MPSC Forest Service Question paper set 8

1. The dynamic viscosity of most of the gases_________ with rise in temperature.

i) Increases

ii) Decreases

iii) Does not change significantly

iv) None of these.

 

Ans:-  i) Increases

 

2. Buoyant force is_______.

i) Resultant of up thrust and gravity forces acting on the body.

ii) Resultant force on the body due to the fluid surrounding it.

iii) Equal to the volume of liquid displaced by the body.

iv) Resultant of static weight of body and dynamic thrust of liquid.

 

Ans:- Update soon.

 

3. The type of flow in which the velocity of every particle varies from point to point, or every instant, in direction and magnitude is called as:

i) Laminar flow

ii) Uniform flow

iii) Steady flow

iv)Turbulent flow

 

Ans:- iv) Turbulent flow

 

4. The point in the immersed body through which the result pressure of liquid may be taken to act is known as:

i) Centre of buoyancy

ii) Metacentre

iii) centre of gravity

iv)Centre of pressure

 

Ans:-  iv) Centre of pressure

 

5. The condition at which a piezometer cannot be used:

i)Velocity is high

ii) Pressure difference is low

iii) Fluid is highly viscous

iv) Fluid in the pipe is a gas

 

Ans:-  iv) Fluid in the pipe is a gas

 

6. ______ changes with coefficient of discharge of an orifice.

i)Reynold’s number

ii) Weber number

iii) Froude number

iv) Mach number

 

Ans:- i)Reynold’s number

 

7. Bernoulli’s equation cannot be applied when the flow is:

i) Unsteady

ii) Rotational

iii) Turbulent

iv) All of the above

 

Ans:-  iii) Turbulent

 

8. A body is placed inside a tank. If one meter water column is present above the object, what will be the present acting upon it?

i)1 Pa

ii) 9810 Pa

iii) 981 Pa

iv) 98.1 Pa

 

Ans:-  ii) 9810 Pa

 

9. Which among the following possesses highest density?
10. i) Carbon tetrachloride
11. ii) Air

iii) Glycerin

iv) Castor oil

 

Ans:- i) Carbon tetrachloride

 

10. _______ is a regular shaped opening on one side of the liquid vessel provided for quantity measurement, with the liquid surface kept below the top edge of it.

i)Orifice

ii)Weir

iii)Notch

iv) None of these.

 

Ans:- iii)Notch

 

11. The discharge through right angled notch, if the cd is 0.6, wills be_________.

i)4.171 H^5/2

ii)1.417 H^5/2

iii)0.417 H^5/2

iv) 7.141 H^5/2

 

Ans:-  ii)1.417 H^5/2

 

12. The top of weir is known as:

i)Sill or crest

ii)Orifice

iii)Nappe or van

iv) None of these

 

Ans:-  i)Sill or crest

 

13. The hammer blow effect occurs in pipes due to______.

i)The flow of liquid gradually brought to rest by closing the valve

ii)The excessive leakage

iii)Bursting under high pressure of liquid

iv) Sudden stopping of flow

 

Ans:-  iv) Sudden stopping of flow

 

14. Impulse turbine may be utilized at streams having________.

i)High discharge

ii) High head.

iii) Low head

iv) Medium head

 

Ans:-  ii) High head.

 

15. The ratio of quantities of liquid discharged from pimp to that passing through impeller at unit time is known as_______.

i)Mechanical efficiency

ii)Overall efficiency

iii) Volumetric efficiency

iv) Manometric efficiency

 

Ans:-  iii) Volumetric efficiency

 

16. The percentage of power saving may be attained in a single acting reciprocating pump by the installation of an air vessel is:

i)48.8%

ii)78.4%

iii)84.4%

iv)39.2%

 

Ans:-  iii)84.4%

 

17. For the stability of a floating body, under the influence of gravity alone, which of the following is true?

i)Metacenter should be below center of gravity

ii) Metacenter should be above center of gravity

iii) Metacenter and centre of gravity must lie on same horizontal line

iv) Metacenter and centre of gravity must lie on the same vertical line

 

Ans:-  ii) Metacenter should be above center of gravity

 

18. The property of material which helps in coining, ornament works and forging is: 

i) Plasticity

ii)Ductility

iii)Elasticity

iv) Malleability

 

Ans:-  Update soon

 

19. _______ of the thermosetting plastics can be irreversibly formed into shape, under heat and pressure.

i)Some

ii)None

iii)All

iv)None of these

Ans:- iii)All

 

20. In a reciprocating IC engine, the gudgeon pin forms the link between.

i)Piston and big end of connecting rod

ii)piston and small end of connecting rod

iii)Connecting rod and crank

iv)Big end and small end

 

Ans:- ii)piston and small end of connecting rod

 

21. The ratio of Actual thermal efficiency to the Air standard efficiency gives:

i)Mechanical efficiency

ii)Actual air standard efficiency

iii)Relative efficiency

iv) Theoretical thermal efficiency

 

Ans:-  iii)Relative efficiency

 

22. The efficiency of diesel cycle is same as:

i)Otto cycle

ii)Stirling cycle

iii)Carnot cycle

iv)Ericsson cycle

 

Ans:- ii)Stirling cycle

 

23. For the same compression ratio and heat input, arrange the efficiencies of various cycles in decreasing order:

i)Otto, Dual, Diesel

ii)Otto, Diesel, Dual

iii)Diesel, Otto, Dual

iv) Dual, Diesel, Otto

 

Ans:-  i)Otto, Dual, Diesel

 

24. The major loss in a CI engine is:

i)Direct heat loss

ii) Friction loss

iii)Pumping loss

iv) Loss due to incomplete combustion

 

Ans:- iv) Loss due to incomplete combustion

 

25. Advantage of gaseous fuel is that:

i)It can be stored easily

ii) It can mix easily with air

iii)It can displace more air from the engine

iv) All of the above

 

Ans:- ii) It can mix easily with air

 

26. Octane number of iso-octane is:

i)0

ii)96

iii)69

iv)100

 

Ans:- iv)100

 

27. The lean air mixture is required during:

i)Cruising

ii)Idling

iii)Starting

iv)Accelerating

 

Ans:- i)Cruising

 

28. Modern carburetors provide the correct quality of air-fuel mixture during:

i)Starting

ii)idling

iii)cruising

iv) all conditions

 

Ans:- iv) all conditions

 

29. Common rail injection system uses injection pressure of the order:
30. i) 100 – 200 bar
31. ii) 200 – 400 bar

iii) 400 – 600 bar

iv) 1500 bar

 

Ans:- iv) 1500 bar

 

30. A wall of length 4 m, height 3 m and thickness 0.4 m, has the inner wall surface at 140⁰C and that the outer at 20⁰ If the thermal conductivity of wall material is 0.85 W/mK, the temperature at 10 cm from the inner wall is:

i)120⁰C

ii)90⁰C

iii)110⁰C

iv)80⁰C

 

Ans:-  iii)110⁰C

 

31. Convective heat transfer is quantified by:

i)Fourier’s law

ii)Newton’s law

iii)Stefan-Boltzmann law

iv)Kirchhoff’s law

 

Ans:- ii)Newton’s law

 

32. For a black body:

i)Absorption is maximum

ii)Radiation is maximum

iii) Reflection is zero

iv) All the above

 

Ans:-  iv) All the above

 

33. A gray body is a:

i)Ordinary body

ii)Opaque body

iii) Black body

iv) White body

 

Ans:- i)Ordinary body

 

34. Select the positive displacement compressor:

i)Roots blower

ii)Vane blower

iii)Reciprocating compressor

iv)All the above

 

Ans:-  iv)All the above

 

35. When equal and opposite forces applied to a body, tend to elongate it, the stress to produced is called:
36. i) Shear stress

ii)Compressive stress

iii)Tensile stress

iv) Transverse Stress

 

Ans:- iii)Tensile stress

 

36. The property of a material by which it can be drawn, due to tension to a smaller section is called:

i)Plasticity

ii)Ductility

iii)Elasticity

iv) Malleability

 

Ans:- ii)Ductility

 

37. Factor of safety is the ratio of:

i)Yield stress and working stress

ii)Tensile stress and working stress

iii)Compressive stress and working stress

iv)Bearing stress and yield stress

 

Ans:- i)Yield stress and working stress

 

38. The shape of the bending moment diagram over the length of a beam, carrying a uniformly distributed is always:
39. i) Linear

ii)Parabolic

iii)Cubical

iv)Circular

 

Ans:- ii)Parabolic

 

39. A beam is said to be of uniform strength if:

i)B.M. is same throughout the beam

ii)Shear stress is same through the beam

iii)Deflection is same throughout the beam

iv) Bending stress is same at every section it’s longitudinal axis

 

Ans:- iv) Bending stress is same at every section it’s longitudinal axis

 

40. The ratio of the effective length of a column and minimum radius of gyration of it’s cross-sectional area, is knbown as:

i)Buckling factor

ii)Slenderness ratio

iii)Crippling factor

iv)None of these

 

Ans:- ii)Slenderness ratio

 

41. Struts are load carrying members of a frame structure which are subjected to:

i)Axial tension loads

ii)Axial compressive loads

iii)Torsional loads

iv) Transverse loads

 

Ans:- ii)Axial compressive loads

 

42. The portion of a brick cut across the width is called:

i)Closer

ii)Half brick

iii)Bed

iv)bat

 

Ans:- iv)bat

 

43. A beam is defined as a structural member subjected to:

i)Axial loading

ii) transverse loading

iii) Axial and transverse loading

iv) None of the above

 

Ans:- ii) transverse loading

 

44. Long column is one:

i)Which is more than 3 m long

ii)Whose lateral dimension is less than 25 cm

iii) Which is free at it’s top

iv) Which has a ratio effective length to least lateral dimension more than 15

 

Ans:- iv) Which has a ratio effective length to least lateral dimension more than 15

 

45. When two plates are placed end to end and joined by cover plates, the joint is known as:

i)Lap joint

ii)Butt joint

iii)Chain riveted lap joint

iv)Double cover joint

 

Ans:- iv)Double cover joint

 

46. The gross diameter of a rivet the diameter of:

i)Cold rivet measured before driving

ii)Rivet measured after driving

iii)Rivet hole

iv) None of the above

 

Ans:- ii)Rivet measured after driving

 

47. Side welds carry:

i)Shear stresses only

ii)Tensile stresses only

iii)Both shear and tensile stresses

iv) None of the above

 

Ans:- i)Shear stresses only

 

48. An imaginary line along which rivets are placed is known as:

i)Rivet line

ii)Gauge line

iii)Back line

1. iv) All of the above

 

Ans:- ii)Gauge line

 

49. Which one of the following is the mode of failure in fillet weld material?

i)Tension

ii)Shear

iii)Bearing

iv)Crushing

 

Ans:- ii)Shear

 

50. Sandstone is:

i)Sedimentary rock

ii)Metamorphic rock

iii)Igneous rock

iv) Volcanic rock

 

Ans:-  i)Sedimentary rock

 

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