Measurement Of Length :

Experiment 1 (b) : Vernier Caliper Basics  

Viva-Voce [Volume Of Cylinder & Sphere Using Vernier Calipers]

 Question. 1. Why is a slide calipers called a Vernier Calipers ?

Answer. Because it was rst designed by a French mathematician, Pierre Vernier.

Question.2. What is the principle of a vernier scale ?

Answer. The number of vernier scale divisions coinciding with main scale divisions should either be one less or one more.

Question.3. Define vernier constant ?

Answer. It is the difference between value of one main scale division and one vernier scale division of a vernier callipers.

Question.4. Define least count of a measuring instrument ?

Answer. It is the least quantity that the instrument can measure accurately. (For a vernier calipers, its. least count is equal to vernier constant.)

Question.5. Give least counts of a meter scale, vernier calipers, screw gauge and a spherometer ?

Answer. Meter scale (1 mm), vernier calipers (0.1 mm),

Question.6. screw gauge and spherometer (0.01 mm). What is a zero error ? Answer. It is the error in the vernier calipers, if the zeros of the main scale and vernier scale do not coincide when the lower jaws are in contact.

Question.7. How does zero error arise in the instrument ?

Answer. It arises due to wear and tear of the instrument caused by its long use.

Question.8. When is zero error positive and when is it negative ?

Answer. Zero error is positive when vernier zero is to the right of main scale zero and negative if it is to the left.

Question.10. What is zero correction ? How is it applied  ? Answer. Negative of zero error is zero correction. It is algebraically added to the observed reading.  Question.11. What is the utility of vernier scale over meter scale ? Answer. It increases the accuracy of measurement.  

Question.12. What are other measurements that can be made by a vernier callipers ?

Answer. The calipers jaws are used  for measuring internal diameter of hollow cylinder or calorimeter. The thin metallic strip attached to the back side of the main scale  is used  for measuring depth  of a vessel.

Question.13. Can we measure the thickness of a piece of paper  by vernier calipers ?

Answer. No.  

Question.14. What is the least count  of your laboratory vernier calipers ?

Answer. The least count  is 0.01 cm.  

Question. 15. What is an angular  vernier ?

Answer. An angular  vernier is used  for measuring fraction of a degree of an angle. It is provided in sextants and spectrometers, which measure angular  displacements.    

Importance Of The Practicals Physics is one of the most important subjects in Class 12. As the CBSE exam approaches, students get busy preparing for different subjects. But an essential part of the CBSE exam is the practical exams which consist of 30 marks. Students must know all the experiments along with theorems, laws, and numerical to understand all the concepts of 12th standard physics in a detailed way. Two experiments (8 + 8 marks) are asked from each section in the practical exam. The experiment records and activities consist of 6 marks, the project has 3 marks and viva on the experiment consist of 5 marks. The Physics Practicals For Class 12 CBSE is given here so that students can understand the experiments in a better way. Students are suggested to study the theory and law behind the experiment properly before performing the experiment.Also Go through the viva voce questions and answers for each and every experiment which are provided on the website .