CBSE Class 4 EVS Going To School NCERT Solutions

To answer this question, you need to perform the activity described. Lay several bricks in a straight line on the ground, leaving a small gap between them. Now, try to walk along the line of bricks, stepping from one brick to the next.

When you walk on bricks laid flat on the ground, it feels relatively easy because the surface is stable and provides a good base for your feet. The bricks are at ground level, so there is no significant height to balance at.

Answer: Yes, it was easy.

This question asks about your personal experience after performing the activity. First, with the help of your teacher, tie 4 or 5 bamboo poles together securely to create a makeshift bridge. Carefully try to walk across this bamboo bridge.

Walking on a bridge made of tied bamboo poles can be a bit wobbly and requires concentration. You might feel nervous or scared because the bridge is not as stable as a solid path. It's important to maintain your balance.

How did you feel? Most students might feel scared or a little nervous while walking on such a bridge for the first time.

Did you fall down? It is possible to fall if you lose your balance, but with careful steps and concentration, you might be able to cross without falling. However, it could still be a bit difficult to keep your balance perfectly.

Answer: I felt a bit scared. No, I did not fall down, but it was a bit difficult to maintain my balance.

Consider the surface of the bamboo bridge and how your feet interact with it. When you wear shoes or slippers, the soles are often smooth and might not grip the bamboo poles very well, especially if they are slightly wet or uneven.

Walking barefoot allows your toes to spread out and grip the surface of the bamboo poles more effectively. This increased grip can provide better stability and make it easier to balance while walking across the bridge.

Answer: I think it would be easier to walk on this bridge barefoot because the toes can grip the bamboo poles better, providing more stability and reducing the chance of slipping.

Look closely at the two pictures provided, which show how buckets are being pulled out of a well.

In the first picture, the bucket of water is being pulled directly upwards using a rope tied to it. This requires pulling with significant force directly against gravity.

In the second picture, there is a wheel (pulley) fixed at the top of the well. The rope passes over this wheel. When the rope is pulled downwards, the bucket is lifted upwards. This arrangement uses a pulley system.

Answer: The difference is that in the first picture, the bucket is pulled directly up using only a rope, while in the second picture, a pulley is used along with the rope to lift the bucket from the well.

A pulley is a simple machine designed to make work easier. When you pull a rope attached to a bucket without a pulley, you are lifting the entire weight of the bucket and water directly upwards. This requires a lot of force.

When a pulley is used, the rope goes over a wheel. This often allows you to pull the rope downwards, which can feel easier than pulling upwards, and it can also help distribute the weight or change the direction of the force needed. Therefore, using a pulley generally reduces the effort required to lift heavy objects.

Answer: It is easier to lift things using a pulley.

Pulleys are used in many places to make lifting and moving heavy things easier. Think about places where heavy items are lifted or where ropes are used with wheels.

Common examples include:

• Construction sites: To lift building materials like bricks and cement bags.
• Flagpoles: To raise and lower the flag.
• Wells: To draw water up.
• Cranes: Used in factories or for lifting heavy loads.
• Window blinds or curtains: Some systems use pulleys.
• Elevators: In buildings, pulley systems help move the elevator car.

Answer: I see pulleys being used at construction sites for lifting heavy materials, on flagpoles to hoist flags, in wells to draw water, and in some elevators and cranes.

The question refers to a bridge likely made of cement or concrete, as seen in the accompanying picture (though not provided here). Let's compare it to a bamboo bridge.

A bamboo bridge is typically made by tying bamboo poles together. It is often narrow, less sturdy, and can be slippery or uneven. It might not be suitable for heavy loads or large numbers of people.

A cement bridge, on the other hand, is constructed using strong materials like cement, concrete, and steel. It is usually much wider, very strong, and built to last for a long time (durable). These bridges can support many people and vehicles simultaneously.

Answer: A cement bridge is different from a bamboo bridge because it is much wider, stronger, and more durable. Bamboo bridges are often narrower and less sturdy.

This question relates to the cement bridge mentioned previously. Considering that cement bridges are built to be wide and strong, they are designed to accommodate multiple users simultaneously.

A typical cement bridge, especially one shown in educational contexts for Class 4, is usually wide enough for several people to walk side-by-side or in a line without crowding. It can easily support the weight of many people crossing at the same time.

Answer: More than twenty people can cross such a bridge at one time, as it is designed to be wide and strong.

This question asks for your personal preference based on the characteristics of different bridges discussed. We have learned about bamboo bridges and cement bridges.

Bamboo bridges can be challenging and sometimes scary to cross due to their instability. Cement bridges are generally wide, strong, and provide a stable, safe surface to walk on.

Therefore, most people would prefer the safer and easier option.

Answer: I would like to use a bridge made of cement because it is more safe, stable, and easy to cross compared to a bamboo bridge.

This question requires you to think about your own route to school. Reflect on whether your journey involves crossing any rivers, streams, or other obstacles that require a bridge.

If you do cross a bridge, try to describe what it is made of (e.g., cement, wood, metal, rope) and what it looks like (e.g., wide, narrow, long, short). If you do not cross a bridge on your way to school, you can mention that and perhaps describe bridges you have seen elsewhere, like in your city or town.

Answer: There is no bridge on the way to my school. However, I often cross several strong cement bridges in my city when I travel.

This is an activity that involves talking to your elders, like your grandparents. Ask them about the bridges that existed when they were children or young adults. They might remember different types of bridges than what is common today, or perhaps older versions of current bridges.

For example, they might talk about simple wooden bridges, rope bridges, or older, perhaps less sturdy, stone or brick bridges. They could also tell you about how people used to travel before modern bridges were built.

Answer: My grandparents told me that when they were young, there were fewer cement bridges. They used to cross simple wooden bridges and sometimes even had to use boats or ferries where bridges were not built.