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Objective Questions

Latest OSPCB Junior Laboratory Assistant Exam Question (Objective Questions), MCQ in English

Subjects : General Science, Subject-specific Knowledge, Quantitative Aptitude, Logical Reasoning, General Awareness

Question Bank OSPCB Junior Laboratory Assistant Exam - English
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General Science

Question 1Single Answer
Temperature can be expressed as derived quantity in terms of
  1. Alength and mass
  2. Bmass and time
  3. Clength, mass and time
  4. DNone of these
Question 2Single Answer
Electron volt is a unit of
  1. Apotential difference
  2. Bcharge
  3. Cenergy
  4. Dcapacity
Question 3Single Answer
Dimensions of impulse are
  1. A[MLT –1]
  2. B[MLT²]
  3. C[MT–2]
  4. D[ML–1T–3]
Question 4Single Answer
Potential is measured in
  1. Ajoule/coulomb
  2. Bwatt/coulomb
  3. Cnewton–second
  4. DNone of these
Question 5Single Answer
One Nanometer is equal to
  1. A10–9m
  2. B10–6m
  3. C10–10m
  4. D10–3m
Question 6Single Answer
Maxwell is the unit of
  1. Amagnetic susceptibility
  2. Bintensity of Magnetisation
  3. Cmagnetic Flux
  4. Dmagnetic Permeability
Question 7Single Answer
Which of the following is derived physical quantity ?
  1. AMass
  2. BVelocity
  3. CLength
  4. DTime
Question 8Single Answer
Which of the following is not a synthetic fibre:
  1. AAnygora
  2. BRayon
  3. CNylon
  4. DPolyster
Question 9Single Answer
Which one of the following is not contained in Portland cement ?
  1. ACa3Al2O6
  2. BCa3SiO5
  3. CCa2Si­O4
  4. DCa3(PO4)2
Question 10Single Answer
What is the reson for white cement to be white ?
  1. AIt does not contain carbon
  2. BIt does not contain silicon
  3. CIt does not contain iron
  4. DIt does not contain calcium
Question 11Single Answer
Which fertilizer is assimilated directly by the plant ?
  1. ASuper phosphate
  2. BNitrolim
  3. CMuriate of Potash
  4. DHumus
Question 12Single Answer
Which of the following chemicals is used in foam fire extinguishers ?
  1. AAluminium sulphate
  2. BCopper sulphate
  3. CCobalt sulphate
  4. DNickel sulphate 
Question 13Single Answer
What is a mixture of potassium nitrate, powdered charcoal and sulphur called ?
  1. AGlass
  2. BCement
  3. Cpaint
  4. DGun powder
Question 14Single Answer
Which one of the following chemicals is used in beauty parlours for hair – setting ?
  1. ASulphur based
  2. BPhosphorus based
  3. CSilicon based
  4. DIron based 
Question 15Single Answer
Which of the following contain enzymes for cellular respiration ?
  1. ADictyosomes
  2. BEndoplasmic reticulum
  3. Clysosomes
  4. DMitochondria
Question 16Single Answer
Which one among the following nutrients is a strctural
  1. ACell membrane
  2. BPlasma membrane
  3. CCell wall
  4. DNucleus
Question 17Single Answer
Which one among the following nutrients is a structural component of the cell wall of plants ?
  1. AManganese
  2. BPotassium
  3. CPhosphorus
  4. DCalcium
Question 18Single Answer
Which of the following groups is present in animal cells ?
  1. AMitochondria, Cell membrane, Cell wall, Cytoplasm
  2. BChloroplasts, Cytoplasm, Vacuole, Nucleus
  3. CNucleus, Cell membrane, Mitochondria, Cytoplasm
  4. DVacuole, cell membrane, Nucleus, Mitochondria
Question 19Single Answer
For which among the following is not a true fruit ?
  1. AApple
  2. BDate
  3. CGrape
  4. DPlum
Question 20Single Answer
Which one of the following is not a constituent of cell membrane ?
  1. ACholesterol
  2. BGlycoplids
  3. CProline
  4. DPhospholipids

Subject-specific Knowledge

Question 21Single Answer
Which subatomic particle has negligible mass and negative charge?
  1. AProton
  2. BNeutron
  3. CPositron
  4. DElectron
Question 22Single Answer
The atomic number of an element is equal to the number of?
  1. AProtons in the nucleus
  2. BNeutrons in the nucleus
  3. CElectrons in the outermost shell
  4. DTotal nucleons
Question 23Single Answer
Isotopes of an element have the same?
  1. AAtomic number but different mass number
  2. BMass number but different atomic number
  3. CNumber of neutrons
  4. DChemical properties only
Question 24Single Answer
The modern periodic table is arranged in order of increasing?
  1. AElectronegativity
  2. BAtomic mass
  3. CAtomic number
  4. DValency
Question 25Single Answer
Elements in the same group of the periodic table have the same?
  1. AIonization energy
  2. BAtomic radius
  3. CNumber of valence electrons
  4. DElectronegativity
Question 26Single Answer
The trend of atomic radius across a period from left to right is?
  1. AIncreases
  2. BDecreases
  3. CRemains constant
  4. DFirst increases then decreases
Question 27Single Answer
Ionic bonding occurs between?
  1. ANoble gases
  2. BTwo non-metals
  3. CTwo metals
  4. DMetals and non-metals
Question 28Single Answer
In covalent bonding, electrons are?
  1. AShared between atoms
  2. BTransferred from one atom to another
  3. CLost completely
  4. DGained completely
Question 29Single Answer
Boyle’s law states that at constant temperature, the volume of a gas is inversely proportional to its?
  1. AMass
  2. BTemperature
  3. CNumber of moles
  4. DPressure
Question 30Single Answer
Charles’s law relates the volume of a gas to its?
  1. ADensity
  2. BPressure at constant temperature
  3. CMass
  4. DTemperature at constant pressure
Question 31Single Answer
The pH of a neutral solution at 25°C is?
  1. A7
  2. B0
  3. C14
  4. D1
Question 32Single Answer
pOH of a solution is related to pH as?
  1. ApH / pOH = 14
  2. BpH - pOH = 14
  3. CpH × pOH = 14
  4. DpH + pOH = 14
Question 33Single Answer
A buffer solution resists change in?
  1. AVolume
  2. BTemperature
  3. CpH on addition of small amount of acid or base
  4. DColor
Question 34Single Answer
The indicator phenolphthalein changes color in the pH range?
  1. A6.2 – 7.6
  2. B3.1 – 4.4
  3. C4.2 – 6.3
  4. D8.2 – 10.0
Question 35Single Answer
Methyl orange is suitable for titration between?
  1. AWeak acid and weak base
  2. BStrong acid and strong base
  3. CWeak acid and strong base
  4. DStrong acid and weak base
Question 36Single Answer
Biochemical Oxygen Demand (BOd) measures?
  1. ATotal dissolved solids
  2. BChemical oxygen demand
  3. CAmount of oxygen required by microorganisms to decompose organic matter
  4. DWater hardness
Question 37Single Answer
Chemical Oxygen Demand (COd) is determined by?
  1. ATitration with EDTA
  2. BMicrobial degradation
  3. COxidation with potassium dichromate in acidic medium
  4. DGravimetric method
Question 38Single Answer
COD value is generally?
  1. ALower than BOD
  2. BHigher than BOD for the same sample
  3. CEqual to BOD
  4. DUnrelated to BOD
Question 39Single Answer
Total Dissolved Solids (TDS) in water is measured by?
  1. ATitration
  2. BFiltration only
  3. CDistillation
  4. DEvaporating filtered sample and weighing residue
Question 40Single Answer
High TDS in water mainly affects?
  1. ABOD
  2. BTaste, palatability and scaling in boilers
  3. CCOD
  4. DpH only
Question 41Single Answer
Temporary hardness in water is due to?
  1. ABicarbonates of Ca and Mg
  2. BChlorides of Ca and Mg
  3. CSulphates of Ca and Mg
  4. DNitrates of Ca and Mg
Question 42Single Answer
Ozone depletion in the stratosphere is mainly caused by?
  1. ACarbon dioxide
  2. BChlorofluorocarbons (CFCs)
  3. CSulfur dioxide
  4. DNitrogen oxides
Question 43Single Answer
The Montreal Protocol is associated with?
  1. AControl of acid rain
  2. BReduction of greenhouse gases
  3. CPhase-out of ozone-depleting substances
  4. DWater pollution
Question 44Single Answer
In the periodic table, halogens belong to?
  1. AGroup 18
  2. BGroup 1
  3. CGroup 2
  4. DGroup 17
Question 45Single Answer
The bond in HCl is?
  1. ANon-polar covalent
  2. BIonic
  3. CPolar covalent
  4. DMetallic
Question 46Single Answer
According to Boyle’s law, if pressure doubles at constant temperature, volume becomes?
  1. ADouble
  2. BHalf
  3. CSame
  4. DFour times
Question 47Single Answer
A buffer solution contains a weak acid and its?
  1. AConjugate base
  2. BStrong acid
  3. CStrong base
  4. DSalt only
Question 48Single Answer
The color change range of bromothymol blue is?
  1. A4.2 – 6.3
  2. B6.0 – 7.6
  3. C8.2 – 10.0
  4. D3.1 – 4.4
Question 49Single Answer
BOD test is used to assess?
  1. AOrganic pollution in water
  2. BInorganic pollution
  3. CHeavy metals
  4. DpH
Question 50Single Answer
High COD/BOD ratio indicates?
  1. AHigh biodegradability
  2. BPresence of non-biodegradable organics
  3. CLow pollution
  4. DNeutral water
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