Previous Year Question Paper Of PU

Previous year question papers of PU are a great resource for students to prepare for exams. These papers help students understand the exam pattern, types of questions, and difficulty level. This guide provides questions and answers for various subjects, helping students practice and strengthen their knowledge for better exam preparation.

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Physics

Question: What is Newton’s second law of motion?
Answer: Newton’s second law states that the force acting on an object is equal to the mass of that object times its acceleration.

Question: What is the difference between speed and velocity?
Answer: Speed is the rate at which an object covers distance, while velocity is speed with a specified direction.

Question: Define potential energy.
Answer: Potential energy is the energy stored in an object due to its position relative to other objects.

Question: What is the law of conservation of energy?
Answer: The law states that energy cannot be created or destroyed, only transferred or transformed from one form to another.

Question: What is Ohm’s Law?
Answer: Ohm’s Law states that the current through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance.

Question: What is the unit of electric current?
Answer: The unit of electric current is the ampere.

Question: Explain the Doppler effect.
Answer: The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer moving relative to the wave source.

Question: What is the principle behind the working of a transformer?
Answer: A transformer works on the principle of electromagnetic induction to transfer electrical energy between circuits.

Question: What are scalar and vector quantities?
Answer: Scalar quantities have only magnitude, while vector quantities have both magnitude and direction.

Question: What is refraction of light?
Answer: Refraction is the bending of light as it passes from one medium to another with different densities.

Question: Define thermal conductivity.
Answer: Thermal conductivity is the property of a material that allows heat to pass through it.

Question: What is the first law of thermodynamics?
Answer: The first law of thermodynamics states that the total energy of an isolated system is constant; energy can be transformed from one form to another but cannot be created or destroyed.

Question: What is the formula for calculating kinetic energy?
Answer: The formula for kinetic energy is KE=(1/2)mv², where m is mass and v is velocity.

Question: What is absolute zero?
Answer: Absolute zero is the theoretical lowest temperature, 0 Kelvin, where all molecular motion ceases.

Question: Define capacitance.
Answer: Capacitance is the ability of a system to store an electric charge.

Question: What is the speed of light in a vacuum?
Answer: The speed of light in a vacuum is approximately 3.00×10⁸ meters per second.

Question: What is the difference between concave and convex lenses?
Answer: A concave lens diverges light rays, while a convex lens converges them.

Question: Explain the principle of Archimedes.
Answer: Archimedes’ principle states that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.

Question: What is electromotive force (EMF)?
Answer: EMF is the voltage generated by a source like a battery when no current flows through the circuit.

Question: What is nuclear fusion?
Answer: Nuclear fusion is the process where two light atomic nuclei combine to form a heavier nucleus, releasing energy.

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Chemistry

Question: What is the atomic number?
Answer: The atomic number is the number of protons in the nucleus of an atom.

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

Question: What is Avogadro’s number?
Answer: Avogadro’s number is 6.022×10²³, the number of atoms or molecules in one mole of a substance.

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

Question: What is the law of conservation of mass?
Answer: The law states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.

Question: Define covalent bond.
Answer: A covalent bond is a chemical bond formed when two atoms share electrons.

Question: What are acids and bases?
Answer: Acids are substances that donate protons (H+ ions) in a solution, while bases are substances that accept protons.

Question: What is a chemical equilibrium?
Answer: Chemical equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction in a chemical process.

Question: Define molarity.
Answer: Molarity is the concentration of a solution expressed as moles of solute per liter of solution.

Question: What is electrolysis?
Answer: Electrolysis is the process of using electricity to drive a non-spontaneous chemical reaction.

Question: Explain oxidation and reduction.
Answer: Oxidation is the loss of electrons, while reduction is the gain of electrons in a chemical reaction.

Question: What is a catalyst?
Answer: A catalyst is a substance that speeds up a chemical reaction without being consumed in the process.

Question: Define entropy.
Answer: Entropy is a measure of the disorder or randomness in a system.

Question: What is an ionic bond?
Answer: An ionic bond is formed by the electrostatic attraction between oppositely charged ions.

Question: What is the periodic table?
Answer: The periodic table is a tabular arrangement of elements, ordered by increasing atomic number.

Question: What is a valence electron?
Answer: A valence electron is an electron that is associated with an atom and can participate in the formation of a chemical bond.

Question: What is the ideal gas law?
Answer: The ideal gas law is expressed as PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.

Question: What is the difference between endothermic and exothermic reactions?
Answer: Endothermic reactions absorb heat, while exothermic reactions release heat.

Question: What is the chemical formula for water?
Answer: The chemical formula for water is H₂O.

Question: What is the law of multiple proportions?
Answer: The law states that when two elements form more than one compound, the mass ratios of the second element combine with a fixed mass of the first element in whole number ratios.

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Biology

Question: What is photosynthesis?
Answer: Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into glucose and oxygen.

Question: Define cell.
Answer: A cell is the basic structural and functional unit of all living organisms.

Question: What is DNA?
Answer: DNA (Deoxyribonucleic acid) is the molecule that carries genetic information in living organisms.

Question: What is the function of the mitochondria?
Answer: Mitochondria are the powerhouses of the cell, responsible for producing energy through respiration.

Question: What are enzymes?
Answer: Enzymes are biological catalysts that speed up chemical reactions in cells.

Question: Define osmosis.
Answer: Osmosis is the movement of water molecules through a semi-permeable membrane from a region of low solute concentration to a region of high solute concentration.

Question: What is the role of chlorophyll?
Answer: Chlorophyll is the pigment in plants that absorbs light energy for photosynthesis.

Question: What is an ecosystem?
Answer: An ecosystem is a community of living organisms interacting with their physical environment.

Question: What is the human circulatory system?
Answer: The circulatory system is responsible for transporting blood, oxygen, and nutrients throughout the body.

Question: What is mitosis?
Answer: Mitosis is the process by which a cell divides to produce two genetically identical daughter cells.

Question: What is a gene?
Answer: A gene is a segment of DNA that encodes instructions for the development and functioning of an organism.

Question: What is biodiversity?
Answer: Biodiversity refers to the variety of life forms on Earth, including different species, ecosystems, and genetic diversity.

Question: Define respiration.
Answer: Respiration is the process by which organisms convert glucose and oxygen into energy, carbon dioxide, and water.

Question: What is a food chain?
Answer: A food chain is a sequence of organisms that eat each other, showing the flow of energy from one organism to another.

Question: What is a mutation?
Answer: A mutation is a change in the DNA sequence of an organism.

Question: What are the primary functions of the liver?
Answer: The liver detoxifies harmful substances, produces bile, and stores glycogen for energy.

Question: What is the role of the nervous system?
Answer: The nervous system controls and coordinates the body’s activities and responses to internal and external stimuli.

Question: What is the process of digestion?
Answer: Digestion is the breakdown of food into smaller molecules that can be absorbed and utilized by the body.

Question: What is homeostasis?
Answer: Homeostasis is the maintenance of a stable internal environment in an organism despite external changes.

Question: Define hormones.
Answer: Hormones are chemical messengers produced by glands that regulate various bodily functions.

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Mathematics

Question: What is the Pythagorean theorem?
Answer: The Pythagorean theorem states that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

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

Question: What is the area of a circle?
Answer: The area of a circle is πr², where r is the radius of the circle.

Question: What is the value of pi?
Answer: The value of pi is approximately 3.14159.

Question: What is a fraction?
Answer: A fraction represents a part of a whole, expressed as the ratio of two integers.

Question: What is the difference between mean and median?
Answer: Mean is the average of a set of numbers, while median is the middle value when the numbers are arranged in order.

Question: Define a quadratic equation.
Answer: A quadratic equation is a second-degree polynomial equation in the form ax²+bx+c=0.

Question: What is the formula for the perimeter of a rectangle?
Answer: The perimeter of a rectangle is 2(l+w), where l is the length and w is the width.

Question: What is an integer?
Answer: An integer is a whole number that can be positive, negative, or zero.

Question: What is a probability?
Answer: Probability is the measure of the likelihood that an event will occur.

Question: What is a tangent?
Answer: A tangent is a straight line that touches a curve at exactly one point without crossing it.

Question: Define slope in geometry.
Answer: The slope is the measure of the steepness or incline of a line, calculated as the ratio of the rise to the run.

Question: What is a rational number?
Answer: A rational number is a number that can be expressed as a fraction of two integers.

Question: What is the formula for the volume of a cylinder?
Answer: The volume of a cylinder is πr²h, where r is the radius and h is the height.

Question: What is an algebraic expression?
Answer: An algebraic expression is a mathematical phrase that includes numbers, variables, and operators.

Question: Define a right angle.
Answer: A right angle is an angle of 90 degrees.

Question: What is a polygon?
Answer: A polygon is a closed two-dimensional shape with straight sides.

Question: What is a linear equation?
Answer: A linear equation is an equation that forms a straight line when graphed, typically written in the form y=mx+b.

Question: What is the difference between permutations and combinations?
Answer: Permutations are arrangements of objects where order matters, while combinations are selections of objects where order does not matter.

Question: What is an isosceles triangle?
Answer: An isosceles triangle is a triangle with two sides of equal length.