ICSE Class 9 Physics Experiments has a massive significance in the learning process. It engages students, helping them to develop essential skills and promote the development of scientific thinking. The list of Physics experiments provided below allows students to conduct investigations, ask questions and collect data. Students learn the concept of Physics in a more effective way by doing the experiments than merely learning from the Physics textbook in classrooms.

The Physics experiments of ICSE Class 9 mentioned in the lab manual are prescribed by the Board so that students can understand the concepts and ace their Physics exam. Along with the theory part, Physics practical is also crucial for students of ICSE Class 9 to prepare adequately.

### ICSE Class 9 Physics Practical Syllabus

The practical should also be taught alongside theory syllabus so that students can understand the difficult concepts easily. In Class 9 Physics, students need to participate in a total number of 12 experiments mentioned in the practical syllabus. The Internal Assessment of practical work will be assigned 20 marks. The list of all the Physics experiments is mentioned below:

#### List of experiments for ICSE Class 9 Physics Practical

1. Determine the least count of the Vernier callipers and measure the length and diameter of a small cylinder (average of three sets) – may be a metal rod of length 2 to 3 cm and diameter 1 to 2 cm.

2. Determine the pitch and least count of the given screw gauge and measure the mean radius of the given wire, taking three sets of readings in perpendicular directions.

3. Measure the length, breadth and thickness of a glass block using a metre rule (each reading correct to a mm), taking the mean of three readings in each case. Calculate the volume of the block in cm^{3} and m^{3} . Determine the mass (not weight) of the block using any convenient balance in g and kg. Calculate the density of glass in cgs and SI units using mass and volume in the respective units. Obtain the relation between the two density units.

4. Measure the volume of a metal bob (the one used in simple pendulum experiments) from the readings of water level in a measuring cylinder using displacement method. Also, calculate the same volume from the radius measured using Vernier callipers. Comment on the accuracies.

5. Obtain five sets of readings of the time taken for 20 oscillations of a simple pendulum of lengths about 70, 80, 90, 100 and 110 cm; calculate the time periods (T) and their squares (T^{2} ) for each length (l). Plot a graph of l vs. T^{2} . Draw the best – fit straight – line graph. Also, obtain its slope. Calculate the value of g in the laboratory. It is 4π2 x slope.

6. Take a beaker of water. Place it on the wire gauze on a tripod stand. Suspend two thermometers – one with Celsius and the other with Fahrenheit scale. Record the thermometer readings at 5 to 7 different temperatures. You may start with ice cold water, then allow it to warm up and then heat it slowly taking temperature (at regular intervals) as high as possible. Plot a graph of T_{F} vs. T_{c}. Obtain the slope. Compare with the theoretical value. Read the intercept on T_{F} axis for T_{C} = 0.

7. Using a plane mirror strip mounted vertically on a board, obtain the reflected rays for three rays incident at different angles. Measure the angles of incidence and angles of reflection. See if these angles are equal.

8. Place three object pins at different distances on a line perpendicular to a plane mirror fixed vertically on a board. Obtain two reflected rays (for each pin) fixing two pins in line with the image. Obtain the positions of the images in each case by extending backwards (using dashed lines), the lines representing reflected rays. Measure the object distances and image distances in the three cases. Tabulate. Are they equal? Generalize the result.

9. Obtain the focal length of a concave mirror (a) by distant object method, focusing its real image on a screen or wall and (b) by one needle method removing parallax or focusing the image of the illuminated wire gauze attached to a ray box. One could also improvise with a candle and a screen. Enter your observations in numbered rows.

10. Connect a suitable dc source (two dry cells or an acid cell), a key and a bulb (may be a small one used in torches) in series. Close the circuit by inserting the plug in the key. Observe the bulb as it lights up. Now open the circuit, connect another identical bulb in between the first bulb and the cell so that the two bulbs are in series. Close the key. Observe the lighted bulbs. How does the light from any one bulb compare with that in the first case when you had only one bulb? Disconnect the second bulb. Reconnect the circuit as in the first experiment. Now connect the second bulb across the first bulb. The two bulbs are connected in parallel. Observe the brightness of any one bulb. Compare with previous results. Draw your own conclusions regarding the current and resistance in the three cases.

11. Plot the magnetic field lines of earth (without any magnet nearby) using a small compass needle. On another sheet of paper place a bar magnet with its axis parallel to the magnetic lines of the earth, i.e. along the magnetic meridian or magnetic north south. Plot the magnetic field in the region around the magnet. Identify the regions where the combined magnetic field of the magnet and the earth is (a) strongest, (b) very weak but not zero, and (c) zero. Why is neutral point, so called?

12. Using a spring balance obtain the weight (in N) of a metal ball in air and then completely immersed in water in a measuring cylinder. Note the volume of the ball from the volume of the water displaced. Calculate the upthrust from the first two weights. Also calculate the mass and then the weight of the water displaced by the bob M=V.ρ, W=mg). Use the above result to verify Archimedes principle.

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