Part X — Practice

Chapter 10: Mixed Practice Set — All Technical Topics (50 MCQs)

This chapter mixes questions from every technical chapter in this book, in exam-realistic random order, to simulate how RRB JE CBT 2 Technical Abilities questions are typically distributed.

1. Ordinary Portland Cement is manufactured by heating limestone and clay to approximately:
   (a) 900°C (b) 1450°C (c) 2000°C (d) 500°C
2. Which Bogue's compound contributes most to early strength gain in cement?
   (a) C3S (b) C2S (c) C3A (d) C4AF
3. The nominal size of a standard modular brick in India is:
   (a) 190mm × 90mm × 90mm (b) 200mm × 100mm × 100mm (c) 230mm × 110mm × 75mm (d) 250mm × 120mm × 80mm
4. A Gunter's chain has a standard length of:
   (a) 20 m (b) 30 m (c) 66 feet (20.12 m) (d) 100 feet
5. The angle between true north and magnetic north is called:
   (a) Magnetic declination (b) Bearing angle (c) Azimuth (d) Whole circle bearing
6. Backsight (BS) in levelling refers to:
   (a) The last staff reading from an instrument station (b) The first staff reading, typically on a point of known elevation (c) A horizontal angle (d) A type of bench mark
7. In "M25" concrete, the number 25 refers to:
   (a) Cement content in kg/m³ (b) Characteristic compressive strength in N/mm² at 28 days (c) Water-cement ratio (d) Age in days
8. The Slump Test measures:
   (a) Compressive strength (b) Workability of fresh concrete (c) Setting time (d) Fineness of aggregate
9. As per the Indian Standard Soil Classification System, particles larger than 4.75mm are:
   (a) Sand (b) Silt (c) Gravel (d) Clay
10. The Plasticity Index (PI) is calculated as:
    (a) LL + PL (b) LL − PL (c) LL × PL (d) LL / PL
11. Darcy's Law, governing flow through soil, is expressed as:
    (a) v = k·i (b) v = k/i (c) v = k + i (d) v = k − i
12. The standard density of water is approximately:
    (a) 100 kg/m³ (b) 500 kg/m³ (c) 1000 kg/m³ (d) 2000 kg/m³
13. Bernoulli's Theorem states that pressure head, velocity head, and elevation head sum to a value that is:
    (a) Zero (b) Constant along a streamline (c) Always increasing (d) Dependent only on pipe material
14. Which irrigation method is generally the most water-efficient?
    (a) Flood irrigation (b) Furrow irrigation (c) Drip irrigation (d) Border irrigation
15. Hooke's Law states that, within the elastic limit, stress is:
    (a) Inversely proportional to strain (b) Directly proportional to strain (c) Independent of strain (d) Always zero
16. The Modulus of Elasticity of steel is approximately:
    (a) 2×10⁵ N/mm² (b) 2×10³ N/mm² (c) 2×10⁷ N/mm² (d) 25–35 GPa
17. For a simply supported beam of span L with a central point load W, the maximum bending moment is:
    (a) WL/2 (b) WL/4 (c) wL²/8 (d) WL
18. A truss member is designed to carry load primarily as:
    (a) Bending moment (b) Axial (tension/compression) force (c) Shear force only (d) Torsion
19. The standard/broad gauge used in Indian Railways is:
    (a) 1000 mm (b) 1435 mm (c) 1676 mm (d) 610 mm
20. Camber on a road surface is primarily provided to:
    (a) Increase speed limits (b) Facilitate drainage (c) Reduce cost (d) Increase load capacity
21. Superelevation on a curved road counteracts:
    (a) Gravity alone (b) Centrifugal force (c) Wind load (d) Seismic force
22. BOD is conventionally measured over a standard period of:
    (a) 1 day at 20°C (b) 5 days at 20°C (c) 10 days at 20°C (d) 30 days at 20°C
23. Ozone layer depletion is primarily caused by:
    (a) Carbon dioxide (b) Chlorofluorocarbons (CFCs) (c) Sulphur dioxide (d) Methane
24. Acid rain results primarily from which pollutants?
    (a) Carbon dioxide and methane (b) Sulphur dioxide and nitrogen oxides (c) CFCs alone (d) Particulate matter alone
25. Fine aggregate is defined as aggregate that:
    (a) Is retained on the 4.75 mm IS sieve (b) Passes the 4.75 mm IS sieve (c) Passes the 20 mm IS sieve only (d) Is retained on the 10 mm IS sieve
26. Bulking of sand is typically maximum at approximately what moisture content?
    (a) 1–2% (b) 5–8% (c) 15–20% (d) 25–30%
27. A prismatic compass is primarily used to measure:
    (a) Vertical angles (b) Bearings of survey lines (c) Elevations (d) Distances directly
28. A theodolite is primarily used to measure:
    (a) Only linear distances (b) Both horizontal and vertical angles (c) Only elevation differences (d) Only magnetic bearings
29. Curing of concrete is primarily performed to:
    (a) Increase cement content (b) Maintain adequate moisture/temperature for hydration (c) Reduce reinforcement needed (d) Speed formwork removal
30. Clear cover in RCC members primarily protects reinforcement from:
    (a) Excessive strength gain (b) Corrosion and fire (c) Workability loss (d) Setting time changes
31. Optimum Moisture Content (OMC) refers to the moisture content at which:
    (a) Maximum Dry Density is achieved for a given compactive effort (b) Minimum dry density is achieved (c) Full saturation occurs (d) Permeability is highest
32. Terzaghi's theory is primarily used to estimate:
    (a) Permeability (b) Bearing capacity of soil (c) Plasticity index (d) Optimum moisture content
33. A Venturimeter measures flow rate based on:
    (a) A pressure difference from a gradual constriction (Bernoulli's principle) (b) Magnetic field changes (c) Sound wave reflection (d) Direct weight measurement
34. A barrage, compared to a plain weir, allows:
    (a) Less control (b) More controlled regulation via gates (c) No diversion (d) Only groundwater recharge
35. For a cantilever of length L with a point load W at the free end, the maximum bending moment occurs at:
    (a) The free end, zero (b) The fixed support, magnitude WL (c) The midpoint (d) The free end, magnitude WL
36. The Method of Sections in truss analysis is particularly useful for:
    (a) Finding forces in specific members directly (b) Finding total weight only (c) Determining modulus of elasticity (d) Measuring deflection only
37. Flexible pavements distribute load primarily through:
    (a) Slab/flexural action (b) A layered granular structure (c) Suspension cables (d) Arch action
38. Rigid pavements distribute load primarily through:
    (a) A layered granular structure (b) Slab action/flexural strength (c) Suspension cables (d) Arch action
39. Railway sleepers primarily function to:
    (a) Generate electricity (b) Maintain gauge and transfer load to ballast (c) Provide drainage only (d) Replace ballast
40. A culvert is generally defined as a structure with a span:
    (a) Under approximately 6m (b) Over 100m (c) Exactly 50m (d) Used only for railway crossings
41. Arch bridges carry loads primarily through:
    (a) Tension (b) Compression through the arch shape (c) Torsion (d) Bending only
42. Suspension bridges suspend the deck from:
    (a) Main cables anchored at towers (b) A rigid concrete slab (c) The riverbed directly (d) Timber trestles
43. CPHEEO manual guidelines standardise:
    (a) Highway pavement thickness (b) Per-capita water demand estimates (lpcd) (c) Railway gauge width (d) Concrete mix grades
44. Chemical Oxygen Demand (COD), compared to BOD for the same sample, is generally:
    (a) Lower than BOD (b) Higher than BOD (c) Always exactly equal (d) Unrelated
45. RRB JE examinations apply negative marking of:
    (a) 1/4 mark (b) 1/3 mark (c) 1/2 mark (d) No negative marking
46. CBT 1 in RRB JE recruitment is:
    (a) Common for all disciplines, used for shortlisting (b) Discipline-specific and directly determines merit (c) Optional (d) Only for Civil Engineering
47. The Technical Abilities section in RRB JE CBT 2 for Civil Engineering typically carries how many marks?
    (a) 50 (b) 75 (c) 100 (d) 120
48. Portland Pozzolana Cement (PPC) is particularly preferred for:
    (a) Mass concreting and marine structures (b) High early-strength precast elements (c) Cold-weather concreting exclusively (d) Decorative plastering
49. Which soil type generally has the lowest permeability?
    (a) Gravel (b) Sand (c) Clay (d) Coarse gravel
50. A fixed (built-in) beam, compared to a simply supported beam:
    (a) Cannot resist any moment at supports (b) Rigidly resists moment at both supports (c) Has no supports (d) Can only carry point loads

Answer Key

1.(b)

2.(a)

3.(a)

4.(c)

5.(a)

6.(b)

7.(b)

8.(b)

9.(c)

10.(b)

11.(a)

12.(c)

13.(b)

14.(c)

15.(b)

16.(a)

17.(b)

18.(b)

19.(c)

20.(b)

21.(b)

22.(b)

23.(b)

24.(b)

25.(b)

26.(b)

27.(b)

28.(b)

29.(b)

30.(b)

31.(a)

32.(b)

33.(a)

34.(b)

35.(b)

36.(a)

37.(b)

38.(b)

39.(b)

40.(a)

41.(b)

42.(a)

43.(b)

44.(b)

45.(b)

46.(a)

47.(c)

48.(a)

49.(c) 50.(b)