Electrons revolve around the nucleus in a fixed path called orbits. This concept related to?
 A) Rutherford
 B) J.J. Thomson
 C) Dalton
 D) Niels Bohr

Rutherford

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Which among the following fuels given has the highest calorific value?
 A) Petrol
 B) Carbon
 C) Ethanol
 D) Hydrogen

Hydrogen

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Which reducing agent is used for the extraction of highly reactive metal from their ores?
 A) CO₂
 B) CO
 C) Electricity
 D) Carbon

Carbon

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Which glass is used for making lenses and prisms?
 A) Hard glass
 B) Flint glass
 C) Soda glass
 D) Borosilicate glass

Flint glass

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In which of the following condition does the evaporation of water takes place?
 A) Only at 100°C
 B) Only above 100°C
 C) At all temperatures
 D) Only below 100°C

Only above 100°C

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The scientist who arranged the elements, in their increasing order of atomic weight is?
 A) Mendeleev
 B) Dalton
 C) Avogadro
 D) Mendel

Mendeleev

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Planck's constant has the dimenisons of ?
 a) force
 b) linear momentum
 c) angular momentum
 d) energy

angular momentum

Iron filings can be separated from a heterogenous mixture using the technique of ?
 a) Evaporation
 b) Sublimation
 c) Magnetization
 d) Sedimentation

Magnetization

Which is the most abundant metal in the human body ?
 a) Iron
 b) Calcium
 c) Phosphorous
 d) Oxygen

Calcium

Water gas is a mixture of carbon monoxide and ?
 a) Nitrogen
 b) Carbon dioxide
 c) Sulphur dioxide
 d) Hydrogen

Hydrogen

which of the following element contains in Bleaching powder ?
 a) Nitrogen
 b) Bromine
 c) Iodine
 d) Chlorine

Chlorine

The number of groups in the modern Periodic table is ?
 a) 16
 b) 18
 c) 20
 d) 21

18

Cyanide poisoning causes death in seconds because ?
 a) It denatures enzymes of the heart muscle
 b) It causes cardiac arrest
 c) It causes lysis of red blood cells
 d) It breaks the electron transport chain

It causes cardiac arrest

Which type of colloidal solution is formed by a solid dispersed phase in a liquid dispersed medium ?
 a) Emuslion
 b) Sol
 c) Foam
 d) Gel

Sol

The oxidation number of sulphur in sulphuric acid ?
 a) 2
 b) 4
 c) 6
 d) 8

6

The substance used both as moderator and coolant in nuclear reactors is ?
 a) Ordinary water
 b) Heavy water
 c) Liquid ammonia
 d) Liquid hydrogen

Heavy water

The elements which show variable valency ?
 a) inert gas
 b) non metals
 c) d block elements
 d) s block elements

d block elements

Which metal is called the ‘Jack of all trades’ ?
 a) Aluminium
 b) Iridium
 c) Iron
 d) Manganese

Manganese

Which is the first artificial plastic ?
 a) Polythene
 b) Nylon
 c) Terylene
 d) Bakelite

Bakelite

Breath analysers used by police to test drunken drivers works on the chemical basis of ?
 a) Acid base reactions
 b) Precipitation reactions
 c) Complexation reactions
 d) Redox reactions

Redox reactions