Polytechnic Entrance Examination (JEECUP) — Questions and Answers

Question 1: What is the Doppler Effect?

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
The reflection of sound off surfaces

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

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

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 3: What is the function of a rectifier circuit in power supplies?

Amplifies AC signals
Converts DC to AC
Converts AC to DC (Correct answer)
Regulates output voltage

Correct answer: Converts AC to DC

A rectifier converts AC (alternating current) to DC (direct current) using diodes to allow only one polarity.

Question 4: What is a primary key in a relational database?

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

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

1/2
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 6: What does OOP stand for in programming?

Object-Oriented Programming (Correct answer)
Open-Oriented Programming
Optimized Object Processing
Output-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 7: What does CPU stand for?

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

Correct answer: Central Processing Unit

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

Question 8: 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 9: What is the pH of a neutral solution at 25°C?

1
0
7 (Correct answer)
14

Correct answer: 7

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

Question 10: What is the First Law of Thermodynamics?

Work is the product of force and displacement
Entropy always increases in an isolated system
Energy cannot be created or destroyed, only converted (Correct answer)
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 11: Which type of transistor uses a base, collector, and emitter terminal?

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

Correct answer: BJT (Bipolar Junction Transistor)

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

Question 12: 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 13: What is the IEEE citation style commonly used for?

Electrical engineering and computer science publications (Correct answer)
Biological and medical sciences
Social sciences and humanities
Legal and policy documents

Correct answer: Electrical engineering and computer science publications

IEEE citation style is the standard format used by the Institute of Electrical and Electronics Engineers for technical publications.

Question 14: What type of bond forms between atoms with high electronegativity difference?

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

Correct answer: Ionic bond

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

Question 15: Which conic section is defined by the equation x² + y² = r²?

Ellipse
Hyperbola
Parabola
Circle (Correct answer)

Correct answer: Circle

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

Question 16: What is the formula for the area of a circle?

πd
r²
πr² (Correct answer)
2πr

Correct answer: πr²

The area of a circle is πr², where r is the radius.

Question 17: What is the unit of electrical resistance?

Henry
Farad
Siemens
Ohm (Correct answer)

Correct answer: Ohm

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

Question 18: 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 19: What is the unit of electrical resistance?

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

Correct answer: Ohm (Ω)

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

Question 20: What is the Second Law of Thermodynamics?

Energy is conserved in all processes
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)

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 21: What is the molecular formula of water?

HO
HO₂
H₂O (Correct answer)
H₂O₂

Correct answer: H₂O

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

Question 22: What is recursion in programming?

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

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 23: What does the Fundamental Theorem of Calculus connect?

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

Correct answer: Differentiation and integration

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

Question 24: 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 25: An NPN transistor is in saturation mode when:

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
Both junctions are 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 26: What does HTTP stand for?

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

Correct answer: HyperText Transfer Protocol

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

Question 27: What is the unit of frequency?

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

Correct answer: Hertz (Hz)

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

Question 28: 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 text strings
A data type for decimal numbers

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

Zener diode (Correct answer)
BJT transistor
LED
MOSFET

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

They are the same format with different names
A memo is longer and more detailed than a report
A report is used internally; a memo is used externally
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.

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.

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40 min

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40%

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