PU Previous Year Question Papers With Solutions PDF

PU (Panjab University) exams require a thorough understanding of the subject matter. One of the best ways to prepare is by reviewing previous year question papers. Here, students can access a variety of important questions and their solutions across different subjects to enhance their learning and revision process.

Physics Questions and Answers

Question: What is Newton’s second law of motion?

Answer: Newton’s second law states that the rate of change of momentum of an object is directly proportional to the net force applied and occurs in the direction of the applied force.

Question: What is the unit of electric charge?

Answer: The SI unit of electric charge is the coulomb (C).

Question: Define the concept of potential energy.

Answer: Potential energy is the energy stored in an object due to its position relative to other objects or its configuration.

Question: State Ohm’s law.

Answer: Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Question: What is the difference between AC and DC?

Answer: AC (Alternating Current) changes its direction periodically, while DC (Direct Current) flows in one constant direction.

Question: Define the term ‘velocity.’

Answer: Velocity is the rate of change of an object’s position with respect to time and includes both speed and direction.

Question: What is the first law of thermodynamics?

Answer: The first law of thermodynamics states that energy cannot be created or destroyed, only transferred or converted from one form to another.

Question: What is Coulomb’s law?

Answer: Coulomb’s law describes the electrostatic force between two charged particles, stating that the force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

Question: Explain the photoelectric effect.

Answer: The photoelectric effect refers to the emission of electrons from a material when it is exposed to light of a certain frequency.

Question: What is the difference between mass and weight?

Answer: Mass is the amount of matter in an object, while weight is the force exerted on an object due to gravity.

Question: Define the term ‘refraction.’

Answer: Refraction is the bending of light as it passes from one medium into another of different density.

Question: What is Hooke’s law?

Answer: Hooke’s law states that the force needed to extend or compress a spring by some distance is proportional to that distance.

Question: Explain the concept of inertia.

Answer: Inertia is the property of an object to resist any change in its state of motion unless acted upon by an external force.

Question: What is a wave?

Answer: A wave is a disturbance that transfers energy from one place to another, often described in terms of frequency, wavelength, and amplitude.

Question: Define centripetal force.

Answer: Centripetal force is the force that keeps an object moving in a circular path and is directed towards the center of the circle.

Question: What is an electric field?

Answer: An electric field is a region around a charged object where an electric force is exerted on other charged objects.

Question: Explain the concept of magnetic flux.

Answer: Magnetic flux is the total magnetic field passing through a given area and is measured in Weber (Wb).

Question: Define resonance in physics.

Answer: Resonance occurs when a system is driven at its natural frequency, resulting in maximum energy transfer and amplification of oscillations.

Question: What is the principle of conservation of momentum?

Answer: The principle of conservation of momentum states that in a closed system, the total momentum before and after a collision remains constant.

Chemistry Questions and Answers

Question: What is the atomic number?

Answer: The atomic number of an element is the number of protons present in the nucleus of its atom.

Question: Define the pH scale.

Answer: The pH scale is a measure of the acidity or alkalinity of a solution, ranging from 0 to 14, with 7 being neutral.

Question: What is a covalent bond?

Answer: A covalent bond is a chemical bond formed by the sharing of electron pairs between atoms.

Question: Explain the law of conservation of mass.

Answer: The law of conservation of mass states that mass in a closed system remains constant, meaning mass cannot be created or destroyed in a chemical reaction.

Question: What is an electrolyte?

Answer: An electrolyte is a substance that produces ions when dissolved in water and conducts electricity.

Question: Define the term ‘oxidation.’

Answer: Oxidation is the loss of electrons by a molecule, atom, or ion during a chemical reaction.

Question: What is the periodic table?

Answer: The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties.

Question: Define Avogadro’s law.

Answer: Avogadro’s law states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules.

Question: What is a chemical reaction?

Answer: A chemical reaction is a process that leads to the transformation of one set of chemical substances into another.

Question: What are isotopes?

Answer: Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons.

Question: Explain the process of electrolysis.

Answer: Electrolysis is a chemical process that uses an electric current to drive a non-spontaneous chemical reaction, typically the decomposition of compounds.

Question: What is molarity?

Answer: Molarity is the concentration of a solution, measured as the number of moles of solute per liter of solution.

Question: What is a catalyst?

Answer: A catalyst is a substance that speeds up the rate of a chemical reaction without being consumed in the process.

Question: What is a mole in chemistry?

Answer: A mole is a unit in chemistry used to measure the amount of substance, equivalent to 6.022 x 10²³ particles (atoms, molecules, ions).

Question: Define the term ‘acid.’

Answer: An acid is a substance that donates protons (H⁺ ions) in a chemical reaction and has a pH less than 7.

Question: What is a base?

Answer: A base is a substance that accepts protons or donates electron pairs and has a pH greater than 7.

Question: Explain the concept of equilibrium in chemistry.

Answer: Chemical equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction, resulting in no net change in the concentration of reactants and products.

Question: What is the octet rule?

Answer: The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons, achieving a stable electron configuration similar to noble gases.

Question: What is a redox reaction?

Answer: A redox reaction is a chemical reaction that involves the transfer of electrons between two species, where one undergoes oxidation and the other reduction.

Mathematics Questions and Answers

Question: What is the Pythagorean theorem?

Answer: The Pythagorean theorem states that in a right-angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.

Question: What is a prime number?

Answer: A prime number is a natural number greater than 1 that has no divisors other than 1 and itself.

Question: Define the term ‘perimeter.’

Answer: The perimeter is the total distance around the boundary of a two-dimensional shape.

Question: What is the quadratic formula?

Answer: The quadratic formula is used to find the solutions of a quadratic equation and is given by x = (-b ± √(b² – 4ac)) / 2a.

Question: What is the value of pi (π)?

Answer: The value of pi (π) is approximately 3.14159, representing the ratio of the circumference of a circle to its diameter.

Question: Define the term ‘factorial.’

Answer: A factorial, denoted by n!, is the product of all positive integers less than or equal to a given number n.

Question: What is an integer?

Answer: An integer is any whole number, positive, negative, or zero, that does not have a fractional or decimal part.

Question: Define a linear equation.

Answer: A linear equation is an equation that makes a straight line when plotted on a graph and can be written in the form y = mx + c.

Question: What is the area of a circle?

Answer: The area of a circle is given by the formula A = πr², where r is the radius of the circle.

Question: What is the sum of the angles in a triangle?

Answer: The sum of the interior angles of a triangle is always 180 degrees.

Question: Define probability.

Answer: Probability is the measure of the likelihood that an event will occur, calculated as the ratio of favorable outcomes to the total number of possible outcomes.

Question: What is the mean of a data set?

Answer: The mean, or average, of a data set is the sum of all the values divided by the number of values.

Question: What is a rational number?

Answer: A rational number is a number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.

Question: Define the term ‘median.’

Answer: The median is the middle value in a data set when the values are arranged in ascending or descending order.

Question: What is the mode of a data set?

Answer: The mode is the value that appears most frequently in a data set.

Question: What is an arithmetic sequence?

Answer: An arithmetic sequence is a sequence of numbers in which the difference between consecutive terms is constant.

Question: Define the term ‘circumference.’

Answer: The circumference is the total distance around the edge of a circle, calculated as C = 2πr.

Question: What is a polygon?

Answer: A polygon is a two-dimensional shape with straight sides, and the sides are closed, meaning they form a complete loop.

Question: Define the term ‘exponent.’

Answer: An exponent refers to the number that indicates how many times a base number is multiplied by itself.

English Questions and Answers

Question: What is a noun?

Answer: A noun is a word that names a person, place, thing, or idea.

Question: Define the term ‘verb.’

Answer: A verb is a word that expresses an action, occurrence, or state of being.

Question: What is the difference between active and passive voice?

Answer: In active voice, the subject performs the action, while in passive voice, the subject receives the action.

Question: What is a conjunction?

Answer: A conjunction is a word used to connect words, phrases, or clauses (e.g., and, but, or).

Question: Define the term ‘adjective.’

Answer: An adjective is a word that describes or modifies a noun or pronoun.

Question: What is an adverb?

Answer: An adverb is a word that modifies a verb, adjective, or other adverb, often ending in -ly.

Question: What is a preposition?

Answer: A preposition is a word used to show the relationship of a noun or pronoun to another word in a sentence.

Question: Define the term ‘subject’ in grammar.

Answer: The subject of a sentence is the person, place, thing, or idea that is doing or being something.

Question: What is a predicate?

Answer: The predicate is the part of a sentence that tells what the subject does or is.

Question: What is a synonym?

Answer: A synonym is a word that has the same or nearly the same meaning as another word.

Question: What is the difference between ‘their’ and ‘there’?

Answer: ‘Their’ is a possessive pronoun, while ‘there’ refers to a place or position.

Question: Define the term ‘pronoun.’

Answer: A pronoun is a word used in place of a noun to avoid repetition.

Question: What is a sentence?

Answer: A sentence is a group of words that expresses a complete thought, usually consisting of a subject and a predicate.

Question: Define the term ‘clause.’

Answer: A clause is a group of words that contains a subject and a verb and forms part of a sentence.

Question: What is an interjection?

Answer: An interjection is a word or phrase used to express sudden emotion or feeling.

Question: What is the function of a comma in a sentence?

Answer: A comma is used to separate elements in a sentence, such as items in a list, clauses, or adjectives.

Question: Define the term ‘homophone.’

Answer: Homophones are words that sound the same but have different meanings and spellings.

Question: What is the difference between ‘it’s’ and ‘its’?

Answer: ‘It’s’ is a contraction of ‘it is’ or ‘it has,’ while ‘its’ is a possessive pronoun.

Question: What is a direct object?

Answer: A direct object is the noun or pronoun that receives the action of the verb.

Question: What is an indirect object?

Answer: An indirect object is the noun or pronoun that receives the direct object.