UPSC Question-Paper Contributed by Vikas agarwal updated on Oct 2020
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1. The depth of critical N.A. of the beam is 

(m.d) / r

(m + r) / d

(m x d) / (m + r)

none of these
The answer is (m x d) / (m + r)

.
2. Minimum spacing between horizontal parallel reinforcement of the same size should not be less than _____ diameters 

4

3

2

1
The answer is 2

.
3. The maximum span to depth ratio of a simply supported slab spanning in both direction is _____ 

25

30

35

50

.The answer is 35

4. The purpose of ribbed slab is to provide 

Thermal insulation

Acoustic insulation

A plain ceiling

All of the above

.The answer is All of the above

5. In rectangular water tanks, maximum B.M. occurs when depth of water in the tank is equal to _____ the length of short wall 

1/4

1/2

3/4

1/5

.The answer is 1/2

6. Rapid hardening cement is actually early _____ cement 

setting

strength

hardening

curing

.The answer is setting

7. The relation between tread I and rise R in cms is given by 

4 + 2t = 30

2t + r = 30

2r + t = 60

2r + t = 30

.The answer is 2r + t = 60

8. Ductility of steel decreases with a percentage _____ of carbon steel 

decrease

increase

improvement

reduction

.The answer is increase
9. _____ ratio of steel, within elastic limit, varies from 0.25 to 0.33 

Compression

Extension

Impact

Poisson's
The answer is Poisson's

.
10. If unsupported length of a stanchion is 5 m, slenderness ratio is 100, the least radius of gyration of the cross-section is _____ cm 

50

60

10

5
The answer is 5
.
11. The process of adding extra carbon to the surface of steel is known as _____ 

Heat treatement

Carbon coating

Carburising

Carbon treatement

The answer is Carbon treatement.

12. Hardening of metal is due to heating to a particular temperature and followed by rapid cooling in a _____ media 

Cooling

Tempering

Quenching

Freezing
The answer is Quenching
.
13. Maximum shear force occurs at the edge of a base plate in a _____ footing 

Stepped

Rectangular

Square

Grillage

.The answer is Rectangular

14. The slenderness ratio of a tension member should not exceed 350, if the member is subjected to _____ stresses resulting from wind force 

Compressive

Tensile

Bending

Reversible

.The answer is Reversible

15. 0.67 is the effective length of a compression member _____ 

Fixed at both ends

Free at both ends

Held in position and restrain in direction at both ends

Fixed at both lower end and free at upper end

.The answer is Held in position and restrain in direction at both ends

16. L/2 is the effective length of a column, fixed in _____ at its top and bottom 

position

direction

position & direction

none of these

.The answer is position & direction

17. 27t is the strength of ISA 155 x 75 x 10 used as a tie member with the longer leg connected at the ends by a _____ mm dia rivet 

22

25

27

32
The answer is 27
.
18. The maximum deflection allowed in steel ties is 

L/750

L/480

L/350

unlimited
The answer is L/350
.
19. The angle of inclination of lacing bars in steel ties should be more than 

25

40

60

75

.The answer is 25

20. For normal loading conditions on a simply supported beam the breadth of the beam can be assumed as nearly 

1/12 of span of the beam

1/16 of span of the beam

1/24 of span of the beam

1/30 of span of the beam

.The answer is 1/30 of span of the beam

21. When a beam section spans over several supports continuously then the beam at supports should be designed as 

Singly reinforced beam

Doubly reinforced beam

Pre-stressed beam

Pre-cast beam
The answer is Doubly reinforced beam
.
22. In a continuous slab the B.M. at middle of interior spans due to super imposed load of intensity W Kg/m run will be 

Wl^2 / 12

Wl^2 / 10

Wl^2 / 24

Wl^2 / 9

.The answer is Wl^2 / 12

23. As per IS : 456 in a two-way slab, the width of the middle strip along each span should be 

3/8 of the width of span in that direction

3/8 of the width of span at right angles

3/4 of the shortest side of the slab

3/4 of width of the span in that direction
The answer is 3/4 of width of the span in that direction

.
24. The reinforcement provided in the form of ties or stirrups or binders in a column is known as 

longitudinal reinforcement

transverse reinforcement

temperature reinforcement

distributary reinforcement

.The answer is transverse reinforcement

25. Load carrying capacity of long columns are less as compared to short columns due to 

buckling effect of columns

crippling effects of columns

bending effects of columns

twisting effect of columns
The answer is buckling effect of columns
.
26. As per IS : 456 the thickness of footing edge on soils should not be less than 

10 cm

12 cm

15 cm

20 cm

.The answer is 15 cm

27. Generally for piles the concrete used is of the grade 

M100

M150

M200

M300
The answer is M200
.
28. The shear force on a beam and the displacement are related by 

V = El. d^2 y / dx^2

V = El. d^3 y / dx^3

V = El. d^4 y / dx^4

no relation at all

The answer is V = El. d^3 y / dx^3

29. The shear stress in a beam is zero 

At the centroid of the section

On the extreme free surface fibers

At the neutral axis but not at the centroid

At the free edges

.The answer is On the extreme free surface fibers

30. The minimum strength of concrete that can be used in the foundations of RCC water tanks of 450 mm thick is about 

M15

M20

M25

M10

.The answer is M15

31. The carbon content in steel does not exceed 

0.5%

1.0%

1.5%

2.0%
The answer is 2.0%

32 A streamline and an equipotential line in a flow field 
(A) Are parallel to each other 
(B) Are perpendicular to each other 
(C) Intersect at an acute angle 
(D) Are identical 
Answer: - (B) 
Explanation:-
dy/dx* dy/dx=-1

Slope of equipotential Line × slope of stream function= -1 
They are orthogonal to each line other.

33 If a mass of moist air in an airtight vessel is heated to a higher temperature, 
then 
(A) Specific humidity of the air increases 
(B) Specific humidity of the air decreases 
(C) Relative humidity of the air increases 
(D) Relative humidity of the air decreases 
Answer: - (D) 
Explanation:- R.H. Decreases
Image


34 . In a condenser of a power plant, the steam condenses at a temperature of 0 60 C . The cooling water enters at 0 0 C and leaves at 0 45 C . The logarithmic ean temperature difference (LMTD) of the condenser is 
(A) 016.2 C 
(B) 0 21.6 C 
(C) 030 C 
(D) 0 37.5 C
Answer: - (B) 
Explanation: - Flow configuration in condenser as shown below.


35 . The maximum possible draft in cold rolling of sheet increases with the 
(A) Increase in coefficient of friction 
(B) Decrease in coefficient of friction 
(C) Decrease in roll radius 
(D) Increase in roll velocity 
Answer: - (A) 

36 . The operation in which oil is permeated into the pores of a powder metallurgy product is known as 
(A) Mixing 
(B) Sintering 
(C) Impregnation 
(D) Infiltration 
Answer: - (C) 

37 . A hole is dimension 0.01509++φ mm. The corresponding shaft is of dimension 0.0100.0019++ φ mm. The resulting assembly has 
(A) Loose running fit 
(B) Close running fit 
(C) Transition fit 
D) Interference fit 
Answer: - (C) 
P Q
P Q
1 kN m−
1m

3
38 . Heat and work are 
(A) Intensive properties 
(B) Extensive properties 
(C) Point functions 
(D) Path functions 
Answer: - (D) 

Explanation: - Heat and work are path functions. 
Since δQ and δW are dependent on path followed between two given end states of a thermodynamic process undergone by system. 

39 . A column has a rectangular cross-section of 10mm x 20mm and a length of 1m. The slenderness ratio of the column is close to 
(A) 200 
(B) 346 
(C) 477 
(D) 1000 
Answer: - (B)
I

40 . Green sand mould indicates that 
(A) Polymeric mould has been cured 
(B) Mould has been totally dried 
(C) Mould is green in colour 
(D) Mould contains moisture 
Answer: - (D) 


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