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- Question 1 of 50
1. Question
The purest form of water is:
Hint
Rainwater is considered the purest form of water available on the Earth. However, the rainwater we receive on earth is not necessarily pure, as it brings down impurities and particles present in the atmosphere along with it. Distilled Water is also pure from any contaminants, but it has no minerals in it as well.
- Question 2 of 50
2. Question
The main constituent of biogas is:
Hint
Raw biogas typically consists of methane (50–75%), carbon dioxide (25–50%), and smaller amounts of nitrogen (2–8%).
- Question 3 of 50
3. Question
Aspirin is chemically known as:
Hint
Aspirin is chemically known as acetylsalicylic acid. It is a common drug for relieving minor aches, pains, and fevers. People also use it as an anti-inflammatory or a blood thinner.
- Question 4 of 50
4. Question
The most abundant element in the human body is:
Hint
Oxygen is the most abundant element in the human body accounting for approximately 65% of a person’s mass. Each water molecule consists of two hydrogen atoms bonded to one oxygen atom, but the mass of each oxygen atom is much higher than the combined mass of the hydrogen.
- Question 5 of 50
5. Question
Which of the following is not a greenhouse gas?
Hint
The main gases responsible for the greenhouse effect include water vapor, carbon dioxide, methane, nitrous oxide, and water vapor (which all occur naturally), and fluorinated gases (which are synthetic) chlorofluorocarbons, hydrochlorofluorocarbons, hydrofluorocarbons, bromofluorocarbons (halons), perfluorcarbons, nitrogen trifluoride, and sulfur hexafluoride.
- Question 6 of 50
6. Question
Wax used for making candles is chemically a mixture of:
Hint
Wax used for making candles is chemically a mixture of aliphatic hydrocarbons. This means that it’s composed of compounds with a carbon backbone and hydrogen atoms that dangle off of the backbone. An aliphatic compound or aliphatic hydrocarbon contains hydrogen and carbon atoms linked together in straight chains.
- Question 7 of 50
7. Question
Litmus is obtained from:
Hint
Litmus is a water-soluble mixture of different dyes obtained from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity.
- Question 8 of 50
8. Question
Vinegar made by fermentation from cane sugar contains:
Hint
Vinegar made by fermentation from cane sugar contains acetic acid. Vinegar is an aqueous solution of acetic acid and trace compounds that may include flavorings. It typically contains 5–8% acetic acid by volume. Usually, the acetic acid is produced by a double fermentation, converting simple sugars to ethanol using yeast, and ethanol to acetic acid by acetic acid bacteria.
- Question 9 of 50
9. Question
Photooxidation process is initiated by:
Hint
Photo-oxidation process is initiated by light. The meaning of Photo-oxidation is oxidation under the influence of radiant energy (such as light). It is the degradation of a polymer surface due to the combined action of light and oxygen. It is the most significant factor in the weathering of plastics.
- Question 10 of 50
10. Question
Which one of the following is used in large quantities in Cement Industry?
Hint
Cement in different types is made mainly by calcining a mixture of about 75% limestone and 25% clay to form a calcium silicate clinker which is then ground and mixed with a small amount of gypsum.
- Question 11 of 50
11. Question
Ultraviolet radiation striking the earth is due to the depletion of:
Hint
Ultraviolet radiation striking the earth is due to the depletion of ozone. The ozone layer in the stratosphere absorbs a portion of the radiation from the sun, preventing it from reaching the planet’s surface. Most importantly, it absorbs the portion of UV light called UVB.
- Question 12 of 50
12. Question
Major gaseous pollutant of the thermal power station is:
Hint
Major gaseous pollutant of the thermal power station is SO2. Coal thermal power plants contribute to over half sulphur dioxide (SO2) concentration, 30 percent oxides of nitrogen (NOx), and 20 percent particulate matter (PM) in the ambient air.
- Question 13 of 50
13. Question
The process of removing calcium and magnesium from hard water is known as:
Hint
Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. It can be removed by using a water softener which works on the principle of ion exchange in which calcium and magnesium ions are exchanged with sodium or potassium ions, reducing the concentration of hardness minerals to tolerable levels.
- Question 14 of 50
14. Question
The tip of the match-stick contains:
Hint
The tip of the match-stick is made of an oxidizing agent such as potassium chlorate, mixed with sulfur, fillers and glass powder. The side of the box contains red phosphorus, binder and powdered glass.
- Question 15 of 50
15. Question
Match the following:
A. Formic acid 1. Lemon B. Citric acid 2. Tamarind C. Tartaric acid 3. Ants Hint
Lemon juice and lime juice are rich sources of citric acid. Tamarind (Tamarindus indica) possesses medicinal properties and has higher levels of tartaric acid, sugar, vitamin B, and calcium. The acid which ants produce is called methanoic acid or formic acid.
- Question 16 of 50
16. Question
Commercially, sodium bicarbonate is known as:
Hint
Commercially, sodium bicarbonate (NaHCO3) is known as Baking soda. It is a salt composed of a sodium cation and a bicarbonate anion. Baking soda is a leavening agent used in baked goods like cakes, muffins, and cookies.
- Question 17 of 50
17. Question
An emulsifier is an agent which:
Hint
An emulsifier is an agent which stabilises an emulsion. It is a compound or substance that acts as a stabiliser for emulsions, preventing liquids that ordinarily don’t mix from separating.
- Question 18 of 50
18. Question
Mortar is a mixture of water, sand and:
Hint
Mortar is a material used in building construction to bond brick, stone, tile, or concrete blocks into a structure. It is a mixture of water, sand and slaked lime. Slaked lime (Hydrated lime) formed by adding quick lime and water gives a slurry material.
- Question 19 of 50
19. Question
Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?
Hint
Inflammable gas is a gas that burns in the presence of an oxidant when provided with a source of ignition. inflammable gasses can include methane, acetylene, ammonia, hydrogen, propane, and propylene. The risk of a fire starting increases in relation to the amount of gas present.
- Question 20 of 50
20. Question
Which one of the following metals does not react with water to produce Hydrogen?
Hint
Cadmium does not react with water to produce Hydrogen. The alkali metals (Li, Na, K, Rb, Cs, and Fr) are the most reactive metals in the periodic table – they all react vigorously or even explosively with cold water, resulting in the displacement of hydrogen.
- Question 21 of 50
21. Question
Ozone consists of:
Hint
Ozone consists of oxygen only. It is a triatomic, molecule, consisting of three oxygen atoms. The formula for ozone is O3. Ozone in the upper atmosphere protects living organisms by preventing damaging ultraviolet light from reaching the Earth’s surface.
- Question 22 of 50
22. Question
Which of the following liquids has the least density?
Hint
Petrol has the least density among the given liquids. Mercury has a density of 13545.848 kg/m3, which is about 13.5 times denser than water (1000 kg/m3). Water is denser than petrol (800 kg/m3)
- Question 23 of 50
23. Question
One of the constituents of tear gas is:
Hint
Tear gas is a chemical compound that causes temporary skin, respiratory, and eye irritation. Chloropicrin (CCl3NO2) is one of the constituents of tear gas. Chloropicrin has been used in chemical warfare and as tear gas.
- Question 24 of 50
24. Question
An atomic clock is based on transitions in:
Hint
The atomic clock is based on transitions in Caesium. The caesium atomic clock is the most accurate type of clock yet developed. This device makes use of transitions between the spin states of the cesium nucleus and produces a frequency which is so regular that it has been adopted for establishing the time standard.
- Question 25 of 50
25. Question
What is the chemical name of vinegar?
Hint
Acetic acid (CH3COOH) is the chemical name of vinegar. A dilute solution of acetic acid produced by fermentation and oxidation of natural carbohydrates is called vinegar; a salt, ester, or acylal of acetic acid is called acetate.
- Question 26 of 50
26. Question
Which of the following is not a property of heavy water?
Hint
Heavy water (D2O) is water that contains heavy hydrogen – also known as deuterium – in place of regular hydrogen. The boiling point of heavy water (101.4°C ) is higher than that of ordinary water (100°C). The density of heavy water (1.11 g/cm³) is higher than that of ordinary water (1.00 g/cm³). The freezing point of heavy water (3.8°C) is higher than that of ordinary water (0°C).
- Question 27 of 50
27. Question
Silver halides are used in photographic plates because they are:
Hint
Silver halides are used in photographic plates because they are reduced by light. Silver halides are photosensitive as they react with light to form the image. A silver halide is a compound of silver and a halogen; for example, silver bromide (AgBr), silver chloride (AgCl), silver fluoride (AgF), and silver iodide (AgI).
- Question 28 of 50
28. Question
Tetraethyllead (TEL) is:
Hint
Tetraethyllead (TEL) is an antiknock compound with the formula Pb(C2H5)4. An antiknock agent is a gasoline additive used to reduce engine knocking and increase the fuel’s octane rating by raising the temperature and pressure at which auto-ignition occurs.
- Question 29 of 50
29. Question
Curie point is the temperature at which:
Hint
Curie point, also called Curie Temperature (TC) is the temperature at which certain magnetic materials lose their magnetic properties.
- Question 30 of 50
30. Question
The isotope used for the production of atomic energy is:
Hint
Uranium-235 (235U) is only found in about 0.7 percent of uranium found naturally, but it is well-suited for producing nuclear power. This is because it decays naturally by a process known as alpha radiation. This means that it releases an alpha particle (two neutrons and two protons connected together).
- Question 31 of 50
31. Question
Which of the following is not a nucleon?
Hint
Nucleons are protons and neutrons. They make up the atomic nucleus. The nucleus contains protons and neutrons along with some other particles such as alpha particles and beta particles. A proton is a subatomic particle having a positive electrical charge (+1). A positron is also a positively charged subatomic particle.
- Question 32 of 50
32. Question
The material used in the manufacture of lead pencil is:
Hint
There is no lead in pencils. The lead of the pencil contains a form of solid carbon known as graphite. It is a mix of finely ground graphite and clay powders.
- Question 33 of 50
33. Question
German silver, an alloy, does not contain the metal:
Hint
German silver, an alloy, does not contain the metal Silver. It is an alloy of copper, zinc and nickel, sometimes also containing lead and tin. It was originally named for its silver-white colour.
- Question 34 of 50
34. Question
Which substance is added to make natural rubber more strong and bouncy?
Hint
Sulphur is added to make natural rubber more strong and more bouncy. Vulcanization is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulphur, which results in three-dimensional cross-linking of the chain rubber molecules (polyisoprene) bonded to each other by sulfur atoms.
- Question 35 of 50
35. Question
Detergents are:
Hint
Detergents are Sodium salts of sulphonic acids. A detergent is a surfactant with cleansing properties when in dilute solutions. Detergents are the sodium salts of long-chain alkyl hydrogen sulphate or a long chain of benzene sulphonic acid.
- Question 36 of 50
36. Question
The noble gas used in radiotherapy is:
Hint
The noble gas used in radiotherapy is radon (Rn). Radon is a heavy radioactive gas of Group 18 (noble gases) of the periodic table, generated by the radioactive decay of radium.
- Question 37 of 50
37. Question
Steel contains:
Hint
Steel contains 0.1-2% carbon. Typically there is less than 0.40% carbon in most steels, though it is possible to have as much as 2%.
- Question 38 of 50
38. Question
The chemical(s) most commonly used for cloud seeding or ‘artificial rainmaking’ is/are:
Hint
The chemical(s) most commonly used for cloud seeding is Silver Iodide (AgI) to aid in the formation of ice crystals. Cloud seeding is a weather-modification technique that improves a cloud’s ability to produce rain or snow by introducing tiny ice nuclei into certain types of subfreezing clouds.
- Question 39 of 50
39. Question
White phosphorus is always kept under:
Hint
White phosphorus is a highly reactive clement. It is stored underwater for safekeeping to prevent it from catching fire spontaneously in the air.
Red phosphorus is more stable than white phosphorus. - Question 40 of 50
40. Question
Seawater can be purified by the process of:
Hint
Seawater can be purified by the process of distillation. Distillation on a large scale involves boiling water and collecting water vapor during the process.
- Question 41 of 50
41. Question
Galena is a mineral of:
Hint
Galena is a lead sulfide mineral with a chemical composition of PbS. It is the primary ore of lead and is often mined for its silver content.
- Question 42 of 50
42. Question
Magnalium is an alloy of:
Hint
Magnalium is an aluminium alloy with 5% magnesium and 95% aluminum.
- Question 43 of 50
43. Question
Galvanization of Iron is carried out using:
Hint
Galvanizing is a process of coating iron or steel with zinc in order to provide greater protection against corrosion for the iron or steel base.
- Question 44 of 50
44. Question
Cooking gas is a mixture of:
Hint
Cooking gas (LPG) is a mixture of butane and propane. It is composed of hydrocarbons containing three or four carbon atoms. The normal components of LPG thus, are propane (C3H8) and butane (C4H10). Small concentrations of other hydrocarbons may also be present.
- Question 45 of 50
45. Question
Dry powder fire extinguishers contain:
Hint
Dry powder fire extinguishers contain sand and sodium bicarbonate. It sprays a very fine powder of sand and sodium bicarbonate (NaHCO3, baking soda) or potassium bicarbonate (KHCO3) or monoammonium phosphate ((NH4)H2PO4).
- Question 46 of 50
46. Question
Which type of glass is used for making glass reinforced plastic?
Hint
Fibre-lass is used for making glass-reinforced plastic. Fiber-reinforced plastic is a composite material made of a polymer matrix reinforced with fibres. The fibres are usually glass, carbon, aramid, or basalt.
- Question 47 of 50
47. Question
Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are:
Hint
Control rods are used in nuclear reactors to control the rate of fission of the nuclear fuel – uranium or plutonium. Boron and Cadmium are strong neutron absorbers and are the most common materials used in control rods.
- Question 48 of 50
48. Question
The most commonly used chemicals in artificial rainmaking or cloud seeding are:
Hint
The chemical(s) most commonly used for cloud seeding is Silver Iodide (AgI) to aid in the formation of ice crystals. Cloud seeding is a weather-modification technique that improves a cloud’s ability to produce rain or snow by introducing tiny ice nuclei into certain types of subfreezing clouds.
- Question 49 of 50
49. Question
Which of the following can be used to absorb neutrons to control the chain reaction during nuclear fission?
Hint
Control rods are used in nuclear reactors to control the rate of fission of the nuclear fuel – uranium or plutonium. Boron and Cadmium are strong neutron absorbers and are the most common materials used in control rods.
- Question 50 of 50
50. Question
Hydrogen bomb is based on the principle of:
Hint
Hydrogen bomb is based on the principle of uncontrolled fusion reaction. A hydrogen bomb (also called thermonuclear bomb) is an uncontrolled fusion reaction in which enormous amounts of energy are released.