81) Recycled Concrete Aggregate (RCA) when compared to natural aggregate, typically has which of the following characteristics?
- Lower water absorption and higher density
- Higher water absorption, lower density and higher crushing value
- Same mechanical properties as natural aggregate
- Better resistance to alkali-silica reaction
82) The ‘4E’ framework commonly used in road safety management stands for
- Engineering, Enforcement, Education, Emergency care
- Economics, Engineering, Environment, Execution
- Elevation, Earthwork, Environment, Execution
- Education, Evaluation, Enforcement, Economics
83) As per MoRTH specifications, the minimum content of waste plastic required in plastic-modified bituminous concrete (DBM/BC) is approximately
- 0.02% by weight of bitumen
- 5% by weight of aggregate
- 5% by weight of bitumen
- 10% by weight of total mix
84) Consider the following road safety infrastructure elements:
- Median barriers prevent head-on collisions on high-speed roads
- Guardrails (crash barriers) are provided on curves and embankment sections
- Road lighting significantly increases night-time accident rates
- Pedestrian subways/FOBs (Foot Over Bridges) reduce pedestrian-vehicle conflicts
Select the correct statements.
- 1 and 4 only
- 1, 3 and 4 only
- 1, 2 and 4 only
- 1, 2, 3 and 4
85) Under the Motor Vehicles (Amendment) Act, 2019, which of the following new provisions was introduced to improve road safety in India?
- Lifetime ban on driving for first-time offenders
- Complete prohibition on two-wheelers on highways
- Mandatory retirement of all vehicles over 5 years
- Significant increase in penalties for traffic violations and electronic enforcement
86) Recycled aggregates used in flexible pavement construction (sub-base layer) should conform to which of the following quality requirements as per MoRTH Specifications (5th Revision)?
- CBR value not less than 30% and plasticity index less than 6
- CBR value not less than 20% and no plasticity requirement
- CBR value not less than 50% for all layers
- No specific requirements for recycled aggregates in roads
87) Consider the following statements about ‘Green Building’ certification in India:
- GRIHA (Green Rating for Integrated Habitat Assessment) is developed by TERI and adopted by the Government of India.
- LEED (Leadership in Energy and Environmental Design) certification is administered by the Indian Green Building Council (IGBC).
- GRIHA awards points based on site selection, energy efficiency, water conservation, and waste management.
Which of the above statements are correct?
- 1 and 2 only
- 1 and 3 only
- 2 and 3 only
- 1, 2 and 3
88) ‘3D Concrete Printing’ (3DCP) technology in construction primarily offers which of the following advantages?
- Requires higher amounts of conventional steel reinforcement
- Is limited to decorative elements only
- Increases cost due to expensive raw materials
- Eliminates need for traditional formwork and speeds up construction
89) Which of the following statements is the correct definition of ‘Smart City’ as per the Smart Cities Mission of India?
- A city with 100% electrification and internet connectivity
- A city that applies data-driven solutions to make services more efficient, inclusive and sustainable, improving the quality of life for citizens
- A city with only high-rise buildings and metro rail
- A city with a population of over 10 lakhs
90) ‘Structural Health Monitoring’ (SHM) systems installed on bridges and buildings primarily use which of the following technologies?
- Visual inspection by engineers annually
- X-ray scanning of structural elements
- Embedded/surface-mounted sensors
- Regular destructive testing of material samples
