CBSE Class 4 EVS How Things Work Worksheet Set 01

Fill in the Blanks

Question. A ________ is a device designed to investigate spinning movements, like a top or various handmade spinners.
Answer: Spinner
Explanation: A device is just another word for a tool or machine we use to do something.

Question. A ________ is a traditional Indian spinning top made from wood or clay.
Answer: Lattu
Explanation: Traditionally means something people have made and played with for many, many years in our culture.

Question. ________ is a classic wheel for turning cotton into thread, famously used by Mahatma Gandhi.
Answer: Charkha
Explanation: A classic item is something that is very old, famous, and important in history.

Question. The ability of an object to stay on the surface of water is called ________.
Answer: Float
Explanation: When something stays on top of the water instead of going to the bottom, we say it floats.

Question. Objects that are ________ are packed closely and heavy for their size.
Answer: Dense
Explanation: Heavy things that have lots of material packed closely together inside them are dense.

Short Question Answers

Question. What happens when a coin spins?
Answer: When a coin spins, it slowly loses speed, wobbles, and stops because it loses balance.
Explanation: Wobbles means it shakes or moves unsteadily from side to side before it falls flat.

Question. Why does a square spinner look circular when spun quickly?
Answer: A square spinner looks circular when spun fast because the edges blur, making it look round.
Explanation: Blurring happens when things move so fast that our eyes can't see their sharp corners anymore.

Question. What decides whether an object floats or sinks?
Answer: The shape of an object decides if it floats or sinks. A good shape that traps air helps it float.
Explanation: Decides means it plays the main role in making something happen.

Question. How does the charkha work and what is its importance?
Answer: A charkha is a spinning wheel used to twist cotton fiber into yarn. It has a big wheel that turns by hand. Mahatma Gandhi used it to promote self-reliance.
Explanation: Yarn is another word for the long threads used to weave cloth.

Question. What are some examples of objects that float and sink?
Answer: Examples of things that float are thermocol, cork, and foam. Examples of things that sink are marbles, coins, and iron nails.
Explanation: Light things with trapped air usually float, while heavy, solid things sink.

Vocabulary Activity - "Guess the Word"

Question. A sharp or spicy taste, like that of green chilli.
Answer: Pungent
Explanation: Pungent is a special word for a very strong, sharp taste or smell that tingles your nose or tongue.

Question. The way food feels in the mouth, like whether it is smooth or crunchy.
Answer: Texture
Explanation: Texture is how something feels when you touch it or chew it.

Question. The act of something staying on the surface of water.
Answer: Float
Explanation: Floating is staying up on top of a liquid instead of sinking down.

Question. A heavy object tightly packed for its size.
Answer: Dense
Explanation: Density is how tightly all the tiny parts of an object are packed together.

Question. A traditional Indian spinning top made from wood or clay.
Answer: Lattu
Explanation: A lattu is a fun toy that spins around very fast on a sharp point.