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Model Questions for SSC Junior Engineer EXAM - Mechanical Engg Set-3

1. When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the

A. every cross-section
B. bottom layer
C. neutral axis
D. top layer

2. The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.

A. one-half
B. twice
C. equal to
D. four times

3. A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce

A. compressive stress
B. shear stress
C. tensile stress
D. no stress

4. The deformation per unit length is called

A. shear stress
B. strain
C. compressive stress
D. tensile stress

5. The point of contraflexure is a point where

A. shear force is maximum
B. bending moment is maximum
C. bending moment changes sign
D. shear force changes sign

Study Kit for SSC Junior Engineer EXAM (Paper-1) 2017-2018

6. A masonry dam may fail due to

A. crushing of masonry at the base of the dam
B. tension in the masonry of the dam and its base
C. any one of the above
D. overturning of the dam

7. The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)

A. 4t
B. 8t
C. t
D. 2t

8. If the slenderness ratio for a column is 100, then it is said to be a __________ column.

A. medium
B. short
C. long
D. NONE OF THESE

9. Strain resetters are used to

A. measure shear strain
B. measure linear strain
C. measure volumetric strain
D. relieve strain

10. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be

A. 900 MPa
B. 1400 MPa
C. 500 MPa
D. 400 MPa