UGC NET Questions (Paper – 1)

A’s one-day work is 1/12 of the job and B’s one-day work is 1/20 of the job. The combined one-day work is therefore 1/12 + 1/20. Using the least common multiple of 12 and 20, which is 60, this becomes (5 + 3) / 60 = 8 / 60 = 2 / 15. The total time required is the reciprocal of 2 / 15, which is 15 / 2 or 7.5 days. Thus, together they will finish the work in 7.5 days.

Option A:
Option A, 6 days, is too small and would imply a higher combined rate than 2/15 per day. It suggests that the two workers together are even more efficient than the calculations show.

Option B:
Option B accurately reflects the reciprocal of the combined daily work fraction. It respects the principle that joint work rates add and that the total time is found by inverting the sum.

Option C:
Option C, 8 days, overestimates the time and corresponds to a smaller combined rate than the actual 2/15 of the work per day.

Option D:
Option D, 10 days, is even less efficient and ignores the substantial contribution B adds when working alongside A.

Statement D is the only wrong statement because altering data to fit expectations is a clear form of falsification and is strictly unethical. Statements A, B and C correctly define plagiarism, fabrication and falsification as forms of research misconduct. Statement E correctly notes that standard ethical codes explicitly prohibit all three practices. Therefore, D alone represents a view that contradicts accepted ethical standards.

Option A:
Option A is incorrect because it treats A together with D as wrong, even though A correctly defines plagiarism as misappropriation of others’ work. Since only D endorses unethical behaviour, grouping A with it misrepresents ethical principles.

Option B:
Option B wrongly suggests that both C and D are wrong. In reality, C accurately defines falsification as manipulative distortion of research procedures or data. This option therefore mislabels a correct statement as wrong.

Option C:
Option C is correct because it isolates D as the sole statement endorsing an unethical practice, namely altering data to match hypotheses. It implicitly affirms that A, B, C and E are in line with standard research ethics, which is consistent with accepted codes of conduct.

Option D:
Option D incorrectly includes B and E among the wrong statements. B correctly describes fabrication as making up data, and E correctly notes that guidelines forbid such behaviour. By treating these as wrong, the option conflicts with basic ethical definitions.

Option E misclassifies C and E as wrong along with D, even though both C and E accurately describe elements of research ethics and misconduct. This broad mislabelling shows conceptual confusion and renders the option unacceptable.

Statements A, B, C and E correctly explain how truth tables are used to test validity, while D and F are false. Validity is checked by looking for a counterexample row with true premises and false conclusion, and the absence of such a row shows validity. The number of rows indeed increases exponentially with the number of distinct simple propositions. D is wrong because truth tables work for any finite number of premises, and F is unrealistic about exam expectations, where simpler reasoning is usually sufficient.

Option A:
Option A is incomplete because it omits E, failing to mention the key fact that truth table size grows rapidly with the number of propositions. While A, B and C correctly describe the validity test, they do not fully address the structure of truth tables. Hence this option does not contain all the correct statements.

Option B:
Option B is correct since it brings together the procedural rules for testing validity and the structural observation about row growth, without adding the unrealistic or incorrect claims of D and F. It captures both conceptual understanding and practical awareness. Therefore this option is consistent with how truth tables are taught for UGC NET.

Option C:
Option C is wrong because it includes F, implying that students must always construct very large tables during the exam, which is not expected at Paper 1 level. It also omits C’s explicit statement of the condition for validity. This combination therefore misrepresents both difficulty and method.

Option D:
Option D is incorrect as it includes F and omits A, losing the basic explanation of how truth tables identify invalidity. With F present, it misleads students about exam requirements, and the absence of A leaves out the essential test for counterexamples. Thus B, C, E and F only cannot be the right answer.

A contradiction is a statement that cannot be true in any possible situation because its form guarantees falsity on every line of its truth table. It is logically inconsistent and unsatisfiable, meaning no assignment of truth values makes it hold. Such statements often arise from combining a claim and its negation. Therefore the statement described in the stem is accurately called a contradiction.

Option A:
Option A is correct because contradictions exhibit the extreme case of logical falsity: they are false in all possible worlds or under all valuations. Recognising contradictions is important in proofs by contradiction and in detecting inconsistent sets of premises.

Option B:
Option B, tautology, is the exact opposite: a statement that is true under every possible assignment of truth values. While it also has a uniform truth-value pattern, that pattern is truth rather than falsehood.

Option C:
Option C, contingency, is true under some assignments and false under others, which is the normal status of most factual claims. The stem, however, speaks of a statement that is false in every possible case.

Option D:
Option D, hypothesis, refers to a provisional assumption or conjecture and does not specify a particular truth-table pattern. A hypothesis could be a tautology, contradiction or contingency depending on its logical form and content.

A computer virus is designed to spread by inserting its code into host programs or documents. When an infected file runs, the virus activates, potentially damaging data or degrading performance. It may also attempt to infect additional files or systems. This behaviour of attaching and replicating is central to standard definitions of a virus.

Option A:
Protective software is the opposite of a virus; it is meant to detect and remove malicious code. Claiming that a virus always speeds up a system contradicts its harmful nature.

Option B:
A hardware device used for boosting Wi-Fi signals, such as a router or range extender, is part of the network infrastructure, not malicious code. It does not attach itself to files or replicate, so it is not a virus.

Option C:
This option correctly distinguishes viruses from other malware such as worms, which can spread independently, and trojans, which masquerade as useful programs. It captures the key idea of replication through host files.

Option D:
Desktop wallpaper images are graphical elements without self-replicating logic. They do not spread themselves or infect programs, so they are not viruses.

Ethical conduct, confidentiality and fairness are professional standards; adhering to them reflects teacher professionalism.

Option A:
Popularity is being liked and does not equal ethical/professional compliance.

Option B:
Professionalism includes ethics, confidentiality and fair evaluation, matching the stem.

Option C:
Charisma is personal charm and cannot replace ethical responsibilities.

Option D:
Seniority is years of service and does not guarantee ethical professional conduct.

The operating system is the core system software that coordinates interactions between hardware and application programs. It handles tasks such as memory allocation, process scheduling, file management and device control. Without an operating system, most applications cannot run effectively. Hence, the managing software described in the stem is the operating system.

Option A:
Option A is correct because definitions of operating systems consistently emphasise resource management and service provision for applications. Examples include Windows, Linux and macOS, all of which perform the roles listed in the question.

Option B:
Option B, word processor, is a specific application for creating and editing documents and does not manage hardware resources. It itself depends on the operating system to function.

Option C:
Option C, browser extension, is an add-on module that enhances browser capabilities and cannot perform system-wide resource management.

Option D:
Option D, device driver, is a specialised program that allows the operating system to communicate with a specific hardware component, but it is not the overarching manager of all resources.

Each group is a three letter palindrome where the first and last letters are the same and increase in order A, B, C, D. The middle letters move backwards from the end of the alphabet in the order Z, Y, X, W. The next outer letter should be E and the next middle letter in this backward sequence should be V. Thus EVE is the only group that satisfies both movements simultaneously.

Option A:
Option A, EUE, uses E correctly as the outer letter but chooses U instead of V for the middle position. The middle letters have been stepping down one letter at a time from Z, and U would skip V in that sequence. Because it breaks this simple reverse progression, EUE cannot be the right continuation.

Option B:
Option B is correct because it combines E as the next outer letter and V as the next middle letter after W. It preserves the palindromic structure and keeps the two opposing movements of outer letters forward and inner letters backward perfectly intact. This strict adherence to the observed pattern makes EVE the logical next term.

Option C:
Option C, EVF, is not a palindrome at all since the first and last letters do not match. The series clearly uses groups where the outer letters are identical. By breaking this defining structural feature, EVF fails to follow the pattern of the series.

Option D:
Option D, EWE, keeps the palindromic structure but repeats W as the middle letter instead of moving to V. This freezes the backward movement of the central letters, which has been consistent so far. Therefore EWE does not continue the pattern correctly.

This series follows the rule aₙ = 2n⁴ + 5n² + 3 with n starting from 1. Substituting n = 1, 2, 3, 4 and 5 yields 2+5+3 = 10, 32+20+3 = 55, 162+45+3 = 210, 512+80+3 = 595 and 1250+125+3 = 1378, which matches the given numbers. For n = 6 we compute 2·6⁴+5·6²+3 = 2592+180+3 = 2775. Therefore 2775 is the unique next term consistent with this quartic-plus-quadratic-plus-constant structure.

Option A:
Option A, 2715, is 60 less than the formula output and does not satisfy aₙ = 2n⁴+5n²+3 for n = 6. It introduces an arbitrary downward adjustment that is not indicated by the previous terms. Hence option A is incorrect.

Option B:
Option B, 2775, equals exactly the value obtained by applying the expression to n = 6. It preserves the same coefficients and constant term that were used to generate all earlier entries in the series. Because it fits seamlessly into the algebraic rule, 2775 is the correct next term.

Option C:
Option C, 2835, overshoots the correct value by 60 and again does not arise from substituting n = 6 into the rule. Choosing 2835 would inflate the sixth term without any support from the structure of the series. Therefore option C is incorrect.

Option D:
Option D, 2895, deviates even more from the computed value and has no foundation in the expression 2n⁴+5n²+3. Using 2895 would destroy the precise link between index and term, so option D is incorrect.

NEP 2020 proposes the Gender Inclusion Fund to help states design and implement programmes that remove barriers faced by girls and transgender learners. This includes facilities like hostels, toilets, safety measures and scholarships directly linked to educational participation.

Option A:
This option is correct because it describes educational interventions—hostels, sanitary facilities and scholarships—that match the stated purpose of the Gender Inclusion Fund.

Option B:
Funding sports mega-events only for boys would reinforce gender inequality and does not align with the fund’s focus on inclusion for girls and transgender learners.

Option C:
Providing subsidies solely to private coaching centres does not directly address access, safety or infrastructure needs in school education for marginalised genders.

Option D:
Financing commercial projects that are unrelated to education falls outside the scope of a fund meant specifically for gender inclusion in education.

Statements A, B and D correctly explain the roles of search engines and subject gateways, while statement C is false. Search engines use automated crawlers and do not always judge academic quality, whereas subject gateways are curated by experts for specific disciplines. Using such gateways can improve the reliability of sources consulted by researchers. Therefore the combination A, B and D only is correct.

Option A:
Option A is incomplete because it includes only A and B and omits D. While A and B explain indexing and curation, they do not highlight the benefit of subject gateways for reliability, which D adds. Excluding D makes the answer less informative.

Option B:
Option B is correct because it combines statements that accurately differentiate broad, automated search engines from curated gateways and recognises their academic value. It excludes C, which wrongly assumes that all indexed pages are academically evaluated.

Option C:
Option C is incorrect because it lists only B and D and omits A. A provides the basic description of how general search engines work, so leaving it out gives an incomplete picture of web search.

Option D:
Option D is incorrect because it treats all four statements as correct and thereby accepts C. Since C misrepresents the indexing process, this combination cannot be considered correct.

Statements A, C, D and F correctly explain that expectations shape teacher behaviour, influence motivation, can introduce bias and can be examined to reduce stereotyping. Statement B is wrong because high expectations, when combined with appropriate support, generally benefit rather than harm low-achieving students. Statement E is also wrong because teacher expectations do affect interaction patterns, such as attention, questioning and feedback. Thus, the wrong statements are B and E only, so option A is the correct answer.

Option A:
Option A identifies B and E as the incorrect statements, accurately reflecting that they misrepresent the role and impact of teacher expectations on learners and classroom processes. It excludes A, C, D and F, which provide sound explanations consistent with research on expectations. Since it includes all and only the wrong statements, B and E only is the correct combination.

Option B:
Option B selects only B as wrong and overlooks E, even though E denies the well-documented link between expectations and interaction patterns. Because both B and E are incorrect, identifying only B leads to an incomplete answer. Therefore B only cannot be accepted.

Option C:
Option C singles out E as wrong but fails to note that B also misrepresents the potential benefits of high expectations when combined with support. Ignoring this additional incorrect statement means E only is insufficient. Hence option C is not correct.

Option D:
Option D combines B, C and E but treats C as wrong despite it accurately emphasising that belief in students' abilities can raise motivation and effort. Including a true statement among the supposed wrong ones makes this set logically inconsistent. Thus B, C and E only cannot be the right answer.

Option E includes A, B and E as wrong statements, but A is a true statement describing how expectations influence academic performance through teacher behaviour. Misclassifying A as wrong undermines the evidence on expectation effects. Consequently A, B and E only is not a valid answer.

Option F groups B, E and F, but F is a true statement pointing out that reflecting on expectations can help reduce stereotyping. Labelling F as wrong along with B and E shows confusion about reflective practice. Therefore B, E and F only cannot be considered correct.

Statement D is the only wrong statement because eutrophication usually leads to algal blooms that can deplete dissolved oxygen and harm aquatic life rather than benefit it. Statements A, B and C correctly explain the process of eutrophication, the nature of point sources and examples of non-point sources such as agricultural runoff. Thus, identifying D only as the wrong statement matches the scientific understanding of water pollution and eutrophication.

Option A:
Option A is incorrect because it treats statement A as wrong, whereas A correctly defines eutrophication as nutrient enrichment causing excessive algal growth in water bodies. This phenomenon is widely recognised in limnology and environmental science. Misclassifying a correct definition as wrong makes this option invalid.

Option B:
Option B is correct because it pinpoints D as the single incorrect statement. Eutrophication tends to reduce oxygen levels through decomposition of algal biomass and can lead to fish kills and ecosystem degradation. Since A, B and C are accurate descriptions of relevant concepts, focusing on D only as wrong is logically consistent with the question.

Option C:
Option C is incorrect because it assumes both A and D are wrong. While D is indeed wrong, A is correct and supported by numerous environmental case studies on lakes and reservoirs. Including a correct statement in the set of wrong statements makes the combination unacceptable.

Option D:
Option D is incorrect because it groups C and D together as wrong statements. Although D is wrong, C is correct in identifying agricultural runoff and urban stormwater as typical non-point sources. Treating C as wrong contradicts standard classifications used in pollution control.

Statements A, B and C are consistent with accepted definitions and ethical guidelines for learning analytics, whereas D conflicts with transparency principles. Analytics aims to enhance learning but must be conducted in ways that respect privacy and inform students. Anonymisation or pseudonymisation helps reduce risks when analysing large datasets. Keeping learners completely uninformed about data practices would violate trust and ethical standards.

Option A:
Option A is incomplete because it includes only A and B and omits C. While purpose and transparency are important, mentioning privacy-preserving techniques such as anonymisation is also essential to ethical practice.

Option B:
Option B is incomplete because it lists only B and C and leaves out A. Without stating the improvement-oriented goal of analytics, there is no clear rationale for collecting and processing learner data.

Option C:
Option C is incomplete because it groups A and C only and ignores B. Statement B about transparency is central to respecting autonomy and informed consent, so its omission weakens the ethical perspective.

Option D:
Option D is correct because it gathers the three true statements and excludes D, which advocates secrecy rather than openness. It reflects a balanced view that combines potential benefits of analytics with privacy and communication responsibilities.

Statements A, B, C and E are correct because adequate toilets, clean water, handwashing and participatory clubs all support better health and learning outcomes. Statement D is false as school conditions clearly affect health, nutrition and ability to study. Statement F is false since poor waste management can attract vectors, create odour and contaminate the environment around schools. Hence, the combination A, B, C and E only is correct.

Option A:
Option A is incorrect as it omits E and so ignores the important role of student-led initiatives and peer learning in sustaining hygiene and environmental practices.

Option B:
Option B is correct because it includes all true statements (A, B, C, E) and excludes D and F, which wrongly deny the importance of school environment and waste management for health.

Option C:
Option C is incorrect since it omits A and underplays the gendered impact of toilet facilities on attendance, especially for adolescent girls.

Option D:
Option D is incorrect because it includes D, which is false (school environments do affect health and learning), so the combination cannot be correct.