Physics Class 9 Practical 17 Important Viva Questions with Answers (archimedes' principle )

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 the body is calculated from the loss in weight, and the density is found by dividing the mass of the body by its volume.

Q5: What formula is used to calculate the density of the body?



Q6: How do you calculate the apparent loss in weight when the body is submerged in water?

A6: The apparent loss in weight is calculated as the difference between the weight of the body in air and the weight of the body when submerged in water.

Q7: Why is the apparent loss in weight equal to the weight of the water displaced?

A7: The apparent loss in weight is equal to the weight of the water displaced because the buoyant force acting on the submerged body is equal to the weight of the displaced fluid.

Q8: What equipment is required for this experiment?

A8: The equipment required includes a balance to measure weight, a container filled with water, a string to submerge the body, and a measuring cylinder to catch displaced water.

Q9: How do you ensure accuracy in your measurements?

A9: Accuracy can be ensured by using a precise balance, avoiding splashing while submerging the body, ensuring the body is fully submerged without touching the container walls, and taking multiple readings.

Q10: What is the significance of the density obtained from this experiment?

A10: The density obtained helps identify the material of the body and is a fundamental property that describes how much mass is contained in a given volume.

Q11: What are the potential sources of error in this experiment?

A11: Potential sources of error include inaccurate measurement of mass, air bubbles sticking to the body, water adhering to the body when removed from the container, and not completely submerging the body.

Q12: How can you minimize these errors?

A12: Errors can be minimized by carefully drying the body before weighing it in air, ensuring no air bubbles on the surface during submersion, taking care to avoid water splashing, and using calibrated instruments.

Q13: What is the relationship between mass, volume, and density?

A13: The relationship is given by the formula \( \rho = \frac{m}{V} \), where \( \rho \) is the density, \( m \) is the mass, and \( V \) is the volume.

Q14: Can Archimedes' principle be applied to liquids other than water?

A14: Yes, Archimedes' principle can be applied to any fluid, but the fluid's density must be known to calculate the buoyant force and volume of the displaced fluid accurately.

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