ISC 2016 Physics Practical Question Paper for Class 12

About this paper

This is ISC Class 12 Physics Paper 2 (Practical), set by CISCE for the 2016 examination (paper code 861 B). It carries 30 marks and runs for three hours plus fifteen minutes of reading time, with no more than one and a half hours to be spent on each experiment. Question 1 finds the resistivity of a specimen wire using the Wheatstone bridge principle: balancing lengths on a metre bridge for six resistance-box values, a graph whose slope S is found, and the wire's diameter from a micrometer screw gauge. Question 2 finds the focal length of a convex lens by the no parallax method for object distances from 60 cm down to 20 cm. Question 3 is the assessment of the project and practical file by the Visiting Examiner.

Exam

ISC Class 12

Subject

Physics Practical

Year

2016

Paper code

861 B

Maximum marks

30

Time allowed

3 hours + 15 min reading

Questions

3

Pages

4

Answers included

No, questions only

Paper pattern

• Question 1

  12 marks

  Resistivity of a wire by the Wheatstone bridge principle, with a graph and a screw gauge measurement (10 + 2 marks)

• Question 2

  8 marks

  Focal length of a convex lens by the no parallax method, five object distances

• Question 3

  10 marks

  Project (7 marks) and Physics practical file (3 marks) shown to the Visiting Examiner

Topics covered

• Wheatstone bridge and metre bridge
• Resistivity of a wire
• Micrometer screw gauge
• Focal length of a convex lens
• No parallax method
• Graph plotting and slope of the line of best fit
• Project and practical file

Questions from this paper

1. Set up the metre bridge circuit with a 2 V source, take out a 1 Ω plug from the resistance box and find the balancing length l at which the galvanometer shows no deflection, correct to one decimal place.
2. Repeat the experiment to obtain five more values of l with x = 2 Ω, 3 Ω, 4 Ω, 5 Ω and 6 Ω, plot the graph, draw the line of best fit and determine its slope S.
3. Determine the least count of the screw gauge in mm and use it to find the diameter d of the specimen wire W.
4. With the object pin at the 0 cm mark and the lens at the 60.0 cm mark, remove the parallax and determine the image distance v correct to one decimal place.
5. For u = 60 cm, 50 cm, 40 cm, 30 cm and 20 cm, calculate p = uv, q = u + v and f = p/q, and find F, the mean of the five values of f.