Samacheer Kalvi Class 5 Maths Solutions Term 3 Chapter 3 Measurements InText Questions

Activity 2 (Text Book Page N0.24)

Question. Take some water in a beaker and mark its level. Take a solid, that is, potato and immerse it in the beaker containing water. What do you observe?Answer: When a solid object like a potato is placed in water, the water level rises. This happens because the potato takes up space, pushing the water upwards.
In simple words: The water level in the beaker goes up because the potato takes up space inside the water.

🎯 Exam Tip: Remember that any object submerged in a liquid displaces a volume of liquid equal to its own volume, causing the liquid level to rise.

Activity 4 (Text Book Page N0.26)

Question. We shall follow the method of unit cubes to calculate or find the volume of the objects given below. The dimensions of the objects are mentioned. Find the volume of the book and the pencil box using unit cubes.
Answer: To find the volume of the book, we multiply its length (10 units), width (6 units), and height (1 unit). So, \( 10 \times 6 \times 1 = 60 \) unit cubes.
For the pencil box, we multiply its length (6 units), width (2 units), and height (1 unit). So, \( 6 \times 2 \times 1 = 12 \) unit cubes. Volume is the amount of three-dimensional space an object occupies.
In simple words: We calculate volume by multiplying length, width, and height. The book's volume is 60 unit cubes, and the pencil box's volume is 12 unit cubes.

🎯 Exam Tip: Always remember the formula for the volume of a rectangular prism: Volume = Length × Width × Height. Ensure all dimensions are in the same unit before multiplying.