List of top Questions asked in GATE CE- 2025

Fecal Coliform (FC) concentration in river water was measured as 10708 cfu/100 ml. The FC concentration after the conventional water treatment, but before chlorination, was measured as 23 cfu/100 ml. The 'Log Kill' (inactivation) of FC due to the conventional water treatment is closest to:

A hydrocarbon \( C_n H_m \) is burnt in air (O\(_2\) + 3.78N\(_2\)). The stoichiometric fuel to air mass ratio for this process is 
Note: Atomic Weight: C(12), H(1) Effective Molecular Weight: Air(28.8)

All the vehicles that come during a particular peak hour come during a 10-minute period within this hour. The 15-minute peak hour factor for this peak hour is
In the context of testing bitumen, which one of the following statements is FALSE:
The maximum degree of the curve that can be used for railways in a mountainous region is
If the horizontal distance between a staff point and the point of observation is \( d \), the error due to the curvature of the earth is proportional to
If the quadrantal bearing of a line is N30°W, then the whole circle bearing of the line is
Which of the following equations belong/belongs to the class of second-order, linear, homogeneous partial differential equations?

Consider the frame shown in the figure under the loading of 100 kN.m couples at the joints B and G. Considering only the effects of flexural deformations, which of the following statements is/are true: 

For the Bernoulli's equation to be applicable in a fluid flow situation, which of the following conditions is/are to be satisfied:
The Surface Overflow Rate (SOR) in a rectangular sedimentation tank is 45 m\(^3\)/m\(^2\)·day. Minimum diameters of spherical inorganic and organic particles expected to be completely removed in this tank are calculated. Assume that Stoke’s law is applicable. Which of the following options is/are correct:
Aeration is employed as a treatment option for the removal of several pollutants from contaminated water. Identify the pollutant(s), where aeration is employed as part of their removal:
A water resources project with an expected life of 25 years has to be designed for an acceptable risk of 5% against a design flood. The return period for the design flood (in years) is ........... (rounded off to the nearest integer).
Road A and Road B are joined by a circular horizontal curve of radius 200 m as shown in the figure. Road A and Road B are tangential to the curve at the points C and D, respectively. Had the curve not been there, straight roads A and B would have met at the point E. The distance from C to E is 92 m. The value of angle \( \theta \) (in degrees) is ........... (rounded off to 1 decimal place).

The value of \[ \lim_{x \to \infty} \left( x - \sqrt{x^2 + x} \right) \] is equal to:

In the rigid-jointed frame shown in the figure, the distribution factor of the member AD is closest to 


 

In an oedometer apparatus a specimen of fully saturated clay has been consolidated under a vertical pressure of 100 kPa and is at equilibrium state. Immediately on increasing the vertical pressure to 150 kPa, the effective stress \( \sigma' \) and excess pore water pressure \( \Delta u \) will be

The mean rainfall over a catchment has to be estimated. The data for four rain gauges located in and around the catchment is listed in the table. Which one of the following statements is correct: 

The speed-density relation on a one-way, single lane road is shown in the figure, where speed \( u \) is in km/hour and density \( k \) is in vehicles/km. The maximum flow (in vehicles/hour) on this road is 

Consider the beam ACDEB given in the figure. Which of the following statements is/are correct: 

In the context of construction project management, which of the following statements is/are true:
Lacey’s regime equations, followed in India for making scour calculations while designing hydraulic structures across alluvial channels, are given below. Regarding these equations, which of the following statements is/are true:
MgCl$_2$ and CaSO$_4$ salts are added to 1 litre of distilled deionized water and mixed until completely dissolved. Total Dissolved Solids (TDS) concentration is 500 mg/l, and Total Hardness (TH) is 400 mg/l (as CaCO$_3$). The amounts of MgCl$_2$ and CaSO$_4$ added are calculated (rounded off to the nearest integer). Which of the following options is/are true:
A facultative pond system is employed for wastewater treatment. Which of the following statements is/are true:
Organic fraction of municipal solid waste (OFMSW) with bulk density of 315 kg/m$^3$ and water content of 30% is mixed with municipal sludge of bulk density 700 kg/m$^3$ and water content of 70%, such that the water content of the mixture is 40%. The amount (in kg) of sludge to be mixed per kg of OFMSW (rounded off to 2 decimal places) and the density of the mixture (in kg/m$^3$) (rounded off to the nearest integer) are calculated. Which of the following options is/are true: