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Latest DRDO Senior Technical Assistant Exam Question (Objective Questions), MCQ in English

Subjects : Chemical

Question Bank DRDO CEPTAM Senior Technical Assistant (Chemical) Exam Tier 2 - English
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Chemical

Question 1Single Answer
Stoichiometry is primarily concerned with?
  1. A
    Quantitative relationship between reactants and products
  2. B
    Physical properties of substances
  3. C
    Thermodynamic equilibrium only
  4. D
    Molecular spectroscopy
Question 2Single Answer
The law of conservation of mass states that?
  1. A
    Mass can be created from energy
  2. B
    Mass is neither created nor destroyed in a chemical reaction
  3. C
    Mass is converted into work
  4. D
    Mass decreases during reaction
Question 3Single Answer
A limiting reactant in a reaction is?
  1. A
    The catalyst used in reaction
  2. B
    The reactant in excess
  3. C
    The reactant that gets completely consumed first
  4. D
    None of the above
Question 4Single Answer
The stoichiometric coefficient represents?
  1. A
    Molecular weight of a substance
  2. B
    Number of moles of a species in a reaction
  3. C
    Reaction rate constant
  4. D
    Temperature of reaction
Question 5Single Answer
In a chemical reaction, the mole ratio is?
  1. A
    Ratio of moles of reactants or products as per balanced equation
  2. B
    Ratio of molecular weights
  3. C
    Ratio of volumes only
  4. D
    Ratio of concentrations
Question 6Single Answer
The concept of equivalent weight is used to?
  1. A
    Relate masses of reactants and products in chemical reactions
  2. B
    Measure reaction rate
  3. C
    Determine pressure
  4. D
    Measure temperature
Question 7Single Answer
The stoichiometric balance ensures?
  1. A
    Mass and atoms are conserved
  2. B
    Only mass is conserved
  3. C
    Only energy is conserved
  4. D
    Volume is conserved
Question 8Single Answer
Excess reactant in a reaction?
  1. A
    Reacts completely
  2. B
    Remains unreacted after reaction completion
  3. C
    Acts as catalyst
  4. D
    Converts to heat
Question 9Single Answer
Theoretical yield refers to?
  1. A
    Actual product obtained
  2. B
    Maximum amount of product possible based on stoichiometry
  3. C
    Product lost in reaction
  4. D
    Yield including impurities
Question 10Single Answer
Actual yield is?
  1. A
    The amount of product obtained experimentally
  2. B
    Maximum theoretical product
  3. C
    Yield of reactant
  4. D
    Amount of catalyst used
Question 11Single Answer
Percentage yield is calculated as?
  1. A
    (Theoretical yield / Actual yield) × 100
  2. B
    (Actual yield / Theoretical yield) × 100
  3. C
    (Reactant used / Product forme
  4. D
    × 100
Question 12Single Answer
In stoichiometry, a catalyst is?
  1. A
    Substance that increases reaction rate without being consumed
  2. B
    Limiting reactant
  3. C
    Product formed
  4. D
    Reactant in excess
Question 13Single Answer
The term “mole fraction” is?
  1. A
    None of the above
  2. B
    Ratio of mass to molar mass
  3. C
    Ratio of volume to pressure
  4. D
    Ratio of moles of a component to total moles in mixture
Question 14Single Answer
In a chemical reaction, mass of product is calculated using?
  1. A
    Pressure × Volume
  2. B
    Volume × Density
  3. C
    Moles × Molar mass
  4. D
    Temperature × Pressure
Question 15Single Answer
The concept of limiting reagent helps to?
  1. A
    Calculate pressure
  2. B
    Determine reaction rate only
  3. C
    Measure temperature
  4. D
    Determine maximum product formation
Question 16Single Answer
In chemical engineering, stoichiometry is essential for?
  1. A
    Typing speed
  2. B
    Designing reactors and material balances
  3. C
    Array sorting
  4. D
    Only lab experiments
Question 17Single Answer
The degree of completion of a reaction is called?
  1. A
    Conversion
  2. B
    Yield
  3. C
    Mole fraction
  4. D
    None of the above
Question 18Single Answer
In a batch reactor, stoichiometry helps to?
  1. A
    Calculate required reactants and expected products
  2. B
    Determine temperature only
  3. C
    Measure pressure only
  4. D
    Control pump speed
Question 19Single Answer
The mole concept relates?
  1. A
    Temperature to reaction rate
  2. B
    Pressure to volume
  3. C
    Mass of substance to number of particles
  4. D
    Energy to mass
Question 20Single Answer
In gas-phase reactions, stoichiometry can be expressed in terms of?
  1. A
    Temperature only
  2. B
    Mass only
  3. C
    Energy only
  4. D
    Volume ratios at same temperature and pressure
Question 21Single Answer
For a reaction, the sum of reactants’ and products’ moles multiplied by molar mass gives?
  1. A
    Rate law
  2. B
    Energy balance
  3. C
    Mass balance
  4. D
    Equilibrium constant
Question 22Single Answer
The stoichiometric number of a reactant is?
  1. A
    Always one
  2. B
    Positive
  3. C
    Zero
  4. D
    Negative in balanced chemical equation
Question 23Single Answer
The stoichiometric number of a product is?
  1. A
    Negative
  2. B
    Positive in balanced chemical equation
  3. C
    Zero
  4. D
    None of the above
Question 24Single Answer
In chemical reactions, molar mass is used to convert?
  1. A
    Temperature and energy
  2. B
    Volume and pressure
  3. C
    Between moles and grams
  4. D
    Rate and concentration
Question 25Single Answer
Limiting reagent determines?
  1. A
    Pressure only
  2. B
    Reaction temperature
  3. C
    Maximum amount of product
  4. D
    Reaction rate
Question 26Single Answer
A balanced chemical equation is necessary to?
  1. A
    Calculate density
  2. B
    Measure temperature
  3. C
    Determine pressure only
  4. D
    Perform stoichiometric calculations accurately
Question 27Single Answer
Mole fraction is always?
  1. A
    Greater than 1
  2. B
    Between 0 and 1
  3. C
    Negative
  4. D
    Equal to 100
Question 28Single Answer
Percent excess of reactant is calculated by?
  1. A
    (Moles of product / Total moles) × 100
  2. B
    (Actual yield / Theoretical yield) × 100
  3. C
    (Excess / Stoichiometric requirement) × 100
  4. D
    None of the above
Question 29Single Answer
The theoretical amount of a product is determined by?
  1. A
    Catalyst
  2. B
    Temperature only
  3. C
    Pressure only
  4. D
    Limiting reactant and stoichiometry
Question 30Single Answer
The relationship between reactants and products is given by?
  1. A
    Balanced chemical equation
  2. B
    Phase diagram
  3. C
    Titration curve
  4. D
    Reaction coordinate
Question 31Single Answer
In stoichiometry, 1 mole of any gas at STP occupies?
  1. A
    25 liters
  2. B
    24 liters
  3. C
    20 liters
  4. D
    22.4 liters
Question 32Single Answer
The concept of stoichiometry is applied in?
  1. A
    Array sorting
  2. B
    Typing practice
  3. C
    Only lab experiments
  4. D
    Reactor design and process calculations
Question 33Single Answer
Material balance in chemical engineering is based on?
  1. A
    Law of thermodynamics only
  2. B
    Law of conservation of mass
  3. C
    Kinetic theory
  4. D
    Ideal gas law
Question 34Single Answer
The first law of thermodynamics states?
  1. A
    Heat cannot flow spontaneously
  2. B
    Entropy always increases
  3. C
    Energy cannot be created or destroyed, only transformed
  4. D
    Energy is inversely proportional to temperature
Question 35Single Answer
Enthalpy (H) is defined as?
  1. A
    H = PV – U
  2. B
    H = U – PV
  3. C
    H = U + PV
  4. D
    H = U × PV
Question 36Single Answer
Internal energy (U) of a system depends on?
  1. A
    Only volume
  2. B
    Only pressure
  3. C
    Temperature, pressure, and phase of the substance
  4. D
    Only concentration
Question 37Single Answer
The second law of thermodynamics states?
  1. A
    Entropy of an isolated system never decreases
  2. B
    Energy can be created
  3. C
    Work is independent of heat
  4. D
    Enthalpy is constant
Question 38Single Answer
Gibbs free energy (G) is used to predict?
  1. A
    Work done only
  2. B
    Reaction rate only
  3. C
    Spontaneity of a process at constant temperature and pressure
  4. D
    Enthalpy change
Question 39Single Answer
Entropy (S) is a measure of?
  1. A
    Disorder or randomness in a system
  2. B
    Energy content
  3. C
    Pressure-volume work
  4. D
    Temperature only
Question 40Single Answer
For an ideal gas, the internal energy depends on?
  1. A
    Temperature only
  2. B
    Pressure only
  3. C
    Volume only
  4. D
    Both pressure and volume
Question 41Single Answer
The heat capacity at constant pressure (Cp) is?
  1. A
    Ratio of pressure to volume
  2. B
    At constant volume
  3. C
    Amount of heat required to raise temperature by 1 K at constant pressure
  4. D
    Enthalpy per mole
Question 42Single Answer
The heat capacity at constant volume (Cv) is?
  1. A
    Internal energy per mole
  2. B
    At constant pressure
  3. C
    Enthalpy per mole
  4. D
    Amount of heat required to raise temperature by 1 K at constant volume
Question 43Single Answer
For an ideal gas, the relation between Cp and Cv is?
  1. A
    Cp × Cv = R
  2. B
    Cp + Cv = R
  3. C
    Cp – Cv = R
  4. D
    Cp / Cv = R
Question 44Single Answer
Helmholtz free energy (A) is defined as?
  1. A
    A = U – TS
  2. B
    A = H – TS
  3. C
    A = G + TS
  4. D
    A = PV – U
Question 45Single Answer
A reversible process is one that?
  1. A
    Occurs spontaneously
  2. B
    Can be reversed without leaving any change in the system or surroundings
  3. C
    Increases entropy only
  4. D
    Is irreversible
Question 46Single Answer
An irreversible process is characterized by?
  1. A
    No entropy change
  2. B
    Increase in entropy of universe
  3. C
    Decrease in energy
  4. D
    Constant enthalpy
Question 47Single Answer
Standard enthalpy of formation is?
  1. A
    Enthalpy change when 1 mole of a compound is formed from its elements in standard state
  2. B
    Heat of combustion
  3. C
    Enthalpy of reaction at any condition
  4. D
    Entropy change
Question 48Single Answer
For an isolated system, the total entropy change for a spontaneous process is?
  1. A
    Positive
  2. B
    Negative
  3. C
    Zero
  4. D
    Infinite
Question 49Single Answer
The relation between Gibbs free energy and enthalpy and entropy is?
  1. A
    G = U – TS
  2. B
    G = H – TS
  3. C
    G = H + TS
  4. D
    G = U + PV
Question 50Single Answer
In an adiabatic process, the heat transfer (Q) is?
  1. A
    Zero
  2. B
    Positive
  3. C
    Negative
  4. D
    Equal to work done
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