2791. If and are external and internal diameters of a circular shaft respectively, its polar moment of inertia, is________________?
A. D4 – d4)
B. D4 – d4)
C. D4 – d4)
D. D4 – d4)
✅ The correct answer is option D.
Civil Engineering
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2792. Gradually applied static loads do not change with time their_______________?
A. Magnitude
B. Direction
C. Point of application
D. All the above
✅ The correct answer is option D.
2793. The ratio of the maximum deflections of a simply supported beam with a central load W and of a cantilever of same length and with a load W at its free end, is________________?
A. 1/8
B. 1/10
C. 1/12
D. 1/16
✅ The correct answer is option D.
2794. The ratio of shear stress and shear strain of an elastic material, is________________?
A. Modulus of Rigidity
B. Shear Modulus
C. Modulus of Elasticity
D. Both A. and B
✅ The correct answer is option D.
2795. Shear strain energy theory for the failure of a material at elastic limit, is due to_________________?
A. Rankine
B. Guest or Trecas
C. St. Venant
D. Von Mises
✅ The correct answer is option D.
2796. Which one of the following is considered to be an advantage of the heading and benching method of tunnel construction?
A. It is suitable for construction in unstable rocks
B. In this method, it is easy to install timber support
C. Tunnelling can be continuous and the work can be expedited
D. In case of excessive water, it is easy to take correct steps
✅ The correct answer is option C.
2797. Sunlight_________________ ?
A. helps growth of bacterias
B. impedes growth of algae
C. increases dissolved oxygen content
D. reduces turbidity
✅ The correct answer is option B.
2798. Assertion A : When rock conditions are favorable, it will not be necessary to take up concrete lining concurrently with the driving operations till the full length of the tunnel has been driven through rock. Reason R : A tunnel through rock, hard or soft, does not need any concrete lining________________?
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true
✅ The correct answer is option C.
2799. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is______________________?
A. 1880 kilo litres
B. 2880 kilo litres
C. 3880 kilo litres
D. 4880 kilo litres
✅ The correct answer is option B.
2800. Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?
A. stone masonry
B. timber
C. cast iron
D. cement concrete
✅ The correct answer is option C.