The Wonderful World of ScienceClass 6 Science NCERT Solutions
5 Solutions
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Solution 1 of 5
Q1Activity 1.1: Let us think and write
Write about a similar problem that you tried to solve.
Solution
One similar problem I tried to solve was when my bicycle chain kept coming off.
Problem: My bicycle chain keeps coming off while riding.
Observation: The chain frequently detaches from the gears, especially when I pedal hard.
Q2Activity 1.1: Let us think and write
What steps did you take?
Solution
I followed these steps to solve the problem of my bicycle chain coming off:
- Observe: The chain comes off often, making it difficult to ride.
- Ask a Question: Why does the bicycle chain keep coming off?
- Guess (Hypothesis): Maybe the chain is too loose or the gears are dirty.
- Test: First, I checked the chain tension. It seemed a bit loose. I tried tightening it slightly. Then, I cleaned the gears and applied some lubricant to the chain.
- Analyze Results: After tightening the chain and cleaning the gears, the chain did not come off as frequently. This suggested that a loose chain and dirty gears were contributing factors to the problem.
Q1Activity 1.2: Let us think and write
Describe a daily life situation where you think someone was following a scientific method.
Solution
A daily life situation where someone follows a scientific method is when a parent tries to figure out why their baby is crying.
- Observe: The baby is crying loudly.
- Ask a Question: Why is the baby crying?
- Guess (Hypothesis): Maybe the baby is hungry.
- Test: The parent offers a bottle or breastfeed.
- Analyze Results: If the baby stops crying and feeds, the guess was correct. If the baby continues to cry, the parent makes another guess (e.g., maybe the diaper is wet, or the baby is sleepy) and tests it, continuing until the cause of crying is identified and resolved. This iterative process of observation, questioning, hypothesizing, testing, and analyzing is a clear application of the scientific method.
Q1Activity 1.3: Let us think and write
If you have to ask "Why?" about something, what would you ask about?
Solution
If I had to ask 'Why?' about something, I would ask: Why do some objects float on water while others sink?
Q2Activity 1.3: Let us think and write
Try to write down how you would attempt to find an answer to your question.
Solution
To find an answer to why some objects float and others sink, I would attempt the following:
- Observe: Place various objects (e.g., a stone, a leaf, a coin, a piece of wood, a plastic toy) into a tub of water and observe whether they float or sink.
- Ask a Question: What properties of these objects determine if they float or sink?
- Guess (Hypothesis): Perhaps it has something to do with how heavy the object is compared to its size, or what material it is made of.
- Test:
- Compare objects of similar size but different materials (e.g., a small pebble and a small piece of wood).
- Compare objects of the same material but different sizes (e.g., a small and a large stone).
- Observe if the shape of the object matters (e.g., a flat sheet of aluminum foil versus a crumpled ball of the same foil).
- Analyze Results: I would notice that lightweight materials like wood and plastic often float, while denser materials like stone and metal usually sink. The shape also plays a role, as a boat-shaped object made of metal can float, while a solid block of the same metal would sink. This would lead me to understand that it is not just about weight, but about density (how much mass is packed into a given volume) and how much water an object displaces.