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Latest OSPCB Assistant Environmental Engineer Exam Question (Objective Questions), MCQ in English

Subjects : Fluid Mechanics, Heat and Mass Transfer, Ecology, Water Pollution, its control and Treatment, Air Pollution, its control and Treatment, Solid Waste Management and disposal, Environmental Impact Assessment, Data Analysis, Statistics and Probability

Question Bank OSPCB Assistant Environmental Engineer Exam - English
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Fluid Mechanics

Question 1Single Answer
The pressure at a point in a fluid at rest is?
  1. A
    Zero in all directions
  2. B
    Maximum in horizontal direction
  3. C
    Maximum in vertical direction
  4. D
    Same in all directions
Question 2Single Answer
Pascal’s law states that pressure applied to a confined fluid is transmitted?
  1. A
    Only upward
  2. B
    Only downward
  3. C
    Equally and undiminished in all directions
  4. D
    Only horizontally
Question 3Single Answer
The SI unit of pressure is?
  1. C
    Pascal (P
Question 4Single Answer
1 atm is equal to?
  1. A
    760 Pa
  2. B
    100000 Pa
  3. C
    101325 Pa
  4. D
    98100 Pa
Question 5Single Answer
The pressure exerted by a fluid at rest is called?
  1. A
    Hydrostatic pressure
  2. B
    Dynamic pressure
  3. C
    Total pressure
  4. D
    Stagnation pressure
Question 6Single Answer
Absolute pressure is equal to?
  1. A
    Atmospheric pressure only
  2. B
    Gauge pressure – Atmospheric pressure
  3. C
    Gauge pressure + Atmospheric pressure
  4. D
    Vacuum pressure only
Question 7Single Answer
A piezometer tube measures?
  1. A
    Absolute pressure
  2. B
    Gauge pressure at a point
  3. C
    Velocity head
  4. D
    Total head
Question 8Single Answer
Manometers are used to measure?
  1. A
    Density only
  2. B
    Velocity only
  3. C
    Discharge only
  4. D
    Pressure difference between two points
Question 9Single Answer
The simplest form of manometer is?
  1. A
    Piezometer
  2. B
    U-tube manometer
  3. C
    Bourdon gauge
  4. D
    Venturi manometer
Question 10Single Answer
Buoyancy force is equal to?
  1. A
    Volume of the body
  2. B
    Weight of the body
  3. C
    Weight of fluid displaced by the body
  4. D
    Density of the body
Question 11Single Answer
Archimedes’ principle states that?
  1. A
    Buoyant force = weight of displaced fluid
  2. B
    Buoyant force = weight of body
  3. C
    Buoyant force is zero
  4. D
    Buoyant force acts downward
Question 12Single Answer
A body floats in a fluid when?
  1. A
    Buoyant force > weight
  2. B
    Buoyant force = weight of body
  3. C
    Buoyant force < weight
  4. D
    Density of body = 0
Question 13Single Answer
Centre of buoyancy is the?
  1. A
    No centre
  2. B
    Centroid of the body
  3. C
    Centre of gravity of body
  4. D
    Centroid of the displaced fluid volume
Question 14Single Answer
Metacentre is the point where?
  1. A
    No point
  2. B
    Buoyant force acts
  3. C
    Weight acts
  4. D
    Line of action of buoyant force intersects the axis of symmetry
Question 15Single Answer
A floating body is stable when?
  1. A
    Metacentre is below centre of gravity
  2. B
    Metacentre is above centre of gravity
  3. C
    Metacentre coincides with centre of gravity
  4. D
    No metacentre

Heat and Mass Transfer

Question 16Single Answer
The three basic modes of heat transfer are?
  1. A
    Conduction, convection, radiation
  2. B
    Conduction, diffusion, advection
  3. C
    Convection, evaporation, conduction
  4. D
    Radiation, advection, diffusion
Question 17Single Answer
The negative sign in Fourier's law indicates that?
  1. A
    Thermal conductivity is negative
  2. B
    Heat flows from low to high temperature
  3. C
    Heat flows from high temperature to low temperature
  4. D
    No physical meaning
Question 18Single Answer
Newton's law of cooling is the basic relation for?
  1. A
    Conductive heat transfer
  2. B
    Convective heat transfer
  3. C
    Radiative heat transfer
  4. D
    Mass transfer
Question 19Single Answer
The Stefan-Boltzmann law gives the heat flux due to?
  1. A
    Convection
  2. B
    Thermal radiation from a black body
  3. C
    Conduction
  4. D
    Advection
Question 20Single Answer
In steady-state one-dimensional conduction without heat generation, the temperature profile in a plane wall is?
  1. A
    Logarithmic
  2. B
    Parabolic
  3. C
    Linear
  4. D
    Exponential
Question 21Single Answer
For steady-state radial conduction in a cylindrical wall, the temperature profile is?
  1. A
    Logarithmic
  2. B
    Linear
  3. C
    Parabolic
  4. D
    Hyperbolic
Question 22Single Answer
An extended surface (fin) is used to?
  1. A
    Increase the surface area for convection heat transfer
  2. B
    Decrease area
  3. C
    Increase conduction resistance
  4. D
    Reduce temperature
Question 23Single Answer
The optimum length of a fin is determined by?
  1. A
    Minimum length
  2. B
    Maximum heat transfer per unit mass or cost
  3. C
    No optimum
  4. D
    Infinite length
Question 24Single Answer
Forced convection occurs when?
  1. A
    Radiation only
  2. B
    Fluid motion due to density difference
  3. C
    No motion
  4. D
    Fluid motion is caused by external means (fan, pump)
Question 25Single Answer
Natural (free) convection is caused by?
  1. A
    No cause
  2. B
    External fan
  3. C
    Pump
  4. D
    Buoyancy forces due to temperature-induced density difference
Question 26Single Answer
The Grashof number Gr is analogous to?
  1. A
    Nusselt number
  2. B
    Prandtl number
  3. C
    Reynolds number in forced convection
  4. D
    No analogy
Question 27Single Answer
For natural convection, Nusselt number is a function of?
  1. A
    No function
  2. B
    Only Reynolds
  3. C
    Only Mach
  4. D
    Rayleigh number and Prandtl number
Question 28Single Answer
The boundary layer in forced convection develops due to?
  1. A
    No development
  2. B
    Viscous shear at the surface
  3. C
    Only pressure
  4. D
    Only gravity
Question 29Single Answer
In turbulent boundary layer, the majority of resistance to heat transfer lies in?
  1. A
    No resistance
  2. B
    Outer layer
  3. C
    Log layer
  4. D
    Viscous sub-layer
Question 30Single Answer
The turbulent boundary layer grows?
  1. A
    Faster than laminar boundary layer
  2. B
    Slower
  3. C
    Same rate
  4. D
    No growth

Ecology

Question 31Single Answer
Ecology is the scientific study of interactions between?
  1. A
    Organisms and their environment
  2. B
    Only plants and animals
  3. C
    Humans and technology
  4. D
    Chemicals and water
Question 32Single Answer
The term 'environment' includes which of the following components?
  1. A
    Only abiotic factors
  2. B
    Only biotic factors
  3. C
    Biotic and abiotic factors
  4. D
    Only human-made structures
Question 33Single Answer
The basic functional unit of ecology is?
  1. A
    Population
  2. B
    Ecosystem
  3. C
    Community
  4. D
    Biosphere
Question 34Single Answer
Which level of ecological organization includes all ecosystems on Earth?
  1. A
    Biosphere
  2. B
    Community
  3. C
    Ecosystem
  4. D
    Population
Question 35Single Answer
In environmental chemistry, the study of chemical reactions in the atmosphere is known as?
  1. A
    Pedology
  2. B
    Hydrochemistry
  3. C
    Atmospheric chemistry
  4. D
    Soil chemistry
Question 36Single Answer
The process by which pollutants accumulate in higher concentrations in organisms at higher trophic levels is called?
  1. A
    Biosorption
  2. B
    Bioaccumulation
  3. C
    Biodegradation
  4. D
    Biomagnification
Question 37Single Answer
Exponential population growth is described by the equation?
  1. A
    dN/dt = rN
  2. B
    dN/dt = rN (1 - N/K)
  3. C
    N(t) = N0 + rt
  4. D
    N(t) = K / (1 + e^{-rt})
Question 38Single Answer
In exponential growth model, the growth rate is?
  1. A
    Density-dependent
  2. B
    Constant per individual
  3. C
    Decreasing over time
  4. D
    Zero at carrying capacity
Question 39Single Answer
Logistic growth model accounts for?
  1. A
    Unlimited resources
  2. B
    Immigration only
  3. C
    Only birth rates
  4. D
    Carrying capacity (K)
Question 40Single Answer
The equation for logistic growth is?
  1. A
    dN/dt = rN
  2. B
    dN/dt = rN (1 - N/K)
  3. C
    N(t) = N0 e^{rt}
  4. D
    N(t) = K (1 - e^{-rt})

Water Pollution, its control and Treatment

Question 41Single Answer
What is the primary source of surface water resources in India?
  1. A
    Rainwater harvesting
  2. B
    Groundwater
  3. C
    Rivers and lakes
  4. D
    Desalination plants
Question 42Single Answer
Which river basin covers the largest area in India?
  1. A
    Godavari basin
  2. B
    Brahmaputra basin
  3. C
    Indus basin
  4. D
    Ganga basin
Question 43Single Answer
What percentage of India's water resources is utilized for irrigation?
  1. A
    About 10%
  2. B
    About 50%
  3. C
    About 30%
  4. D
    About 80%
Question 44Single Answer
The Central Water Commission in India monitors?
  1. A
    Surface water resources
  2. B
    Air quality
  3. C
    Soil erosion
  4. D
    Forest cover
Question 45Single Answer
Groundwater in India is primarily recharged by?
  1. A
    River seepage
  2. B
    Monsoon rainfall
  3. C
    Snowmelt
  4. D
    Industrial discharge
Question 46Single Answer
Which state in India has the highest groundwater extraction rate?
  1. A
    Punjab
  2. B
    Rajasthan
  3. C
    Tamil Nadu
  4. D
    Kerala
Question 47Single Answer
The National Water Policy of India was last revised in?
  1. A
    2002
  2. B
    2012
  3. C
    1987
  4. D
    2020
Question 48Single Answer
Major water pollutant in Indian rivers from agricultural sources is?
  1. A
    Pesticides and fertilizers
  2. B
    Heavy metals
  3. C
    Oil spills
  4. D
    Thermal pollution
Question 49Single Answer
The Ganga Action Plan was launched in?
  1. A
    2000
  2. B
    1990
  3. C
    1985
  4. D
    1975
Question 50Single Answer
The Yamuna river is most polluted due to?
  1. A
    Agricultural runoff
  2. B
    Industrial effluents from Delhi
  3. C
    Mining activities
  4. D
    Natural sediments
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