GATE Environmental Engineering General Aptitude Syllabus

In vocabulary, what is the difference between a synonym and an antonym?

A synonym is a word with the same or nearly the same meaning as another (happy/joyful), while an antonym is a word with the opposite meaning (happy/sad).

What is a homophone? Give an example.

A homophone is one of two or more words pronounced alike but differing in meaning and usually spelling, e.g., 'their', 'there', and 'they're', or 'to', 'too', and 'two'.

Distinguish the commonly confused words 'affect' and 'effect'.

'Affect' is usually a verb meaning to influence (Pollution affects health). 'Effect' is usually a noun meaning the result (The effect of pollution).

Distinguish the words 'principal' and 'principle'.

'Principal' means chief/main or the head of a school (also a sum of money). 'Principle' is a noun meaning a fundamental rule, law, or belief.

What is the strategy of 'narrative sequencing' (parajumbles) in aptitude tests?

It involves arranging a set of jumbled sentences into a logical, coherent order by identifying the opening sentence, using linking words, pronoun references, and chronological/logical cues.

In a reading comprehension passage, what is the difference between the 'main idea' and a 'supporting detail'?

The main idea is the central point or overall message the author conveys, while supporting details are facts, examples, or reasons that develop and reinforce that main idea.

What does it mean to infer information in reading comprehension?

Inference means drawing a logical conclusion that is implied but not directly stated in the text, based on the available evidence and clues within the passage.

What is data interpretation (DI) in the General Aptitude section?

Data interpretation is the skill of reading, analyzing, and drawing conclusions from data presented in forms such as tables, bar graphs, pie charts, and line graphs to answer quantitative questions.

What does a bar graph represent, and when is it best used?

A bar graph uses rectangular bars of lengths proportional to values to represent data. It is best used for comparing discrete categories or showing changes over time.

What does a pie chart represent, and what does the whole circle equal?

A pie chart represents parts of a whole as sectors of a circle, showing proportions or percentages. The entire circle equals $360^{\circ}$, corresponding to $100\%$ of the data.

In a pie chart, what formula converts a category's percentage share into the central angle of its sector?

$$\text{Angle} = \frac{\text{Value of category}}{\text{Total value}} \times 360^{\circ}$$

In a pie chart, if a sector's central angle is $90^{\circ}$, what percentage of the total does it represent?

$\frac{90}{360} \times 100\% = 25\%$ of the total.

What is a line graph (or line plot) most suitable for displaying?

A line graph displays data points connected by line segments and is most suitable for showing trends or continuous changes in a variable over time.

What is the formula for percentage change between an old value and a new value?

$$\text{Percentage change} = \frac{\text{New value} - \text{Old value}}{\text{Old value}} \times 100\%$$

In data interpretation, how do you compute the average (arithmetic mean) of $n$ data values?

$$\bar{x} = \frac{1}{n}\sum_{i=1}^{n} x_{i} = \frac{x_{1} + x_{2} + \cdots + x_{n}}{n}$$

How do you express one quantity as a percentage of another?

$$\text{Percentage} = \frac{\text{Part}}{\text{Whole}} \times 100\%$$

What is a histogram, and how does it differ from a bar graph?

A histogram displays the frequency distribution of continuous, grouped numerical data using adjacent bars with no gaps. A bar graph compares discrete categories and has gaps between bars.

In a 2-dimensional Cartesian plot, what do the abscissa and ordinate refer to?

The abscissa is the x-coordinate (horizontal distance) and the ordinate is the y-coordinate (vertical distance) of a point, written as the ordered pair $(x, y)$.

What is a scatter plot used to show?

A scatter plot displays individual data points on two axes to reveal the relationship, correlation, or pattern between two variables.

In data interpretation, what is the ratio of two quantities and how is it expressed?

A ratio compares two quantities of the same kind by division, expressed as $a:b$ or $\frac{a}{b}$, indicating how many times one value contains the other.

What additional dimension does a 3-dimensional plot show compared with a 2-D plot, and how are points represented?

A 3-D plot adds a depth axis (z-axis) so points are located in space using three coordinates $(x, y, z)$, allowing visualization of a variable as a function of two independent variables.

In a data table, what are rows and columns used to organize?

In a table, data is arranged in a grid where rows run horizontally and columns run vertically; the intersection of a row and column gives a specific data value, enabling quick lookup and comparison.

On a map, what does the 'scale' represent?

A map scale shows the ratio between a distance on the map and the corresponding actual distance on the ground, e.g., $1:50{,}000$ means $1$ cm on the map equals $50{,}000$ cm (or $0.5$ km) in reality.

If a pie chart total is 720 students and the 'Engineering' sector is $35\%$, how many students study Engineering?

$0.35 \times 720 = 252$ students.

What is the difference between a phrase used 'literally' and 'in context' (figuratively)?

A literal use takes the words at their exact dictionary meaning, while a contextual/figurative use derives meaning from the surrounding situation, often differing from the literal sense (e.g., 'break the ice').

What is a gerund, and how does it function in a sentence?

A gerund is the '-ing' form of a verb that functions as a noun, e.g., 'Swimming is healthy' where 'swimming' acts as the subject.

What does the idiom 'once in a blue moon' mean?

It means very rarely or almost never.

In subject-verb agreement, what verb form do collective nouns and 'indefinite pronouns' like 'everyone' or 'each' take?

Indefinite pronouns such as 'everyone', 'each', 'everybody', and 'nobody' are treated as singular and take a singular verb (e.g., 'Everyone is ready'). Collective nouns usually take a singular verb when acting as one unit.

What is the value of finding the 'tone' of a passage in reading comprehension?

Identifying the tone reveals the author's attitude or emotion toward the subject (e.g., critical, optimistic, sarcastic, neutral), which aids in correctly interpreting meaning and answering inference questions.

If sales rise from 200 units to 250 units, what is the percentage increase?

$\frac{250 - 200}{200} \times 100\% = \frac{50}{200} \times 100\% = 25\%$.