English Word Meaning for PCS,PMS & CSS Exams

English Word Meaning For PCS,PMS & CSS Exams

Abbreviation A shortened form of a word or phrase
Abolish Do away with wholly
Accelerate To increase the speed; to hasten the progress of
Accountable Liable to be called to account
Actuary One who calculates premium
Adolescence The period between childhood and adulthood
Aggravate To increase the gravity of an offence or the intensity of a disease
Aggressor A person who attacks first
Agnostic One who doubts the existence of god
Alienate To turn friends in enemies
Altruist A person who loves every body
Amateur One who does something not professionally but for pleasure
Ambidextrous Of a person who can use both hands equally well
Ambiguous A sentence whose meaning is unclear
Ambivalent Having opposing feelings
Amnesty General pardon
Amphibian A land animal that breeds in water
Anarchist One who is out to subvert a government
Anarchy Absence of government
Anonymous A book written by an unknown author
Answerable A person liable to be called to account for his action
Antedate To date before the true time
Anthropology A study of man
Antidote A medicine to counteract the effect of another medicine
Antiseptic A medicine that prevents decomposing
Antonym A word opposite in meaning to another
Appreciate To rise in value
Arbitrator A person appointed by parties to settle the disputes between them
Archaeology A study of ancient things
Aristocracy A Government by the Nobles
Arsenal A place where weapons and ammunitions are stored
Atheist One who does not believe in the existence of God
Audience An assembly of hearers at a lecture or concert
Auditor One who makes an official examination of accounts
Autobiography A life history written by oneself
Autocracy A Government by one
Avaricious Of a person extremely desirous of money
Behead Cut off the head
Bibliophile A great lover of books
Bigamy Practice of having two wives or husbands
Bigot One who has narrow and prejudiced religious views
Bilingual A person who speaks two languages
Biography A life history written by somebody else
Biology The science which treats with life
Botany The branch of biology dealing with plant life
Brittle Hard but liable to be easily broken
Bureaucracy A Government by the officials
Callous A man devoid of kind feeling and sympathy
Cannibal Of a man or animal that feeds on its own species
Carnivorous A flesh eating animal
Catalogue A list of books
Celibacy Abstinence from sex
Celibate One who is unmarried
Centenarian A person who is above hundred years
Centenary Celebration of a hundredth year, once –a-century
Colleague A co-worker or a fellow-worker in the same institution
Congenital Belonging or pertaining to an individual from birth
Contemporaries People living at the same time
Contemporary Belonging to the same period of time
Convalescent One who is recovering from illness
Cosmology Science of origin of universe
Cosmopolitan One who can make himself at home in all countries
Cosmopolite A citizen of the world
Credulous A person who readily believes whatever is told to him/her.
Cynic One who questions everything
Delegate To give one
Democracy Government of the people, for the people, by the people
Depreciate To go down in value
Deteriorate To go from bad to worse
Disenfranchisement To take away some one
Draw A game in which neither party wins
Drawn/ Tie A game or batter in which neither party wins
Word Meaning
Eccentric One who has strange habits
Ecology Study of environment
Edible A thing that is fit to be eaten
Effeminate Of a man showing feminine attributes
Egotist A person who always thinks of himself ; somebody who is selfish or self-centered
Eligible One who is qualifies for election
Elucidate To explain something mysterious or difficult
Embezzlement Misappropriation of money
Emphasize To lay special stress on
Epicure Somebody who has refined taste for food; somebody who loves sensual pleasure and luxury
Epidemic A contagious disease which spreads over a huge area
Epitaph Inscription on a tombstone
Equestrian A person who rides on horse-back
Equilibrium A state of perfect balance
Eradicate Destroy or get rid of something completely; root out an evil or bad practice
Ethnology A study of races
Etiquette Established rules of conduct; rules of acceptable behavior
Etymology A study of derivation of words
Exonerate Free somebody from blame or guilt
Extempore A speech delivered without any previous preparation
Facsimile An exact copy
Fanatic A man who has too much enthusiasm for his own religion
Fastidious A person difficult to please
Fatal Anything that leads to death
Fatalist A person who believes in fate
Feminist One who thinks only of welfare of women
Foregone Something that has been determined beforehand
Fratricide The murder or murderer of one
Germicide A medicine that kills germs
Glutton One who eats too much
Gratis Without payment
Gregarious Of animals living in flocks
Gullible One who is easily deceived
Herbivorous A grass eating animal
Homicide Murder of a human being
Honorary A position for which no salary is paid
Hostility Intense aggression or anger state of antagonism
Humanitarian One who feels sympathetic towards human beings
Hung Assembly or parliament in which no party has got clear majority
Hypocrite One who pretends to be what he is not
Idiosyncrasy A person’s peculiar habit
Idolatry Worship of idols
Illegal That which is against law
Illegible A handwriting that cannot be read
Illicit That is prohibited by law
Illiterate A person who cannot read or write
Immigrant One who lives in a foreign country
Imperceptible That which cannot be noticed
Impervious A person who remains unmoved and unaffected by other people’s opinions, suggestions
Impracticable That which cannot be practiced
Impregnable Incapable of being seized by attack
Improbable That which is not likely to happen
Inanimate Without life
Inaudible A sound that cannot be heard
Incomprehensible A statement which cannot be understood
Incorrigible One who cannot be corrected
Incredible That which cannot be believed
Incurable That which cannot be cured
Indefatigable One incapable of being tired
Indefensible That which cannot be defended
Indescribable That which cannot be described
Indispensable Something that is essential and cannot be dispensed with
Inevitable That which cannot be avoided
Inexplicable That which cannot be explained
Infallible A remedy which never fails
Infanticide The act of killing an infant
Inflammable Something that is quickly and easily set on fire and burned
Inimitable A method that cannot be imitated
Insatiable That which cannot be satisfied
Insoluble Incapable of being dissolved in a liquid
Insolvent One who is unable to pay his debts
Intestate One who dies without a Will
Introspection The action of looking back on past time
Invincible That which cannot be conquered
Invisible A thing that cannot be seen with human eyes
Invulnerable That which cannot be hurt
Irrelevant Not applicable
Irreparable A loss of damage that cannot be compensated
Irrevocable That cannot be altered or withdrawn
Irritable A man who is easily irritated
Jurisdiction The area over which an official has control
Word Meaning
Legal That which is lawful
Maiden The first speech made by a person
Manuscript Handwritten book
Matinee A cinema show which is held in the afternoon
Matricide Killing of one’s own mother; killer of one’s own mother
Medieval Belonging to the Middle Ages
Mercenary One who can do anything for money
Misanthrope One who hates mankind
Misanthropist Hater of mankind
Misogamist A person who does not believe in the institution of marriage
Misogynist A person who hates women
Mobocracy Rule by the mob
Monarchy A Government by a king or queen
Monogamy Practice of having one wife or husband
Namesake Somebody or something with the same name as somebody or something else
Neophyte One who is a newcomer
Notorious A person with an evil reputation
Novice One who is new to a trade or profession
Numismatics Science of coins or medals
Obsolete A thing no longer in use
Oligarchy A Government by the few
Omnipotent All-powerful; possessing complete power and authority
Omnipresent One who is present everywhere
Omniscient A person who knows everything
Omnivorous An animal or a human being that eats any kind of food
Opaque That through which light cannot pass
Optimist One who looks at the bright side of things; somebody positive
Ornithology A study of birds
Orphanage A place where orphans live
Panacea A supposed cure for all diseases or problems
Parasite A person supported by another and giving him/her nothing in return
Patricide Killing of one’s own father; killer of one’s own father
Pauper One who has no money
Pedestrian One who goes on foot
Pessimist One who looks on the dark side of things
Philanthropist Lover of mankind
Philistine One who does not care for art, literature etc
Physiology A study of the body
Plagiarist One who copies from other writers
Plutocracy A Government by the rich
Polyandry Practice of having several husbands
Polygamy Practice of having several wives
Polyglot One who knows many languages
Posthumous A book published after the death of its author
Postmortem Medical examination of a dead body
Postscript A short message added on to the end of a letter after the signature
Potable Water fit for drinking
Predator An animal who preys on other animals
Psephology Systematic study of election trends
Pseudonym To write under a different name
Regicide Murder of the king
Reticent One who speaks less
Sacrilege Violating the sanctity of a church
Samaritan One who helps others Good
Sinecure An office with high salary but no work
Smuggler A person who imports or exports goods into or from a country secretly because they are illegal or in order to avoid paying duty on them
Soporific A drug or other substance that induces sleep
Stoic One who is indifferent to pleasure or pain
Suicide Murder of self
Synonyms Words which have the same meaning
Theist One who believes in God
Translucent That through which light can partly pass
Transparent That through which light can pass
Turncoat One who changes sides
Valetudinarian One who always thinks himself to be ill
Vandal One who damages public property
Vegetarian Somebody who doesn’t eat meat or fish
Venial A pardonable offense
Ventriloquist One who can throw his voice
Veteran Somebody who is considerably experienced in something
Volunteer One who works for free
Zoology A study of animals
Zoology The branch of biology dealing with the study of animals

English Word Meaning For PCS,PMS & CSS Exams

Mathematics Mcqs Practice Test

Mathematics Mcqs Practice Test

1
-1
4

 {1, 2, 3, 4, 5, 6 ……………….} is called as the set of …..

Prime numbers
Whole numbers
Naturat numbers
Irrational numbers

Every recurring decimal represents

a natural number
a rational number
an irrational number
a whole number

1.4142135… is ………………….

a natural number
a rational number
a prime number
a rational number

if log X =3 then X = ……..

125
500
25
625

(3 -12 1/2 = ……..

-6
6
-12
12

a prime number
an integer
a whole number
an irrational number

if tan A and sin A are both smaller than 0, then A may lie in

the 1st quadrant
the 2nd quadrant
the 3rd quadrant
the 4th quadrant

if (2 , 3 ) and (2, ,5) are end points of diameter of a circle then the center of the circle is ..

( 2 , 4)
( 4 , 8 )
( 0, 2)
(0, -2)

If x-a is a factor of polynomial p(x), then p(a)=?

Divisor
Quotient
Remainder
N.O.T

A binary operation * in Q defined by a * b by a * b + 4a.b the inverse of 1/12 is =?

3/4
1/4
1/12
N.O.T

Anon-terminating, none-recurring decimal represent

a natural number
a rational number
an irrational number
a prime number

The number of complex cube roots of unity is

One
two
three
four

The set R-{0} of rea numbers is closed w. r. t?l

Addition
Multiplication
Division
A .O. T

The equation of circle with center origin and radius r is …

x ² + y ² = 1
x ² + y ² = r ²
x ² + y ² = 0
x ² – y ² = r ²
 

Mathematics Mcqs Practice Test

Botany Mcqs Practice Test

Botany Mcqs Practice Test

The osmosis means

flow of solutes from low concentration to higher concentration
flow of solutes from higher concentration to low concentration
flow of solvents from low concentration to high concentration
flow of solvent from high concentration to low concentration

Water is absorbed through the root hairs by means of :

respiration
tugor pressure
transpiration
osmosis

A land biome is identified primarily by its

climax vegetation
pioneer organisms
dominanant animals
food chains

Radial vascular bundles occur in:

monocot stem
dicot stem
monocot leaf
monocot root

Transpirational pull in land plants is a physical factor associated with upward transport in the

phloem
cambium
xylem
cotyledon

Plants cells differ from animals cells in which one important way?

plants cells all possess chlorophyll
plants cells have a large central vacuole
plants cells are bigger
plants cells are not so specialized

The edible fungi are

rusts
carrot
Mildews
mushrooms

The vacule of a plant cell contains

water
cytoplasm
the nucleus
water plus dissolved chemical

Transpiration takes place from:

steam
leaves
all parts of the plants
only arial part of the plant

Atibiotics are mostly produced commerciatty from?

bacteria
viruses
algae
fungi

The presence of lignin in the cell wall is the characteristic feature of:

woody tissue
phloem
soft tissue
cortex

genes are made of:

histone
polynucleotides
hydrocarbons
Lipoprotein

The path of translocation of mineral ions in the plant is through:

cortex
phloem
pith
endodermis

Wilting of a plant results from excessive:

absorption
phytosynthesis
respiration
transpiration

The process in which water is split during photosynthesis is

photolysis
plasmolysis
hydrolysis
hemolysis
 

Botany Mcqs Practice Test

General knowledge Mcqs Practice Test

General Knowledge Mcqs Practice Test

The predominant language spoken in the Holland is ?

Dutch
French
English
Flemish

Which of the following is a blood group known as Universal Doner

B
A
AB
O

What is the abbreviation of CIA?

Central Intelligence Agency
Chamber of Commerce and Industry
Coordinating Committe on Services
Cooper Development Center

Which one of the following is not neighboring country of Libya

Egypt
Tunisia
Iraq
Sudan

Which one of the following is 2nd highest mountain on the earth

Makalu
Cho Oyu
Mount Everest
K2

What is the currency of Nepal?

Rupee
Kina
Ruble
Peso

Which country celebrates it’s Independence day on 15th August, apart from India ?

Burkina Faso
South Korea
Central African Republic
Chad

The term `Knock Out’ is associated with?

swimming
riding
jumping
Boxing

What is the capital of Gambia?

Conakry
George Town
Banjul
Seoul

The capital of Uzbekitan is?

Tashkent
Bogota
Addis Ababa
Malabo

The first man to set foot on the Moon

Konarov
Neil Armstrong
Edwin Aldrin
None of the these

Rabat is the capital of?

America
Morocco
Grenada
Haiti

who is inventor of Telephone ?

Joseph Henry
Thomas Edison
Elisha Gray
Graham Bell

The first Olympic games were held in

Spain
chine
Athens
Australia

The capital of Netherlands is?

Free Town
Madrid
victoria
Amsterdam
 

General Knowledge Mcqs Practice Test

English Mcqs Practice Test

English Mcqs Practice Test

What is antonyms of word Torsion

straightening
talk
turn
emotion

Complete the following sentence
This is the best book

of all others on History
of any other on History
of all on History
of any other in History

What is antonyms of word Iniquity

cruelty
injustice
equitable
intensity

Complete the following sentence
No sooner did the thief see the policeman

he ran away
he had run away
when he ran away
than he ran away

What is antonyms of word Stubborn

suborn
obstinate
ductile
stub

Complete the following sentence
He is a

fine, young, tall energetic man
young, fine, tall & energetic man
tall, young, energetic & fine man
fine, tall, young & energetic man

What is synonyms of word Foray

fire
brightness
lineage
dump-founded

Complete the following sentence
If I were not busy, I

shall go with you
will go with you
would have gone with you
would go with you

Complete the following sentence
What do you

say to a cup of tea
tell a cup of tea
utter to a cup of tea
narrate a cup of tea

Complete the following sentence
I dont agree with you; I think

it is fairly good film
it is rather a good film
it is rather fairly good film
it is fairly rather good film

Complete the following sentence
It is time that

the children go to bed
the children went to bed
the children go to their bed
the children went to their bed

Complete the following sentence
Hardly

he reached the college, it began to rain
we reached college, then it began to rain
we reached college, when it began to rain
had we reached the college, when it began to rain

Pick the correct response from following sentence
I always praise him for his merits, but he always turns …………. you pointing out your demerits

at
to
on
for

What is antonyms of word Restoration

lexicon
balm
hoarding
depredation

What is synonyms of word Nightmare

story
journey
incubus
owl
 

English Mcqs Practice Test

Physics Mcqs Practice Test

Physics Mcqs Practice Test

The study of photoelectric cell is useful in understanding of:

Bohr`s atomic model
Compton effect
Quantum nature of light
None of these

A negative magnification always means that the image is:

erect
real
virtual
inverted

The phenomenon of radioactivity is associated with :

decay of nucleus
decay of atoms
fusion of nuclei
emission of electrons

The direction of velocity of a body cannot change when its acceleration is constant. the statement is?

true
false
uncertain
None of these

Which of the following is used as a fuel in a nuclear reactor?

water / heavy water
lead / aluminum
lead / cadmium
plutonium / uranium

What determines longitudinal chromatic aberration of a lens

Dispersive power only
Focal length only
Both dispersive power only
None of these

The flow of heat from a hot two a cold body is an example of

adiabatic process
irreversible process
reversible process
isothermal process

Particles which can be added to the nucleus of an atom without changing its chemical properties are called

electrons
protons
neutrons
alpha particles

When a conductor situated in a dielectric is charge the energy resides:

only on the dielectric
only on medium surrounding charge
only on the dielectric and medium both
only on the electric or medium surrounding charging

Thermocouple is an arrangement of two differet metals

to convert heat energy onto electric energy
to produce more heat
to convert heat energy into chemical energy
to convert electrical heat t energy

select the one that is paramagnetic?

bismuth
chromium
water
mercury

Parallel rays of light are focused by a thin convex lens. A thin concave lens of the same focus lenth is then joined to the convex lens. The focal point will

Shift to infinity
shift towerds the lens by a small distance
shift away from the lens by a small distane
remain at its original position

Echose arise from

reflection
refection
diffraction
dispersion of sound waves

The current in a photoelectric tuble

decrease with increase in frequency of the incident photons
increase with increase in frequency of the incident photons
decrease with increase in intensity of illumination
increase with increase in intensity of illumination

The quality of a tone:

decreased with loudness
varies directly as pitch
varies inversely as its as frequency
depends upon the overtones that are present there
 
 

Physics Mcqs Practice Test

Botany Mcqs Practice Test

Botany Mcqs Practice Test

What should happend if thin sliec of suger beet is plased in a concentrated solution of sodium cloride?

it should lose water from the cells
It should become turgid
it should niether absorb water nor lose water
it should absorb water from salt solution

Saprophytes break down dead organic mater by secreting

hormones
enzymes
auxin
bacteria

The presence of lignin in the cell wall is the characteristic feature of:

woody tissue
phloem
soft tissue
cortex

Stomata in moss are present in

leaf
stem
lower part of capsule
uper part of capsule

Transpiration takes place from:

steam
leaves
all parts of the plants
only arial part of the plant

The size of the stomates in a leaf is controlled by the

xylem cells
phloem cells
guard cels
heterotrophic cells

Why cambium is considerd a lateral meristem?

Because it gives rise to lateral branches
Because it increase the birth of the plant
Because it increase the length of the plant
Because it increase the height and the diameter of the plant

in respiration pyruvic acid is

Formed only when oxygen is available
product of glycolysis
broken doun into carbon fragment
a result of protein breakdown

Opning of stomata is due to:

turgidity of guard cells
size of guard cells
number os guard cells
amount of corbon_dioxide in atmosphare

The tissue responsible for translocation of food material is:

Vessels
sieve tubes
parenchyma
fibres

Which of the following is a rapid type of absorption?

passive absorption
active absorption
salt absorption
root tip absorption

The vasculer bundles are surrounded by a scelrenchymatous sheath is:

dicot stem
monocot stem
dicot root
monocot stem

The living part of plant cell is called?

cell wall
protoplasm
hyloplasm
cell sap

If genes for two different traits are located on the same chromosome , they are said to be

allelic
linked
segregated
intermediate

Radial vascular bundles occur in:

monocot stem
dicot stem
monocot leaf
monocot root
 

Botany Mcqs Practice Test

Physics Mcqs Practice Test

Physics Mcqs Practice Test

Physical quantity not directly involved in rotatory motion is:

moment of inertia
mass
angular velocity
torque

When a helium loses an electron it becomes

an alpha particle
a proton
a positive helium ion
a negative helium ion

A small and a large rain drops are failing through air:

large drop moves faster
both move with same velocity
small drop fall faster
None of these above

A body can have zero velocity and still be accelerating

True
False
We cannot say unless the mass of the body is known
None of these

The carnot cycle is a

reversible cycle process woth two isotherms and two adiabats
constant pressure cycle
cnstant volume cycle
a reversible two stroke cycle

When light passes closed the edge of any object, it is bent in its paht and travels in a new direction this bending of light arround corners is called

refraction
polaristio
diffraction
interference

whenever a system is made to complete a cyclic process , the work done during the complete cycle

is Zero
positive
is negative
depends upon the path followed

A potentiometer can not be used for the measurement of

current
voltage
internal resistance of cell
dielectric constant

The amount of charge which can be placed on a conductor does not depend on

the dialectic strength of the surrounding medium
its capacitance
its potential
its size or ship

Thermocouple is an arrangement of two differet metals

to convert heat energy onto electric energy
to produce more heat
to convert heat energy into chemical energy
to convert electrical heat t energy

What is the radius of first Bohr`s orbit for z=5?

0.53A
0.106A
2.65A
None of these

Heat produced by friction is transferred by

conduction
radiation
convection
all of these

interference of light waves results in alternate areas of minimum and maxium intensity means that

energy at dark spots has been destroyed
energy at the bright spots has been created
there is transfer of energy from dark to bright region
average energy medium is reduced

What determines longitudinal chromatic aberration of a lens

Dispersive power only
Focal length only
Both dispersive power only
None of these

When impurities are added to metal, they

will decrease the elasticity
will increase the elasticity
will not change the elasticity
will or will not change the elasticity
 

Physics Mcqs Practice Test

Computer Science MCQs Practice Test

Computer Science MCQs Practice Test

Intel stands for ?

Select appropriate answer from following

intermediate language
international telephone
integrated electronics
intermediate electronics

In Microsoft windows key F1 is mostly used for

Select appropriate answer from following

Help
Save
New
Exit

(10111) = (?) 10

Select appropriate answer from following

23
50
24
89

Which one of the following is not an Object oriented programming language

Select appropriate answer from following

PHP
C#
JAVA
C

Physical components of computer are called

Select appropriate answer from following

software
hardware
database
terminals

RAM is also known as

Select appropriate answer from following

volatile memory
register memory
seconday memory
cache memory

JPG stands for ?

Select appropriate answer from following

Joint Photography
Journal Photography
Journal Photo Experts Group
Joint Photographic Experts Group

UNICODE is an example of

Select appropriate answer from following

character encoding set
driver
software
database

FF is example of

Select appropriate answer from following

Octal number system
Binary Number System
Decimal Number System
Hexadecimal number system

The base of binary language is

Select appropriate answer from following

2
4
8
16

Emails are sent with the help of ?

Select appropriate answer from following

SMTP
FTP
HTTP
UDP

A plotter is an

Select appropriate answer from following

a storage device
an input device
a software
an output device

SATA standers for ?

Select appropriate answer from following

Sequential Advanced Technology Attachment
Serial Advanced Technology Attachment
Serial Automatic Technology Attachment
Super Advanced Technology Attachment

If you have an image with 2 colors , what image format should be used to get minimum file size

Select appropriate answer from following

GIF
PNG
TIFF
BMP

The main components of a computer system are

Select appropriate answer from following

TAP, CPU, Printer
CPU, Input device
CPU, ALU, CU
CPU , Output device , Memory unit, Control unit

Which image format supports transparency in images

Select appropriate answer from following

PNG
GIF
JPG
A & B
 

Computer Science MCQs Practice Test

Chemistry Mcqs for All Public Service Exams

Chemistry Mcqs For All Public Service Exams

The temprature at which a gas liquefies under 1 atm of pressure is called the

Select appropriate answer from following

critical temprature
boilig point
normal boiling point
triple point

A real gas is one in which:

Select appropriate answer from following

gases shows deviation from gas laws
volume of the molecules become significant
attraction beteen molecules exists
All are correct

The mechanism of the dehydration of an alkene involves

Select appropriate answer from following

carbanion formation
hydride ion transfer
free radical formation
carbonium ion formation

Elements with same electronic configration in their outermost occupies energy level have

Select appropriate answer from following

Different physical and chemical properties
Same physical and chemical properties
similar physicsl and chemical properties
same atomic radii

THe formula which represent the simplest ratio of atom is:

Select appropriate answer from following

Molecular formula
Empirical formula
Structural formula
none of the above

Molecule in which the disteen between the two adjective carbon atoms is largest is:

Select appropriate answer from following

ethane
ethene
ethyne
benzene

Which of the following atoms would be dimagnetic:

Select appropriate answer from following

O
Al
K
Ne

Astatine is the element below iodine in group.VII of the periodic table.which one of the following predictions about chemistry of astatine and its compounds id likelyto be correct

Select appropriate answer from following

Asfatine is a solid at room temperature
Asfatine is more reactive than iodine
Hydrogen astatide is a weak acid
Hydrogen astatide is thermally stable

Which is the sweetest of all the suger?

Select appropriate answer from following

fructose
glucose
lactose
sucrose

IF gasses is cooled suddenly then it becomes

Select appropriate answer from following

brittle
malleable
soft
transparent

Enthalpy is a/ an:

Select appropriate answer from following

extensive property
intensive property
state function
A & B are correct

Presence of hydrogen bonding between molecules of a substance result:

Select appropriate answer from following

increase in melting point
increase in density
slow the rate of evaporation
all fo the above

Dry ice is

Select appropriate answer from following

ice wich has been dried with the help of filter paper
solid carbon dioxide
solid sulpher dioxide
ice found on mountains

A system interacts readily with its sorrounding, exchanging matter and energy; the system is:

Select appropriate answer from following

an open system
a closed system
an isolated system
None of these

Chemical composition of pearl is:

Select appropriate answer from following

calcium carbonate
calcium sulphate
calcium carbonate and magnesium carbonate
calcium chloride

Which compound has the highest boilling point?

Select appropriate answer from following

HI
HBr
HCL
HF.

Sodium ions do not react with water sine:

Select appropriate answer from following

they are positively charged
the possess a stable electrons configuration
they are soluble in water
they are chemical unreactive

Oxygen atom in R. O. R has ………………… unshared electrons pair.

Select appropriate answer from following

one
two
three
four

…………… bond is formed due to parallel overlapping of atomic orbital is:

Select appropriate answer from following

sigma bond
pi bond
super bond
ionic bond

Which of the following is used for the manufacture of synthetic petroleum

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aromatisation
cracking
fischer-troopsch process
fractional distillation

Calculate the percentage of oxygen in heavy water?

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80%
60%
50%
20%

Which of the following groups have + I group

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Alkyl
Halogen
Phenyl
Nitro

One can ignore attractive forces and size effect in a gase at:

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high pressure
low temperature
low temperature and high temperature
low temprature and high pressure

15 liters of hydrogen combine with nitrogen to produce ammonia. the volume of ammonia in litres formed is:

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10 liters
5 liters
8 liters
12 liters

Astatine is the element below iodine in group.VII of the periodic table.which one of the following predictions about chemistry of astatine and its compounds id likelyto be correct

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Asfatine is a solid at room temperature
Asfatine is more reactive than iodine
Hydrogen astatide is a weak acid
Hydrogen astatide is thermally stable

Chemistry Mcqs For All Public Service Exams