Science General Knowledge (GK) Questions with Answers

Science General Knowledge Questions with Answers

*Tetraethyl lead is used as
A.pain killer
B.fire extinguisher
C.mosquito repellent
D.petrol additive

Ans:    petrol additive

*Which of the following is used as a lubricant?
A.Graphite
B.Silica
C.Iron Oxide
D.Diamond

Ans: Graphite

*The gas usually filled in the electric bulb is
A.nitrogen
B.hydrogen
C.carbon dioxide
D.oxygen

Ans: Nitrogen

*Washing soda is the common name for
A.Sodium carbonate
B.Calcium bicarbonate
C.Sodium bicarbonate
D.Calcium carbonate

Ans: Sodium carbonate

*Quartz crystals normally used in quartz clocks etc. is chemically
A.silicon dioxide
B.germanium oxide
C.a mixture of germanium oxide and silicon dioxide
D.sodium silicate

Ans:silicon dioxide

*Which of the gas is not known as green house gas?
A.Methane
B.Nitrous oxide
C.Carbon dioxide
D.Hydrogen

Ans:Hydrogen

*Bromine is a
A.black solid
B.red liquid
C.colourless gas
D.highly inflammable gas

Ans:red liquid

*Brass gets discoloured in air because of the presence of which of the following gases in air?
A.Oxygen
B.Hydrogen sulphide
C.Carbon dioxide
D.Nitrogen

Ans:Hydrogen sulphide

*Which of the following is used in pencils?
A.Graphite
B.Silicon
C.Charcoal
D.Phosphorous

Ans:Graphite

*Which of the following metals forms an amalgam with other metals?
A.Tin
B.Mercury
C.Lead
D.Zinc

Ans:Mercury

*The group of metals Fe, Co, Ni may best called as
A.transition metals
B.main group metals
C.alkali metals
D.rare metals

Ans:transition metals

*Heavy water is
A.deuterium oxide
B.PH7
C.rain water
D.tritium oxide

Ans:deuterium oxide

*In which of the following activities silicon carbide is used?
A.Making cement and glass
B.Disinfecting water of ponds
C.cutting very hard substances
D.Making casts for statues

Ans:cutting very hard substances

*When an iron nail gets rusted, iron oxide is formed
A.without any change in the weight of the nail
B.with decrease in the weight of the nail
C.with increase in the weight of the nail
D.without any change in colour or weight of the nail

Ans:with increase in the weight of the nail

*The gases used in different types of welding would include
A.oxygen and hydrogen
B.oxygen, hydrogen, acetylene and nitrogen
C.oxygen, acetylene and argon
D.oxygen and acetylene

Ans:oxygen and acetylene

*Among the various allotropes of carbon,
A.coke is the hardest, graphite is the softest
B.diamond is the hardest, coke is the softest
C.diamond is the hardest, graphite is the softest
D.diamond is the hardest, lamp black is the softest

Ans:diamond is the hardest, graphite is the softest

*What is laughing gas?
A.Nitrous Oxide
B.Carbon monoxide
C.Sulphur dioxide
D.Hydrogen peroxide

Ans:Nitrous Oxide

*Actinides are the elements with atomic numbers from
A.97 to 104
B.101 to 115
C.89 to 103
D.36 from 43

Ans:89 to 103

*Soda water contains
A.carbonic acid
B.sulphuric acid
C.carbon dioxide
D.nitrous acid

Ans:    carbon dioxide

*Non stick cooking utensils are coated with
A.Teflon
B.PVC
C.black paint
D.polystyrene

Ans:Teflon

*Carbon, diamond and graphite are together called
A.allotropes
B.isomers
C.isomorphs
D.isotopes

Ans:allotropes

*Most soluble in water is
A.camphor
B.sulphur
C.common salt
D.sugar

Ans:sugar

*Permanent hardness of water may be removed by the addition of
A.sodium carbonate
B.alum
C.potassium permanganate
D.lime

Ans:sodium carbonate

*From which mineral is radium obtained?
A.Rutile
B.Haematite
C.Limestone
D.Pitchblende

Ans:Pitchblende

*Which of the following are the ingredients of gun metal?
A.Iron, Zinc, Titanium
B.Iron, tin
C.Iron, Brass, Tin
D.Copper, Tin

Ans:Copper, Tin

*The two elements that are frequently used for making transistors are
A.boron and aluminium
B.silicon and germanium
C.iridium and tungsten
D.niobium and columbium

Ans:silicon and germanium

*Diamond is an allotropic form of
A.germanium
B.carbon
C.silicon
D.sulphur

Ans:carbon

*Permanent hardness of water can be removed by adding
A.chlorine
B.washing soda
C.potassium permanganate
D.bleaching powder

Ans:washing soda

*LPG consists of mainly
A.methane, ethane and hexane
B.ethane, hexane and nonane
C.methane, hexane and nonane
D.methane, butane and propane

Ans:methane, butane and propane

*Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
A.Television
B.Refrigerator
C.Tube light
D.Cooking gas

Ans:Refrigerator

*Which of the following does not contain a coinage metal?
A.Silver and Gold
B.Zinc and Gold
C.Copper and Silver
D.Copper and Gold

Ans: Zinc and Gold

*The main constituents of pearls are
A.calcium oxide and ammonium chloride
B.calcium carbonate and magnesium carbonate
C.aragonite and conchiolin
D.ammonium sulphate and sodium carbonate

Ans: calcium carbonate and magnesium carbonate

*Amalgams are
A.highly colored alloys
B.alloys which contain mercury as one of the contents
C.alloys which have great resistance to abrasion
D.alloys which contain carbon

Ans: alloys which contain mercury as one of the contents

*Bell metal is an alloy of
A.nickel and copper
B.zinc and copper
C.brass and nickel
D.tin and copper

Ans: tin and copper

*Water is a good solvent of ionic salts because
A.it has a high specific heat
B.it has no color
C.it has a high dipole moment
D.it has a high boiling point

Ans: it has a high dipole moment