Which one of the following is not contained in Portland cement ?
A
Ca3Al2O6
B
Ca3SiO5
C
Ca2SiO4
D
Ca3(PO4)2
Question 3Single Answer
What is the reson for white cement to be white ?
A
It does not contain carbon
B
It does not contain silicon
C
It does not contain iron
D
It does not contain calcium
Question 4Single Answer
Which fertilizer is assimilated directly by the plant ?
A
Super phosphate
B
Nitrolim
C
Muriate of Potash
D
Humus
Question 5Single Answer
Which of the following chemicals is used in foam fire extinguishers ?
A
Aluminium sulphate
B
Copper sulphate
C
Cobalt sulphate
D
Nickel sulphate
Question 6Single Answer
What is a mixture of potassium nitrate, powdered charcoal and sulphur called ?
A
Glass
B
Cement
C
paint
D
Gun powder
Question 7Single Answer
Which one of the following chemicals is used in beauty parlours for hair – setting ?
A
Sulphur based
B
Phosphorus based
C
Silicon based
D
Iron based
Question 8Single Answer
Which one of the following is used as a mordant in dyeing and tanning industry ?
A
Magnesium oxide
B
Magnesium carbonate
C
Magnesium chloride
D
Magnesium sulphate
Question 9Single Answer
Which one of the following substances is used in the manufacture of safety matches ?
A
Red phosphorus
B
White phosphorus
C
Phosphorus trioxide (P2O3)
D
Black phosphorus
Question 10Single Answer
Which one of the following polymeric materials is used for making bullet proof jacket ?
A
Nylon –6, 6
B
Rayon
C
Kevlar
D
Dacron
Question 11Single Answer
Which one of the following is another name of RDX
A
Cyanohydrin
B
Dextran
C
Cyclohexane
D
Cyclonite
Question 12Single Answer
Which one of the following is used as an explosive ?
A
Phosphorus trichloride
B
Mercuric oxide
C
Graphite
D
Nitroglycerine
Question 13Single Answer
Flint glass is obtained from which of the following ?
A
Zinc and barium borosilicate
B
Sand, red lead and potassium carbonate
C
Sodium aluminium borosilicate
D
Pure silica and zinc oxide
Question 14Single Answer
Which one of the following correctly defines the state of glass ?
A
Crystalline solid
B
Super cooled liquid
C
Condensed gas
D
Liquid crystal
Question 15Single Answer
Which one of the following is not used as fertilizer ?
A
Ammonium nitrate
B
Ammonium sulphide
C
Ammonium phosphate
D
Ammonium sulphate
Question 16Single Answer
Which one of the following elements is needed in the human body to transfer electrical signals by nerve cells ?
A
Lithium
B
Sodium
C
Rubidium
D
Caesium
Question 17Single Answer
Which one of the following is NOT true for bleaching powder ?
A
It is used as a reducing agent in chemical industries
B
It is used for bleaching wood pup in paper factories
C
It is used for disinfecting drinking water
D
It is used for bleaching linen in textile industry
Question 18Single Answer
Hard glass having the same ingredientsas soft glass excepts.
A
hard glass have Na in place of K
B
hard glass having K in place of Na
C
hard glass having both Na and K
D
None of the above
Question 19Single Answer
A complete fertilizer provides
A
N,P, K
B
S, K, N
C
S, B, K
D
N, S, P
Question 20Single Answer
Antacids are commonly used to get rid of acidity in the Stomach. A commonly used antacid is.
A
sodium hydrogen phthalate
B
magnesium hydroxide
C
calcium hydroxide
D
manganese acetate
Question 21Single Answer
Annealing of glass is done to.
A
make it brittle
B
make it opaque
C
make it transparent
D
None of the above
Question 22Single Answer
Petrochemicals are obtained from.
A
coal
B
petroleum
C
coal tar
D
All of these
Question 23Single Answer
The use of chemicals for treatment of diseases is called as.
A
isothermotherapy
B
angiotherapy
C
physiotherapy
D
chemotherapy
Question 24Single Answer
Which of the following is a hypnotic drug ?
A
luminal
B
salol
C
catechol
D
chemisol
Question 25Single Answer
Teflon is a polymer of which of the following monomers ?
A
Tetrafluoroethylene
B
Vinyl chloride
C
Acetylene dichloride
D
None of the above/More than one of the above
Question 26Single Answer
LPG used as domestic fuel chiefly contains–
A
Methane
B
Propane
C
Ethylene
D
Butane
E
None of the above/More than one of the above
Question 27Single Answer
Glass is a.
A
liquid
B
colloid
C
non–crystalline amorphous solid
D
crystalline solid
Question 28Single Answer
Which one of the following acids is used for etching glass ?
A
H2SO4
B
HNO3
C
HF
D
HCI
Question 29Single Answer
What is the purpose of adding plasticizers in paint manufacturing process ?
A
They act as a film–forming constituent
B
They reduce the viscosity
C
They prevent the polymerization and condensation
D
They provide elasticity to the film and minimize its cracking
Question 30Single Answer
Which raw material is used in the preperation of soft glass ?
A
K2CO3, SiO2, CaCO3
B
K2CO3, SiO2, PbCO3
C
Na2CO3, SiO2, CaCO3
D
Na2CO3, SiO2, PbO
Question 31Single Answer
What is the composition of nitrolim – a chemical fertilizer ?
A
Nitrogen and limestone
B
Calcium carbide and nitrogen
C
Calcium carbide and carbon
D
None of above
Question 32Single Answer
the major component used in preparation of different type of glasses is.
A
Silica
B
Sodium borate
C
Calcium silicate
D
Sodium silicate
Question 33Single Answer
Salts of which of the following elements provide colours to fireworks ?
A
Zinc and sulphur
B
Potassium and mercury
C
Strontium and barium
D
Chromium and nickel
Question 34Single Answer
Given below are two statements :
Statement I : Phenyl is used as a household germicide.
Statement II : Phenyl is phenol derivative and phenol is an effective germicide.
In the light of the above statement, choose the correct answer from the options given below:
A
Both Statement I and II are correct and Statement II is the correct explanation of Statement I
B
Both Statement I and Statement II are true but Statement II is NOT the correct explanation of Statement I
C
Statement I is correct, but Statement II is incorrect
D
Statement I is incorrect, but Statement II is correct
Question 35Single Answer
Given below are two statements :
Statement I : Coal–based thermal power stations contribute to acid–rain.
Statement II : Oxides of carbon are emitted when coal burns.
In the light of the above statement, choose the correct answer from the options given below:
A
Both Statement I and II are individually correct and Statement II is the correct explanation of Statement I
B
Both Statement I and Statement II are individiaully correct but Statement II is not the correct explanation of Statement I
C
Statement I is correct, but Statement II is incorrect
D
Statement I is incorrect, but Statement II is correct
Question 36Single Answer
Terfenadine is commonly used as a/an.
A
transquilizer
B
antihistamine
C
antimicrobial
D
antibiotic
Question 37Single Answer
Which one of the following is not a tranqualizer ?
A
Equanil
B
Veronal
C
Salvarsan
D
Serotonin
Question 38Single Answer
Barbituric acid and its derivatives are well known.
A
antipyretics
B
analgesics
C
antiseptics
D
tranquilizers
Question 39Single Answer
Which one among is not an analgesic ?
A
Ibuprofen
B
Naproxen
C
Aspirin
D
Valium
Question 40Single Answer
Various phenol derivatives, tincture of iodine (2 – 3%) I 2 in (water/alcohol) and some dyes like methylene blue are.
A
antiseptics
B
disinfectants
C
analgesics
D
antipyretics
Question 41Single Answer
Commonly used antiseptics 'Dettol' is a mixture of.
A
o–chlorophenozylenol + terpeneol
B
o–cresol + terpeneol
C
phenol + terpeneol
D
chloroxylenol + terpeneol
Question 42Single Answer
Which of the following is not an antiseptic drug ?
A
Iodoform
B
Dettol
C
Gammexene
D
Genatian violet
Question 43Single Answer
Which one of the following substances is made from natural raw materials ?
A
Rayon
B
Nylon
C
Polyster
D
Polystyrene
Question 44Single Answer
The polymeric fibre used as a substitute for wool in making synthetic blankets, sweaters, etc. is.
A
nylon
B
teflon
C
orlon
D
bakelite
Question 45Single Answer
The cleaning of dirty clothes by soaps and detergents is deue to a type of molecules called surfactants, which are present in soaps and detergents. The surfactant molecules remove the dirt by.
A
making the cloth slippery
B
producing some gases between the dirt and the cloth
C
dissolving the dirt
D
forming some aggregates of themselves and take away the dirt in the core of the aggregates
Question 46Single Answer
Contact lenses are made from.
A
polyvinyl chloride
B
polystyrene
C
lucite
D
teflon
Question 47Single Answer
On of the occupational health hazards commonly faced by workers of ceramics, pottery and glass industry is.
A
stone formation in gall bladder
B
melanoma
C
silicosis
D
stone formation in kidney
Question 48Single Answer
vermicompost is an/a.
A
inorganic fertilizer
B
toxic substance
C
organic bio fertilizer
D
synthetic fertilizer
Question 49Single Answer
The macro nutrients provided by inorganic fertilizer are.
A
carbon, iron and boron
B
magnesium, manganese and sulphur
C
magnesiu, zinc and iron
D
nitrogen, phosphorus and potassium
Question 50Single Answer
Which one of the following statement is not correct ?
A
Water starts boiling when its vapour pressure becomes equal to amospheric pressure
B
Water is known as universal solvent
C
Permanent hardness of water is due to presence of MgCl2, CaCl2, MgSO4 and CaSO4
D
Density of ice is greater than that of water
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Chemistry
Question 51Single Answer
Density of the following polymers is used for making bullet proof windows ?
A
Polycarbonates
B
Polyerethanes
C
Polystyrene
D
Polyamides
Question 52Single Answer
Match the List – I with List – II
List - I List - II
(Substances) (Applications)
A. Aspartame 1. Syunthetic rubber
B. Freon 2. Anti – histamine
C. Neoprene 3. Artificial Sweetener
D. Benadryl 4. Refrigerant
Select correct answer using the codes given below :
A
A B C D
1 3 4 2
B
2 4 1 3
C
3 4 1 2
D
3 1 2 4
Question 53Single Answer
Match the List – I with List – II
List - I List - II
(Noble gas) (Use)
A. Argon 1. In lights for advertising display
B. Neon 2. Airport landing lights and in light houses
C. Krypton 3. Light in photographer's flash gun
D. Xenon 4. In tungsten filament to last longer
Select correct answer using the codes given below :
A
A B C D
3 1 2 4
B
3 2 1 4
C
4 2 1 3
D
4 1 2 3
Question 54Single Answer
Which one is a sublime substance ?
A
Table salt
B
Sugar
C
Iodine
D
Potassium Iodide
Question 55Single Answer
The process of change of liquied state into gaseous state at constant temperature is known as.
A
boiling
B
melting
C
fusion
D
evaporation
Question 56Single Answer
Which one is a surface phenomenon ?
A
Evaporation
B
Boiling
C
Both (a) and (b)
D
None of these
Question 57Single Answer
Jayamkondam in Tamil Nadu is famous for which among the following minerals ?
A
Bauxite
B
Lignite
C
Calcite
D
Magnesite
Question 58Single Answer
Which of the following processes is known as fusion ?
A
change of liquid to solid
B
Change of solid to liquid
C
Change of liquid to vapour
D
Change of gaseous state to solid state
Question 59Single Answer
The one, in which interparticle forces are strongest, is.
A
sodium chloride
B
hydrogen
C
ether
D
carbon dioxide
Question 60Single Answer
Which of the following is compound ?
A
Stainless steel
B
Brass
C
Iron sulphide
D
Diamond
Question 61Single Answer
Which one of the following is non-crystalline or amorphous ?
A
Diamond
B
Graphite
C
Glass
D
Common Salt
Question 62Single Answer
The size of colloidal particles usually lies in the range.
A
10–5 – 10–7 cm
B
10–7 – 10–9 cm
C
10–3 – 10–5 cm
D
10–5 – 10–6 cm
Question 63Single Answer
Oil and water can form a stable dispersion with the help of a third substance commonly called.
A
emulsifier
B
dispersant
C
protective colloid
D
None of these
Question 64Single Answer
Why is helium preferred over hydrogen for use in airships.
A
Helium has a low density
B
Helium has a high density
C
Helium is chemically less reactive
D
Helium is chemically more reactive
Question 65Single Answer
Which one of the following mixture is homogeneous ?
A
Starch and sugar
B
Methanol and water
C
Graphite and charcoal
D
Calcium carbonate and calcium bicarbonate
Question 66Single Answer
A mixture of sulphur and carbon disulphide is.
A
heterogeneous and shows Tyndall effect
B
homogeneous and shows Tyndall effect
C
heterogeneous and does not show Tyndall effect
D
homogeneous and does not show Tyndall effect
Question 67Single Answer
A student, carefully observed the colloidal of starch in water, human blood and cow milk. On the basis of observations, he made certain conclusions given below. Choose the wrong conclusion about colloidal solution.
A
Translucent
B
Components can be separated by ordinary filteration
C
Heterogenous and stable
D
show tyndal effect
Question 68Single Answer
Choose the incorrect statement about true solution.
A
Its components can not be separated by filteration
B
It is opaque and unstable
C
Its particles can not be seen through naked eye
D
It does not show tyndal effect
Question 69Single Answer
Barium sulphate (BaSO4) dispersed in water used diagnostic X–rays is a.
A
Colloid
B
Solution
C
Suspension
D
Foam
Question 70Single Answer
Non–reacting gases have a tendency to mix with each other. This phenomenon is known as.
A
chemical reaction
B
diffusion
C
effusion
D
explosion
Question 71Single Answer
Alkali halids do not show Frenkel defect because
A
cations and anions have almost equal size
B
there is a large difference in size of cations and anions
C
cations and anions have low coordination number
D
anions cannot be accommodated in voids
Question 72Single Answer
In NaCl structure
A
all octahedral and tetrahedral sites are occupied
B
only octahedral sites are occupied
C
only tetrahedral sites are occupied
D
neither octahedral nor tetrahedral sites are occupied
Question 73Single Answer
A mixture of ZnCl2 and PbCl2 can be separated by.
A
distillation
B
crystallization
C
sublimation
D
adding acetic acid
Question 74Single Answer
Magnetism is most beneficial for separating.
A
gases and non–metallic liquids
B
magnetic solids and solids such as sulphur
C
non–metallic solids and solids such as sulphur
D
non–magnetic solids from non–magnetic liquids
Question 75Single Answer
Water is boiling is open fry pan represents which type of change ?
A
Physical and irreversible
B
Chemical and irreversible
C
Physical and reversible
D
Chemical and reversible
Question 76Single Answer
Chemical change is always accompanied by
(1) production of sound
(2) heat and light
(3) change in mass
(4) change in colour
A
1, 2 & 3
B
2 & 4
C
1 only
D
1, 2 & 4
Question 77Single Answer
Who among the following is called 'The father of modern chemistry" ?
A
Michael Faraday
B
Lavoisier
C
Proust
D
Linus Pauling
Question 78Single Answer
Which one among the following is not a mixture ?
A
Graphite
B
Glass
C
Brass
D
Steel
Question 79Single Answer
The latest discovered state of matter is.
A
Solid
B
Bose–Einstein condensation
C
Plasma
D
liquid
Question 80Single Answer
Which one of the following is not a mixture ?
A
Toothpaste
B
Toilet soap
C
Baking soda
D
Vinegar
Question 81Single Answer
Which one of the following is a heterogenous mixure ?
A
Hydrochloric acid
B
Vinegar
C
Milk
D
Soda water
Question 82Single Answer
Which one of the following is not a characteristic of a compound ?
A
Composition is variable
B
All particles of compounder are of only one type
C
Particle of compound have two or more elements
D
Its constituents cannot be separated by simple physical methods
Question 83Single Answer
The gas is commonly used in anaesthesia.
A
methane
B
nitrous oxide
C
nitrogen
D
hydrogen peroxide
Question 84Single Answer
The inert gas abundantly found in atmosphere is.
A
Xe
B
Kr
C
He
D
Ar
Question 85Single Answer
Which gas is used in filling electric bulbs ?
A
Neon
B
Argon
C
Radon
D
Krypton
Question 86Single Answer
Kerosoene is a mixture of.
A
aromatic hydrocarbons
B
aliphatic hydrocarbons
C
saturated hydrocarbons
D
alicyclic hydrocarbons
Question 87Single Answer
Candle contains a mixture of.
A
Bees wax and paraffin wax
B
Bees wax and stearic acid
C
Paraffin wax and stearic acid
D
Higher fatty acid
Question 88Single Answer
Which one of the following noble gases is not found in the atmosphere ?
A
Argon
B
krypton
C
Radon
D
Xenon
Question 89Single Answer
Which gas is responsible for the swelling of bread ?
A
oxygen
B
Carbon monoxide
C
Carbon dioxide
D
Ammonia
Question 90Single Answer
Which of the following is used as a preservative to protect processed food ?
A
Sodium sulphate
B
Saccharin
C
BHT
D
Sodium metabisulphite
Question 91Single Answer
Carborundum is a compound of.
A
Ca
B
Ge
C
Si
D
S
Question 92Single Answer
Which of the following could act as a propellant for rockets ?
A
Liquid oxygen + Liquid argon
B
Liquid hydrogen + Liquid oxygen
C
Liquid nitrogen + Liquid oxygen
D
Liquid hydrogen + Liquid nitrogen
Question 93Single Answer
Helium is preferred to hydrogen in air ballons because it.
A
is cheaper
B
is less dense
C
has greater lifting power
D
does not form an explosive mixture with air
Question 94Single Answer
The compound that has the least value for octane number is-
A
n–heptane
B
2–methyl heptane
C
Iso–octane
D
2, 2 – dimethyl hexane
Question 95Single Answer
Select the one that is not a matter.
A
feeling of hot
B
smoke
C
humidity
D
water
Question 96Single Answer
Which is incorrect statement ?
A
Matter is continuous in nature
B
Of the three state of matter, the one that is most compact is solid state
C
In solid state interparticles space (i.e. empty space) is minimum
D
The density of solid is generally more than that of a liquid
Question 97Single Answer
Select the one that when used would be considered as best condition for liquification of a gas.
A
Increasing the temperature
B
Decreasing the pressure
C
Increasing the pressure and decreasing the temperature
D
Decreasing the pressure and increasing the temperature
Question 98Single Answer
Select the correct order of evaporation for water, alcohol, petrol and kerosene oil:
A
water > alcohol > kerosene oil > petrol
B
alcohol > petrol > water > kerosene oil
C
petrol > alcohol > water . kerosene oil
D
petrol > alcohol > kerosene oil > water
Question 99Single Answer
The evaporation of a liquid can best be carried out in a.
A
flask
B
china dish
C
test–tube
D
beaker
Question 100Single Answer
The melting point temperature of the solid state of a substance is 40° C. The freezing point temperature of the liquid state of the same substance will be.
A
35°C
B
40°C
C
45°C
D
can't predict
Question 101Single Answer
Which one will help to accelerate the process of evaporation of a liquid kept in an open china dish ?
A
Keeping dish in open
B
Blowing air into the liquid
C
Keeping the dish under a running fan
D
All of the above
Question 102Single Answer
When a gas is compressed keeeping temperature constant, it result in.
A
increase in speed of gaseous molecules
B
increase in collision among gaseous molecules
C
ecrease in speed of gaseous molecules
D
decrease in collision among gaseous molecules
Question 103Single Answer
Which of the following in an element ?
A
Marble
B
Graphite
C
Washing stone
D
Stone
Question 104Single Answer
An atom is.
A
The smallest particle of matter known
B
The smallest particle of a gas
C
The smallest indivisible particle of an element that can tak part in a chemical change
D
Radioactive emission
Question 105Single Answer
Which of the following is a compound ?
A
Stainless steel
B
Brass
C
Iron sulphide
D
Diamond
Question 106Single Answer
Select the one that has a definite boiling point.
A
true solution
B
compound
C
colloid
D
All of these
Question 107Single Answer
we can see the particles of a collidal solution with.
A
naked eyes
B
the help of ultramicroscope
C
the help of microscope
D
None of these
Question 108Single Answer
Which of the following will yield a mixture ?
A
Crushing of marble tile
B
Breaking of ice–cubes
C
Addition of sodium metal to water in a china dish
D
Agitating a detergent with water in a washing machine
Question 109Single Answer
On passing through a colloidal solution, the beam of light gets..............
A
reflected
B
refracted
C
scattered
D
absorbed
Question 110Single Answer
How many chloride ions are surrounding sodium ion in sodium chloride crystal ?
A
4
B
8
C
6
D
12
Question 111Single Answer
Brass is an example of.
A
compound
B
element
C
homogeneous mixture
D
heterogeneous mixture
Question 112Single Answer
Air is regarded as mixture because.
A
its pressure may vary
B
its temperature may vary
C
its volume changes with change in temperature pressure
D
its composition may vary
Question 113Single Answer
The size of colloidal particles usually lies in the range.
A
10–5 – 10–7 cm
B
10–7 – 10–9 cm
C
10–3 – 10–5 cm
D
10–2 – 10–6 cm
Question 114Single Answer
Oil and water can form a stable dispersion with help of a third substance commonly called.
A
emulsifier
B
dispersant
C
protective colloid
D
None of these
Question 115Single Answer
The blue colour of water in the sea is due to.
A
absorption of other colour except blue by water molecules
B
scattering of blue light by sol particles
C
refraction of blue light by impurities present in seawater
D
reflection of blue sky by sea water
Question 116Single Answer
Tails of comets are visible due to.
A
Tyndall Effect
B
Reflection
C
Brownian movement
D
None of these
Question 117Single Answer
Why is helium preferred over hydrogen for use in airships ?
A
Helium has a low density
B
Helium has a high density
C
Helium is chemically less reactive
D
Helium is chemically more reactive
Question 118Single Answer
Which one of the following mixtures is homogeneous ?
A
Starch and sugar
B
Methanol and water
C
Graphite and charcoal
D
Calcium carbonate and calcium bicarbonate
Question 119Single Answer
During summer, wate kept in an earthen pot becomes cool because of the phenomenon of.
A
diffusion
B
transpiration
C
osmosis
D
evaporation
Question 120Single Answer
A few substance are arranged in the increasing order of 'force of attraction' between their particle, Which one of the following represents a correct arrangement ?
A
Water, air, wind
B
Air, sugar, oil
C
Oxygen, water, sugar
D
salt, juice, air
Question 121Single Answer
The boiling points of diethyl ether, acetone and n–butyl alcohol are 35°C, 56°C, and 118°C respectively. Which one of the following correctly represents their boiling points in kelvin scale ?
A
306K, 326K, 391K
B
308K, 329K, 392 K
C
308K, 329K, 391K
D
329K, 392K, 308K
Question 122Single Answer
In Which of the following conditions, the distance between the molecules of hydrogen gas would increase ?
(1) Increasing pressure on hydrogen contained in a closed container
(2) Some hydrogen gas leaking out of the container
(3) Increasing the volume of the container of hydrogen gas
(4) Adding more hydrogen gas to the container without increasing the volume of the container
A
1 and 3
B
1 and 4
C
2 and 3
D
2 and 4
Question 123Single Answer
Which of the following statements are true for pure substances ?
(1) Pure substances contain only one kind of particles
(2) Pure substances may be compounds of mixtures
(3) Pure substances have the same composition throughout
(4) Pure substances can be exemplified by all elements other than nickel
A
1 and 2
B
2 and 3
C
3 and 4
D
2 and 3
Question 124Single Answer
Tincture of iodine has antiseptic properties. This solution is made by dissolving.
A
iodine in potassium iodide
B
iodine in vaseline
C
iodine in water
D
iodine in alcohol
Question 125Single Answer
There are four test tubes A,B, C and D half filled with water. A considerable quantity of sugar, milk, egg white and common salt was added in them respectively with stirring the contents of each tube.
True solution will be obtained in
A
Only A
B
Only D
C
Both B and C
D
Both A and D
Question 126Single Answer
The example of solution of liquid in gas is.
A
Dry air
B
Sugar in water
C
mercury in gold
D
Moist air
Question 127Single Answer
The component of a solution which is present in larger amount is referred to as.
A
Solute
B
Solvent
C
Both (a) and (b)
D
Neither (a) nor (b)
Question 128Single Answer
You have prepared four different mixtures in water using
1. Charcoal powder, 2. Chalk powder, 3. Slaked lime and 4. Detergent powder. If you filter these mixtures through a filter paper, there will be no residue left after filtration in the case of.
A
Charcoal powder
B
chalk powder
C
slaked lime
D
detergent powder
Question 129Single Answer
A gas can be compressed to a fraction of its volume. The same volume of a gas can be spread all over a room. The reason for this is that.
A
the volume occupied by molecules of a gas is negligible as compared to the total volume of the gas
B
gases consists of molecules which are in a state of random motion
C
gases consist of molecules having very large intermolecular space which can be reduced or increased under ordinary conditions
D
None of these
Question 130Single Answer
Which has the least energetic molecules ?
A
Solids
B
Liquids
C
Gases
D
Plasmas
Question 131Single Answer
The process used to separate oil and water is.
A
distillation
B
sublimation
C
separating funnel
D
chromatography
Question 132Single Answer
A mixture of common salt, sulphur, sand and iron filings is shaken with carbon disulphide and filtered through a filter paper. The filtrate is evaporated to dryness in a china dish. What will be left in dish after evaporation ?
A
Sand
B
Sulphur
C
Iron filings
D
Common salt
Question 133Single Answer
White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both identical in appearence and have a uniform composition throughout. What can be said about the samples ?
A
They are homogeneous mixtures and be classified as metallic alloys
B
The materials are heterogeneous mixtures and can be classified by their components
C
The samples have variable compositions and are classified as metallic solution
D
The samples are heterogeneous mixtures that can be separated using magnetic properties
Question 134Single Answer
Which flow chart correctly describe a homogeneous materials ?
A
Unknown – density – 3 layers
B
Unknown – filtration – two substances
C
Unknown – magnet – two substances
D
Unknown – boiling – one temperature
Question 135Single Answer
Magnetism is most beneficial for separating.
A
gases and non – metalic liquids
B
magnetic solids and solids such as sulphur
C
non–metallic solids and solids such as sulphur
D
non–magnetic solids from non–magnetic liquids
Question 136Single Answer
Distillation is a good separation technique for.
A
solids
B
liquids
C
solid alloys
D
gases
Question 137Single Answer
Solubility is a good separation technique for.
A
solids
B
liquids
C
solid alloys
D
gases
Question 138Single Answer
40g of common salt is dissolved in 320 g of water. The mass percentage of salt is.
A
11.1%
B
12.5%
C
15%
D
10%
Question 139Single Answer
Water is boiling in open fry pan represents which type of change ?
A
Physical and irreversible
B
Chemical and irreversible
C
Physical and reversible
D
Chemical and reversible
Question 140Single Answer
Which of the following is a chemical change ?
A
Dent produced on car body by cricket ball
B
Streching of rubber band
C
Brinjals and apples becomes dark on exposure to atmosphere
D
Formation of salts by collecting sea water in shallows pits
Question 141Single Answer
The cause of Brownian movement is.
A
convection current
B
heat changes in liquid state
C
impact of molecules of dispersion medium on colloidal particles
D
attractive forces between particles of dispersed phase and dispersion medium
Question 142Single Answer
Which one among the following statements regarding the properties of mixtures and compounds is not correct ?
A
A mixture shows the properties of its constituents but the properties of a compound are entirely different from its constituents
B
A mixture may be homogeneous or heterogeneous but a compound is a homogeneous substance
C
The constitudents of amixture can be separated by physical methods but those of a compound cannot be separated by physical methods
D
Energy is either absorbed or evolved during the preparation of a mixture but not in the preparation of a compound
Question 143Single Answer
What is the term used to denote the criical temperature at which the air becomes saturated with vapour and below which the condensation is likely to begin ?
A
Condensation point
B
Evaporation point
C
Dew point
D
Point of critical temperature
Question 144Single Answer
Barrium in a suitable form is administered to patients before an X–ray examination of the stomach, because.
A
barium allows X–rays to pass through the stomach on account of its transparency to X–rays
B
barium is a good absorber of g–rays and this helps the stomach to appear clearly in contrast with the other regions in the picture
C
barium is a good absorber of X–rays and this helps the stomach to appear clearly conrast with the other regions in the picture
D
barium salts are white in colour and this helps the stomach to appear clearly in contrast with other regions in the pictures
Question 145Single Answer
Which one among the following statements about an atoms is not correct ?
A
Atoms always combine to form molecules
B
Atoms are the basic units from which molecules and ions are formed
C
Atoms are always neutral in nature
D
Atoms aggregate in large numbers to form the matter that we can see, feel and touch
Question 146Single Answer
Which of the following pair is/are correctly matched ?
1. Iosotopes : Atoms with same atomic number but different atomic mass
2. Isobars : Atoms with same number of neutrons but different atomic number
3. Isotones : Atoms with same mass number but different atomic number
Select the correct answer using the code given below: codes:
A
1, 2 and 3
B
1 only
C
1 and 2 only
D
2 only
Question 147Single Answer
An oxide of nitrogen has molecular weight 30. What is the number of electrons in one molecule of the compound ?
A
14
B
15
C
22
D
23
Question 148Single Answer
What is the weight of one atom of Hydrogen in grams ?
A
6.023 × 10–23
B
1.66 × 10–24
C
6.62 × 10–24
D
None of these
Question 149Single Answer
Which among the following is popularly called Hypo ?
