There are several practical experiments and field trips suggested in the NCERT SST (Social Science) textbook for Class 4. These activities are designed to enhance the learning experience of the students and provide them with hands-on learning opportunities. Here are some of the suggested practical experiments and field trips:

1. Experiment - Making a Compass:
Students can conduct an experiment to make a compass using a magnet, a cork, and a bowl of water. They can observe how the needle aligns itself with the Earth's magnetic field and points towards the north.

2. Experiment - Understanding Soil Types:
Students can collect soil samples from different areas and classify them based on their texture, color, and ability to hold water. This experiment helps them understand the different types of soil and their properties.

3. Field Trip - Visit to a Local Market:
Students can go on a field trip to a local market to understand the concept of buying and selling goods. They can observe different types of shops, interact with shopkeepers, and learn about the importance of money in the economy.

4. Field Trip - Visit to a Post Office:
A visit to a post office can be organized to introduce students to the postal system. They can learn about the process of sending and receiving letters, the role of postal workers, and the importance of addressing and stamping envelopes.

5. Experiment - Understanding Water Pollution:
Students can conduct an experiment to understand the concept of water pollution. They can collect water samples from different sources, such as a river, pond, and tap, and observe the differences in their clarity and cleanliness. This experiment helps them understand the importance of clean water and the impact of pollution.

6. Field Trip - Visit to a Historical Monument:
A field trip to a historical monument can be organized to give students a firsthand experience of the past. They can explore the architecture, learn about the historical significance, and understand the cultural heritage associated with the monument.

These practical experiments and field trips not only make the learning process more engaging and interactive but also help students develop a deeper understanding of the concepts taught in the textbook. They provide real-life examples and experiences that enhance their knowledge and make the subject more relatable.