Science Online Exam: MCQ Quiz!
.
- 1.
A steel bar of 5 mm is heated from 15c to 40c and it is free to expand. The bar will induce
- A.
No stress
- B.
Shear stress
- C.
Tensile stress
- D.
Compressive stress
Correct Answer
A. No stress -
- 2.
The stress-induced in a body, when suddenly loaded, is __________ the stress-induced when the same load is applied gradually.
- A.
Equal to
- B.
One-half
- C.
Twice
- D.
Four times
Correct Answer
C. Twice -
- 3.
The deformation per unit length is called:
- A.
Tensile stress
- B.
Compressive stress
- C.
Shear stress
- D.
Strain
Correct Answer
D. Strain -
- 4.
Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is
- A.
1/8
- B.
1/4
- C.
1/2
- D.
2
Correct Answer
C. 1/2 -
- 5.
When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the:
- A.
Top layer
- B.
Bottom layer
- C.
Neutral axis
- D.
Every cross-section
Correct Answer
B. Bottom layer -
- 6.
The friction experienced by a body, when in motion, is known as:
- A.
Rolling friction
- B.
Dynamic friction
- C.
Limiting friction
- D.
Static friction
Correct Answer
B. Dynamic friction -
- 7.
If the resultant of two equal forces have the same magnitude as either of the forces, then the angle between the two forces is:
- A.
60°
- B.
90°
- C.
120°
- D.
Either A or C
Correct Answer
D. Either A or C -
- 8.
The unit of angular acceleration is:
- A.
N-m
- B.
M/s
- C.
M/s2
- D.
Rad/s2
Correct Answer
D. Rad/s2 -
- 9.
Work done is said to be zero, when
- A.
Some force acts on a body, but displacement is zero
- B.
No force acts on a body but some displacement takes place
- C.
Both (A) & (B)
- D.
None of the above
Correct Answer
C. Both (A) & (B) -
- 10.
If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be:
- A.
Same
- B.
Half
- C.
Double
- D.
None of the above
Correct Answer
B. Half -
- 11.
Geometric primitives include shapes such as ________.
- A.
Boxes
- B.
Cylinders
- C.
Wedges
- D.
All of the above
Correct Answer
D. All of the above -
- 12.
This is the term for the range of tightness or looseness resulting from the allowances and tolerances in mating parts:
- A.
Limits
- B.
Fit
- C.
Specifications
- D.
Allowance
Correct Answer
B. Fit -
- 13.
This means that a feature of a finished product contains the maximum amount of material permitted by the toleranced dimensions for that feature:
- A.
Maximum material condition
- B.
Machined material condition
- C.
Maximum machined indication
- D.
Machine mark indication
Correct Answer
A. Maximum material condition -
- 14.
A cylinder can be created by drawing a rectangular shape than the ________ tool.
- A.
Revolve
- B.
Sweep
- C.
Extrude
- D.
None of the above
Correct Answer
A. Revolve -
- 15.
CAD programs that incorporate parametric modeling utilize a system in which the dimensions control the ________.
- A.
Size and shape of the model features
- B.
Perspective of the model
- C.
Shading used to render the model
- D.
All of the above
Correct Answer
A. Size and shape of the model features -
- 16.
In one dimensional flow, the flow
- A.
Is steady and uniform
- B.
Takes place in straight line
- C.
Takes place in curve
- D.
Takes place in one direction
Correct Answer
B. Takes place in straight line -
- 17.
Euler's equation in the differential form for the motion of liquids is given by
- A.
Dp/p + g.dz + v.dv = 0
- B.
Dp/p - g.dz + v.dv = 0
- C.
ρ.dp + g.dz + v.dv = 0
- D.
ρ.dp - g.dz + v.dv = 0
Correct Answer
A. Dp/p + g.dz + v.dv = 0 -
- 18.
According to equation of continuity,
- A.
W1a1 = w2a2
- B.
W1v1 = w2v2
- C.
A1v1 = a2v2
- D.
A1/v1 = a2/v2
Correct Answer
C. A1v1 = a2v2 -
- 19.
The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)
- A.
1/RN
- B.
4/RN
- C.
16/RN
- D.
64/RN
Correct Answer
C. 16/RN -
- 20.
The pressure less than atmospheric pressure is known as
- A.
Suction pressure
- B.
Vacuum pressure
- C.
Negative gauge pressure
- D.
All of these
Correct Answer
B. Vacuum pressure -
- 21.
Which of the following statement is wrong?
- A.
The heat transfer in liquid and gases takes place according to convection.
- B.
The amount of heat flow through a body is dependent upon the material of the body.
- C.
The thermal conductivity of solid metals increases with rise in temperature.
- D.
Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference.
Correct Answer
C. The thermal conductivity of solid metals increases with rise in temperature. -
- 22.
In a refrigerating machine, heat rejected is __________ heat absorbed.
- A.
Equal to
- B.
Less than
- C.
Greater than
- D.
Two times
Correct Answer
C. Greater than -
- 23.
The amount of radiation mainly depends upon the
- A.
Nature of the body
- B.
Temperature of the body
- C.
Type of surface of the body
- D.
All of these
Correct Answer
D. All of these -
- 24.
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is
- A.
Equal to one
- B.
Greater than one
- C.
Less than one
- D.
Equal to Nusselt number
Correct Answer
A. Equal to one -
- 25.
The subcooling in a refrigeration cycle
- A.
Does not alter C.O.P.
- B.
Increases C.O.P.
- C.
Decreases C.O.P.
- D.
None of these
Correct Answer
B. Increases C.O.P. -
- 26.
The hardness of steel increases if it contains
- A.
Pearlite
- B.
Ferrite
- C.
Cementite
- D.
Martensite
Correct Answer
C. Cementite -
- 27.
The heat treatment process used for softening hardened steel is
- A.
Carburising
- B.
Normalising
- C.
Annealing
- D.
Tempering
Correct Answer
C. Annealing -
- 28.
Cast iron is a
- A.
Ductile material
- B.
Malleable material
- C.
Brittle material
- D.
Tough material
Correct Answer
C. Brittle material -
- 29.
The ability of a material to absorb energy in the plastic range is called
- A.
Resilience
- B.
Creep
- C.
Fatigue strength
- D.
Toughness
Correct Answer
A. Resilience -
- 30.
A small percentage of boron is added to steel in order to
- A.
Increase hardenability
- B.
Reduce machinability
- C.
Increase wear resistance
- D.
Increase endurance strength
Correct Answer
A. Increase hardenability -
- 31.
Any part or sub-assembly within an assembly.
- A.
Point
- B.
Model
- C.
Document
- D.
Component
Correct Answer
D. Component -
- 32.
A document in which parts, features, and other assemblies (sub-assemblies) are mated together.
- A.
Shell
- B.
Assembly
- C.
Model
- D.
Base
Correct Answer
B. Assembly -
- 33.
This creates a base, boss, cut, or surface feature by moving a profile (section) along a path
- A.
Shell
- B.
Line
- C.
Sweep
- D.
Base
Correct Answer
C. Sweep -
- 34.
The 3D solid geometry in a part or assembly document.
- A.
Line
- B.
Model
- C.
Base
- D.
Mate
Correct Answer
B. Model -
- 35.
The first solid feature of a part.
- A.
Boss
- B.
Base
- C.
Mate
- D.
Line
Correct Answer
B. Base -
- 36.
This typically includes page size and orientation, standard text, borders, title blocks, and so on
- A.
Sweep
- B.
Sheet format
- C.
Feature
- D.
Chamfer
Correct Answer
B. Sheet format -
- 37.
This feature bevels a selected edge or vertex.
- A.
Chamfer
- B.
Base
- C.
Pattern
- D.
Plane
Correct Answer
A. Chamfer -
- 38.
A geometric constraint between sketch entities or between a sketch entity and a plane, axis, edge, or vertex.
- A.
Mate
- B.
Feature
- C.
Relation
- D.
Rebuild
Correct Answer
C. Relation -
- 39.
A ________ feature is a copy of a selected feature, mirrored about a plane or planar face.
- A.
Mate
- B.
Mirror
- C.
Part
- D.
Vertex
Correct Answer
B. Mirror -
- 40.
A sketch or sketch entity with no exposed endpoints; for example, a circle or polygon.
- A.
Closed counter
- B.
Component
- C.
Open counter
- D.
Document
Correct Answer
A. Closed counter -
- 41.
Vertex → A geometric relationship, such as coincident, perpendicular, tangent, and so on, between parts in an assembly.
- A.
True
- B.
False
Correct Answer
B. False -
- 42.
Assembly → A feature tool that hollows out a part, leaving open the selected faces and thin walls on the remaining faces.
- A.
True
- B.
False
Correct Answer
B. False -
- 43.
Relation → A geometric constraint between sketch entities or between a sketch entity and a plane, axis, edge, or vertex.
- A.
True
- B.
False
Correct Answer
A. True -
- 44.
Line → Flat construction geometry.
- A.
True
- B.
False
Correct Answer
A. True -
- 45.
Chamfer → This repeats selected sketch entities, features, or components in an array, which can be linear, circular, or sketch-driven.
- A.
True
- B.
False
Correct Answer
B. False -
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Current Version
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Mar 21, 2022Quiz Edited by
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Mar 04, 2014Quiz Created by
D_gupta
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