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Question for BARC Scientific Officer - Quiz / Questions / MCQ in English

Last Update on : October 11, 2026

Duration: 120 · Questions: 100 · Max Marks: 100

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To boost your performance in BARC Scientific Officer exam, practice each question regularly and with focus. Every question tests your subject understanding, so solve them one at a time. Taking a quiz improves your speed and accuracy. Practicing topic-wise MCQs. Students benefit greatly from reviewing questions with answer keys, which help clarify concepts and strengthen Questions knowledge for success in BARC Scientific Officer exams.

Latest BARC Scientific Officer Exam Question (Objective Questions), MCQ in English

Subjects : Mechanical Engineering

Question Bank BARC Scientific Officer Exam (Mechanical Engineering) - English

Mechanical Engineering

Q 1 :
Which of the following is the unit of kinematic viscosity _________________?
  1. A.Pascal
  2. B.Poise
  3. C.Stoke
  4. D.Faraday
  5. E.None of the above
Q 2 :
Consider the following processes:
1. Extension of a spring
2. Plastic deformation of a material
3. Magnetization of a material exhibiting hysteresis
Which of the above process are irreversible?
  1. A.1 and 2 only            
  2. B.1 and 3 only
  3. C.1 only                        
  4. D.1, 2 and 3
Q 3 :
Which of the following statements are correct for a throttling process?
1. It is an adiabatic steady flow process
2. The enthalpy before and after throttling is same
3. In the processes, due to fall in pressure, the fluid velocity at outlet is always more than inlet velocity
  1. A.1 and 2 only            
  2. B.1 and 3 only
  3. C.2 and 3 only                        
  4. D.1, 2 and 3
Q 4 :
A Reversed Carnot Engine removes 50 kW from a heat sink. The temperature of the heat sink is 250 K and the temperature of the heat reservoir is 300 K. The power required of the engine is
  1. A.10 kW      
  2. B.20 kW
  3. C.30 kW    
  4. D.50 kW
Q 5 :
A heat engine receives heat at the rate of 2500 kJ/min and gives an output of 12.4 kW. Its thermal efficiency is, nearly
  1. A.18%                        
  2. B.23%
  3. C.26%                        
  4. D.30%
Q 6 :
Consider the following motions :
1. Piston reciprocating inside an engine cylinder
2. Motion of a shaft between foot-step bearings
Which of the above can rightly be considered as successfully constrained motion?
  1. A.1 only                     
  2. B.2 only
  3. C.Both 1 and 2           
  4. D.Neither 1 nor 2
Q 7 :
A rotor weighing 2 kN is supported on bearings A and B which are 1 m apart. The centre of mass of the rotor is at a distance 0.4 m from bearing A. It is observed that there is an unbalanced couple of magnitude 300 N-m which leaves the shaft balanced statically.The dynamic reactions at the supports will be
  1. A.800 N and 800 N
  2. B.300 N and 800 N
  3. C.800 N and – 300 N
  4. D.300 N and – 300 N
Q 8 :
A cam is a mechanical member used to impart a desired motion to a follower by direct contact. Which one of the under-listed follower motion types will produce the least jerk to the system?
  1. A.Simple harmonic
  2. B.Constant acceleration and deceleration
  3. C.Constant velocity
  4. D.Cycloidal
Q 9 :
In a circular are cam with a roller follower, acceleration of the follower depends on
1. cam speed and location of centre of circular arc
2. roller diameter and radius of circular arc
Which of the above is/are correct?
  1. A.1 only                     
  2. B.2 only
  3. C.Both 1 and 2           
  4. D.Neither 1 nor 2
Q 10 :
A manufacturing company is selling a product for 15 per unit with variable cost of  10 per unit. The fixed cost of the asset is 50,000. How many units should be produced to breakeven?
  1. A.2000                       
  2. B.5000
  3. C.8000                       
  4. D.10000
Q 11 :
A spherical waterdrop of 1 mm in diameter splits up in air into 64 smaller drops of equal size. The surface tension coefficient of water in air is 0.073 N/m. The work required in splitting up the drop is
  1. A.0.96 × 10–6 J            
  2. B.0.69 × 10–6 J
  3. C.0.32 × 10–6 J            
  4. D.0.23 × 10–6 J
Q 12 :
Consider the following statements pertaining to stability of floating bodies:
1. A floating body will be stable when the centre of gravity is above the centre of buoyancy.
2. The position of metacentres corresponding to different axes of rotation are generally different for the same floating object.
3. For cargo ships, the metacentric height varies with loading.
Which of the above statements are correct?
  1. A.1, 2 and 3                
  2. B.1 and 2 only
  3. C.1 and 3 only                        
  4. D.2 and 3 only
Q 13 :
Water is coming out from a tap and falls vertically downwards. At the tap opening, the stream diameter is 20 mm with uniform velocity of 2 m/s. Assuming steady inviscid flow, constant pressure atmosphere everywhere, and neglecting curvature and surface tension effects, the diameter of the stream 0.5 m below the tap opening is nearly
  1. A.11.7 mm                  
  2. B.14.6 mm
  3. C.17.5 mm                  
  4. D.20.4 mm
Q 14 :
Consider the following statements:
1. At low Reynolds numbers of any flow, viscous forces dominate over inertial forces.
2. Transition from laminar to turbulent flow occurs over a range of Reynolds numbers depending on the surface presented to the flow.
Which of the above statements is/are correct?
  1. A.1 only                     
  2. B.2 only
  3. C.Both 1 and 2           
  4. D.Neither 1 nor 2
Q 15 :
In a steady laminar flow of a given discharge through a circular pipe of diameter D, the head loss is proportional to
  1. A.D–1                          
  2. B.D–2
  3. C.D–3                          
  4. D.D–4
Q 16 :
The centre-line velocity in a pipe flow is 2m/s. What is the average flow velocity in the pipe if the Reynolds number of the flow is 800?
  1. A.2 m/s                       
  2. B.1.5 m/s
  3. C.1 m/s                      
  4. D.0.5 m/s
Q 17 :
During a constant pressure expansion of a gas, 33.3% heat is converted into work while the temperature rises by 20 K. The specific heat of the gas at constant pressure as a proportion of work, W is
  1. A.8%                          
  2. B.10%
  3. C.12%                        
  4. D.15%
Q 18 :
A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kg K to 0.4 kJ/kg K. At the same time, the entropy of the surroundings decreases from 80 kJ/kg K to 75 kJ/kg K. The process is
  1. A.reversible and isothermal
  2. B.irreversible
  3. C.reversible only
  4. D.isothermal only
Q 19 :
A reversible heat engine rejects 80% of the heat supplied during a cycle of operation. If the engine is reversed and operates as a refrigerator, then its coefficient of performance shall be
  1. A.6                             
  2. B.5
  3. C.4                             
  4. D.3
Q 20 :
For the same efficiency of the Brayton cycle and the Carnot cycle working between temperature limits of Tmax and Tmin, the power contribution of the Brayton cycle will be
  1. A.zero            
  2. B.maximum
  3. C.minimum
  4. D.50% of the Carnot cycle
Q 21 :
A fin will be more effective when Bio number is
  1. A.Greater than 1
  2. B.Equal to 1
  3. C.Between 1 and 3
                   4        4
  4. D.Less than 1
Q 22 :
A tank of length, breadth and height in the ratio of 2:1:2 is full of water. The ratio of hydrostatic force at the bottom to that at any larger vertical surface is
  1. A.1
  2. B.2
  3. C.3
  4. D.4
Q 23 :
Which of the following fluids exhibit a certain shear stress at zero shear strain rate followed by a straight line relationship between shear stress and shear strain rate?
  1. A.Newtonian fluid 
  2. B.Ideal Bingham plastic fluids
  3. C.Pseudo-plastic fluids
  4. D.Dilatent fluids
Q 24 :
What is the specific gravity of a marble stone, which weighs 400N in air, and 200N in water? (g=10m/s2)
  1. A.8
  2. B.6
  3. C.4
  4. D.2
Q 25 :
What is the intensity of pressure in the following SI units, when specific gravity of mercury is 13.6 and the intensity of pressure is 400KPa ?
  1. A.0.3 bar or 4.077m of water or 0.29 mm of Hg
  2. B.4 bar or 5.077m of water or 0.399 mm of Hg
  3. C.0.3 bar or 5.077m of water or 0.599 mm of Hg
  4. D.4 bar or 4.077m of water or 0.299 mm of Hg
Q 26 :
Consider the following statements:
1.If a small upward displacement is given to a floating body, it results in the reduction of the buoyant force acting on the body
2.A slight horizontal displacement does not change either the magnitude or the location of the buoyant force 
Which of the above statements is/are correct? 
  1. A.Both 1 and 2
  2. B.1 only 
  3. C.2 only
  4. D.Neither 1 nor 2 
Q 27 :
State whether following flow field is physically possible? 
  1. A.Possible for steady, incompressible flow
  2. B.Possible for unsteady, incompressible flow
  3. C.Possible for steady, compressible flow 
  4. D.Not Possible 
Q 28 :
In a differential manometer, a head of 0.5 m of fluid A in limb 1 is found to balance a head of 0.3 m of fluid B in limb 2. The atmospheric pressure is 760 mm of mercury. The ratio of specific gravities of A to B is
  1. A.0.25
  2. B.0.26
  3. C.2
  4. D.4
Q 29 :
A Reversed Carnot Engine removes 50 kW from a heat sink. The temperature of the heat sink is 250 K and the temperature of the heat reservoir is 300 K. The power required of the engine is
  1. A.10 kW 
  2. B.20 kW
  3. C.30 kW
  4. D.50 kW
Q 30 :
On which of the following just in time manufacturing philosophy emphasizes ?
  1. A.man power
  2. B.profit
  3. C.inventory
  4. D.manufacturing
Q 31 :
In a stream line steady flow, two points A and B on a stream line are 1m apart and the flow velocity varies uniformly from 2m/s to 5m/s. What is the acceleration of fluid at B?
  1. A.3 m/s2
  2. B.6 m/s2
  3. C.9 m/s2
  4. D.15 m/s2
Q 32 :
The stream function is given by Ψ = 3xy, then the velocity at the point (2,3) is
  1. A.9
  2. B.-6
  3. C.117
  4. D.10.8
Q 33 :
The boundary layer thickness at a given distance from the leading edge of a flat plate is
  1. A.More for lighter fluid
  2. B.More for denser fluid
  3. C.Less for denser fluid
  4. D.Less for lighter fluid
Q 34 :
In a laminar flow through a circular pipe, the discharge varies
  1. A.Linearly with fluid density
  2. B.Inversely with pressure drop
  3. C.Directly as square of pipe radius
  4. D.Inversely with fluid velocity
Q 35 :
A fluid is flowing over a flat plate. At distance of 8 cm from the leading edge, the Reynolds number is found to be 25600. The thickness of the boundary layer at this point is
  1. A.1.5mm
  2. B.2.5mm
  3. C.4.0mm
  4. D.5.0mm
Q 36 :
Air is flowing over a flat plate with a free stream velocity of 24 m/s, and its kinematic viscosity is 72 ×10-6m2/s. If at a particular point, the Reynolds number is 30000, its location from the leading edge is
  1. A.0.05m 
  2. B.0.07m
  3. C.0.08m
  4. D.0.09m
Q 37 :
In a refrigerator, the evaporator and condenser coil temperatures are –33°C and 27°C, respectively. Assuming that the maximum COP is realized, the required power input for a refrigerating effect of 4 kW is
 
  1. A.8 kW     
  2. B.4 kW
  3. C.2 kW    
  4. D. 1 kW
Q 38 :
In a hydraulic coupling
  1. A.The magnitudes of input and output torques are equal
  2. B.The magnitudes of input torque is greater than output torque
  3. C.The magnitudes of input torque is less than output torque
  4. D.The magnitudes of input torque is negligible as compared to output torque 
Q 39 :
Consider the following statements:
1.The wheel can be operated freely in air
2.Pressure at the exit of the nozzle is atmospheric
3.Pressure does not vary along the moving vanes
4.Change the direction of momentum imparts thrust over moving vanes Which of the following statements are applied to impulse turbine?
  1. A.1,2 and 3 only
  2. B.1,2 and 4 only
  3. C.3 and 4 only
  4. D.1,2, 3 and 4 
Q 40 :
A water jet 0.0015m2in area issues from a nozzle with 15 m/s velocity. It is made to impinge perpendicular on to a plate that moves away from the jet with a velocity of 5 m/s. The force on the plate due to this impact is
  1. A.150 N
  2. B.1470 N
  3. C.340 N
  4. D.900 N
Q 41 :
Consider the following statements with regard to hydraulic turbines:
1.Kaplan turbines are most efficient at part load operations.
2.If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.
3.The flow ratio of Francis turbines are in the range of 0.1 – 0.3. 
Which of the above statements is/are correct? 
  1. A.1,2 and 3
  2. B.1 and 2 only
  3. C.1 and 3 only
  4. D.2 and 3 only
Q 42 :
Which of the following is a Vector quantity ?
  1. A.Energy 
  2. B.Mass
  3. C.Momentum
  4. D.Angle
Q 43 :
Bernoulli’s equation is applicable between any two points located in
  1. A.Rotational flow of an incompressible fluid
  2. B.Irrotational flow of compressible or incompressible fluid
  3. C.Steady, rotational flow of an incompressible fluid
  4. D.Steady, irrotational flow of an incompressible fluid 
Q 44 :
Water flows through a smooth circular pipe of diameter D and length L because of a pressure difference ΔP across the length. The volume flow rate is Q and the flow is turbulent with Reynolds number 105. If the pressure difference is increased to 4ΔP the volume flow rate will be
  1. A.2Q
  2. B.A little more than 2Q
  3. C.A little less than 2Q
  4. D.4Q
Q 45 :
 Heat is lost from a 100 mm diameter steam pipe placed horizontally in ambient air at 30°C. If the Nusselt number is 25 and the thermal conductivity of the air is 0.03 W/m K, then the heat transfer coefficient will be
  1. A. 7.5 W/m2K      
  2. B.15 W/m2K
  3. C.25 W/m2K      
  4. D. 35 W/m2K
Q 46 :
For laminar flow through a round pipe, the shear stress
  1. A.Remains constant over the cross-section
  2. B.Varies linearly with the radial distance
  3. C.Must be zero at all point 
  4. D.Varies parabolically with radial distance
Q 47 :
Percentage clongation during tensile test is indicative of
  1. A.Creep
  2. B.Malleability
  3. C.Ductility
  4. D.Elasticity in the metal
Q 48 :
Which of the above statements is not correct in the context of laminar flow through a pipeline?
  1. A.Shear stress is zero at the center and varies linearly with pipe radius
  2. B.Head loss is proportional to square of the average flow velocity
  3. C.The friction factor varies inversely with flow Reynolds number
  4. D.No dispersion of die injected into the flow stream
Q 49 :
Laminar flow between closely spaced parallel plates is governed by the consideration of which one of the following pair of forces?
  1. A.Pressure and inertial forces
  2. B.Gravity and inertial forces
  3. C.Viscous and inertial forces
  4. D.Pressure and inertial forces
Q 50 :
Formation and collapse of vapour bubbles are believed to be the root cause for cavitation in hydraulic turbines. Most favorable condition for the formation of bubbles is set in the turbine at
  1. A.Penstock/nozzl
  2. B.Guide vanes/Inlet of the runner
  3. C.Vanes receiving impact of jet
  4. D.Outlet of the runner/Entrance of the draft tube 

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