UGC NET Questions (Paper – 1)

Statements A, B, D and E are correct and consistent with basic climate science. Statement A correctly lists major anthropogenic greenhouse gases, statement B explains how they trap outgoing long-wave radiation, statement D points to human-induced enhancement of global warming and statement E recognises the protective role of stratospheric ozone. Statement C is incorrect because the natural greenhouse effect is essential for maintaining Earth’s mean temperature at a habitable level. Therefore, the only combination that includes all true statements while excluding the false one is A, B, D and E.

Option A:
Option A is incorrect because it includes A, B and D but omits E. While A, B and D are indeed correct statements, E is also correct as stratospheric ozone shields living organisms from harmful ultraviolet radiation. By leaving out a true statement, this option does not fully capture the set of correct statements.

Option B:
Option B is correct because it includes statements A, B, D and E, all of which are scientifically accurate. It excludes statement C, which falsely portrays the greenhouse effect as entirely harmful and ignores its natural role in maintaining habitable temperatures. Hence, this option represents the complete and precise set of correct statements asked for in the question.

Option C:
Option C is incorrect because it adds statement C to the set of otherwise correct statements A, B and D. Statement C is wrong since the greenhouse effect in its natural form is beneficial and only its anthropogenic enhancement is problematic. Including a false statement makes this combination unacceptable.

Option D:
Option D is incorrect because it combines B, C, D and E. Although B, D and E are correct, the presence of statement C, which misrepresents the greenhouse effect as wholly harmful, makes the entire combination wrong. A valid answer must exclude all incorrect statements.

Decimal 0.375 equals 3/8. In binary, the fraction 1/4 is 0.01₂ and 1/8 is 0.001₂, so 3/8 is 1/4 + 1/8. The binary sum of 0.01₂ and 0.001₂ gives 0.011₂. Therefore, 0.011₂ is the exact binary representation of 0.375.

Option A:
Option A is correct because it has ones in the 2^-2 and 2^-3 positions, giving 1/4 + 1/8 = 3/8. This matches the decimal fraction exactly.

Option B:
Option B, 0.001₂, represents 1/8 or 0.125 in decimal, which is too small compared to 0.375. It lacks the 1/4 component.

Option C:
Option C, 0.01₂, equals 1/4 or 0.25 in decimal, still smaller than 0.375. It accounts for only one of the required fractional parts.

Option D:
Option D, 0.111₂, equals 1/2 + 1/4 + 1/8 = 7/8 or 0.875 in decimal, which is much larger than 0.375.

The operating system mediates interactions between users and hardware by providing a user-friendly environment and standardised services. Users issue commands via graphical or command interfaces, and the OS translates these into low-level hardware instructions. It shields users from the complexity of device management and memory handling. Hence it functions as an interface between the user and the hardware.

Option A:
Option A, a compiler, translates high-level programming code into machine code but does not manage overall user interaction with the system. It is a development tool that itself runs under the operating system. Therefore it cannot be regarded as the primary interface.

Option B:
Option B, network protocol, specifies rules for communication between networked devices. Protocols operate at communication layers and are implemented within or above the OS, but they are not themselves the general interface for all user–hardware interaction.

Option C:
Option C, firewall, is a security component controlling network traffic and is often implemented as part of system software. However, it plays a protective role rather than providing a broad user interface to all hardware resources.

Option D:
Option D is correct because the OS presents menus, windows and commands that allow users to control programs and hardware without dealing directly with low-level details. This intermediary role is accurately summarised as acting as an interface.

Physical barriers are caused by environmental conditions or structural obstacles that interfere with message reception. A pillar blocking the view of the board is a clear structural obstacle. It prevents students from seeing visual information even though the message itself is clear. Thus this is a physical barrier.

Option A:
Physical barriers also include poor lighting or noise,and all relate to tangible conditions in the environment,matching the example,making option A correct.

Option B:
Semantic barriers arise from problems in word meaning or language use,not from blocked sightlines.

Option C:
Psychological barriers involve emotions or attitudes such as fear or prejudice,which are not mentioned in the stem.

Option D:
Organisational barriers stem from hierarchical structures and procedures,rather than seating arrangements in a single classroom.

Feedback is the information that receivers send back to the source about how they have understood or responded to the message. In teaching,questions and quiz scores reveal learners' current level of comprehension. This information helps the teacher modify pace,methods and explanations. Therefore these responses are best described as feedback.

Option A:
Message refers to the original ideas and content sent from teacher to students,not to the responses that come back. Although feedback may become a new message later,it is conceptually distinct from the initial one.

Option B:
Channel denotes the medium of transmission,such as speech or written tests,whereas the question focuses on the information about understanding,not the medium itself.

Option C:
Noise is any unwanted disturbance that interferes with message transmission,while questions and scores are intentional signals used to improve clarity,so they cannot be classified as noise.

Option D:
Feedback closes the communication loop and converts a one way lecture into an interactive process. When teachers read quiz performance,they gain concrete evidence of learning gaps,which is central to formative evaluation. This directly supports choosing feedback as the correct option.

Data backup involves copying files or databases to secondary storage so that information can be restored after hardware failure, accidental deletion or other disasters. Regular backups are essential for organisational resilience. ICT policies usually specify backup schedules and methods. Hence, the practice described is data backup.

Option A:
Option A is correct because backup specifically denotes maintaining extra copies of data for recovery purposes.

Option B:
Option B, formatting, prepares a storage medium for use and usually erases existing data, which is the opposite of preservation.

Option C:
Option C, deletion, removes data and increases risk of loss rather than protection.

Option D:
Option D, fragmentation, refers to data being scattered on a disk, which may affect performance but is unrelated to safety copies.

A wide area network connects devices and smaller networks across cities, countries or continents, typically using leased telephone lines, satellite links or the internet. The defining characteristic of a WAN is its broad geographical span. Many universities link their campuses with WANs. Hence, the correct term for the type of network described is wide area network.

Option A:
Option A, local area network, is confined to small areas such as a building and cannot accurately represent connections over large distances.

Option B:
Option B, metropolitan area network, covers a city or metropolitan region, which is intermediate between LAN and WAN and not necessarily national or global.

Option C:
Option C is correct because wide area network is the standard term in networking classifications for long distance interconnection of devices and LANs.

Option D:
Option D, storage area network, refers to a specialised high speed network for storage devices in a data centre and does not primarily describe geographical spread.

BCFI, CDGJ, DEHK and EFIL all share the same pattern of unequal gaps between consecutive letters, and each new group is obtained by moving every letter one place forward in the alphabet. Looking at the columns, the first letters go B, C, D, E, the second C, D, E, F, the third F, G, H, I and the fourth I, J, K, L. Continuing these sequences, the next group should have first letter F, second G, third J and fourth M. That forms FGJM, which keeps both the internal spacing pattern and the column wise advancement, making it the correct answer.

Option A:
Option A, FGKM, uses F and G as the first two letters but changes the last two so that the third and fourth columns do not follow their observed sequences. The internal distance between K and M also differs from that in the earlier groups. Because it fails to preserve both aspects of the pattern, FGKM is not the correct continuation.

Option B:
Option B is correct because FGJM comes from shifting every letter in EFIL forward by one step and it maintains the same uneven yet consistent gaps inside the group. The series of first letters B, C, D, E extends to F and the other columns behave similarly. This faithful extension of the structure confirms FGJM as the next term.

Option C:
Option C, GHJM, starts with G instead of F, breaking the simple one step increase for the first letters. Its other letters also do not match the vertical progressions exactly. Therefore GHJM does not fit the rule governing the series.

Option D:
Option D, EGJM, retains some letters from EFIL but does not move all positions forward simultaneously. That contradicts the clear pattern that every letter in a term is advanced together to create the next term. Hence EGJM cannot be the correct answer.

This option is correct because the sum of the interior angles of a triangle in Euclidean geometry is always 180 degrees. This can be shown using parallel lines and alternate interior angles. Every triangle can be thought of as half of a straight line angle sum. Therefore, the correct total is 180 degrees.

Option A:
90 degrees is the measure of a right angle, not the sum of all angles in a triangle. Only one angle in a right triangle is 90 degrees. Thus, this value is too small for the total.

Option B:
270 degrees exceeds the known sum of angles in a triangle and does not correspond to any standard triangle property. It is closer to the sum for different configurations, not a simple triangle. Hence, this option is not valid.

Option C:
360 degrees is the angle measure around a point, not inside a triangle. It equals the sum of interior angles of a quadrilateral, not a triangle. Therefore, it cannot be the correct answer.

Option D:
180 degrees is the established sum for any triangle in a plane. No matter the shape of the triangle, the three interior angles always add up to 180 degrees. This property is widely used in geometry problems, confirming this option as correct.

NEP 2020 states that stand-alone teacher education institutions will gradually be phased out. Teacher preparation is to be moved into multidisciplinary HEIs so that prospective teachers experience a rich academic environment. This integration improves quality and status of teacher education.

Option A:
Keeping teacher education isolated in stand-alone colleges has contributed to poor quality and low status, which NEP criticises.

Option B:
This option matches the explicit recommendation that teacher education be part of universities and multidisciplinary colleges, supporting cross-disciplinary learning and research.

Option C:
Commercial institutes alone cannot ensure academic rigour and public accountability expected of teacher education programmes.

Option D:
Weekend workshops are useful for in-service training but cannot replace full pre-service programmes leading to a B.Ed.

A firewall enforces a security policy by examining incoming and outgoing packets and deciding whether to allow or block them. It can be configured to restrict access to certain ports, addresses or protocols, thereby reducing exposure to attacks. Firewalls are a key component of network perimeter defence in organisations. Thus the protective mechanism described in the stem is a firewall.

Option A:
Option A, router, primarily handles routing packets between networks and may include some filtering features, but routing is its main purpose. Without specific security configurations, it does not offer comprehensive protection.

Option B:
Option B, gateway, refers to a device or software that connects networks using different protocols and is focused on translation and connectivity rather than security enforcement alone.

Option C:
Option C, antivirus scanner, inspects files and memory for malicious code on individual hosts rather than controlling network traffic flows across a boundary. Its scope is different from that of a firewall.

Option D:
Option D is correct because firewalls are explicitly defined as systems that monitor and regulate network connections according to configured rules, matching the wording in the question.

To convert 13.625 to binary, we separately convert the integer part 13 and the fractional part 0.625. The integer 13 becomes 1101₂, and 0.625 corresponds to 0.101₂ because 0.625 = 1/2 + 0/4 + 1/8. Combining them gives 1101.101₂. Therefore, 1101.101 is the correct binary representation of 13.625.

Option A:
1101.101₂ has an integer part 1101₂ (13) and fractional part .101₂ which equals 1/2 + 0/4 + 1/8 = 0.625. Adding these yields 13.625, exactly matching the decimal given. This confirms that this option is the correct binary fraction.

Option B:
1101.011₂ has the same integer part 13 but the fractional part .011₂ equals 0/2 + 1/4 + 1/8 = 0.375. Thus the total value is 13.375, which is lower than 13.625, making this option incorrect.

Option C:
1100.111₂ represents an integer part of 12 with fractional part .111₂ = 0.875, giving 12.875. Because the integer part itself is different, this cannot equal 13.625.

Option D:
1101.11₂ has integer part 13 and fractional part .11₂ = 1/2 + 1/4 = 0.75, giving 13.75. This is higher than the target decimal, so it is not the correct binary representation.

NEP 2020 suggests that coding and computational thinking can be introduced from the middle stage, when students are developmentally ready for structured logical reasoning and simple programming.

Option A:
Introducing coding in early childhood would not be age-appropriate; the focus there is on play, language and basic social skills.

Option B:
In the preparatory stage the emphasis is still on consolidating foundational literacy and numeracy, not formal coding.

Option C:
This option correctly identifies the middle stage (Grades 6–8) as the point where NEP 2020 proposes to begin coding and computational thinking.

Option D:
Restricting coding only to higher education ignores NEP’s aim of building these skills gradually from school level onward.

In logic, to say that p implies q is to assert that whenever p is true, q must also be true. This relation is captured formally by the conditional "if p, then q". The guarantee of truth transfer from p to q is the essence of implication. Thus the relation described in the stem is that p implies q.

Option A:
Option A, contradicts, would mean that p and q cannot both be true at the same time, which is the opposite of what is stated. Contradiction signals incompatibility, not guaranteed co-truth. Therefore contradicts is not appropriate.

Option B:
Option B, equals, suggests identity rather than a directional truth-preserving relation. Logical equivalence does require mutual implication, but simple equality does not capture the idea of one truth ensuring another. Hence equals is not the right term here.

Option C:
Option C is correct because implies is the standard expression for a relation where the truth of one statement ensures the truth of another. It is central to conditional logic and validity.

Option D:
Option D, excludes, implies mutual incompatibility or inability to coexist, which again contradicts the idea that the truth of one statement forces the truth of another. Consequently excludes is not suitable.

The 2022 notification banned a list of 19 single-use plastic items that typically have short useful lives but high littering potential. Examples include earbuds with plastic sticks, certain plates, cups, cutlery and decorative thermocol. By targeting these low-utility items first, the policy aims to reduce visible pollution while giving time to design alternatives and improve management for other plastic products.

Option A:
This option is incorrect because many plastic products, especially essential and regulated uses, remain allowed; the ban is selective.

Option B:
This option correctly states the focus on low-utility, high-litter items and illustrates the rationale behind the list.

Option C:
Export-oriented units are not the primary focus; the ban addresses domestic circulation of these items.

Option D:
Carry bags are regulated mainly through minimum thickness requirements rather than a blanket ban on thicker bags.