Q1) Why do we need to group objects? Give three reasons.
Q2 a) Why is water called universal solvent?
b) Explain why the electricians wear rubber gloves while repairing
electrical appliances.
Q3) Name and define three types of motion with one example of each.
Q4) How will you measure the length of a curve thread? Explain it with the
help of a diagram.
Q5 a) What is shadow? How is it formed?
b) Write two essential conditions for the formation of shadow.
Q6) Write three differences between luminous and non luminous objects.
Q7) Draw a well labelled diagram of a pinhole camera. plz answer as much you cab
Answers
Answer:
1 materials are grouped together on the basis of similarities and differences in their properties . materials are grouped together for convenience and to study their properties. grouping of material saves our time , energy and makes our study easier .
2
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. ... This allows the water molecule to become attracted to many other different types of molecules
2bAs rubber is a bad conductor of electricity so it does not allow the electric current to pass through it. Thus, the rubber gloves will save the electrician from any electric shock while repairing an electric switch or appliance.
3There are different types of motion: translational, rotational, periodic, and non periodic motion. A type of motion in which all parts of an object move the same distance in a given time is called translational motion. Examples are vehicles moving on a road, a child going down a bird flying in the sky.
Answer:
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