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Physics Practical 19 Class 9, 10: Important Viva Voce Questions with Answers : To find the specific heat by the method of mixture using polystyrene cups (used as container of negligible heat capacity).

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  PRACTICAL 19 To find the specific heat by the method of mixture using polystyrene cups (used as container of negligible heat capacity).   VIVA VOCE 1. What is the principle behind the method of mixtures for determining specific heat? Ans:  The principle is based on the law of conservation of energy, where the heat lost by the hot substance is equal to the heat gained by the cold substance, assuming no heat is lost to the surroundings. 2. Why are polystyrene cups used as containers in this experiment? Ans:  Polystyrene cups are used because they have negligible heat capacity and good thermal insulation properties, minimizing heat exchange with the surroundings. 3.  What is specific heat capacity? Ans:  Specific heat capacity is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius. 4. Why is it important to ensure that the heat capacity of the container is negligible? Ans:  Ensuring the heat capacity of the container is negligible helps
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The Sumerians

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  The Sumerians were one of the earliest known civilizations in Mesopotamia, thriving from around 4500 BCE to 1900 BCE. Here are some key points about the Sumerians: Formed : The Sumerian civilization emerged around 4500 BCE in the southern region of Mesopotamia, located in present-day Iraq. City-States : Sumerians established some of the world's earliest known city-states, including Ur, Uruk, Eridu, Lagash, and Nippur. These city-states were independent political entities with their own governments, economies, and religious institutions. Rulers : Sumerian city-states were typically ruled by kings (lugals) who held both political and religious authority. Some famous rulers include Gilgamesh of Uruk and Ur-Nammu of Ur, known for their achievements and contributions to Sumerian culture. Region : The Sumerians inhabited the southern part of Mesopotamia, between the Tigris and Euphrates rivers, known as the fertile crescent. This region provided fertile land for agriculture and trade r
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Physics Class 10 Practical 18 Important Viva Questions with Answers (density of liquid using syringe )

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  PRACTICAL 18 To find the density of a liquid using 5 ml syringe (instead of density bottle). VIVA VOCE Q1: What is the aim of the experiment? A1: The aim of the experiment is to find the density of a liquid using a 5 ml syringe instead of a density bottle. Q2: What is the basic principle used to determine the density of a liquid in this experiment? A2: The basic principle involves measuring the mass of a known volume of the liquid and then calculating its density using the formula \( \rho = \frac{m}{V} \), where \( \rho \) is density, \( m \) is mass, and \( V \) is volume. Q3: Describe the procedure of the experiment briefly. A3: The procedure involves the following steps: 1. Weigh an empty 5 ml syringe. 2. Fill the syringe with the liquid up to the 5 ml mark. 3. Weigh the syringe filled with the liquid. 4. Calculate the mass of the liquid by subtracting the mass of the empty syringe from the mass of the filled syringe. 5. Calculate the density using the mass and the known volume (5
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Physics Class 9 Practical 17 Important Viva Questions with Answers (archimedes' principle )

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PRACTICAL 17 To find the density of a body heavier than water by Archimedes principle. VIVA VOCE   Viva Questions and Answers for Finding Density Using Archimedes' Principle Q1: What is the aim of the experiment? A1: The aim of the experiment is to find the density of a body heavier than water using Archimedes' principle. Q2: What is Archimedes' principle? A2: Archimedes' principle states that when a body is fully or partially submerged in a fluid, it experiences an upward buoyant force equal to the weight of the fluid displaced by the body. Q3: How do you determine the volume of the body using Archimedes' principle? A3: The volume of the body is determined by measuring the volume of water displaced when the body is submerged in water, which is equal to the volume of the body. Q4: Describe the procedure of the experiment briefly. A4:The procedure involves weighing the body in air, then submerging it in water and measuring the apparent loss in weight. The volume of t
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Physics Class 9 Practical 16 Important Viva Questions with Answers (helical spring )

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PRACTICAL 16 To study the relationship between load and extension (Helical spring) by drawing a graph. VIVA VOCE   Q1: What is the aim of the experiment? A1:The aim of the experiment is to study the relationship between load and extension in a helical spring by drawing a graph. Q2: What is Hooke's Law? A2:Hooke's Law states that the extension of a spring is directly proportional to the load applied to it, provided the elastic limit is not exceeded. Q3: How do you calculate the spring constant (k)? A3:The spring constant (k) is calculated using the formula \( k = \frac{F}{x} \), where \( F \) is the load applied and \( x \) is the extension produced. Q4: What is the elastic limit? A4:The elastic limit is the maximum load that a spring can bear without undergoing permanent deformation. Q5: Describe the procedure of the experiment briefly. A5:The procedure involves hanging the helical spring vertically, adding known weights incrementally, measuring the corresponding extensions, an
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Physics Class 10 Practical 15 Important Viva Questions with Answers (time period of simple pendulum )

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  PRACTICAL 15 To prove that time period of a simple pendulum is independent of (i) mass of the pendulum (ii) amplitude of the vibration. VIVA VOCE 1.  What is the objective of the experiment?    Ans: The objective is to demonstrate that the time period of a simple pendulum remains constant irrespective of changes in its mass and amplitude. 2.  How is the time period of a pendulum defined?   Ans: The time period (T) of a pendulum is the time taken for one complete oscillation, i.e., the time it takes for the pendulum to return to its starting position. 3.  Explain how you varied the mass of the pendulum during the experiment.  Ans: We kept the length and amplitude of the pendulum constant while changing the mass by attaching different weights at the bottom of the pendulum bob. 4. What did you observe when you changed the mass of the pendulum? Ans: Despite changing the mass, we observed that the time period of the pendulum remained constant. 5.  Why does the time period remain constant
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Physics Class 9 Practical 14 Important Viva Questions with Answers (simple pendulum)

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PRACTICAL 14 To study the effect of the length of simple pendulum on time and hence find the value of g by calculation VIVA VOCE 1. What is the objective of this experiment? Ans: The objective is to study the effect of the length of a simple pendulum on its time period and to calculate the acceleration due to gravity (g). 2. Describe the setup of this experiment. Ans: The setup typically involves suspending a small mass (pendulum bob) from a string of variable length and allowing it to oscillate freely. 3. How does the length of the pendulum affect its time period? Ans: The time period of a pendulum is directly proportional to the square root of its length. Longer pendulums have longer time periods, and vice versa. 4. What measurements are needed for this experiment? Ans: We need to measure the length of the pendulum and the time taken for a certain number of oscillations (usually a fixed number like 10 or 20). 5. How will you conduct the experiment to find the time period? Ans: We wil
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