1. Which of the following is the electron configuration of a metallic element?
(a) 2, 8
(b) 2, 8, 7
(c) 2, 8, 8
(d) 2, 8, 8, 2
[45th B.P.S.C. (Pre) 2001]
Ans. (d) 2, 8, 8, 2
- Calcium is a dull, grey metal with a silver appearance and a high melting and boiling point.
- It has a valence electron configuration of 2,8,8,2, which means it can lose two electrons to become a noble gas.
- It is reactive with acids, which produces heat and forms Calcium Chloride and Hydrogen gas.
- These all show that Calcium is a metal.
|
2. Which is the most reactive metal?
(a) Sodium
(b) Calcium
(c) Iron
(d) Potassium
[56th to 59th B.P.S.C. (Pre) 2015]
Ans. (d) Potassium
- Potassium is the most reactive metal out of the options given.
- It is more reactive than Sodium, Calcium, and Iron, in that order.
|
3. Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?
(a) Lithium and Mercury
(b) Lithium and Osmium
(c) Aluminium and Osmium
(d) Aluminium and Mercury
[I.A.S. (Pre) 2008]
Ans. (b) Lithium and Osmium
| Metals |
Atomic No. |
Atomic Weight (amu) |
Density (g/cc) |
| 1. Lithium |
3 |
6.941 |
0.534 |
| 2. Mercury |
80 |
200.59 |
13.534 |
| 3. Osmium |
76 |
190.23 |
22.61 |
| 4. Aluminium |
13 |
26.982 |
2.70 |
- The data shows that Lithium is the lightest metal.
- Osmium is the heaviest and most dense metal found in nature.
|
4. Which one of the following is the hardest metal?
(a) Gold
(b) Iron
(c) Platinum
(d) Tungsten
[U.P.P.C.S. (Pre) 1996]
Ans. (d) Tungsten
- Diamonds are harder than any other natural material, while Tungsten is the hardest metal.
|
5. Which is the hardest of the following?
(a) Diamond
(b) Glass
(c) Quartz
(d) Platinum
[44th B.P.S.C. (Pre) 2000, M.P.P.C.S. (Pre) 1992]
Ans. (a) Diamond
- Diamond is the strongest of all natural materials, it is not easily crushed and it is the best at transferring heat.
|
6. Which of the following is a naturally occurring hardest substance on the earth?
(a) Graphite
(b) Wurtzite boron nitride
(c) Iron
(d) Diamond
[U.P. R.O./A.R.O. (Pre) (Re. Exam) 2016]
Ans. (d) Wurtzite boron nitride
- Diamond is the hardest material found in nature.
- Wurtzite boron nitride is thought to be even stronger than diamond.
- It is made of different atoms, and only form during very hot and high-pressure volcanic eruptions.
- Computer simulations suggest that it is 18% tougher than diamond, because of its more complex structure and flexible bonds.
- However, not much of this mineral has been discovered so its strength has not been tested yet.
- That is why the UPPSC experts chose option (d) for this question in their official answer key.
|
7. Which one of the following materials is very hard and very ductile?
(a) Carborundum
(b) Tungsten
(c) Cast iron
(d) Nichrome
[I.A.S. (Pre) 2000]
Ans. (d) Nichrome
- Nichrome is a type of alloy made up of Nickel, Chromium, Iron, and other elements or substances.
- It is strong and flexible, and has a high resistance to electricity and a low reaction to temperature change. Nichrome is commonly used in resistance wire and in certain dental procedures.
- It is also used in other areas.
|
8. The heaviest natural element is?
(a) Uranium
(b) Mercury
(c) Gold
(d) Calcium
[U.P. Lower Sub. (Pre) 2004]
Ans. (a) Uranium
- Uranium is the heaviest element that exists naturally, with a number of 92.
- It is a silver-colored metal that is solid and heavy.
- The most common version of uranium has 92 protons and 146 neutrons in its nucleus.
- It has a density of 19.05 g/cm3.
|
9. The heaviest metal of the following is made of –
(a) Copper
(b) Uranium
(c) Aluminium
(d) Silver
[40th B.P.S.C. (Pre) 1995]
Ans. (b) Uranium
- Uranium is the heaviest element found in nature.
- It has an atomic number of 92 and is a silver-colored metal.
- Its most common form has a nucleus with 92 protons and 146 neutrons.
- It is very heavy, with a density of 19.05 g/cm3.
|
10. The heaviest metal among the following is :
(a) Gold
(b) Silver
(c) Mercury
(d) Platinum
(e) None of the above/More than one of the above
[63rd B.P.S.C. (Pre) 2017]
Ans. (d) Platinum
- Of the choices presented, platinum is the most dense metal, with a weight of 21.09 grams per cubic centimetre.
|
11. The costliest metal in the world discovered recently is :
(a) Endohedral Fullerene
(b) Californium 252
(c) Tritium
(d) Rhodium
[U.P. P.C.S. (Pre) 2016]
Ans. (*)
- The material, their discovery and cost per gram in US are given below
| Material |
Discovery (in year) |
Cost per gram (in US ) |
| Tritium |
1934 |
30,000 |
| Rhodium |
1803 |
58 |
| Californium-252 |
1950 |
27 million |
| Endohedral Fullerene |
1985 |
167 million |
- It’s clear that Endohedral Fullerene is the most expensive material recently found.
- However, this is not the correct answer to the question asking about the costliest metal.
- Endohedral Fullerene has two types, metallofullerenes and nonmetal-doped fullerenes.
- Californium-252 is the most expensive metal but it wasn’t recently discovered.
- So the original question is not accurate.
|
12. The chemical structure of the pearl is –
(a) Calcium Carbonate
(b) Calcium Carbonate & Magnesium Carbonate
(c) Calcium Chloride
(d) Calcium Sulphate
[Uttarakhand P.C.S. (Pre) 2007]
Ans. (a) Calcium Carbonate
- Pearls are mostly made up of calcium carbonate and a protein called conchiolin, with a small amount of water.
|
13. The main constituents of pearl are –
(a) Calcium Carbonate and Magnesium Carbonate
(b) Aragonite and Conchiolin
(c) Ammonium sulphate and Sodium Carbonate
(d) Calcium oxide and Ammonium Chloride
[I.A.S. (Pre) 1994]
Ans. (b) Aragonite and Conchiolin
- Pearls are made up of 85% calcium carbonate (aragonite), 10-14% conchiolin (a protein), and 2-4% water (which is a mix of calcium carbon
|
14. Pearl is mainly constituted of –
(a) Calcium Oxalate
(b) Calcium Sulphate
(c) Calcium Carbonate
(d) Calcium Oxide
[R.A.S./R.T.S.(Pre) 2008]
Ans. (c) Calcium Carbonate
- Pearls are mostly made of calcium carbonate and conchiolin, which is a protein, with a small amount of water.
- 85% of a pearl is calcium carbonate, 10-14% is
|
15. What are Rubies and Sapphires chemically known as?
(a) Silicon Dioxide
(b) Aluminium Oxide
(c) Lead Tetroxide
(d) Boron Nitride
[I.A.S. (Pre) 2008]
Ans. (b) Aluminium Oxide
- Aluminum Oxide is a mixture of Aluminum and Oxygen (Al2O3).
- Corundum is the typical form of Aluminum Oxide in nature.
- Rubies and Sapphires are special kinds of Corundum, and their special colors come from tiny bits of other substances.
|
16. The chemical formula of sapphire (Ruby) is :
(a) Al2O3
(b) Al3O2
(c) N2O
(d) NO2
(e) None of the above/More than one of the above
[66th B.P.S.C. (Pre) (Re. Exam) 2020]
Ans. (a) Al2O3
- Sapphire (Ruby) is a precious gemstone made up of Aluminium Oxide (Al2O3).
- It is a type of mineral called corundum.
|
17. Assertion (A): Sodium metal is stored under kerosene. Reason (R): Metallic sodium melts when exposed to air.
(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true, but (R) is not a correct explanation of (A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true.
[I.A.S. (Pre) 1998]
Ans. (c) (A) is true, but (R) is false
- Sodium is stored in kerosene to stop it from mixing with oxygen in the air.
- If it does, it will make sodium oxide and release a lot of heat.
- So, it is important to keep it in kerosene.
|
18. Which one of the following elements is kept safely in Kerosene oil?
(a) Sodium
(b) Copper
(c) Mercury
(d) Silver
[U.P.P.C.S. (Mains) 2017]
Ans. (a) Sodium
- Sodium is kept in kerosene so that it does not mix with oxygen in the air.
- This would cause a reaction which would create a lot of heat.
- This is why Sodium is kept covered in kerosene.
|
19. These days yellow lamps are frequently used as street lights. Which one of the following is used in these lamps :
(a) Sodium
(b) Neon
(c) Hydrogen
(d) Nitrogen
[U.P.P.C.S. (Pre) 2000]
Ans. (a) Sodium
- Municipalities use two types of street light lamps: mercury vapor and sodium vapor.
- Mercury vapor lamps tend to give off a white light, while sodium vapor lamps give off an orange/yellow light.
- Low-pressure sodium lamps have shorter life spans, lower lumen per watt efficiency and lower colour rendering index than high-pressure sodium lamps.
|
20. Sodium Vapor Lamp is usually used as street light, because –
(a) These are cheap.
(b) Light from this is monochromatic and will not split through water droplets.
(c) It is pleasing to the eyes.
(d) It is brightly illuminating.
[U.P.P.C.S. (Pre) 2007]
Ans. (b) Light from this is monochromatic and will not split through water droplets
- A sodium-vapor lamp is a type of lightbulb that uses sodium in a special form to create light.
- It only produces a single yellow color, making it difficult to see colors at night, and it doesn’t penetrate through rain.
- It also creates less light pollution than other types of lightbulbs.
|
21. Which one of the following metals is accessed in the native state?
(a) Aluminium
(b) Gold
(c) Chromium
(d) Zinc
[U.P.P.C.S. (Mains) 2016]
Ans. (b) Gold
- Out of the metals listed, gold is the least reactive, so it can be found in its natural form.
- These four metals – gold, silver, copper, and platinum are found in large amounts in nature.
|
22. Gold is dissolved in –
(a) Sulphuric acid
(b) Aqua regia
(c) Mixture of Sulphuric and Nitric Acid
(d) Hydrochloric acid
[47th B.P.S.C. (Pre) 2005]
Ans. (b) Aqua regia
- Gold is not affected by air, water, alkali halogen, or any other acid, except Aqua regia.
- This special mixture of hydrochloric and nitric acid is so powerful that it can dissolve gold, which is known as the “king of metals”.
- It is a yellow or red liquid that has a strong odor.
|
23. Of how many carats is the pure gold?
(a) 22
(b) 24
(c) 28
(d) 20
[M.P.P.C.S. (Pre) 1995]
Ans. (b) 24
- The carat system is used to measure the purity of gold. 24 carat gold is pure, but it is usually mixed with other metals to make it harder and to change its color and other properties.
- The usual mix is 22k, 18k, 14k or 10k, which have more copper, silver, palladium or other base metals in them.
|
24. Minerals are-
(a) Liquids
(b) Inorganic solids
(c) Gases
(d) All of the above
[53rd to 55th B.P.S.C. (Pre) 2011]
Ans. (b) Inorganic solids
- Geologists say that minerals are substances that are not made by people, have a certain chemical makeup, and have known physical traits.
|
25. The softest mineral, Talc (Soapstone) is mainly :
(a) Manganese Silicate
(b) Sodium Silicate
(c) Sodium Phosphate
(d) Magnesium Silicate
[R.A.S./R.T.S.(Pre) 1999]
Ans. (d) Magnesium Silicate
- Talc is a mineral made up of Magnesium silicate.
- It is the softest mineral and is rated 1 on the Mohs hardness scale, while a diamond, which is the hardest mineral, is rated at 10.
- Talc is commonly used in powder form as baby powder.
- It is usually found in clumps or strands, and rarely appears in crystal form.
|
26. The chemical name of limestone is?
(a) Calcium Carbonate
(b) Magnesium Chloride
(c) Sodium Chloride
(d) Sodium Sulphide
[U.P.P.C.S. (Pre) 1993]
Ans. (a) Calcium Carbonate
- Limestone is a type of sedimentary rock made mostly of Calcite and Aragonite, which are different types of Calcium Carbonate.
- It has the ability to combine with silica and other substances to take them away from the iron.
|
27. ‘Plaster of Paris’ is made up of
(a) Marble
(b) Cement
(c) Gypsum
(d) Limestone
[Chhattisgarh P.C.S. (Pre) 2019]
Ans. (c) Gypsum
- Plaster of Paris is a white powder that is made by heating up gypsum.
- It is usually used to make molds and casts and can be mixed with water to form a paste that dries quickly.
|
28. To protect broken bones, Plaster of Paris is used. It is :
(a) Slaked lime
(b) Calcium carbonate
(c) Calcium oxide
(d) Gypsum
(e) None of the above/More than one of the above
[63rd B.P.S.C. (Pre) 2017]
Ans. (d) Gypsum
- Plaster of Paris is a white powder that is a slightly-hydrated form of calcium sulfate.
- It is made by heating gypsum and is often used to make casts and molds by mixing it with water to form a paste that sets quickly.
|
29. Chemically ‘Plaster of Paris’ is :
(a) Calcium Sulphate
(b) Calcium Carbonate
(c) Calcium Oxide
(d) Calcium Oxalate
[R.A.S./R.T.S.(Pre) 2007]
Ans. (a) Calcium Sulphate
- Plaster of Paris is a white, powdery material made from heated gypsum.
- It is mainly used to make casts and molds when mixed with water. It sets quickly.
|
30. The chemical formula of the Plaster of Paris is –
(a) CaSO4
(b) CaSO4ò H2O
(c) CaSO4.H2O
(d) CaSO4.2H2O
[42nd B.P.S.C. (Pre) 1997, 39th B.P.S.C. (Pre) 1994]
Ans. (b) CaSO4ò H2O
- Plaster of Paris is a white, powdery material made from heating up gypsum.
- It is mostly used for making casts and molds because it quickly sets when mixed with water.
|
31. Doctors, Artists, and Sculptors use Calcium Sulphate which is popularly known as –
(a) Quick lime
(b) Limestone
(c) Bleaching powder
(d) Plaster of Paris
[U.P. Lower Sub. (Spl.) (Pre) 2004]
Ans. (d) Plaster of Paris
- Plaster of Paris is a white powdery material made from heating up gypsum.
- It is mostly used to make casts and molds by mixing it with water to make a paste that sets quickly.
|
32. Which one of the following materials contains calcium?
(a) China clay
(b) Corundum
(c) Gypsum
(d) Talc
[U.P.P.C.S. (Pre) 2019]
Ans. (c) Gypsum
- Gypsum is a soft mineral made out of calcium sulfate dihydrate (CaSO4.2H2O).
- It is often mined and used in fertilizers, plaster, chalk, and drywall.
|
33. Monazite is an ore of –
(a) Zirconium
(b) Thorium
(c) Titanium
(d) Iron
[I.A.S. (Pre) 1994]
Ans. (b) Thorium
- Monazite is an important source of Thorium, Lanthanum and Cerium.
- India, Madagascar and South Africa all have a lot of monazite.
- India has the biggest amount of this ore, especially in the south of the country.
|
34. Mica is a :
(a) Good conductor of heat and bad conductor of electricity
(b) Bad conductor of both heat and electricity
(c) Good conductor of heat and electricity both
(d) Bad conductor of heat and good conductor of electricity
[Chhattisgarh P.C.S. (Pre) 2003]
Ans. (a) Good conductor of heat and bad conductor of electricity
- Good materials for carrying electricity are aluminum, brass, copper, iron, and steel.
- Poor materials for carrying electricity are acrylic, china clay, glass, mica, paper, plastic, and wood.
- Mica is not a good conductor of electricity, but it is a good conductor of heat.
- It is often used in the electrical industry.
|
35. In which of the following industries is mica used as a raw material –
(a) Iron and steel
(b) Toys
(c) Glass and pottery
(d) Electrical
[U.P.P.C.S (Pre) 2010]
Ans. (d) Electrical
- Materials that allow electricity to pass through them easily are known as good conductors, such as aluminum, brass, copper, iron, and steel.
- On the other hand, materials that do not allow electricity to pass through them are called bad conductors, including acrylic, china clay, glass, mica, paper, plastic, and wood.
- Mica is an example of a raw material.
|
36. Which among the following liquids is the best conductor of heat?
(a) Mercury
(b) Water
(c) Ether
(d) Benzene
[U.P.P.C.S. (Pre) 2005, U.P.P.C.S. (Mains) 2014]
Ans. (a) Mercury
- Mercury is a metal with the symbol (Hg) and is often used in thermometers due to its ability to measure a wide range of temperatures from -40°C to 356°C and up to 570°C under pressure.
- It is a liquid at normal temperatures and is the poorest conductor of heat out of all the metals, but among the available options it is the best conductor of heat.
|
37. The poorest conductor of heat among the following is :
(a) copper
(b) lead
(c) mercury
(d) zinc
(e) None of the above / More than one of the above
[66th B.P.S.C. (Pre) 2020]
Ans. (c) mercury
- Metals are all good at conducting heat, but lead and mercury are worse than other metals.
- Lead has a thermal conductivity of 34.7 w/mK and mercury has a thermal conductivity of 8.31 w/mK.
- This means that mercury is the worst conductor of heat out of all metals.
|
38. Which one of the following metals is liquid at ordinary temperature?
(a) Lead
(b) Nickel
(c) Mercury
(d) Tin
[U.P.P.C.S. (Mains) 2014, 44th B.P.S.C. (Pre) 2000]
Ans. (c) Mercury
- Mercury is the only type of metal that is liquid, not solid, at a normal temperature.
- It’s also known as quicksilver.
|
39. Which of the following is in liquid form at room temperature?
(a) Lithium
(b) Sodium
(c) Francium
(d) Cerium
[Jharkhand P.C.S. (Pre) 2013]
Ans. (c) Francium
- Two elements, Bromine and Mercury, are liquid at normal room temperature (25°C).
- Four more elements melt at a slightly higher temperature than room temperature, these are –
- Francium
- Caesium
- Gallium
- Rubidium
|
40. Mercury is basically used in thermometer devices because its especially is –
(a) High density
(b) High liquidity
(c) High circulation power
(d) High specific heat
[U.P. Lower Sub. (Pre) 2003]
Ans. (c) High circulation power
- Mercury is the ideal liquid to put in thermometers, here are five reasons why:
- It is highly reflective, making it easy to see and read clearly.
- The instrument won’t get wet, so you can get an accurate reading even if the temperature is dropping.
- It is a metal, so it allows heat to pass through it.
- It grows in size with the temperature and has strong flow, so it can be measured accurately with a linear scale.
- It is a liquid over a wide range of temperatures.
|
41. Which of the following do not react with water at all?
(a) Iron
(b) Lead
(c) Magnesium
(d) Aluminium
(e) None of the above
[Chhattisgarh P.C.S. (Pre) 2015]
Ans. (b) Lead
- Potassium and sodium react very strongly when put into cold water.
- Calcium reacts less strongly.
- Magnesium won’t react with cold water, but will react when put in hot water.
- Aluminium, iron, and zinc do not react with cold or hot water, but they do react with steam.
- Lead, copper, silver, gold and platinum don’t react with any kind of water.
|
42. There is no reaction when steam passes over –
(a) Aluminium
(b) Copper
(c) Carbon
(d) Iron
[38th B.P.S.C. (Pre) 1992]
Ans. (b) Copper
- Potassium and sodium are metals which react strongly when mixed with cold water.
- Calcium is less reactive with water.
- Magnesium only reacts with hot water, while aluminium, iron and zinc do not react with cold or hot water, but they do react with steam.
- Lead, copper, silver, gold and platinum are metals which do not react with water in any form.
|
43. Iron is obtained from :
(a) Limestone
(b) Pitch-blende
(c) Monazite Sand
(d) Haematite
[R.A.S./R.T.S.(Pre) 1999]
Ans. (d) Haematite
- Iron ores are types of rocks and minerals that contain a large amount of iron.
- Typically, the iron can be taken out and used economically.
- The oxides of iron are found in these ores, mainly in the form of magnetite (with 72.4% Fe) and haematite (with 69.9 % Fe).
|
44. Match List-I with List-II and select the correct answer from the code given below the lists:
List-I List-II
(Metal) (Property)
A. Sodium 1. Good conductor of electricity
B. Mercury 2. Liquid at room temperature
C. Silver 3. Poor conductor of heat
D. Lead 4. Can be easily cut with knife
Code :
A B C D
(a) 2 3 1 4
(b) 1 4 3 2
(c) 4 2 1 3
(d) 4 1 2 3
[U.P. P.C.S. (Pre) 2020]
Ans. (c) 4 2 1 3
- The correctly matched lists are as follows :
| List-I |
List-II |
| (Metal) |
(Property) |
| Sodium |
Can be easily cut with knife |
| Mercury |
Liquid at room temperature |
| Silver |
Good conductor of electricity |
| Lead |
Poor conductor of heat |
|
45. Match List-I with List-II and select the correct answer using the codes given below the lists :
List-I List-II
A. Best conductor of heat and electricity 1. Gold
B. Metal found in highest amount 2. Lead
C. Most flexible metal and table to increase by bang 3. Aluminium
D. Minimum heat conducting 4. Silver
Codes :
A B C D
(a) 1 3 2 4
(b) 2 3 4 1
(c) 3 2 4 1
(d) 4 3 1 2
[U.P. Lower Sub. (Pre) 2002]
Ans. (d) 4 3 1 2
| Best conductor of heat and electricity |
Silver |
| Metal found in highest amount |
Aluminium |
| Most flexible metal and able to increase by bang metal |
Gold |
| Minimum heat conducting |
Lead |
46. Which of the following materials has the highest electrical conductivity ?
(a) Diamond
(b) Silver
(c) Graphite
(d) Wood
[Uttarakhand U.D.A./L.D.A. (Mains) 2006]
Ans. (b) Silver
- Silver is the best metal for conducting electricity.
- Other metals are compared to silver to measure their electrical conductivity.
|
47. Which of the following is mainly used for the production of Aluminium?
(a) Hematite
(b) Lignite
(c) Bauxite
(d) Magnetite
[M.P.P.C.S. (Pre) 2005]
Ans. (c) Bauxite
- Bauxite is a type of mineral which contains aluminum.
- It is made up of a mix of substances such as gibbsite, boehmite, diaspore, goethite and haematite.
- It was first found in the village of Les Baux in the south of France by a French geologist.
|
48. Bauxite, is an ore of which of the following metals?
(a) Iron
(b) Copper
(c) Aluminium
(d) Silver
[Uttarakhand P.C.S. (Pre) 2007, U.P. U.D.A./L.D.A. (Pre) 2006]
Ans. (c) Aluminium
- Bauxite is a mineral that contains Aluminium, and has the chemical formula Al2O3.2H2O.
- It is the main source of Aluminium.
- An ore is a type of rock that contains metal that can be taken out.
|
49. Bauxite is the ore of –
(a) Iron
(b) Aluminium
(c) Copper
(d) Gold
[U.P.P.C.S. (Pre) (Re. Exam) 2015]
Ans. (b) Aluminium
- Bauxite is a mineral made of Aluminum with the chemical formula Al2O3.
- 2H2O. It is the main source of Aluminum.
- Minerals and rocks naturally contain metals that can be taken out.
|
50. Aluminium metal is obtained from –
(a) Pitch blende
(b) Graphite
(c) Bauxite
(d) Argentite
[Uttarakhand U.D.A./L.D.A. (Mains) 2007]
Ans. (c) Bauxite
- Aluminium is the most common metal on the planet, but it is not found in its pure form.
- It has to be taken out of its ore, which is called bauxite.
- The process of getting aluminum is very demanding, which makes it one of the costliest metals to make.
|
51. Which one of the following statements is correct?
(a) Liquid sodium is employed as a coolant in nuclear reactors
(b) Calcium carbonate is an ingredient of toothpaste
(c) Bordeaux mixture consists of sodium sulfate and lime
(d) Zinc amalgams are used as a dental filling
[I.A.S. (Pre) 2003]
Ans. (b) Calcium carbonate is an ingredient of toothpaste
- Calcium carbonate in its precipitated and ground forms is often used for toothpaste and other oral hygiene products.
- Since it can’t dissolve in water, it is mainly used in products that are not clear or transparent.
|
52. Match List-I (Industrial process) with List-II (Industry with which associated) and select the correct answer using the codes given below the lists.
List-I List-II
A. Cracking 1. Rubber
B. Smelting 2. Petroleum
C. Hydrogenation 3. Copper
D. Vulcanization 4. Edible Fats
Code :
A B C D
(a) 3 2 1 4
(b) 2 3 4 1
(c) 2 3 1 4
(d) 3 2 4 1
[I.A.S. (Pre) 2000]
Ans. (b) 2 3 4 1
| Cracking |
Petroleum |
| Smelting |
Copper |
| Hydrogenation |
Edible Fats |
| Vulcanization |
Rubber |
53. Match List-I with List-II and select the correct answer using the codes given below the lists :
List – I List-II
(Naturally occurring substance) (Elements present)
A. Diamond 1. Calcium
B. Marble 2. Silicon
C. Sand 3. Aluminium
D. Ruby 4. Carbon
Code :
A B C D
(a) 3 1 2 4
(b) 4 2 1 3
(c) 2 1 3 4
(d) 4 1 2 3
[I.A.S. (Pre) 1999, U.P.P.C.S. (Pre) 2010, U.P.U.D.A./L.D.A. (Pre) 2010]
Ans. (d) 4 1 2 3
| List – I |
List-II |
| (Naturally occurring substance) |
(Elements present) |
| A. Diamond |
1. Calcium |
| B. Marble |
2. Silicon |
| C. Sand |
3. Aluminium |
| D. Ruby |
4. Carbon |
|
54. Which of the following materials has the highest electrical conductivity ?
(a) Diamond
(b) Silver
(c) Graphite
(d) Wood
[Uttrakhand U.D.A./L.D.A. (Mains) 2006]
Ans. (b) Silver
- Silver is the best metal for conducting electricity.
- It is the highest on the scale, with a rating of 100, while copper has 97 and gold has 76.
- All other metals are compared to silver when measuring conductivity.
|
55. Which of the following is mainly used for the production of Aluminium?
(a) Hematite
(b) Lignite
(c) Bauxite
(d) Magnetite
[M.P.P.C.S. (Pre) 2005]
Ans. (c) Bauxite
- Bauxite is a type of ore that contains aluminum.
- It is made up of hydrated aluminum oxides, gibbsite Al(OH)3, boehmite γ-AlO(OH), and diaspore α-AlO(OH) along with two iron oxides, goethite and haematite.
- Bauxite was first found in the village of Les Baux in southern France
|
56. Bauxite, is an ore of which of the following metals?
(a) Iron
(b) Copper
(c) Aluminium
(d) Silver
[Uttarakhand P.C.S. (Pre) 2007, U.P. U.D.A./L.D.A. (Pre) 2006]
Ans. (c) Aluminium
- Bauxite is a type of ore which contains aluminum.
- It is made up of minerals like gibbsite, boehmite, diaspore and iron oxides goethite and haematite.
- It was first found by a French geologist near the village of Les Baux in southern France.
|
57. Bauxite is the ore of –
(a) Iron
(b) Aluminium
(c) Copper
(d) Gold
[U.P.P.C.S. (Pre) (Re. Exam) 2015]
Ans. (b) Aluminium
- Bauxite is a type of ore that contains aluminum.
- It is made up of several minerals, including gibbsite, boehmite, diaspore, goethite, and haematite.
- It was first found in the village of Les Baux in southern France by a French geologist.
|
58. Aluminium metal is obtained from –
(a) Pitch blende
(b) Graphite
(c) Bauxite
(d) Argentite
[Uttarakhand U.D.A./L.D.A. (Mains) 2007]
Ans. (c) Bauxite
- Bauxite is a type of ore that contains aluminum.
- It is made of minerals like gibbsite, boehmite, and diaspore, plus iron oxides like goethite and haematite.
- It was first found near the village of Les Baux in southern France by a French geologist.
|
59. Which one of the following statements is correct?
(a) Liquid sodium is employed as a coolant in nuclear reactors
(b) Calcium carbonate is an ingredient in toothpaste
(c) Bordeaux mixture consists of sodium sulfate and lime
(d) Zinc amalgams are used as a dental filling
[I.A.S. (Pre) 2003]
Ans. (b) Calcium carbonate is an ingredient in toothpaste
- PCCs and GCCs are commonly used to make toothpaste and other products for oral hygiene.
- Calcium carbonate doesn’t dissolve in water, so it can only be used to make products that are not see-through.
|
60. Match List-I (Industrial process) with List-II (Industry with which associated) and select the correct answer using the codes given below the lists.
List-I List-II
A. Cracking 1. Rubber
B. Smelting 2. Petroleum
C. Hydrogenation 3. Copper
D. Vulcanization 4. Edible Fats
Code :
A B C D
(a) 3 2 1 4
(b) 2 3 4 1
(c) 2 3 1 4
(d) 3 2 4 1
[I.A.S. (Pre) 2000]
Ans. (b) 2 3 4 1
| Cracking |
Petroleum |
| Smelting |
Copper |
| Hydrogenation |
Edible Fats |
| Vulcanization |
Rubber |
61. Match List-I with List-II and select the correct answer using the codes given below the lists :
List – I List-II
(Naturally occurring substance) (Elements present)
A. Diamond 1. Calcium
B. Marble 2. Silicon
C. Sand 3. Aluminium
D. Ruby 4. Carbon
Code :
A B C D
(a) 3 1 2 4
(b) 4 2 1 3
(c) 2 1 3 4
(d) 4 1 2 3
[I.A.S. (Pre) 1999, U.P.P.C.S. (Pre) 2010, U.P.U.D.A./L.D.A. (Pre) 2010]
Ans. (d) 4 1 2 3
| (Naturally occurring substance) |
(Elements present) |
| A. Diamond |
4. Carbon |
| B. Marble |
1. Calcium |
| C. Sand |
2. Silicon |
| D. Ruby |
3. Aluminium |
|
62. Which of the following is lighter than water?
(a) Aluminium
(b) Sodium
(c) Magnesium
(d) Manganese
[Uttarakhand U.D.A. /L.D.A. (Pre) 2003]
Ans. (b) Sodium
- Water is one gram per cubic centimeter, but metals like Lithium, Potassium, and Sodium are all lighter than water.
- These metals are bendable and very reactive, so it’s not possible to use them to make strong alloys.
|
63. Which one of the following is the correct sequence of the given substances in the decreasing order of their densities?
(a) Steel > Mercury > Gold
(b) Gold > Mercury > Steel
(c) Steel > Gold > Mercury
(d) Gold > Steel > Mercury
[I.A.S. (Pre) 2005]
Ans. (b) Gold > Mercury > Steel
- The table above shows us that Gold is the most dense substance, followed by Mercury and then Steel.
- This means that Gold is the most dense, then Mercury, and Steel is the least dense.
|
64. Which of the following has the highest melting point?
(a) Boron
(b) Iron
(c) Silicon
(d) Aluminium
(e) None of the above/More than one of the above
[66th B.P.S.C. (Pre) (Re. Exam) 2020]
Ans. (a) Boron
- Boron melts at the highest temperature of 2453 degrees Kelvin, Iron melts at 1808 degrees, Silicon melts at 1693 degrees, and Aluminium melts at 933 degrees.
- Therefore, Boron has the highest melting point of the four
|
