but may make some gasoline or paper fires worse by dispersing burning material.
[15] Which of the following metal has the lowest melting point?
A.
Lead
B.
Lithium
C.
Potassium
D.
Sodium
Ans:
Potassium
Explanation :
Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
[16] The main component of liquid bleach is:
A.
Sodium chloride
B.
Sodium hypochlorite
C.
Hydrochloric acid
D.
Sodium hypochlorate
Ans:
Sodium hypochlorite
Explanation :
Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength).
[17] The chemical used as a fixer in photography is -
A.
sodium thiosulphate
B.
sodium sulphate
C.
borax
D.
ammonium sulphate
Ans:
sodium thiosulphate
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium.
[14] For extinguishing fire, we use –
A.
Hydrogen
B.
Carbon Monoxide
C.
Carbon Dioxide
D.
Marsh has
Ans:
Carbon Dioxide
Explanation :
Fire extinguishers use carbon dioxide to displace the oxygen necessary for a fire to burn, extinguishing the blaze. Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire. It is useful for electrical fires and some flammable liquid fires, but may make some gasoline or paper fires worse by dispersing burning material.
[15] Which of the following metal has the lowest melting point?
A.
Lead
B.
Lithium
C.
Potassium
D.
Sodium
Ans:
Potassium
Explanation :
Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
[16] The main component of liquid bleach is:
A.
Sodium chloride
B.
Sodium hypochlorite
C.
Hydrochloric acid
D.
Sodium hypochlorate
Ans:
Sodium hypochlorite
Explanation :
Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength).
[17] The chemical used as a fixer in photography is -
A.
sodium thiosulphate
B.
sodium sulphate
C.
borax
D.
ammonium sulphate
Ans:
sodium thiosulphate
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C.
[16] The main component of liquid bleach is:
A.
Sodium chloride
B.
Sodium hypochlorite
C.
Hydrochloric acid
D.
Sodium hypochlorate
Ans:
Sodium hypochlorite
Explanation :
Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength).
[17] The chemical used as a fixer in photography is -
A.
sodium thiosulphate
B.
sodium sulphate
C.
borax
D.
ammonium sulphate
Ans:
sodium thiosulphate
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
[18] Which of the following is the most abundant metal on Earth's crust?
A.
Magnesium
B.
Iron
C.
Copper
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
[19] Which compound is formed when a Magnesium ribbon is burnt in air?
A.
Magnesium Nitrate
B.
Magnesium Carbonate
C.
Magnesium Oxide
D.
Magnesium Nitride
Ans:
Magnesium Oxide
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.
[20] Nuclear fission is caused by the impact of.
A.
Proton
B.
Electron
C.
Neutron
D.
Both (1) and
Ans:
Neutron
Explanation :
In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission.
[21] Interveinal necrotic spots on leaves appear due to –
A.
HF injuly
B.
SO2 injury
C.
NO2 injury
D.
O3 injury
Ans:
SO2 injury
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.
[22] The pollutant responsible for ozone holes is -
A.
CO2
B.
SO2
C.
CO
D.
CFC
Ans:
CFC
Explanation :
Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
[23] Atomic themy of matter was given by –
A.
Avogadro
B.
Dalton
C.
Newton
D.
Pascal
Ans:
Dalton
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
Democritus first suggested the existence of the atom, but John Dalton (1766-1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms.
[24] The major component in the LPG is -
A.
methane
B.
butane
C.
ethane
D.
propane
Ans:
butane
Explanation :
Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component.
[25] Which one of the following is not a 'green house gas'?
A.
Chlorofluorocarbons
B.
Methane
C.
Carbon dioxide
D.
Nitrogen
Ans:
Nitrogen
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.
Explanation :
The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2.