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Objective Questions

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

Subjects : Computer Science, Reasoning, Mechanical, Quantitative Aptitude, General Knowledge

Question Bank ECIL Scientific Officer Officer Exam (Mechanical) - English
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Computer Science

Question 1Single Answer
When two number are added in excess-3 code and the sum is less than 9 , then in order to get the correct answer it is necessary to
  1. A
    subtract 0011 from the sum
  2. B
    add 0011 to the sum
  3. C
    subtract 0110 from the sum
  4. D
    add 0110 to the sum
Question 2Single Answer
The characteristic equation of an SR filp-flop is given by
  1. A
    Qn+1 = S+RQn          
  2. B
    Qn+1 = S n+   Qn 
  3. C
    Qn+1 =  + RQn  
  4. D
    Qn+1 = S+ Qn 
Question 3Single Answer
A graph with n vertices and n-1 edges that is not a tree , is
  1. A
    Connected 
  2. B
    disconnected
  3. C
    Euler  
  4. D
    A circuit
Question 4Single Answer
Networks that use different technologies can be connected by using
  1. A
    Packets
  2. B
    Switches
  3. C
    Bridges
  4. D
    Routers
Question 5Single Answer
A read bit can be read
  1. A
    and written by CPU
  2. B
    and written by peripheral
  3. C
    by peripheral and written by CPU
  4. D
    by CPU and written by the peripheral
Question 6Single Answer
The term ‘aging’ refers to
  1. A
    booting up the priority of the process in multi-level of queue without  feedback  .
  2. B
    gradually increasing the priority of job that wait in the system for a long  time to remedy infinite booking .
  3. C
    keeping track of the following a page has been in memory for the purpose of LRU replacement .
  4. D
    letting jobs reside in memory for a certain amount of time so that the no pages required can be estimated accurately
Question 7Single Answer
Consider a set of n tasks with known runtimes r1 ,r2………….. rn  To be run on a uni processor machine . Which of the following processer scheduling algorithms will result in the maximum throughput ?
  1. A
    Round Robin
  2. B
    Shortest job first
  3. C
    Highest response ratio first
  4. D
    First come first served
Question 8Single Answer
Consider a job scheduling program with 4 jobs J1 , J2, J3 and J4  With corresponding deadlines : (d1 , d2 , d3 , d4) = (4, 2, 4, 2). Which of the following is not a feasible schedule without violating any job schedule?
  1. A
    J2, J4, J1, J3       
  2. B
    J4, J1, J2, J3
  3. C
    J4, J2, J1, J3   
  4. D
    J4, J2, J3, J1
Question 9Single Answer
By using a eight bit optical encoder the degree of resolution that can be obtained is (approximately)
  1. A
    1.8o       
  2. B
    3.4 o
  3. C
    2.8 o   
  4. D
    1.4 o
Question 10Single Answer
The principal of the locality of reference justifies the use of
  1. A
    virtual memory            
  2. B
    interrupts
  3. C
    main memory    
  4. D
    cache memory

Reasoning

Question 11Single Answer
‘Gram’ is relatd to ‘Mass’ in the same way as ‘Centimetre’ is related to
  1. A
    Area
  2. B
    Volume
  3. C
    Length
  4. D
    Sound
  5. E
    Energy
Question 12Single Answer
'Mustard' is related to 'Seed' in the same way as 'Carrot' is related to
  1. A
    Fruit
  2. B
    Stem
  3. C
    Flower
  4. D
    Root
  5. E
    None of these
Question 13Single Answer
Which of the following pairs of words have the same relationship as Fan : Heat?
  1. A
    Water        :           Drink
  2. B
    Light         :        Night
  3. C
    Teach       :      Student
  4. D
    Air             :        Breathe
  5. E
    Food         :        Hunger
Question 14Single Answer
'Radish' is related to 'Root', in the same way as 'Brinjal' is related to
  1. A
    Fruit
  2. B
    Stem
  3. C
    Flower
  4. D
    Root
  5. E
    None of these
Question 15Single Answer
'Jackal' is related to 'Carnivorous', in the same way as 'Goat' is related to
  1. A
    Omnivorous
  2. B
    Carnivorous
  3. C
    Herbivorous
  4. D
    Multivorous
  5. E
    None of these
Question 16Single Answer
Which of the following pairs has similar relationship as Run : Race?
  1. A
    Party : Dance
  2. B
    Study : Book
  3. C
    Lecture : Study
  4. D
    Enjoy : Journey
  5. E
    None of these
Question 17Single Answer
Which of the following has same relationship as that of Money : Wealth?
  1. A
    Pity : Kindness
  2. B
    Cruel : Anger
  3. C
    Wise : Education
  4. D
    Pride : Humility
  5. E
    None of these
Question 18Single Answer
Which of the following is related to ‘Melody’, in the same way as ‘Delicious’ is related to 'Taste'?
  1. A
    Memory
  2. B
    Highness
  3. C
    Tongue
  4. D
    Speak
  5. E
    Voice
Question 19Single Answer
Offhand’ is related to ‘Premeditation’ in the same way as ‘Above board’ is related to
  1. A
    Integrity
  2. B
    Honesty
  3. C
    Guide
  4. D
    Competition
  5. E
    None of these
Question 20Single Answer
5 : 7 : : ? : 28
  1. A
    20
  2. B
    14
  3. C
    56
  4. D
    26
  5. E
    None of these
Question 21Single Answer
Which one is different form the remaining three?
  1. A
    GIJK
  2. B
    DFGH
  3. C
    CEFG
  4. D
    ABCD
  5. E
    None of these
Question 22Single Answer
Three of the following four are alike in certain way and so form a group. Which is one that does not belong to the group?
  1. A
    71
  2. B
    73
  3. C
    77
  4. D
    67
  5. E
    None of these
Question 23Single Answer
Unscramble the letters in the given words and find the odd one out.
  1. A
    UMRSME
  2. B
    EIWNTR
  3. C
    PIGRSN
  4. D
    LCUOD
  5. E
    None of these
Question 24Single Answer
What should come next in the following number series?
0 2 4 6 2 3 0 2 4 6 4 5 0 2 4 6 6 7 0 2?
  1. A
    4
  2. B
    2
  3. C
    6
  4. D
    8
  5. E
    5
Question 25Single Answer
What will be there is the place of question mark in the following series?
E G 3 5, I K 9 9, M O 1 9 5, Q S 3 2 3?
  1. A
    UW483
  2. B
    ZA26
  3. C
    TU420
  4. D
    ST380
  5. E
    None of these

Mechanical

Question 26Single Answer
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
Question 27Single Answer
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
Question 28Single Answer
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
Question 29Single Answer
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
Question 30Single Answer
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
Question 31Single Answer
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 
Question 32Single Answer
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 
Question 33Single Answer
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
Question 34Single Answer
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
Question 35Single Answer
On which of the following just in time manufacturing philosophy emphasizes ?
  1. A
    man power
  2. B
    profit
  3. C
    inventory
  4. D
    manufacturing
Question 36Single Answer
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
Question 37Single Answer
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
Question 38Single Answer
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
Question 39Single Answer
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
Question 40Single Answer
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
Question 41Single Answer
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
Question 42Single Answer
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
Question 43Single Answer
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 
Question 44Single Answer
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 
Question 45Single Answer
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
Question 46Single Answer
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
Question 47Single Answer
Which of the following is a Vector quantity ?
  1. A
    Energy 
  2. B
    Mass
  3. C
    Momentum
  4. D
    Angle
Question 48Single Answer
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 
Question 49Single Answer
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
Question 50Single Answer
 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
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