Physics Practical 1 Class 9 Important Viva Questions with Answers (Vernier Calliper)

 PRACTICAL 1: To measure the area of cross section by measuring diameter of a solid cylinder with vernier callipers



VIVA VOCE:

1. Can you describe the step-by-step procedure for measuring the diameter of a solid cylinder using vernier calipers?

Ans: The procedure involves gently placing the cylinder between the jaws of the vernier calipers, ensuring it's perpendicular to the jaws, and then closing the jaws until they grip the cylinder snugly. The diameter can be read directly from the main scale and the vernier scale.

2. Why is it important to ensure that the cylinder is placed perpendicular to the jaws of the vernier calipers during measurement?

Ans:  Placing the cylinder perpendicular ensures that the diameter measurement is accurate and consistent.

3. How do you minimize parallax error while taking the reading on the vernier scale?

Ans:  To minimize parallax error, align your eye perpendicular to the vernier scale and ensure that the scale is positioned parallel to your line of sight.

4. What are the sources of potential error in this experiment, and how can they be minimized?

Ans: Potential sources of error include parallax, improper alignment of the cylinder, and inaccuracies in the vernier scale. These can be minimized by taking measurements carefully, ensuring proper alignment, and using calibrated instruments.

5. Explain how you would calculate the area of the cross-section of the cylinder using the measured diameter.

Ans: The area of the cross-section can be calculated using the formula: Area = π * (diameter/2)^2.

6. What precautions should be taken to ensure accurate measurements?

Ans:  Precautions include handling the cylinder delicately, aligning it properly within the calipers, and ensuring that the calipers are clean and calibrated.

7. Can you explain the significance of using vernier calipers over other measurement tools for this experiment?

Ans: Vernier calipers offer higher precision compared to other measurement tools, allowing for accurate readings to be taken to a fraction of a millimeter.

8. How would you verify the accuracy of the vernier calipers before beginning the measurements?

Ans: The accuracy of the vernier calipers can be verified by checking them against a known standard or by ensuring that the zero mark aligns perfectly when the jaws are closed.

9. What are the limitations of using vernier calipers for this type of measurement?

Ans: Vernier calipers have limitations in terms of the size of the objects they can measure and the precision of the measurements compared to more advanced instruments like micrometers.

10. How would you record and represent your data from this experiment?

 Data should be recorded clearly, including the diameter measurements, any relevant observations, and the calculated area of the cross-section. Graphical representation can be done using graphs or charts if necessary.

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