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50-Precious Science Questions Especially Appearing for PSC Exams

The following are basic questions in Science section especially appearing for PSC Examinations,so should not neglect any of the given below details because that should destine you to enter in the any of the rank list published by Kerala Public Service Commission .This questions frequently appearing for the PSC online Examinations too.


  1. Hypoxia is a pathological condition due to
    Ans:Lack of oxygen in blood
  2. High pressure of the aqueous humour of eyes causes
  3. What is laughing gas
    Ans:Nitrous oxide
  4. Which variety of coal contains the largest amount of carbon
  5. The names of the scientist Newlands ,Mendeleev and Meyer are associated with the development of
    Ans:Periodic table of elements
  6. The major constituent of air is
  7. The first metal used by man was
  8. Potassium nitrate is used in
  9. Monozite is an ore of
  10. The two elements that are frequently used for making transistors are
    Ans:Silicon and Germanium
  11. Rainbow is due to
    Ans:Refraction and reflection of sunlight by water droplets
  12. The gas used in the manufacture of vanaspati from vegitable oil is
  13. Solar eclipse will take place from
    Ans:The moon is between the sun and earth
  14. Koala is found in
  15. Myopia is a disorder of eye in which image of eyes are focused
    Ans:In front of retina
  16. Conjunctivitis is a common disease affecting
  17. The most malleable metal is
  18. Cocos nucifera is the botanical name of
    Ans:Coconut tree
  19. From which part of the plant Quinine is obtained
    Ans:Stem bark of cinchona plant
  20. Cotton cultivation is suited in
    Ans:Black soil
  21. Humus is formed due to the action of
    Ans:Microbes on detritus
  22. The longest reptile
    Ans:Reticulated Python
  23. The light waves are
    Ans:Electromagnetic waves
  24. The enzyme that converts glucose into ethyl alcohol is
  25. Reo virus are
    Ans:Double stranded RNA viruses
  26. Retinoblastoma is a cancer associated with gene in —- Chromosomes of human
    Ans:13th chromosome
  27. Espundia is a disease caused by
  28. Electrolyte in a Volta cell
    Ans:Diluted Sulphuric acid
  29. The gas absorbed by plants during photosynthesis
    Ans:Carbon dioxide
  30. The most stable forms of carbon
  31. The first organic compound prepared in laboratory
  32. Light travel fastest in
  33. Superconductors are substances which
    Ans:Offer no resistance to the flow of electricity
  34. Oil raise up the wick in a lamp. The principle involves
    Ans:Capillary action
  35. The nucleus of Hydrogen atom consists of
    Ans:1 proton only
  36. The most commonly used bleaching agent is
  37. Light from the star,Alpha Centauri Which is nearest to the earth after the sun reaches the earth in
    Ans:4.2 years
  38. The main chemical constituent of clay is
    Ans:Aluminium silicate
  39. The main active constituent of tea and coffee is
  40. Sir C.V.Raman was awarded Nobel Prize for his work connected with which phenomenon
    Ans:Scattering of light
  41. In which industries mica is used as raw material
  42. Which one of the following is a progressive degenerative disorser causes trembling of hands arms legs etc.
    Ans:Parkinsons disease
  43. Radiocarbon dating technique is used to estimate the age of
  44. Natural radioactivity was discovered by
    Ans:Henry Baquerel
  45. Optical works on the
    Ans:Total internal reflection
  46. Sound travels with different speed in media ,In what order does the velocity of sound increase in iron air water
    Ans:Air,water and iron
  47. The maximum desirable limit as per BIS norms of lead in the drinking water
  48. Anthology is the study of
  49. Kidney stone is chemically
    Ans:Calcium oxalate
  50. The intensity of whisper is
    Ans:20 decibel

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50 -Precious Science Questions Especially Appearing for PSC Exams

The following are basic questions in Science section especially appearing for PSC Examinations,so should not neglect any of the given below details because that should destine you to enter in the any of the rank list published by Kerala Public Service Commission

  1. Germ free isolation suits are essential to those who have
    Ans:Person with SCID (Severe combined Immuno Deficiency)
  2. Protozoan parasite that usually infects AIDS patient is
    Ans:Pneumocystis carinii
  3. Cushings syndrome is a due to the over production of
  4. Otosclerosis is the hardening of —-in the middle ear
  5. Behcets disease are chronic diseases associated with
    Ans:Defective Autoimmune responses
  6. Which disease is an inheritable nervous disorder
    Ans:Huntingtons disease
  7. A particle having negligible mass and negative charges is
  8. 1 amu is equal to
    Ans: of C-12
  9. The metal which do not liberate Hydrogen gas from acid is
  10. What is the unit for measuring the amplitude of a sound
  11. Detergents used for cleaning clothes and utensils contain
  12. Soap is mixture of sodium or potassium salts of
    Ans:Monocarboxylic acids
  13. The principal metal used in manufacturing steel is
  14. The first person to see a cell under microscope was
    Ans:Robert Hooke
  15. Thermostat is an instrument used for regulating
  16. The scientist who developed quantum theory
    Ans:Max plank
  17. The gas used for artificial ripening of fruit is
  18. The upper limit of normal cholesterol level in human blood is
  19. 45+XO chromosomal condition is termed as
    Ans:Turner syndrome
  20. The gas released during the production of food in plants
  21. Insufficient blood supply in human body is referred to as
  22. Pine,fir,spruce,cedar,larch,and cypress are belongs to
    Ans:Gymnosperms or non flowering trees
  23. Monocarpic plant which shows flowering once in 12 years
  24. Sound cannot pass through this ,but light pass early
  25. Which item is taken by sports men to get instant energy
    Ans:Carbohydrates especially glucose
  26. Name the layer of earths atmosphere that absorb uv rays
  27. Which element is used in fire works for getting red colour
  28. Which food crop was most benefitted by Green Revolution
  29. The element formed in Sun as the result of nuclear fusion
  30. The maximum audible frequency to human ears is—Hz
  31. Who is regarded as the father of Indian Nuclear Science
  32. Which cell organelle is known as power house of the cell
  33. What is the wavelength of visible spectrum
  34. Einstein published General theory of Relativity in
  35. One horse power is
    Ans:746 watts
  36. One mach number refer to
  37. Prions are disease causing agents belongs to the category of
  38. Sleeping sickness is transmitted by
    Ans:Glossina palpalis(tse tse fly)
  39. Halitosis is described as
    Ans:Bad breath
  40. Ferrous Sulphate is known as
    Ans:Green vitriol
  41. Bhopal gas tragedy was due to
    Ans:Methyl isocynate
  42. Typhoid is a disease associated with
  43. German silver is an alloy of
  44. The tendency of an atom to attract to itself the electron pair shared with another atom is called
    Ans:Electro negativity
  45. The deficiency of Na+,K+,Ca2+ in the body fluids are called
    Ans:Addisons Disease
  46. Consumption of Beef affected with mad cow disease causes —in human
    Ans:Creutzfedlt-Jacob disease
  47. Diamond is an allotropic form of
  48. The element common to all acid
  49. Chemically heavy water is
    Ans:Deuterium oxide
  50. From which mineral radium obtained

0 1605

Some Important Human Diseases

Any of the following details should appear for any PSC Examinations and that may play the key role for determining the rank of any PSC Examinations.So that much important should be given to them

I Caused by Bacteria
Sl.No. Disease Causative Organism Mode of transmission
1 Diphtheria Corynebacterium  diphtheriae Direct contact ,air ,food
2 Pneumonia Diplococcus pneumoniae Through air
3 Tuberculosis Mycobacterium tuberculosis Through air ,Direct contact
4 Bubonic Plague Yersinla pestic Rat fleas
5 Tetanus Clostredium tetani Through wound
6 Typhoid Salmonella typhi Flies,food,ficeces,water
7 Cholera Vibrio cholerae Flies,food,ficeces,water
8 Bacterial dysentery Shigella dysenteriae ,food,ficeces,water
9 Whooping cough Hemophilus pertussis Food,coughing,sneezing
10 Gonorrhoea Neisseria gonorrhoea Sexual intercourse
11 Syphilis Treponema Sexual intercourse
12 Leprosy Mycobacterium leprae Longterm close contact
13 Botulism Clostridium botulinum Infected food
II Caused by Virus
14 Small pox Variola virus Direct contact
15 Chicken pox Varicella virus Direct contact
16 Common cold Rhino virus  contact
17 Influenza Orthomixo virus  Contact,through air
18 Measles Paramyxo virus Direct contact,air
19 Mumps Mumps virus Direct contact,saliva
20 Encephalitis Encephalitis virus Mosquito bite
21 Polio Poliomyelitis virus Contact,flies,food,water
22 Rabies Rhabdo virus Infected dog bite
23 Dengue Fever Dengue virus Acdes mosquito bite
24 Herpes simplex Herpes virus simplex Contact ,faeces,saliva
25 Herpes zoster Herpes virus zoster Contact,air
26 AIDS Human immune virus Via blood and sperm
III Caused by Fungi
27 Ring worm Microsporum,Trichophyton Direct contact,pets
28 Athlet’s  foot Trichophyton Bad foot hygiene
29 Dhobie’s itch Several Fungi Direct contact


0 379

metal elements essential to the human body and its quantity


The following details are very much important on the PSC examination point of view.The following details sometimes act as the rank determining point for any PSC Examinations.So study them with utmost care

  1. Calcium-1000g
  2. Potassium-140g
  3. Sodium-100g
  4. Magnesium-25g
  5. Iron-4.2g
  6. Zinc-2.3g
  7. Copper-72mg
  8. Tin-20mg
  9. Vanadium-20mg
  10. Chromium-14mg
  11. Manganese-12mg
  12. Molybdenum-5mg
  13. Cobalt-3mg
  14. Nickel-0.1mg

Different Classes of metals


  1. Base metals-Copper,Iron,Lead ,Zinc
  2. Precious metals-Gold,Platinum,Silver
  3. Light metals-Aluminium,Magnisium,Titanium
  4. Feroy alloy metals-Chromium,manganese,molybdenum,nickel,tungsten,Vanadium
  5. Electronic-mercury,silicon
  6. Nuclear-Plutonium,uranium



Alloys and their uses



SlNo. Alloy Composition Uses
1 Coinage bronze Copper,tin,zinc Copper coins
2 Dental gold Chromium,molybdenum,cobalt,titanium As an alternative to pure gold
3 Coinage silver Silver ,copper,lead Silver coins
4 Duralumin Aluminium,copper,magnesium,manganese Aircraft constructions
5 Nichrome Nickel,chromium,magnesium,iron,carbon or silicon Heating element
6 Maganin Copper,manganese or nickel Electrical resistors
7 Pewter Tin,lead, Domestic utensils
8 Soft solder Tin and led Soldering copper
9 Hard solder Copper&silver or zinc Hard brazing solders
10 Stainless steel Iron,chromium,nickel,fittings Cutlery and kitchen
11 Tool steel Hard steel with .9 to 1.4 percent carbon Cutting tools


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  1. Thattakadu –  Ernakulam
  2. Mangalavanum – Ernakulam
  3. Kumarakam – Kottayam
  4. Pakshipathalam – Wayanad
  5. Jadayupara – Kollam
  6. Ranganathittu – Karnataka(Mysore)
  7. Bharathpur – Rajasthan
  8. Vedanthankal – Tamilnadu


.Vitamins &  Chemical Names                                                      

  1. Vitamin A   – Retinol
  2. Vitamin D    -Calciferol
  3. Vitamin E    – Tocoferol
  4. Vitamin K    – Filloquinon
  5. Vitamin B1   -Thayamine
  6. Vitamin B2   -Riboflavin
  7. Vitamin B5   -Niacin/Nicotinic acid
  8. Vitamin B6    – Piridoxine
  9. Vitamin B9   – Folic acid
  10. Vitamin B12  – Cyanocobalamin
  11. Vitamin C   -Ascorbic acid


  1. Rat – 21 days
  2. Tiger – 98 to 109 days
  3. Dog – 60 days
  4. Lion – 105 days
  5. Cow – 270 days
  6. Human being – 280 days
  7. Gorilla – 8 to 9 month












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Cloning : Cloning is a method used to create genetically identical organisms. The commonly used method for this is Somatic Nuclear Transfer or SCNT. The mammal successfully cloned was a Sheep called Dolly, cloned at Rosalind Institute in Scotland in 1996 and was lived up to 2003. Ian Willmut led the research team. Recently, India also showed its   own technological perfection towards cloning. Samrupa , worlds first cloned Buffalo was created at the National Dairy Research Institute at Karnal ,  Haryana. It was born on February 6, 2009. The second cloned Buffalo ‘Garima’ was born in NDRI, on June 6, 2009. These were created through indigenous cloning technique.

List of some cloned animals

  1. Year Cloned animal
  2. 1952 Tadpole
  3. 1963 Carp
  4. 1996 Sheep-Dolly
  5. 2000 Rhesus Monkey –Tetra
  6. 2001 Gaur
  7. 2001 Cattle – Alpha and Beta
  8. 2001 Cat – Copy cat (CC)
  9. 2005 Dog – Snuppy
  10. 2003 Rat – Ralph
  11. 2003 Horse – Prometea
  12. 2009 Camel – Injaz


  1. Aerobiology – Study of airborne organic particles
  2. Anatomy – Study of internal structure and functions
  3. Arachnology – Study of spiders and scorpions
  4. Astrobiology – Study of distribution of life in the universe
  5. Batracology –Study of Amphibians
  6. Bionics – Application of biological designs in to engineering
  7. Bioinformatics – Use of information technology for storage of biological data
  8. Biotechnology –Commercial application of biology through techniques
  9. Chorology –  Study of spatial distribution of organisms
  10. Cryobiology – Study of effect of low temperatures on organisms
  11. Phycology – Study of algae
  12. Cryptozoology – Study of animals mentioned in myths , legends etc
  13. Cytology – Study of cells
  14. Dendrology – Study of trees
  15. Epidemiology – Study of factors effecting public health
  16. Ethology – Study of animal behavior
  17. Genetics – Study of genes and heredity
  18. Herpetology – Study of reptiles
  19. Histology – Study of tissues
  20. Ichthyology – Study of fish
  21. Lichenology – Study of lichens
  22. Limnology – Study of inland waters
  23. Morphology – Study of external structure and form
  24. Mycology – Study of fungi
  25. Oncology – Study of cancer
  26. Ophiology – Study of snakes
  27. Ornithology – Study of birds
  28. Pathology – Study of diseases
  29. Pomology – Study of fruits
  30. Carpolgy – Study of structure of fruits and seeds
  31. Physiology – Study of life functions and processes
  32. Palaeontology – Study of fossils
  33. Protistology – Study of protists
  34. Virology – Study of virus
  35. Xenobiology – Study of extra terrestrial life

Major bones in Humanbody

  1. Head – Cranium
  2. Upper jaw – Maxilla
  3. Lower jaw – Mandible
  4. Neck – Cervical vertebrae
  5. Shoulder bone – Scapula
  6. Collar bone – Clavicle
  7. Hind arm – Humerus
  8. Fore arm – Radius , Ulna
  9. Breast bone  – Sternum
  10. Hip bones – Pelvic girdle
  11. Wrist – Carpus
  12. Finger bones – Phalanges
  13. Thighbone – Femur
  14. Knee cap – Patella
  15. Leg bones – Tibia , fibula
  16. Angle bone – Tarsus
  17. Toe bones – Phalanges
  18. Heel – Calcaneus
  19. Innominate bones – Ilium , Ishium
  20. Inner ear bones – Malleus , Incus , Stapes















0 1016

Colours of vapour Lamps

  • Sodium Vapour Lamp-Yellow
  • Neon Vapour Lamp-Orange
  • Mercury Vapour Lamp-White
  • Nitrogen Vapour Lamp-Red
  • Hydrogen Vapour Lamp-Blue
  • Chlorine Vapour Lamp-Green


  • Atom Bomb-Autohan
  • Telescope-Galelio Galili
  • Logarithm-John Napier
  • Barometre-Toryselli
  • Vaccum Tube-John A Fleming
  • Revolver-Samual Co;t
  • X-ray-Rontgen
  • Dynamo-Micheal Farade
  • Helicopter-Etteni Omichan
  • Electric Battery-Alexander volt
  • Computer-Charles Babbage
  • Tyre-Dunlope
  • Motor car-Calbenze
  • Mobile phone-Martin Cooper
  • Jet Engine-Frank Vittil
  • Machine gun-Richard Gatling
  • Fountain pen-Louis Waterman
  • Dynamit-Alfred Nobel
  • Radar-Robert Watson
  • Umbrella-Samual Fox
  • Radio-Markony
  • Match box-John walker
  • Maser-C.H.Towns
  • Cosmic Rays-Victer Hest
  • Fridge-James Harison

Agricultural inventions

  • Tissue Culture-Haber land
  • Genetic code-Har Govind Khurana
  • Bordo mixture-Milar set
  • Tractor-B.Holt
  • H.Scale-Sorenson
  • Father of Genetics-Gregor Mendel
  • The father of modern medicine-Hippocrates
  • C-W.H.Karyar
  • Parachute-M.J.Garnarin
  • Baloon-Golfeyer Brothers
  • Super conductivity-Carmaling Ownes
  • Holography-Dennis Gaber
  • Gama Rays-Paul U williad
  • Nuclear reactor-E.Fermi
  • Galvano meter-Johan Sheeger

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Rare Questions asking for PSC Examinations

  1. The gas obtained from cow dung-Methane
  2. Pencillin is obtained from-Penecillium natatum
  3. The symbol of Md-stands for-Mendelevium
  4. Calcium sulphate is commonly called-Plaster of Paris
  5. The ship used by Darwin for his expedition-HMS Beagle
  6. Gonorrhoea is caused by-Neisseria gonorrhea
  7. Least corrosive metal is iridium
  8. The tendency of plants to grow towards the direction of the gravitational force-Geotropism
  9. The metal used in storage batteries is-Lead
  10. The gas formed as the result of fermentation –CO2
  11. Which scientist got Nobel prize both in Chemistry and Peace-Linus pauling
  12. Who discovered the infra red rays in sunlight-William Herschel
  13. The law of gravitation was propounded by-Sir Issac Newton
  14. Galileo’s first scientific discovery was-Pendulam
  15. Who used the word ‘rubber’ for the first time-Joseph Priestly
  16. Which organelle are known as the ‘suicidal bags of the cell’-Lysosome
  17. Latex is obtained from-Rubber tree
  18. Crescograph is used to measure the-rate of growth of a plant
  19. The system for writing by the blind people was invented by-Loise Braille

A plant adapted to live in dry places is called a-Xerophyte

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  • Which gas is found in soda water-Carbon dioxide
  • Which heavy metal causes itai itai disease-cadmium
  • Which chemical was used earlier for giving anesthesia to patients-Diethyl ether
  • What is the solvent of gold-Aquaregia
  • What are the ingradients of aquaregia-Concentrated Nitric Acid and Concentrated Hydrochloric acids
  • What is wood spirit-Methanol
  • Which alcohol is formed in wines-Ethanol
  • Name the chemical added to make tooth paste white-Titanium dioxide
  • What is added to gel tooth pastes to make them transparent-Hydrated silica
  • Which chemical is called salt peter-Pottassium nitrate
  • Which chemical is called Chile Salt peter-Sodium Nitrate
  • Which chemical is the reason behind the brown colour of human faces-Bilirubin
  • What is marsh gas-Methane
  • What is the chemical name of Chinese salt-Monosodium glutamate
  • Which is the purest form of carbon-Graphite
  • Which is called white poison-Sugar
  • Which is the simplest sugar-glucose
  • Which is the biological polymer in paper-cellulose
  • Which was the first widely used artificial aweetener-saccharin
  • What is the chemical name of saccharin-Ortho-sulphobenzimide
  • Which is the sweetest natural substances-Thaumatin
  • Which element is required for the synthesis of thyroid hormone in man-Iodine
  • Which is the heaviest noble gase-Radon
  • During world war which halogen was used as chemical weapon-Chlorine
  • Which compounds are used in tooth pastes to fight tooth decay-Fluorides
  • Which element has the highest melting point-Tungsten
  • Which element has the lowest melting point-Helium
  • Which is the lightest metal-Lithium
  • Which is the lightest element-Hydrogen
  • Which is the heaviest element in periodic table-Copernicium
  • Which is the main ingradient in super glue-Alpha cynaoacrylate
  • What is the main ingradient in nail polish remover-Acetone
  • What is the solidified carbon dio oxide called-Dry ice
  • Which metal oxide is the key ingradient of white paints-Titanium oxide
  • What are the sparkles in eye shadows and lipsticks made of-Mica
  • What is used as the base in eye shadows- Titanium dioxide
  • What is the main component of face powders-Talc
  • What is the chemical name of talc-Hydrated Magnesium Silicate
  • Which gas can turn clear lime water to milky-Carbon dioxide
  • Which gas is used in fire extinguishers- Carbon dioxide
  • Which metal find use in photography-Silver
  • What are the niptip of fountain pens made of-Osmium
  • Which element is kept under water-White Phosphorous
  • Which element is used in Kerosene-Sodium and Pottassium
  • What is the chemical used in cockroach balls-Naphthalene
  • Which chemical is used to embalm dead bodies-Formaldehide

0 398


  • Who is honoured as Father of Modern chemistry-Antoine Lavosier
  • What is the tabular display of elements in the order of increasing atomic number called-Periodic Table
  • Who invented periodic table-Dmitri Mendeleev
  • Which is the most abundant gas in the atmosphere-Nitrogen(785)
  • Which gas evolves from paddy fields and marshes-Methane
  • Which gas causes the acid rain-Sulphur dioxide Nitrogen Oxide
  • Which metal is used in the making of microchips-Silicon
  • What is the toxicity caused by silicon called-Silicosis
  • Which toxic gas caused Bhopal gas tragedy-Methyl Isocynate
  • What is the chemical name of Vitamin E-Alpha Tocopherol
  • Which vitamin is also known as retinol-Vitamin A
  • What is calciferol-Vitamin D
  • What is the other name of thiamine-Vitamin B1
  • Which vitamin is called niacin-Vitamin B3
  • Which element is excreted through human sweat-Sulphur
  • Which polymer is used to manufacture electric switches,computer disk-Bakelite
  • With which polymer the cabinet of radio and TV made of-Polystyrene
  • Which chemical is used to make rai coats-Poly vinyl chloride
  • Which type of plastics can be recycled-Thermoplastics
  • Pollution of water bodies by which element causes Minamata disease-Mercury
  • Which element is liquid at ordinary temperature-Mercury
  • What is the chemical name of baking soda-Sodium bi carbonate
  • Accumulation of which chemical leads to kidney stones-Calcium Oxalate
  • What is sodium chloride-Table salt
  • Which is the element present in lead pencils-Carbon(Graphite)