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Question Bank

JSSC PGT Teacher (Chemistry) Exam - English

Duration: 180 · Questions: 150 · Max Marks: 300 · Language: 1

View JSSC PGT Teacher Chemistry 2026 Exam Page

Chemistry

1
Which of the following is not a synthetic fibre:
  1. A.Anygora
  2. B.Rayon
  3. C.Nylon
  4. D.Polyster
2
Which one of the following is not contained in Portland cement ?
  1. A.Ca3Al2O6
  2. B.Ca3SiO5
  3. C.Ca2Si­O4
  4. D.Ca3(PO4)2
3
What is the reson for white cement to be white ?
  1. A.It does not contain carbon
  2. B.It does not contain silicon
  3. C.It does not contain iron
  4. D.It does not contain calcium
4
Which fertilizer is assimilated directly by the plant ?
  1. A.Super phosphate
  2. B.Nitrolim
  3. C.Muriate of Potash
  4. D.Humus
5
Which of the following chemicals is used in foam fire extinguishers ?
  1. A.Aluminium sulphate
  2. B.Copper sulphate
  3. C.Cobalt sulphate
  4. D.Nickel sulphate 
6
What is a mixture of potassium nitrate, powdered charcoal and sulphur called ?
  1. A.Glass
  2. B.Cement
  3. C.paint
  4. D.Gun powder
7
Which one of the following chemicals is used in beauty parlours for hair – setting ?
  1. A.Sulphur based
  2. B.Phosphorus based
  3. C.Silicon based
  4. D.Iron based 
8
Which one of the following is used as a mordant in dyeing and tanning industry ?
  1. A.Magnesium oxide
  2. B.Magnesium carbonate
  3. C.Magnesium chloride
  4. D.Magnesium sulphate
9
Which one of the following substances is used in the manufacture of safety matches ?
  1. A.Red phosphorus
  2. B.White phosphorus
  3. C.Phosphorus trioxide (P2O3)
  4. D.Black phosphorus
10
Which one of the following polymeric materials is used for making bullet proof jacket ?
  1. A.Nylon –6, 6
  2. B.Rayon
  3. C.Kevlar
  4. D.Dacron
11
Which one of the following is another name of RDX
  1. A.Cyanohydrin
  2. B.Dextran
  3. C.Cyclohexane
  4. D.Cyclonite
12
Which one of the following is used as an explosive ?
  1. A.Phosphorus trichloride
  2. B.Mercuric oxide
  3. C.Graphite
  4. D.Nitroglycerine
13
Flint glass is obtained from which of the following ?
  1. A.Zinc and barium borosilicate
  2. B.Sand, red lead and potassium carbonate
  3. C.Sodium aluminium borosilicate
  4. D.Pure silica and zinc oxide
14
Which one of the following correctly defines the state of glass ?
  1. A.Crystalline solid
  2. B.Super cooled liquid
  3. C.Condensed gas
  4. D.Liquid crystal
15
Which one of the following is not used as fertilizer ?
  1. A.Ammonium nitrate
  2. B.Ammonium sulphide
  3. C.Ammonium phosphate
  4. D.Ammonium sulphate   
16
Which one of the following elements is needed in the human body to transfer electrical signals by nerve cells ?
  1. A.Lithium
  2. B.Sodium
  3. C.Rubidium
  4. D.Caesium
17
Which one of the following is NOT true for bleaching powder ?
  1. A.It is used as a reducing agent in chemical industries
  2. B.It is used for bleaching wood pup in paper factories
  3. C.It is used for disinfecting drinking water
  4. D.It is used for bleaching linen in textile industry
18
Hard glass having the same ingredientsas soft glass excepts.
  1. A.hard glass have Na in place of K
  2. B.hard glass having K in place of Na
  3. C.hard glass having both Na and K
  4. D.None of the above
19
A complete fertilizer provides
  1. A.N,P, K
  2. B.S, K, N
  3. C.S, B, K
  4. D.N, S, P
20
Antacids are commonly used to get rid of acidity in the Stomach. A commonly used antacid is.
  1. A.sodium hydrogen phthalate
  2. B.magnesium hydroxide  
  3. C.calcium hydroxide
  4. D.manganese acetate
21
Annealing of glass is done to.
  1. A.make it brittle
  2. B.make it opaque
  3. C.make it transparent
  4. D.None of the above
22
Petrochemicals are obtained from.
  1. A.coal
  2. B.petroleum
  3. C.coal tar
  4. D.All of these
23
The use of chemicals for treatment of diseases is called as.
  1. A.isothermotherapy
  2. B.angiotherapy
  3. C.physiotherapy
  4. D.chemotherapy
24
Which of the following is a hypnotic drug ?
  1. A.luminal
  2. B.salol
  3. C.catechol
  4. D.chemisol
25
Teflon is a polymer of which of the following monomers ?
  1. A.Tetrafluoroethylene
  2. B.Vinyl chloride
  3. C.Acetylene dichloride  
  4. D.None of the above/More than one of the above
26
LPG used as domestic fuel chiefly contains–
  1. A.Methane
  2. B.Propane
  3. C.Ethylene
  4. D.Butane
  5. E.None of the above/More than one of the above     
27
Glass is a.
  1. A.liquid
  2. B.colloid
  3. C.non–crystalline amorphous solid
  4. D.crystalline solid
28
Which one of the following acids is used for etching glass ?
  1. A.H2SO4
  2. B.HNO3
  3. C.HF
  4. D.HCI
29
What is the purpose of adding plasticizers in paint manufacturing process ?
  1. A.They act as a film–forming constituent
  2. B.They reduce the viscosity
  3. C.They prevent the polymerization and condensation
  4. D.They provide elasticity to the film and minimize its cracking
30
Which raw material is used in the preperation of soft glass ?
  1. A.K2CO3, SiO2, CaCO3
  2. B.K2CO3, SiO2, PbCO3
  3. C.Na2CO3, SiO2, CaCO3
  4. D.Na2CO3, SiO2, PbO
31
What is the composition of nitrolim – a chemical fertilizer ?
  1. A.Nitrogen and limestone
  2. B.Calcium carbide and nitrogen
  3. C.Calcium carbide and carbon
  4. D.None of above
32
the major component used in preparation of different type of glasses is.
  1. A.Silica
  2. B.Sodium borate
  3. C.Calcium silicate
  4. D.Sodium silicate
33
Salts of which of the following elements provide colours to fireworks ?
  1. A.Zinc and sulphur
  2. B.Potassium and mercury
  3. C.Strontium and barium
  4. D.Chromium and nickel
34
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:
  1. A.Both Statement I and II are correct and Statement II is the correct explanation of Statement I
  2. B.Both Statement I and Statement II are true but Statement II is NOT the correct explanation of Statement I
  3. C.Statement I is correct, but Statement II is incorrect
  4. D.Statement I is incorrect, but Statement II is correct
35
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:
  1. A.Both Statement I and II are individually correct and Statement II is the correct explanation of Statement I
  2. B.Both Statement I and Statement II are individiaully correct but Statement II is not the correct explanation of Statement I
  3. C.Statement I is correct, but Statement II is incorrect
  4. D.Statement I is incorrect, but Statement II is correct
36
Terfenadine is commonly used as a/an.
  1. A.transquilizer
  2. B.antihistamine
  3. C.antimicrobial
  4. D.antibiotic
37
Which one of the following is not a tranqualizer ?
  1. A.Equanil
  2. B.Veronal
  3. C.Salvarsan
  4. D.Serotonin
38
Barbituric acid and its derivatives are well known.
  1. A.antipyretics    
  2. B.analgesics
  3. C.antiseptics  
  4. D.tranquilizers 
39
Which one among is not an analgesic ?
  1. A.Ibuprofen
  2. B.Naproxen
  3. C.Aspirin
  4. D.Valium
40
Various phenol derivatives, tincture of iodine (2 – 3%) I 2 in (water/alcohol) and some dyes like methylene blue are.
  1. A.antiseptics
  2. B.disinfectants
  3. C.analgesics
  4. D.antipyretics
41
Commonly used antiseptics 'Dettol' is a mixture of.
  1. A.o–chlorophenozylenol + terpeneol
  2. B.o–cresol + terpeneol
  3. C.phenol + terpeneol
  4. D.chloroxylenol + terpeneol
42
Which of the following is not an antiseptic drug ?
  1. A.Iodoform
  2. B.Dettol
  3. C.Gammexene
  4. D.Genatian violet
43
Which one of the following substances is made from natural raw materials ?
  1. A.Rayon
  2. B.Nylon
  3. C.Polyster
  4. D.Polystyrene
44
The polymeric fibre used as a substitute for wool in making synthetic blankets, sweaters, etc. is.
  1. A.nylon
  2. B.teflon
  3. C.orlon
  4. D.bakelite
45
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.
  1. A.making the cloth slippery
  2. B.producing some gases between the dirt and the cloth
  3. C.dissolving the dirt
  4. D.forming some aggregates of themselves and take away the dirt in the core of the aggregates
46
Contact lenses are made from.
  1. A.polyvinyl chloride
  2. B.polystyrene
  3. C.lucite
  4. D.teflon
47
On of the occupational health hazards commonly faced by workers of ceramics, pottery and glass industry is.
  1. A.stone formation in gall bladder
  2. B.melanoma
  3. C.silicosis
  4. D.stone formation in kidney
48
vermicompost is an/a.
  1. A.inorganic fertilizer
  2. B.toxic substance
  3. C.organic bio fertilizer
  4. D.synthetic fertilizer
49
The macro nutrients provided by inorganic fertilizer are.
  1. A.carbon, iron and boron
  2. B.magnesium, manganese and sulphur
  3. C.magnesiu, zinc and iron
  4. D.nitrogen, phosphorus and potassium
50
Which one of the following statement is not correct ?
  1. A.Water starts boiling when its vapour pressure becomes equal to amospheric pressure
  2. B.Water is known as universal solvent
  3. C.Permanent hardness of water is due to presence of MgCl­­2­, CaCl2, MgSO4 and CaSO4
  4. D.Density of ice is greater than that of water
51
Density of the following polymers is used for making bullet proof windows ?
  1. A.Polycarbonates
  2. B.Polyerethanes
  3. C.Polystyrene
  4. D.Polyamides
52
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 :
  1. A.A B C D
    1 3  4 2
  2. B.2 4 1 3
  3. C.3 4 1 2
  4. D.3 1 2 4
53
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 :
  1. A.A B C D
    3 1  2  4
  2. B.3 2 1 4
  3. C.4 2 1 3
  4. D.4 1 2 3
54
Which one is a sublime substance ?
  1. A.Table salt   
  2. B.Sugar
  3. C.Iodine
  4. D.Potassium Iodide
55
The process of change of liquied state into gaseous state at constant temperature is known as.
  1. A.boiling
  2. B.melting
  3. C.fusion
  4. D.evaporation
56
Which one is a surface phenomenon ?
  1. A.Evaporation
  2. B.Boiling
  3. C.Both (a) and (b)
  4. D.None of these  
57
Jayamkondam in Tamil Nadu is famous for which among the following minerals ?
  1. A.Bauxite
  2. B.Lignite
  3. C.Calcite
  4. D.Magnesite
58
Which of the following processes is known as fusion ?
  1. A.change of liquid to solid
  2. B.Change of solid to liquid
  3. C.Change of liquid to vapour
  4. D.Change of gaseous state to solid state
59
The one, in which interparticle forces are strongest, is.
  1. A.sodium chloride
  2. B.hydrogen
  3. C.ether
  4. D.carbon dioxide   
60
Which of the following is compound ?
  1. A.Stainless steel
  2. B.Brass
  3. C.Iron sulphide
  4. D.Diamond
61
Which one of the following is non-crystalline or amorphous ?
  1. A.Diamond
  2. B.Graphite
  3. C.Glass
  4. D.Common Salt
62
The size of colloidal particles usually lies in the range.
  1. A.10–5 – 10–7 cm
  2. B.10–7 – 10–9 cm
  3. C.10–3 – 10–5 cm
  4. D.10–5 – 10–6 cm
63
Oil and water can form a stable dispersion with the help of a third substance commonly called.
  1. A.emulsifier
  2. B.dispersant
  3. C.protective colloid
  4. D.None of these
64
Why is helium preferred over hydrogen for use in airships.
  1. A.Helium has a low density
  2. B.Helium has a high density
  3. C.Helium is chemically less reactive
  4. D.Helium is chemically more reactive
65
Which one of the following mixture is homogeneous ?
  1. A.Starch and sugar
  2. B.Methanol and water
  3. C.Graphite and charcoal
  4. D.Calcium carbonate and calcium bicarbonate
66
A mixture of sulphur and carbon disulphide is.
  1. A.heterogeneous and shows Tyndall effect
  2. B.homogeneous and shows Tyndall effect
  3. C.heterogeneous and does not show Tyndall effect
  4. D.homogeneous and does not show Tyndall effect
67
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.
  1. A.Translucent
  2. B.Components can be separated by ordinary filteration
  3. C.Heterogenous and stable
  4. D.show tyndal effect
68
Choose the incorrect statement about true solution.
  1. A.Its components can not be separated by filteration
  2. B.It is opaque and unstable
  3. C.Its particles can not be seen through naked eye
  4. D.It does not show tyndal effect
69
Barium sulphate (BaSO4) dispersed in water used diagnostic X–rays is a.
  1. A.Colloid
  2. B.Solution
  3. C.Suspension
  4. D.Foam
70
Non–reacting gases have a tendency to mix with each other. This phenomenon is known as.
  1. A.chemical reaction
  2. B.diffusion
  3. C.effusion
  4. D.explosion
71
Alkali halids do not show Frenkel defect because
  1. A.cations and anions have almost equal size
  2. B.there is a large difference in size of cations and anions
  3. C.cations and anions have low coordination number
  4. D.anions cannot be accommodated in voids
72
In NaCl structure
  1. A.all octahedral and tetrahedral sites are occupied
  2. B.only octahedral sites are occupied
  3. C.only tetrahedral sites are occupied
  4. D.neither octahedral nor tetrahedral sites are occupied
73
A mixture of ZnCl2 and PbCl2 can be separated by.
  1. A.distillation
  2. B.crystallization
  3. C.sublimation
  4. D.adding acetic acid
74
Magnetism is most beneficial for separating.
  1. A.gases and non–metallic liquids
  2. B.magnetic solids and solids such as sulphur
  3. C.non–metallic solids and solids such as sulphur
  4. D.non–magnetic solids from non–magnetic liquids
75
Water is boiling is open fry pan represents which type of change ?
  1. A.Physical and irreversible
  2. B.Chemical and irreversible
  3. C.Physical and reversible
  4. D.Chemical and reversible
76
Chemical change is always accompanied by
(1) production of sound
(2) heat and light
(3) change in mass
(4) change in colour
  1. A.1, 2 & 3
  2. B.2 & 4
  3. C.1 only
  4. D.1, 2 & 4
77
Who among the following is called 'The father of modern chemistry" ?
  1. A.Michael Faraday
  2. B.Lavoisier
  3. C.Proust
  4. D.Linus Pauling
78
Which one among the following is not a mixture ?
  1. A.Graphite
  2. B.Glass
  3. C.Brass
  4. D.Steel
79
The latest discovered state of matter is.
  1. A.Solid
  2. B.Bose–Einstein condensation
  3. C.Plasma
  4. D.liquid 
80
Which one of the following is not a mixture ?
  1. A.Toothpaste
  2. B.Toilet soap
  3. C.Baking soda
  4. D.Vinegar
81
Which one of the following is a heterogenous mixure ?
  1. A.Hydrochloric acid
  2. B.Vinegar
  3. C.Milk
  4. D.Soda water
82
Which one of the following is not a characteristic of a compound ?
  1. A.Composition is variable
  2. B.All particles of compounder are of only one type
  3. C.Particle of compound have two or more elements
  4. D.Its constituents cannot be separated by simple physical methods
83
The gas is commonly used in anaesthesia.
  1. A.methane
  2. B.nitrous oxide
  3. C.nitrogen
  4. D.hydrogen peroxide
84
The inert gas abundantly found in atmosphere is.
  1. A.Xe
  2. B.Kr
  3. C.He
  4. D.Ar
85
Which gas is used in filling electric bulbs ?
  1. A.Neon
  2. B.Argon
  3. C.Radon
  4. D.Krypton
86
Kerosoene is a mixture of.
  1. A.aromatic hydrocarbons
  2. B.aliphatic hydrocarbons
  3. C.saturated hydrocarbons
  4. D.alicyclic hydrocarbons
87
Candle contains a mixture of.
  1. A.Bees wax and paraffin wax
  2. B.Bees wax and stearic acid
  3. C.Paraffin wax and stearic acid
  4. D.Higher fatty acid
88
Which one of the following noble gases is not found in the atmosphere ?
  1. A.Argon
  2. B.krypton
  3. C.Radon
  4. D.Xenon
89
Which gas is responsible for the swelling of bread ?
  1. A.oxygen
  2. B.Carbon monoxide
  3. C.Carbon dioxide
  4. D.Ammonia
90
Which of the following is used as a preservative to protect processed food ?
  1. A.Sodium sulphate
  2. B.Saccharin
  3. C.BHT
  4. D.Sodium metabisulphite
91
Carborundum is a compound of.
  1. A.Ca
  2. B.Ge
  3. C.Si
  4. D.S
92
Which of the following could act as a propellant for rockets ?
  1. A.Liquid oxygen + Liquid argon
  2. B.Liquid hydrogen + Liquid oxygen
  3. C.Liquid nitrogen + Liquid oxygen
  4. D.Liquid hydrogen + Liquid nitrogen
93
Helium is preferred to hydrogen in air ballons because it.
  1. A.is cheaper
  2. B.is less dense
  3. C.has greater lifting power
  4. D.does not form an explosive mixture with air
94
The compound that has the least value for octane number is-
  1. A.n–heptane
  2. B.2–methyl heptane
  3. C.Iso–octane
  4. D.2, 2 – dimethyl hexane
95
Select the one that is not a matter.
  1. A.feeling of hot
  2. B.smoke
  3. C.humidity
  4. D.water
96
Which is incorrect statement ?
  1. A.Matter is continuous in nature
  2. B.Of the three state of matter, the one that is most compact is solid state
  3. C.In solid state interparticles space (i.e. empty space) is minimum
  4. D.The density of solid is generally more than that of a liquid
97
Select the one that when used would be considered as best condition for liquification of a gas.
  1. A.Increasing the temperature
  2. B.Decreasing the pressure
  3. C.Increasing the pressure and decreasing the temperature
  4. D.Decreasing the pressure and increasing the temperature
98
Select the correct order of evaporation for water, alcohol, petrol and kerosene oil:
  1. A.water > alcohol > kerosene oil > petrol
  2. B.alcohol > petrol > water > kerosene oil
  3. C.petrol > alcohol > water . kerosene oil
  4. D.petrol > alcohol > kerosene oil > water
99
The evaporation of a liquid can best be carried out in a.
  1. A.flask
  2. B.china dish
  3. C.test–tube
  4. D.beaker
100
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.
  1. A.35°C
  2. B.40°C
  3. C.45°C
  4. D.can't predict
101
Which one will help to accelerate the process of evaporation of a liquid kept in an open china dish ?
  1. A.Keeping dish in open
  2. B.Blowing air into the liquid
  3. C.Keeping the dish under a running fan
  4. D.All of the above
102
When a gas is compressed keeeping temperature constant, it result in.
  1. A.increase in speed of gaseous molecules
  2. B.increase in collision among gaseous molecules
  3. C.ecrease in speed of gaseous molecules
  4. D.decrease in collision among gaseous molecules
103
Which of the following in an element ?
  1. A.Marble
  2. B.Graphite
  3. C.Washing stone
  4. D.Stone
104
An atom is.
  1. A.The smallest particle of matter known
  2. B.The smallest particle of a gas
  3. C.The smallest indivisible particle of an element that can tak part in a chemical change
  4. D.Radioactive emission
105
Which of the following is a compound ?
  1. A.Stainless steel
  2. B.Brass
  3. C.Iron sulphide
  4. D.Diamond
106
Select the one that has a definite boiling point.
  1. A.true solution
  2. B.compound
  3. C.colloid
  4. D.All of these 
107
we can see the particles of a collidal solution with.
  1. A.naked eyes
  2. B.the help of ultramicroscope
  3. C.the help of microscope
  4. D.None of these
108
Which of the following will yield a mixture ?
  1. A.Crushing of marble tile
  2. B.Breaking of ice–cubes
  3. C.Addition of sodium metal to water in a china dish
  4. D.Agitating a detergent with water in a washing machine
109
On passing through a colloidal solution, the beam of light gets..............
  1. A.reflected
  2. B.refracted
  3. C.scattered
  4. D.absorbed
110
How many chloride ions are surrounding sodium ion in sodium chloride crystal ?
  1. A.4
  2. B.8
  3. C.6
  4. D.12
111
Brass is an example of.
  1. A.compound
  2. B.element
  3. C.homogeneous mixture
  4. D.heterogeneous mixture
112
Air is regarded as mixture because.
  1. A.its pressure may vary
  2. B.its temperature may vary
  3. C.its volume changes with change in temperature pressure
  4. D.its composition may vary
113
The size of colloidal particles usually lies in the range.
  1. A.10–5 – 10–7 cm
  2. B.10–7 – 10–9 cm
  3. C.10–3 – 10–5 cm
  4. D.10–2 – 10–6 cm
114
Oil and water can form a stable dispersion with help of a third substance commonly called.
  1. A.emulsifier
  2. B.dispersant
  3. C.protective colloid
  4. D.None of these
115
The blue colour of water in the sea is due to.
  1. A.absorption of other colour except blue by water molecules
  2. B.scattering of blue light by sol particles
  3. C.refraction of blue light by impurities present in seawater
  4. D.reflection of blue sky by sea water
116
Tails of comets are visible due to.
  1. A.Tyndall Effect
  2. B.Reflection
  3. C.Brownian movement
  4. D.None of these    
117
Why is helium preferred over hydrogen for use in airships ?
  1. A.Helium has a low density
  2. B.Helium has a high density
  3. C.Helium is chemically less reactive
  4. D.Helium is chemically more reactive
118
Which one of the following mixtures is homogeneous ?
  1. A.Starch and sugar
  2. B.Methanol and water
  3. C.Graphite and charcoal
  4. D.Calcium carbonate and calcium bicarbonate
119
During summer, wate kept in an earthen pot becomes cool because of the phenomenon of.
  1. A.diffusion
  2. B.transpiration
  3. C.osmosis
  4. D.evaporation
120
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 ?
  1. A.Water, air, wind
  2. B.Air, sugar, oil
  3. C.Oxygen, water, sugar
  4. D.salt, juice, air
121
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 ?
  1. A.306K, 326K, 391K
  2. B.308K, 329K, 392 K
  3. C.308K, 329K, 391K
  4. D.329K, 392K, 308K
122
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
  1. A.1 and 3
  2. B.1 and 4
  3. C.2 and 3
  4. D.2 and 4
123
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
  1. A.1 and 2
  2. B.2 and 3
  3. C.3 and 4
  4. D.2 and 3
124
Tincture of iodine has antiseptic properties. This solution is made by dissolving.
  1. A.iodine in potassium iodide
  2. B.iodine in vaseline
  3. C.iodine in water
  4. D.iodine in alcohol
125
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
  1. A.Only A
  2. B.Only D
  3. C.Both B and C
  4. D.Both A and D
126
The example of solution of liquid in gas is.
  1. A.Dry air
  2. B.Sugar in water
  3. C.mercury in gold
  4. D.Moist air
127
The component of a solution which is present in larger amount is referred to as.
  1. A.Solute
  2. B.Solvent
  3. C.Both (a) and (b)
  4. D.Neither (a) nor (b)
128
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.
  1. A.Charcoal powder
  2. B.chalk powder
  3. C.slaked lime
  4. D.detergent powder
129
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.
  1. A.the volume occupied by molecules of a gas is negligible as compared to the total volume of the gas
  2. B.gases consists of molecules which are in a state of random motion
  3. C.gases consist of molecules having very large intermolecular space which can be reduced or increased under ordinary conditions
  4. D.None of these
130
Which has the least energetic molecules ?
  1. A.Solids
  2. B.Liquids
  3. C.Gases
  4. D.Plasmas
131
The process used to separate oil and water is.
  1. A.distillation
  2. B.sublimation
  3. C.separating funnel
  4. D.chromatography
132
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 ?
  1. A.Sand
  2. B.Sulphur
  3. C.Iron filings
  4. D.Common salt
133
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 ?
  1. A.They are homogeneous mixtures and be classified as metallic alloys
  2. B.The materials are heterogeneous mixtures and can be classified by their components
  3. C.The samples have variable compositions and are classified as metallic solution
  4. D.The samples are heterogeneous mixtures that can be separated using magnetic properties
134
Which flow chart correctly describe a homogeneous materials ?
  1. A.Unknown – density – 3 layers
  2. B.Unknown – filtration – two substances
  3. C.Unknown – magnet – two substances
  4. D.Unknown – boiling – one temperature
135
Magnetism is most beneficial for separating.
  1. A.gases and non – metalic liquids
  2. B.magnetic solids and solids such as sulphur
  3. C.non–metallic solids and solids such as sulphur
  4. D.non–magnetic solids from non–magnetic liquids
136
Distillation is a good separation technique for.
  1. A.solids
  2. B.liquids
  3. C.solid alloys
  4. D.gases
137
Solubility is a good separation technique for.
  1. A.solids
  2. B.liquids
  3. C.solid alloys
  4. D.gases      
138
40g of common salt is dissolved in 320 g of water. The mass percentage of salt is.
  1. A.11.1%
  2. B.12.5%
  3. C.15%
  4. D.10%
139
Water is boiling in open fry pan represents which type of change ?
  1. A.Physical and irreversible
  2. B.Chemical and irreversible
  3. C.Physical and reversible
  4. D.Chemical and reversible
140
Which of the following is a chemical change ?
  1. A.Dent produced on car body by cricket ball
  2. B.Streching of rubber band
  3. C.Brinjals and apples becomes dark on exposure to atmosphere
  4. D.Formation of salts by collecting sea water in shallows pits
141
The cause of Brownian movement is.
  1. A.convection current
  2. B.heat changes in liquid state
  3. C.impact of molecules of dispersion medium on colloidal particles
  4. D.attractive forces between particles of dispersed phase and dispersion medium
142
Which one among the following statements regarding the properties of mixtures and compounds is not correct ?
  1. A.A mixture shows the properties of its constituents but the properties of a compound are entirely different from its constituents
  2. B.A mixture may be homogeneous or heterogeneous but a compound is a homogeneous substance
  3. C.The constitudents of amixture can be separated by physical methods but those of a compound cannot be separated by physical methods
  4. D.Energy is either absorbed or evolved during the preparation of a mixture but not in the preparation of a compound
143
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 ?
  1. A.Condensation point
  2. B.Evaporation point
  3. C.Dew point
  4. D.Point of critical temperature
144
Barrium in a suitable form is administered to patients before an X–ray examination of the stomach, because.
  1. A.barium allows X–rays to pass through the stomach on account of its transparency to X–rays
  2. 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
  3. 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
  4. D.barium salts are white in colour and this helps the stomach to appear clearly in contrast with other regions in the pictures
145
Which one among the following statements about an atoms is not correct ?
  1. A.Atoms always combine to form molecules
  2. B.Atoms are the basic units from which molecules and ions are formed
  3. C.Atoms are always neutral in nature
  4. D.Atoms aggregate in large numbers to form the matter that we can see, feel and touch
146
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:
  1. A.1, 2 and 3
  2. B.1 only
  3. C.1 and 2 only
  4. D.2 only
147
An oxide of nitrogen has molecular weight 30. What is the number of electrons in one molecule of the compound ?
  1. A.14
  2. B.15
  3. C.22
  4. D.23
148
What is the weight of one atom of Hydrogen in grams ?
  1. A.6.023 × 10–23
  2. B.1.66 × 10–24
  3. C.6.62 × 10–24
  4. D.None of these
149
Which among the following is popularly called Hypo ?
  1. A.Silver bromide
  2. B.Silver nitrate
  3. C.Sodium thiosulphate
  4. D.Sodium phosphate
150
The number of neutrons in 27Al13 is.
  1. A.40
  2. B.27
  3. C.14
  4. D.13