2nd Year Physics Practical Past Papers
Important very easy 2nd Year Physics Practical Past Papers written by Honorable Professor Asad Abbas Suib. These experiments are very helpful in the preparation of the 2nd Year Physics Practical Past Papers in Physics for the students and this is according to the Institute.
Summary and Contents:
Topics which are discussed in the notes are given below:
- PHYSICS , PRACTICAL , Time: 3.00 Hours , Marks: 30
- NOTE: The candidate will mark two experiments from Section-I and two from Section-Il
- (ii) The Examiner will allot ONE experiment out of marked experiments to perform experiment from each Section.
- SECTION-I
- 1. Find the value of "g" by oscillating mass spring system. 10
- 2. Find moment of inertia of fly wheel. 10
- 3. Find focal length of convex lens by displacement method. 10
- SECTION-II
- 4. Find resistance of galvanometer by half deflection method. 10
- 5. Find resistance of a given voltmeter. 10
- 6. Determine emf of a cell by using a potentiometer. 10
- SECTION-III
- 7. (i) Draw one graph by given data as allotted by examiner. 05
- 8. Practical Notebook + Viva Voce. 2 + 3
To find the volume of a cylinder using Vernier caliper:
- APPARATUS: Vernier caliper, solid cylinder
- PROCEDURE: I took vernier caliper, found its least count and zero error. Then I paced the given cylinder lengthwise into the lower jaws and tightened the screw of vernier scale so that jaws remained fixed. I observed the main scale reading just to the left of zero line of vernier scale. That gave me main scale reading R. Then to find fraction to be added "y"। noted which of vernier scale division coincided with any main scale division, n. I multiplied that number by least count and then added to main scale reading R. That after zero correction gave me the length of cylinder. I repeated the experiment by changing the position of cylinder three times more.
- I did the same to find out diameter and radius of the cylinder and in the end calculated volume by using this formula. Volume of the cylinder = πr^2l
- OBSERVATIONS: Vernier Constant (V.C) Vernier constant / Least count = Value of 1 smallest division on main scale / Total number of divisions on vernier scale
- Vernier constant / Least count = 0.1 cm / 10 = 0.01cm
- Precautions: (i). Zero correction should be applied. (ii). Record and number of observation and find the mean. (iii). The vernier should be screwed in position before removing the cylinder from the gap. (iv). Jaws of the Clippers should not be pressent to hard.
- VIVA VOCE:
- Q: What is vernier constant? Ans: Vernier constant = Value of 1 smallest division on Main scale / No.of divisions on Vernier scale , Vernier constant = 0.1cm / 10 = 0.01cm
- Q: What is meant by least count of vernier caliper? Ans: The minimum measurement which can be made by the vernier calipers is called Least count or vernier constant. Its value is 0.01cm.
- Q: Write formula to find the volume of the cylinder. Ans: Volume of the cylinder can be determined by using the formula: ν = πr²l
- Q: What is zero error? Ans: If Main scale zero and vernier scale zero does not coincide when the jaws are closed then the error occurring in measurement is called zero error.
- Q: What is the use of the upper jaws and the sliding strip of the vernier caliper? Ans: Upper jaws of the vernier calipers are used to measure internal diameter and siding strip measures the depth of any tube.
- Q: What is zero correction? Ans: To add or subtract the zero error in the observed reading is called zero correction.
- Q: If vernier scale has 20 divisions and smallest division on the main scale is 0.1 cm then find the least count of the vernier caliper. Ans: Least count = Value of 1 smallest division on Main scale / No.of divisions on Vernier scale. Least count = 0.1cm / 20 = 0.005cm
- Q: What are the various uses of vernier caliper? Ans: Vernier calipers are used to measure diameter of a cylinder or sphere, length of a cylinder, internal diameter and depth of a tube.