List of top Questions asked in GATE ES

Which ONE of the following options CORRECTLY matches the Criteria Air Pollutants with measurement methods used in Continuous Ambient Air Quality Monitoring Stations (CAAQMS) operated by Central Pollution Control Board (CPCB) given in the table?

Criteria Air Pollutants	Measurement Methods
(P) Sulphur Dioxide (SO2, in µg/m3)	(i) Chemiluminescence
(Q) Nitrogen Dioxide (NO2, in µg/m3)	(ii) Non Dispersive Infra Red (NDIR) spectroscopy
(R) Particulate Matter (PM2.5, in µg/m3)	(iii) Ultraviolet fluorescence
(S) Carbon Monoxide (CO, in mg/m3)	(iv) Beta attenuation

Which ONE of the following options CORRECTLY matches the atmospheric stability conditions with plume conditions/ behaviours given in the table?

Atmospheric Stability Conditions	Plume Conditions/Behaviours
(P) Strong instability	(i) Fanning plume
(Q) Neutral stability	(ii) Fumigation
(R) Surface inversion	(iii) Coning plume
(S) Aloft inversion	(iv) Looping plume

Consider the matrix \(A = \begin{bmatrix} 2 & 2 & 3 \\ 2 & 5 & 6 \\ 3 & 4 & 10 \end{bmatrix}\). Which ONE of the following options CORRECTLY lists the eigenvalues of \(A\)?

A first-order ordinary differential equation is given as follows: \[\frac{dy}{dx} + x^2 y = 0\] Which ONE of the following options CORRECTLY represents the characteristics of this equation?

A 6-hour rainfall of 6 cm at a station was found to have a return period of 40 years. The probability that a 6-hour rainfall of this or larger magnitude will occur at least once in 20 successive years at that station is ______ (rounded off to three decimal places).

Which of the following options is/are directly associated with the steps involved in carrying out life cycle assessment (LCA)?

Which of the following statements is/are CORRECT in the context of hazardous waste management and its risk assessment?

Which of the following statements is/are TRUE about global warming?

Water is flowing at the rate of 15 m³/s through a rectangular channel of 5 m width. If the acceleration due to gravity (g) is 9.81 m/s², the critical velocity for the flow is ______ m/s (rounded off to three decimal places).

Which of the following chemical reactions is/are related to smog formation in the troposphere?

Which of the following processes is/are primarily used to remove the organic matter in sludge?

Which ONE of the following options CORRECTLY matches the ISO series with their usages in environmental management system (EMS) given in the table?

ISO Series	Environmental Management System
(P) ISO 14001	(i) Environmental labeling
(Q) ISO 14020	(ii) Evaluation of environmental management system
(R) ISO 14040	(iii) Addressing environmental aspects of products
(S) ISO 14060	(iv) Life cycle assessment procedure

As per the United Nations General Assembly resolution adopted in 2015 "Transforming Our World: The 2030 Agenda for Sustainable Development", the number of sustainable development goals (SDGs) is ______.

Which of the following options is/are CORRECTLY listing the species included in Total Kjeldahl Nitrogen (TKN) estimation of an aqueous sample?

Which ONE of the following options CORRECTLY matches the processes associated with the growth condition given in the table?

Process	Growth Condition
(P) Activated sludge process	(i) Anaerobic suspended growth
(Q) Anaerobic filter	(ii) Anaerobic attached growth
(R) Trickling filter	(iii) Aerobic suspended growth
(S) Anaerobic digestion	(iv) Aerobic attached growth

Which ONE of the following principles is directly related to environmental compensation?

In the design of air pollution control devices, size of the particles that are removed with 50% efficiency is termed as ______.

A species whose impact on an ecosystem is disproportionately large in comparison to its population is called ______ species.

The general atmospheric composition of gases in the decreasing order is ______.

Which ONE of the following options is NOT a parameter as a part of proximate analysis of municipal solid waste?

Which ONE of the following options is the CORRECT formula for Chi-Square (\(\chi^2\)) test?
Given, \(O_1, O_2, \ldots, O_n\) are the observed values, \(E_1, E_2, \ldots, E_n\) are the corresponding expected values, \(\bar{O}\) is the mean of observed values, \(n\) is the number of observations, \(\mu\) is the mean of \(E_i, i = 1, \ldots, n\), \(\sigma_o\) is the standard deviation of observed values, and \(\sigma_E\) is the standard deviation of expected values \(E_i, i = 1, \ldots, n\).

Malaria is caused by pathogenic ______.

The major class of enzymes catalyzing the cleavage of \(C-C\), \(C-O\), \(C-N\), or other bonds by elimination, leaving double bonds or rings, or addition of groups to double bonds in any biochemical reactions is ______.

In the reversible reaction shown below, \(k_f\) is the forward reaction rate constant and \(k_r\) is the reverse reaction rate constant.
The CORRECT expression representing the reaction equilibrium constant is ______.
\[A + B \underset{k_r}{\overset{k_f}{\rightleftharpoons}} C + D\]