Polytechnic Entrance Examination (JEECUP) — Questions and Answers

Question 1: What is Le Chatelier's Principle?

A system at equilibrium will shift to counteract any imposed change (Correct answer)
Temperature has no effect on equilibrium
Reactions always proceed to completion
Catalysts shift equilibrium position

Correct answer: A system at equilibrium will shift to counteract any imposed change

Le Chatelier's Principle states that a chemical system at equilibrium shifts its position to minimize the effect of any applied stress.

Question 2: What is the Doppler Effect?

The reflection of sound off surfaces
The interference of two waves
The change in frequency of a wave due to relative motion between source and observer (Correct answer)
The diffraction of light around obstacles

Correct answer: The change in frequency of a wave due to relative motion between source and observer

The Doppler Effect describes how the observed frequency of a wave changes when the source or observer is moving relative to each other.

Question 3: What does the dot product of two perpendicular vectors equal?

0 (Correct answer)
-1
1
The magnitude of either vector

Correct answer: 0

The dot product of two perpendicular vectors is 0 because cos(90°) = 0.

Question 4: What is the Taylor series expansion of eˣ centered at x = 0?

1 + x + x² + x³ + ...
x + x²/2 + x³/3 + ...
1 - x + x²/2! - x³/3! + ...
1 + x + x²/2! + x³/3! + ... (Correct answer)

Correct answer: 1 + x + x²/2! + x³/3! + ...

The Maclaurin series for eˣ is the sum of xⁿ/n! for n from 0 to infinity.

Question 5: What is electric potential difference also known as?

Resistance
Power
Voltage (Correct answer)
Current

Correct answer: Voltage

Electric potential difference is commonly called voltage, measured in volts (V).

Question 6: What is the moment of inertia used to calculate?

Torque required to move an object
Resistance of an object to rotational acceleration (Correct answer)
Center of mass of an object
Resistance of an object to linear acceleration

Correct answer: Resistance of an object to rotational acceleration

Moment of inertia is the rotational analogue of mass and quantifies how difficult it is to change an object's rotational motion.

Question 7: What is the frequency of standard US household AC power?

100 Hz
120 Hz
60 Hz (Correct answer)
50 Hz

Correct answer: 60 Hz

Standard US household AC power operates at 60 Hz, completing 60 cycles per second.

Question 8: Which material property describes resistance to plastic deformation?

Toughness
Brittleness
Ductility
Hardness (Correct answer)

Correct answer: Hardness

Hardness is a material's resistance to permanent (plastic) deformation, often measured by indentation tests.

Question 9: Which data structure uses LIFO (Last In, First Out) order?

Tree
Linked List
Queue
Stack (Correct answer)

Correct answer: Stack

A stack follows LIFO order, where the last element added is the first one to be removed.

Question 10: Which logic gate outputs HIGH only when all inputs are HIGH?

NAND gate
NOR gate
AND gate (Correct answer)
OR gate

Correct answer: AND gate

An AND gate outputs HIGH (1) only when all of its inputs are HIGH (1), implementing logical conjunction.

Question 11: What is the determinant of a 2×2 matrix [[a,b],[c,d]]?

ad + bc
ab - cd
ac - bd
ad - bc (Correct answer)

Correct answer: ad - bc

The determinant of a 2×2 matrix is calculated as ad - bc, the product of the main diagonal minus the product of the off-diagonal.

Question 12: What is absolute zero on the Kelvin scale?

100 K
0 K (Correct answer)
-273.15 K
273.15 K

Correct answer: 0 K

Absolute zero is 0 K, which corresponds to -273.15°C, the theoretical lowest possible temperature.

Question 13: What is the base of the binary number system?

2 (Correct answer)
8
10
16

Correct answer: 2

The binary number system uses base 2, consisting only of the digits 0 and 1.

Question 14: What is recursion in programming?

A method for sorting arrays
A type of data structure
A loop that runs indefinitely
A function that calls itself to solve a problem (Correct answer)

Correct answer: A function that calls itself to solve a problem

Recursion is a technique where a function calls itself with a smaller input until it reaches a base case.

Question 15: In engineering ethics, what does 'informed consent' primarily refer to?

Written permission to use proprietary data
An engineer agreeing to take on a project
Government approval of a technical design
Participants or clients agreeing to procedures after being fully informed of risks (Correct answer)

Correct answer: Participants or clients agreeing to procedures after being fully informed of risks

Informed consent means all parties involved in a study or project have been fully briefed on risks, methods, and have voluntarily agreed to participate.

Question 16: What does HTML stand for?

High-Level Text Machine Language
Hyper Transfer Markup Language
HyperText Markup Language (Correct answer)
HyperText Management Language

Correct answer: HyperText Markup Language

HTML stands for HyperText Markup Language, the standard language for structuring web pages.

Question 17: What is the formula for kinetic energy?

KE = ½mv² (Correct answer)
KE = mv
KE = mgh
KE = ½mv

Correct answer: KE = ½mv²

Kinetic energy is ½mv², where m is mass and v is velocity.

Question 18: What is oxidation in a redox reaction?

Loss of electrons (Correct answer)
Gain of electrons
Loss of protons
Gain of protons

Correct answer: Loss of electrons

Oxidation is defined as the loss of electrons by a species in a redox reaction.

Question 19: In technical writing, what does 'audience analysis' involve?

Reviewing grammar and spelling for errors
Identifying the knowledge level, needs, and expectations of the readers (Correct answer)
Counting the number of people who will read the document
Selecting the appropriate font and layout

Correct answer: Identifying the knowledge level, needs, and expectations of the readers

Audience analysis determines who will read the document, their technical background, and what information they need to act effectively.

Question 20: What is the active voice in technical writing preferred for?

Expressing uncertainty in findings
Adding formality to the document
Clarity and directness by making the subject perform the action (Correct answer)
Describing ongoing processes

Correct answer: Clarity and directness by making the subject perform the action

Active voice ('The engineer tested the circuit') is clearer and more direct than passive voice ('The circuit was tested by the engineer').

Question 21: What is the pH of a neutral solution at 25°C?

0
14
7 (Correct answer)
1

Correct answer: 7

A neutral solution at 25°C has a pH of 7, where hydrogen ion concentration equals hydroxide ion concentration.

Question 22: What does AC stand for in electrical engineering?

Alternating Current (Correct answer)
Applied Circuit
Amplified Current
Automatic Control

Correct answer: Alternating Current

AC stands for Alternating Current, where the direction of current flow reverses periodically.

Question 23: What is the principle of conservation of momentum?

Total momentum of a closed system remains constant unless acted on by an external force (Correct answer)
Momentum is always zero in an isolated system
Momentum increases with velocity
Momentum and energy are always equal

Correct answer: Total momentum of a closed system remains constant unless acted on by an external force

In a closed system with no external forces, the total momentum before and after a collision remains the same.

Question 24: What is an isotope?

Atoms of the same element with different numbers of neutrons (Correct answer)
Atoms with the same number of electrons and neutrons
Atoms with different numbers of protons
Atoms of different elements with the same mass

Correct answer: Atoms of the same element with different numbers of neutrons

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons.

Question 25: Which law states that the volume of a gas is inversely proportional to its pressure at constant temperature?

Avogadro's Law
Boyle's Law (Correct answer)
Charles's Law
Gay-Lussac's Law

Correct answer: Boyle's Law

Boyle's Law states PV = constant at constant temperature, meaning pressure and volume vary inversely.

Question 26: What is a Boolean data type?

A data type for whole numbers
A data type that holds only true or false values (Correct answer)
A data type for decimal numbers
A data type for text strings

Correct answer: A data type that holds only true or false values

A Boolean data type represents logical values: true or false, corresponding to binary 1 or 0.

Question 27: Which of the following best describes stress in engineering mechanics?

Force times displacement
Force per unit area (Correct answer)
Energy per unit volume
Mass times acceleration

Correct answer: Force per unit area

Stress is defined as the internal force acting per unit cross-sectional area within a material.

Question 28: Which sorting algorithm has the best average-case time complexity?

Selection Sort (O(n²))
Bubble Sort (O(n²))
Merge Sort (O(n log n)) (Correct answer)
Insertion Sort (O(n²))

Correct answer: Merge Sort (O(n log n))

Merge Sort consistently achieves O(n log n) time complexity in all cases by using a divide-and-conquer approach.

Question 29: What is the purpose of an operating system?

To run only one program at a time
To store files permanently
To connect the computer to the internet
To manage hardware resources and provide services to applications (Correct answer)

Correct answer: To manage hardware resources and provide services to applications

An operating system manages hardware resources, memory, processes, and provides a platform for applications to run.

Question 30: What is Newton's Second Law of Motion?

F = ma (Correct answer)
F = m/a
F = mv
F = m + a

Correct answer: F = ma

Newton's Second Law states that the net force on an object equals its mass multiplied by its acceleration.

Question 31: What does an inductor do in an electrical circuit?

Converts electrical energy to heat
Stores energy in an electric field
Amplifies voltage
Stores energy in a magnetic field and opposes changes in current (Correct answer)

Correct answer: Stores energy in a magnetic field and opposes changes in current

An inductor stores energy in its magnetic field and resists changes in current through electromagnetic induction.

Question 32: What is the atomic number of carbon?

12
6 (Correct answer)
8
4

Correct answer: 6

Carbon has an atomic number of 6, meaning it has 6 protons in its nucleus.

Question 33: A transformer has 200 primary turns and 50 secondary turns. If the primary voltage is 240V, what is the secondary voltage?

480V
960V
60V (Correct answer)
120V

Correct answer: 60V

Using V2/V1 = N2/N1: V2 = 240 × (50/200) = 60V (step-down transformer).

Question 34: What is the SI unit of power?

Pascal (Pa)
Watt (W) (Correct answer)
Newton (N)
Joule (J)

Correct answer: Watt (W)

Power is measured in watts (W), where 1 watt equals 1 joule per second.

Question 35: What type of circuit has components connected so they share the same two nodes (same voltage across each)?

Mixed circuit
Series circuit
Bridge circuit
Parallel circuit (Correct answer)

Correct answer: Parallel circuit

In a parallel circuit, all components share the same two nodes and therefore have the same voltage across them.

Question 36: What is the efficiency of a machine?

Useful output energy divided by total input energy (Correct answer)
Output force divided by input force
Total input energy divided by useful output energy
Input power minus output power

Correct answer: Useful output energy divided by total input energy

Efficiency = (useful output energy / total input energy) × 100%, and it is always less than 100% due to losses.

Question 37: What does OOP stand for in programming?

Output-Oriented Programming
Optimized Object Processing
Object-Oriented Programming (Correct answer)
Open-Oriented Programming

Correct answer: Object-Oriented Programming

OOP stands for Object-Oriented Programming, a paradigm that organizes code around objects with attributes and methods.

Question 38: What is the molecular formula of water?

HO₂
HO
H₂O₂
H₂O (Correct answer)

Correct answer: H₂O

Water has the molecular formula H₂O, consisting of two hydrogen atoms bonded to one oxygen atom.

Question 39: How many electrons can the second electron shell hold?

18
8 (Correct answer)
32
2

Correct answer: 8

The second electron shell (n=2) can hold a maximum of 8 electrons, filling the 2s and 2p subshells.

Question 40: What is the difference between precision and accuracy in technical measurements?

Precision is repeatability; accuracy is closeness to the true value (Correct answer)
Precision is closeness to true value; accuracy is repeatability
Precision applies to digital; accuracy applies to analog measurements
They are synonyms in technical contexts

Correct answer: Precision is repeatability; accuracy is closeness to the true value

Accuracy describes how close a measurement is to the true value, while precision describes how repeatable measurements are.

Question 41: In a series circuit, how is total resistance calculated?

R_total = R1 - R2
R_total = R1 × R2 × R3
1/R_total = 1/R1 + 1/R2 + ...
R_total = R1 + R2 + R3 + ... (Correct answer)

Correct answer: R_total = R1 + R2 + R3 + ...

In a series circuit, resistances simply add together to give the total resistance.

Question 42: What is the value of e⁰?

0
Undefined
1 (Correct answer)
e

Correct answer: 1

Any nonzero number raised to the power 0 equals 1, so e⁰ = 1.

Question 43: What is Avogadro's number?

3.14 × 10²³
6.022 × 10²³ (Correct answer)
1.67 × 10⁻²⁷
6.022 × 10²⁰

Correct answer: 6.022 × 10²³

Avogadro's number is 6.022 × 10²³, representing the number of particles in one mole of a substance.

Question 44: What is Boyle's Law in terms of gas pressure and volume?

At constant volume, pressure and temperature are directly proportional
Gas volume is constant regardless of pressure
At constant pressure, volume and temperature are directly proportional
At constant temperature, pressure and volume of a gas are inversely proportional (Correct answer)

Correct answer: At constant temperature, pressure and volume of a gas are inversely proportional

Boyle's Law states P₁V₁ = P₂V₂ at constant temperature — halving the volume doubles the pressure.

Question 45: What is the relationship between force and acceleration in Newton's Second Law?

Force is inversely proportional to acceleration
Force and acceleration are independent
Force is directly proportional to acceleration (Correct answer)
Force equals acceleration divided by mass

Correct answer: Force is directly proportional to acceleration

F = ma shows that force is directly proportional to acceleration — doubling force doubles acceleration for a fixed mass.

Question 46: Kirchhoff's Current Law (KCL) states that:

Resistance increases with temperature
Voltage around a closed loop equals zero
The sum of currents entering a node equals the sum leaving it (Correct answer)
Power equals voltage times time

Correct answer: The sum of currents entering a node equals the sum leaving it

KCL states that the algebraic sum of all currents at a node is zero, meaning current in equals current out.

Question 47: In fluid mechanics, what does Pascal's Law state?

Fluid velocity increases as cross-sectional area decreases
Buoyant force equals the weight of displaced fluid
Pressure applied to a confined fluid is transmitted equally in all directions (Correct answer)
Viscosity decreases as temperature increases

Correct answer: Pressure applied to a confined fluid is transmitted equally in all directions

Pascal's Law states that pressure changes in a confined fluid propagate uniformly throughout the fluid.

Question 48: What is a Gantt chart used for in project planning?

Mapping data flow between systems
Tracking financial budgets
Displaying organizational hierarchy
Visualizing project tasks, timelines, and dependencies (Correct answer)

Correct answer: Visualizing project tasks, timelines, and dependencies

A Gantt chart displays project tasks as horizontal bars along a timeline, showing start/end dates and task dependencies.

Question 49: What is the value of log₂(64)?

8
5
4
6 (Correct answer)

Correct answer: 6

log₂(64) = 6 because 2⁶ = 64.

Question 50: What is the Second Law of Thermodynamics?

Work done is always equal to heat added
Heat always flows from hot to cold only when forced
Entropy of an isolated system always increases over time (Correct answer)
Energy is conserved in all processes

Correct answer: Entropy of an isolated system always increases over time

The Second Law states that entropy (disorder) in an isolated system tends to increase, making certain processes irreversible.

Question 51: What is the unit of electrical resistance?

Farad
Ohm (Correct answer)
Henry
Siemens

Correct answer: Ohm

Electrical resistance is measured in Ohms (Ω), named after physicist Georg Simon Ohm.

Question 52: What is the purpose of peer review in technical publications?

To make the paper longer and more detailed
To increase the number of citations
To convert informal writing to formal style
To ensure quality and validity of research before publication (Correct answer)

Correct answer: To ensure quality and validity of research before publication

Peer review involves experts in the field evaluating a paper for accuracy, methodology, and significance before it is published.

Question 53: What is the purpose of an abstract in a scientific or technical paper?

To list all references cited in the paper
To introduce the topic and provide background information
To provide a brief summary of the paper's purpose, methods, results, and conclusions (Correct answer)
To describe the experimental apparatus in detail

Correct answer: To provide a brief summary of the paper's purpose, methods, results, and conclusions

An abstract is a condensed summary (typically 150–300 words) that allows readers to quickly determine the relevance of the paper.

Question 54: What does HTTP stand for?

HyperText Transfer Protocol (Correct answer)
Hyperlink Text Transfer Protocol
High-Traffic Transfer Protocol
HyperText Transmission Protocol

Correct answer: HyperText Transfer Protocol

HTTP stands for HyperText Transfer Protocol, the foundation of data communication on the World Wide Web.

Question 55: What type of reaction is: A + BC → AC + B?

Synthesis reaction
Double displacement reaction
Decomposition reaction
Single displacement (substitution) reaction (Correct answer)

Correct answer: Single displacement (substitution) reaction

In a single displacement reaction, one element replaces a similar element in a compound.

Question 56: What is a mole in chemistry?

A unit representing 6.022 × 10²³ particles (Correct answer)
A unit of mass equal to one gram
A unit of concentration
A unit of molecular weight

Correct answer: A unit representing 6.022 × 10²³ particles

A mole is a standard unit of amount in chemistry representing 6.022 × 10²³ particles (atoms, molecules, or ions).

Question 57: What is the time complexity of binary search?

O(log n) (Correct answer)
O(n)
O(n²)
O(1)

Correct answer: O(log n)

Binary search halves the search space at each step, resulting in O(log n) time complexity.

Question 58: What does the Fundamental Theorem of Calculus connect?

Limits and derivatives
Series and sequences
Differentiation and integration (Correct answer)
Vectors and matrices

Correct answer: Differentiation and integration

The Fundamental Theorem of Calculus states that differentiation and integration are inverse operations.

Question 59: What does SQL stand for?

Standard Query Language
Stored Query Language
Sequential Query Language
Structured Query Language (Correct answer)

Correct answer: Structured Query Language

SQL stands for Structured Query Language, the standard language for managing and querying relational databases.

Question 60: What does the periodic table organize elements by?

Alphabetical order
Increasing atomic mass only
Decreasing electronegativity
Increasing atomic number (Correct answer)

Correct answer: Increasing atomic number

Elements in the modern periodic table are arranged in order of increasing atomic number (number of protons).

Question 61: What does CPU stand for?

Central Program Utility
Core Processing Unit
Computer Processing Unit
Central Processing Unit (Correct answer)

Correct answer: Central Processing Unit

CPU stands for Central Processing Unit, the primary component that executes instructions in a computer.

Question 62: What is the general solution form of a first-order linear differential equation?

Only the particular solution
The product of homogeneous and particular solutions
Only the homogeneous solution
Homogeneous solution plus particular solution (Correct answer)

Correct answer: Homogeneous solution plus particular solution

The general solution is the sum of the homogeneous (complementary) solution and the particular solution.

Question 63: What is the speed of light in a vacuum?

3 × 10¹⁰ m/s
3 × 10⁶ m/s
3 × 10⁴ m/s
3 × 10⁸ m/s (Correct answer)

Correct answer: 3 × 10⁸ m/s

The speed of light in a vacuum is approximately 3 × 10⁸ meters per second (299,792,458 m/s exactly).

Question 64: What is the value of sin(90°)?

-1
0
0.5
1 (Correct answer)

Correct answer: 1

Sin(90°) equals 1, which corresponds to the maximum value of the sine function.

Question 65: In Boolean algebra, what is the result of A + Ā (A OR NOT-A)?

Ā
A
1 (Correct answer)
0

Correct answer: 1

A OR NOT-A always equals 1 (TRUE) because either A or its complement must be true — this is the complement law.

Question 66: What is the purpose of a voltage divider circuit?

To produce a lower output voltage from a higher input voltage (Correct answer)
To store electrical energy
To increase current in a branch
To convert AC to DC

Correct answer: To produce a lower output voltage from a higher input voltage

A voltage divider uses two resistors in series to produce an output voltage that is a fraction of the input voltage.

Question 67: What is the unit of frequency?

Hertz (Hz) (Correct answer)
Joule (J)
Newton (N)
Kelvin (K)

Correct answer: Hertz (Hz)

Frequency is measured in hertz (Hz), where 1 Hz equals one cycle per second.

Question 68: What phenomenon describes the bending of light as it passes through a lens?

Refraction (Correct answer)
Interference
Diffraction
Reflection

Correct answer: Refraction

Refraction is the bending of light as it passes through a medium of different optical density, as in a lens.

Question 69: Which conic section is defined by the equation x² + y² = r²?

Hyperbola
Parabola
Ellipse
Circle (Correct answer)

Correct answer: Circle

The equation x² + y² = r² represents a circle of radius r centered at the origin.

Question 70: What is the slope of a line perpendicular to y = 2x + 3?

2
1/2
-1/2 (Correct answer)
-2

Correct answer: -1/2

Perpendicular lines have slopes that are negative reciprocals of each other, so the slope is -1/2.

Question 71: What is the sum of interior angles of a hexagon?

360°
540°
900°
720° (Correct answer)

Correct answer: 720°

Using the formula (n-2) × 180°, a hexagon has (6-2) × 180° = 720°.

Question 72: What is a primary key in a relational database?

A unique identifier for each row in a table (Correct answer)
An index for faster queries
The first column of a table
A foreign reference to another table

Correct answer: A unique identifier for each row in a table

A primary key uniquely identifies each record in a database table and cannot be null.

Question 73: What is the role of a specification document in engineering projects?

To provide instructions for end users
To document the history of design changes
To summarize project expenses
To define the requirements, constraints, and performance criteria a system must meet (Correct answer)

Correct answer: To define the requirements, constraints, and performance criteria a system must meet

A specification document precisely defines what a system must do (functional requirements) and how well it must do it (performance requirements).

Question 74: What is nuclear fission?

Absorption of a neutron by a nucleus
Splitting of a heavy nucleus into two lighter nuclei, releasing energy (Correct answer)
Combining two light nuclei to form a heavier one
Emission of radiation from an unstable nucleus

Correct answer: Splitting of a heavy nucleus into two lighter nuclei, releasing energy

Nuclear fission is the process where a heavy atomic nucleus (like uranium-235) splits into smaller fragments, releasing a large amount of energy.

Question 75: Which type of transistor uses a base, collector, and emitter terminal?

MOSFET
BJT (Bipolar Junction Transistor) (Correct answer)
SCR
JFET

Correct answer: BJT (Bipolar Junction Transistor)

A Bipolar Junction Transistor (BJT) has three terminals: base, collector, and emitter.

Question 76: What is strain in engineering mechanics?

Deformation per unit length (Correct answer)
Energy per unit mass
Force per unit area
Mass per unit volume

Correct answer: Deformation per unit length

Strain is the ratio of change in length to original length, representing how much a material deforms relative to its size.

Question 77: What type of wave is sound?

Transverse wave
Electromagnetic wave
Longitudinal wave (Correct answer)
Standing wave

Correct answer: Longitudinal wave

Sound is a longitudinal wave where the medium (air) vibrates parallel to the direction of wave propagation.

Question 78: What type of bond forms between atoms with high electronegativity difference?

Metallic bond
Hydrogen bond
Ionic bond (Correct answer)
Covalent bond

Correct answer: Ionic bond

Ionic bonds form when one atom donates electrons to another due to a large electronegativity difference (typically > 1.7).

Question 79: What is the integral of f(x) = 2x?

2x² + C
x + C
x² + C (Correct answer)
2 + C

Correct answer: x² + C

Integrating 2x using the power rule gives x²/1 · 2/2 = x², plus the constant of integration C.

Question 80: What does 'technical feasibility' assess in a project proposal?

The market demand for the product
Whether the technology and resources exist to accomplish the project (Correct answer)
The legal compliance of the proposed solution
The financial cost of the project

Correct answer: Whether the technology and resources exist to accomplish the project

Technical feasibility evaluates whether the required technology, expertise, and infrastructure are available to implement the proposed project.

Question 81: What is an algorithm?

A step-by-step procedure for solving a problem (Correct answer)
A type of programming language
A database management system
A hardware component

Correct answer: A step-by-step procedure for solving a problem

An algorithm is a finite, ordered set of instructions for solving a specific problem or accomplishing a task.

Question 82: A semiconductor diode allows current to flow in which direction?

From anode to cathode only (Correct answer)
It blocks current in all directions
In both directions equally
From cathode to anode only

Correct answer: From anode to cathode only

A forward-biased diode allows conventional current to flow from anode (+) to cathode (-) only.

Question 83: An NPN transistor is in saturation mode when:

Both junctions are reverse-biased
No base current is applied
Both junctions are forward-biased (Correct answer)
The base-emitter junction is forward-biased and base-collector is reverse-biased

Correct answer: Both junctions are forward-biased

In saturation, both the base-emitter and base-collector junctions are forward-biased, fully turning on the transistor.

Question 84: What does an executive summary in a technical document provide?

A list of technical terms and definitions
A brief overview of the entire document for quick reference (Correct answer)
A detailed analysis of every section
A bibliography of sources used

Correct answer: A brief overview of the entire document for quick reference

An executive summary condenses the key points of a document so decision-makers can understand the main findings without reading the full report.

Question 85: What is the purpose of a capacitor in a circuit?

To amplify electrical signals
To regulate current flow
To store electrical energy in an electric field (Correct answer)
To convert AC to DC

Correct answer: To store electrical energy in an electric field

A capacitor stores electrical energy in the electric field between its two conductive plates.

Question 86: What does Kirchhoff's Current Law (KCL) state?

Total resistance in series is the sum of individual resistances
Power dissipated equals current squared times resistance
Voltage is the same across all parallel branches
The sum of currents entering a node equals the sum of currents leaving it (Correct answer)

Correct answer: The sum of currents entering a node equals the sum of currents leaving it

KCL states that current is conserved at any node — what flows in must flow out.

Question 87: What is the primary purpose of a technical report in engineering?

To replace verbal presentations entirely
To list all equations used in a project
To demonstrate writing skills to professors
To communicate findings, methods, and conclusions clearly to a target audience (Correct answer)

Correct answer: To communicate findings, methods, and conclusions clearly to a target audience

A technical report communicates research findings, methodology, and conclusions in a structured format accessible to the intended audience.

Question 88: What does an ammeter measure and how is it connected in a circuit?

Voltage; connected in parallel
Power; connected in parallel
Current; connected in series (Correct answer)
Resistance; connected in series

Correct answer: Current; connected in series

An ammeter measures current and must be connected in series so the full circuit current flows through it.

Question 89: Which semiconductor device is primarily used for voltage regulation in circuits?

MOSFET
Zener diode (Correct answer)
LED
BJT transistor

Correct answer: Zener diode

A Zener diode is designed to operate in reverse breakdown at a specific voltage, making it ideal for voltage regulation.

Question 90: What does a flowchart represent in technical documentation?

A financial breakdown of a project
A comparison between two technologies
A step-by-step process or decision sequence using symbols and arrows (Correct answer)
A list of hardware components

Correct answer: A step-by-step process or decision sequence using symbols and arrows

Flowcharts use standardized symbols (ovals for start/end, rectangles for processes, diamonds for decisions) to map a process or algorithm.

Question 91: What is the unit of electrical resistance?

Volt (V)
Ohm (Ω) (Correct answer)
Watt (W)
Ampere (A)

Correct answer: Ohm (Ω)

Electrical resistance is measured in ohms (Ω), named after physicist Georg Simon Ohm.

Question 92: What is the difference between a class and an object in OOP?

A class stores data; an object stores methods
A class is an instance; an object is a blueprint
A class is a blueprint; an object is an instance of that class (Correct answer)
They are the same thing with different names

Correct answer: A class is a blueprint; an object is an instance of that class

A class defines the structure and behavior, while an object is a specific instance created from that class.

Question 93: What is the function of RAM in a computer?

Permanent storage for files
Processing mathematical operations
Temporary storage for currently running programs and data (Correct answer)
Managing network connections

Correct answer: Temporary storage for currently running programs and data

RAM (Random Access Memory) is volatile memory that temporarily stores data and instructions for actively running programs.

Question 94: What is the difference between a memo and a formal report?

They are the same format with different names
A report is used internally; a memo is used externally
A memo is longer and more detailed than a report
A memo is a brief internal communication; a report is a detailed formal document (Correct answer)

Correct answer: A memo is a brief internal communication; a report is a detailed formal document

Memos are short, informal documents for internal communication, while reports are comprehensive, structured documents for formal analysis.

Question 95: What is the impedance of a pure inductor with inductance L at angular frequency ω?

Z = 1/(ωC)
Z = ωL + 1/(ωC)
Z = ωL (Correct answer)
Z = R

Correct answer: Z = ωL

The inductive reactance (impedance of a pure inductor) is XL = ωL, where ω = 2πf.

Question 96: What does the Young's Modulus (E) measure?

Hardness of a material
Ductility of a material
Stiffness of a material (Correct answer)
Thermal conductivity

Correct answer: Stiffness of a material

Young's Modulus is the ratio of stress to strain and measures the stiffness (elasticity) of a material.

Question 97: Which protocol is used to send email?

FTP
SMTP (Correct answer)
DNS
HTTP

Correct answer: SMTP

SMTP (Simple Mail Transfer Protocol) is the standard protocol used for sending email messages between servers.

Question 98: What is the First Law of Thermodynamics?

Work is the product of force and displacement
Energy cannot be created or destroyed, only converted (Correct answer)
Entropy always increases in an isolated system
Heat flows from cold to hot

Correct answer: Energy cannot be created or destroyed, only converted

The First Law of Thermodynamics is the conservation of energy: total energy in a closed system remains constant.

Question 99: What is electromagnetic induction?

Generation of a magnetic field by a constant current
Alignment of magnetic dipoles in a field
Generation of an electric current by a changing magnetic field (Correct answer)
Transfer of charge between conductors

Correct answer: Generation of an electric current by a changing magnetic field

Electromagnetic induction, discovered by Faraday, is the production of an EMF (and thus current) in a conductor due to a changing magnetic flux.

Question 100: What is a compiler?

A hardware component for processing
A tool for debugging programs
A program that translates high-level source code into machine code (Correct answer)
A program that executes code line by line

Correct answer: A program that translates high-level source code into machine code

A compiler translates entire high-level source code into machine-readable binary code before execution.

Polytechnic Entrance Examination (JEECUP)

The Joint Entrance Examination Council of Uttar Pradesh (JEECUP) is India's leading polytechnic entrance exam for admission to diploma engineering programs, testing candidates on Mathematics, Engineering Fundamentals, and Computer Science.

100

Questions

150 min

Time Limit

40%

To Pass

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